CN111875903B - Metal color refrigerator door seal rubber sleeve composite material and preparation method thereof - Google Patents
Metal color refrigerator door seal rubber sleeve composite material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/08—Parts formed wholly or mainly of plastics materials
- F25D23/082—Strips
- F25D23/087—Sealing strips
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- C08L2207/04—Thermoplastic elastomer
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Abstract
The invention discloses a metallic refrigerator door seal gum cover composite material and a preparation method thereof, wherein the metallic refrigerator door seal gum cover composite material consists of PVC resin, a plasticizer, an elastomer, a stabilizer, a lubricant, a filler, an antibacterial mildew preventive and metal highlight powder, and the preparation method of the metallic refrigerator door seal gum cover composite material comprises the following steps: weighing; mixing and heating to prepare a material; granulating; and (5) extruding and molding the rubber sleeve. The invention solves the problems of monotonous color of the common door seal rubber sleeve, large contrast with the color between the side plate panel of the refrigerator door in contact and poor overall harmony, simultaneously increases the surface strength of the refrigerator door seal rubber sleeve, eliminates the phenomenon that the surface of the rubber sleeve is easy to scratch, improves the elastic modulus of the rubber sleeve material, reduces the deformation degree of the common rubber sleeve, ensures that the refrigerator has good overall sealing performance, improves the processing fluidity of the granules of the material, and reduces the rejection rate of the material in the process of manufacturing the refrigerator door seal.
Description
Technical Field
The invention relates to the field of refrigerator door seal rubber sleeve composite materials and preparation methods thereof, and particularly belongs to a metal-color refrigerator door seal rubber sleeve composite material and a preparation method thereof.
Background
At present, the refrigerator door seals used in the household refrigerator market are mostly made of polyvinyl chloride (PVC) materials which are all common three colors of grey, white and black, the colors are monotonous, the contrast of the colors between the refrigerator door seals and refrigerator door side plate panels in contact is large, and the overall harmony is poor. With the improvement of living standard of people, more and more young people not only pursue the quality of products, but also have higher and higher requirements on the appearance of the products, and the refrigerator door seal with monotonous color and poor integral color harmony can not meet the actual requirements of the young people on pursuing the appearance of the products.
Meanwhile, a common polyvinyl chloride (PVC) material is adopted, the material has poor granule processing fluidity in the process of extruding and processing the refrigerator door seal rubber sleeve, and the refrigerator door seal rubber sleeve made of the material is easy to deform in the process of manufacturing the refrigerator door seal, so that the rejection rate is high; the refrigerator door sealing rubber sleeve made of the material has poor surface strength, and the surface of the rubber sleeve is easily scratched; after the finished product of the refrigerator door seal is manufactured by penetrating magnetic stripes in the rubber sleeve and welding, the rubber sleeve has large deformation degree due to small overall elastic modulus of the rubber sleeve material, so that the sealing performance between the side plate and the box body of the refrigerator door is poor; in addition, the metal powder pigment is directly added into the common polyvinyl chloride (PVC) material, so that the problems of uneven dispersion and easy powder falling are easily caused. Therefore, a metallic refrigerator door seal rubber sleeve composite material and a preparation method thereof are developed to solve the problems.
Disclosure of Invention
The invention aims to provide a metallic refrigerator door seal rubber sleeve composite material and a preparation method thereof, which can solve the problems in the background technology. Is suitable for being popularized and used in the manufacture of refrigerator door sealing sleeves.
The technical scheme adopted by the invention is as follows:
a metallic composite material for the sealing rubber sleeve of refrigerator door is composed of metallic high-lustre powder.
Further, the metal highlight powder is a nano-scale metal powder mixture, and the metal highlight powder is composed of mica particles, metal powder and a titanate coupling agent, wherein the content of the titanate coupling agent in the metal highlight powder accounts for 1-2% of the weight of the metal highlight powder.
Further, the metallic refrigerator door seal rubber sleeve composite material is composed of PVC resin, a plasticizer, an elastomer, a stabilizer, a lubricant, an antibacterial mildew preventive and metal highlight powder, wherein the weight parts of the components are as follows:
100 parts of PVC resin, 50-90 parts of plasticizer, 5-20 parts of elastomer, 0-60 parts of filler, 1-5 parts of stabilizer, 0.2-1 part of lubricant, 0.2-2 parts of antibacterial mildew preventive and 1-10 parts of metal highlight powder;
wherein the unit of weight is gram, the PVC resin is a polar non-crystalline polymer, the PVC resin is compounded and mixed with one or more of polyvinyl chloride resins with the average polymerization degree of 800, 1000 and 1300, the plasticizer is an ester polymerized by adipic acid and polyester polyol, and is compounded with one or more of trioctyl trimellitate, dioctyl terephthalate, dioctyl sebacate, cyclohexane 1, 2-diisononyl phthalate, dioctyl adipate and epoxidized soybean oil, the elastomer is one or more of thermoplastic polyurethane elastomer TPU, nitrile rubber P83 and ethylene-vinyl acetate copolymer EVA, the filler is calcium carbonate particles with the particle size of 6.5-15 um, the stabilizer is zinc stearate, calcium stearate, hydrotalcite, pentaerythritol, phosphite ester and beta-diketone, 1076 antioxidant, the said lubricant is one or more of stearic acid, paraffin wax and PE wax, the said antibiotic mildew preventive is one or more of 4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT, low yellowing pyridine zinc sulfate ZPT, water soluble N-octyl isothiazolinone OIT, the said metal high gloss powder is mixed and compounded by adding 1% -2% titanate coupling agent of the part by mass of mica.
Further, the PVC resin is manufactured by Taiwan plastic industry Co., Ltd, and has a model number of S-60/S-65/S-70; adipic acid in the plasticizer is produced by Zhengzhou Xintian and chemical products Co., Ltd, polyester polyol in the plasticizer is produced by Nanjing banuo biological technology Co., Ltd, dioctyl terephthalate in the plasticizer is produced by blue Sail chemical Co., Ltd, trioctyl trimellitate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, epoxidized soybean oil in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, cyclohexane 1, 2-diisononyl phthalate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, dioctyl sebacate in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, dioctyl adipate in the plasticizer is produced by Co-formed chemical industry Co., Ltd;
the thermoplastic polyurethane elastomer TPU in the elastomer is produced by Baoli Wei plastics Limited, Shenzhen, the nitrile rubber P83 in the elastomer is produced by Shanghai Liangdian chemicals Limited, and the ethylene-vinyl acetate copolymer EVA in the elastomer is produced by Shanghai Yan quasi-biotechnology Limited;
the calcium carbonate is produced by Jiangxi Guangyi chemical industry, Inc.;
the stabilizer is a lead-free calcium zinc stabilizer produced by Huizhou brocade source plasticizing materials, Inc.;
the stearic acid in the lubricant is produced by eastern palm industry limited company in a model of VA-1865, the paraffin in the lubricant is produced by China Petroleum-smoothing petrochemical company in a model of 58, and the PE wax in the lubricant is produced by Jiangxi Macro-Yuan chemical industry limited company in a model of PE-2;
4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City, low-yellowing pyridine zinc sulfate ZPT in the antibacterial mildew preventive is produced by the Ahaole mildew-proof antibacterial science and technology Limited in Guangzhou, and water-soluble N-octyl isothiazolinone OIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City.
The preparation method of the metal-color refrigerator door seal rubber sleeve composite material comprises the following specific steps:
the method comprises the following steps: weighing: accurately weighing the relevant components in the metal highlight powder according to the weight part of claim 2 and other components according to the weight part range in claim 3;
step two: first-stage low-speed mixing: adding nanoscale metal powder and titanate coupling agent which accounts for 1-2% of the weight of the nanoscale metal powder into the high-speed mixing pot through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, raising the temperature of the high-speed mixing pot, fully mixing the coupling agent and the metal powder after the high-speed mixing pot is heated to 100-110 ℃ and mixed at low speed for 30min, discharging from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for later use;
mixing materials in a second stage: adding the PVC resin, the stabilizer, the lubricant and the antibacterial and mildewproof agent which are accurately weighed according to the claim 3 into a high-speed mixing pot for secondary mixing at normal temperature through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, and fully mixing the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent after mixing at low speed for 1-3 min;
third-stage material mixing: heating the plasticizer accurately weighed according to claim 3 to 40 ℃, putting the plasticizer into a plasticizer storage barrel or a high-speed mixing kettle barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, and feeding into a low-speed mixing cold mixing pot until the cold mixing temperature reaches 50 ℃, and discharging to obtain dry and uniform mixed powder;
step three: and (3) granulation: extruding and granulating the mixed powder by adopting a double-screw extruder, setting the temperature parameters of a first area to an eighth area of a screw of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be: the temperature of the ninth zone is 100-130 ℃, the temperature of the tenth zone is 100-140 ℃, the temperature of the eleventh zone is 100-140 ℃, the temperature of the twelfth zone is 100-150 ℃, the temperature of the head is 140-170 ℃, the temperature of the melt is 135-170 ℃, the rotating speed of the main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized into a mass, the temperature near the hopper of the double-screw extruder is the lowest, then the temperature is gradually increased, the temperature of the die at the rear end of the double-screw extruder is the highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture particle material;
step four: and (3) extrusion molding of the rubber sleeve: and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃ and a host frequency of 30-50 HZ, cooling the mixture granules in a cold water tank after the mixture granules are discharged from the single-screw extruder, and cutting the mixture granules when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door sealing rubber sleeve.
Compared with the prior art, the invention has the following beneficial effects:
compared with the prior art, the invention solves the problems of monotonous color of the common door sealing rubber sleeve, large color contrast with the side plate panel of the refrigerator door in contact and poor overall harmony, and solves the problems of uneven dispersion and easy powder falling of metal powder pigment easily caused by directly adding the metal powder pigment into the common polyvinyl chloride (PVC) material; meanwhile, the surface strength of the refrigerator door seal rubber sleeve is increased, the phenomenon that the surface of the rubber sleeve is easily scratched is eliminated, the elastic modulus of a rubber sleeve material is improved, the deformation degree of a common rubber sleeve is reduced, the overall sealing performance of a refrigerator is good, the processing flowability of granules of the material is improved, and the rejection rate of the material in the process of manufacturing the refrigerator door seal is reduced.
Drawings
FIG. 1 is a metallographic photograph of a refrigerator door seal rubber sleeve made of a common PVC material, with a longitudinal vertical section enlarged by 100 times;
FIG. 2 is a metallographic photograph of a refrigerator door seal rubber sleeve manufactured according to the formula of the first embodiment, magnified by 100 times in longitudinal vertical section;
FIG. 3 is a metallographic photograph taken at 100 times magnification of the longitudinal vertical cross section of a refrigerator door seal rubber sleeve manufactured according to the formulation of example two;
FIG. 4 is a metallographic photograph taken at 100 times magnification of the longitudinal vertical section of a refrigerator door seal rubber sleeve manufactured according to the third formulation of the example;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with specific embodiments, and the technical solutions in the embodiments of the present invention are clearly and completely described. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to examples and specific embodiments.
A metallic composite material for the sealing rubber sleeve of refrigerator door is composed of metallic high-lustre powder.
Further, the metal highlight powder is a nano-scale metal powder mixture, and the metal highlight powder is composed of mica particles, metal powder and a titanate coupling agent, wherein the content of the titanate coupling agent in the metal highlight powder accounts for 1-2% of the weight of the metal highlight powder.
Further, the metallic refrigerator door sealing rubber sleeve composite material is composed of PVC resin, a plasticizer, an elastomer, a stabilizer, a lubricant, an antibacterial mildew preventive and metal highlight powder, wherein the added parts by weight of the components are as follows:
100 parts of PVC resin, 50-90 parts of plasticizer, 5-20 parts of elastomer, 0-60 parts of filler, 1-5 parts of stabilizer, 0.2-1 part of lubricant, 0.2-2 parts of antibacterial mildew preventive and 1-10 parts of metal highlight powder;
wherein the unit of weight is gram, the PVC resin is a polar non-crystalline polymer, the PVC resin is compounded and mixed with one or more of polyvinyl chloride resins with the average polymerization degree of 800, 1000 and 1300, the plasticizer is an ester polymerized by adipic acid and polyester polyol, and is compounded with one or more of trioctyl trimellitate, dioctyl terephthalate, dioctyl sebacate, cyclohexane 1, 2-diisononyl phthalate, dioctyl adipate and epoxidized soybean oil, the elastomer is one or more of thermoplastic polyurethane elastomer TPU, nitrile rubber P83 and ethylene-vinyl acetate copolymer EVA, the filler is calcium carbonate particles with the particle size of 6.5-15 um, the stabilizer is zinc stearate, calcium stearate, hydrotalcite, pentaerythritol, phosphite ester and beta-diketone, 1076 the antioxidant is prepared by compounding two or more of antioxidants, the lubricant is one or more of stearic acid, paraffin and PE wax, the antibacterial and antifungal agent is one or more of 4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT, low-yellowing zinc pyridine sulfate ZPT and water-soluble N-octyl isothiazolinone OIT, and the metal highlight powder is prepared by mixing mica with 1-2% by mass of titanate coupling agent.
Further, the PVC resin is manufactured by Taiwan plastic industry Co., Ltd, and has a model number of S-60/S-65/S-70; adipic acid in the plasticizer is produced by Zhengzhou Xintian and chemical products Co., Ltd, polyester polyol in the plasticizer is produced by Nanjing banuo biological technology Co., Ltd, dioctyl terephthalate in the plasticizer is produced by blue Sail chemical Co., Ltd, trioctyl trimellitate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, epoxidized soybean oil in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, cyclohexane 1, 2-diisononyl phthalate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, dioctyl sebacate in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, dioctyl adipate in the plasticizer is produced by Co-formed chemical industry Co., Ltd;
the thermoplastic polyurethane elastomer TPU in the elastomer is produced by Baoli Wei plastics Limited, Shenzhen, the nitrile rubber P83 in the elastomer is produced by Shanghai Liangdian chemicals Limited, and the ethylene-vinyl acetate copolymer EVA in the elastomer is produced by Shanghai Yan quasi-biotechnology Limited;
the calcium carbonate is produced by Jiangxi Guangyi chemical industry, Inc.;
the stabilizer is a lead-free calcium zinc stabilizer produced by Huizhou brocade source plasticized material Co., Ltd;
the stearic acid in the lubricant is produced by eastern palm industry limited company in a model of VA-1865, the paraffin in the lubricant is produced by China Petroleum-smoothing petrochemical company in a model of 58, and the PE wax in the lubricant is produced by Jiangxi Macro-Yuan chemical industry limited company in a model of PE-2;
4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City, low-yellowing pyridine zinc sulfate ZPT in the antibacterial mildew preventive is produced by the Ahaole mildew-proof antibacterial science and technology Limited in Guangzhou, and water-soluble N-octyl isothiazolinone OIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City.
The preparation method of the metal-color refrigerator door seal rubber sleeve composite material comprises the following specific steps:
the method comprises the following steps: weighing: accurately weighing the relevant components in the metal highlight powder according to the weight part of claim 2 and other components according to the weight part range in claim 3;
step two: first-stage low-speed mixing: adding nanoscale metal powder and titanate coupling agent which accounts for 1-2% of the weight of the nanoscale metal powder into the high-speed mixing pot through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, raising the temperature of the high-speed mixing pot, fully mixing the coupling agent and the metal powder after the high-speed mixing pot is heated to 100-110 ℃ and mixed at low speed for 30min, discharging from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for later use;
and (3) secondary material mixing: adding the PVC resin, the stabilizer, the lubricant and the antibacterial and mildewproof agent which are accurately weighed according to the claim 3 into a high-speed mixing pot for secondary mixing at normal temperature through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, and fully mixing the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent after mixing at low speed for 1-3 min;
third-stage material mixing: heating the plasticizer accurately weighed according to claim 3 to 40 ℃, putting the plasticizer into a plasticizer storage barrel or a high-speed mixing kettle barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, entering a low-speed mixing cold mixing pot, and discharging until the cold mixing temperature reaches 50 ℃ to obtain dry and uniform mixed powder;
step three: and (3) granulation: extruding and granulating the mixed powder by adopting a double-screw extruder, setting the temperature parameters of a first area to an eighth area of a screw of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be: the temperature of the ninth zone is 100-130 ℃, the temperature of the tenth zone is 100-140 ℃, the temperature of the eleventh zone is 100-140 ℃, the temperature of the twelfth zone is 100-150 ℃, the temperature of the machine head is 140-170 ℃, the temperature of the melt is 135-170 ℃, the rotating speed of the main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized into lumps, the temperature near the hopper of the double-screw extruder is the lowest, then the temperature is gradually increased, the temperature at the neck ring at the rear end of the double-screw extruder is the highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture granule;
step four: and (3) extrusion molding of the rubber sleeve: and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃ and a host frequency of 30-50 HZ, cooling the mixture granules in a cold water tank after the mixture granules are discharged from the single-screw extruder, and cutting the mixture granules when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door sealing rubber sleeve.
The first embodiment is as follows:
the sealing rubber sleeve material of the refrigerator door is accurately weighed according to the following parts:
100 parts of PVC resin, 50-90 parts of plasticizer, 5-20 parts of elastomer, 0-60 parts of filler, 1-5 parts of stabilizer, 0.2-1 part of lubricant, 0.2-2 parts of antibacterial mildew preventive and 1-10 parts of metal highlight powder, wherein the unit of weight is gram,
adding nanoscale metal powder, which is a related component in accurately weighed metal highlight powder, and a titanate coupling agent accounting for 1-2% of the weight of the nanoscale metal powder into a high-speed mixing pot through a high-speed mixing machine charging barrel, raising the temperature of the high-speed mixing pot, mixing the nanoscale metal powder and the titanate coupling agent at a low speed for 30min when the temperature of the high-speed mixing pot is raised to 100-110 ℃, fully mixing the nanoscale metal powder and the titanate coupling agent, discharging the mixture from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for subsequent use (first-stage mixing);
adding the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent which are weighed accurately according to the parts by weight in the first embodiment into a high-speed mixing pot for secondary mixing at normal temperature through a charging barrel of the high-speed mixing pot, and mixing at low speed for 1-3 min to fully mix the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent (secondary mixing);
the plasticizer which is accurately weighed according to the weight portion in the first embodiment is heated to 40 ℃, and is completely put into a plasticizer storage barrel or a high-speed mixing pot charging barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, entering a low-speed mixing cold mixing pot, and discharging until the cold mixing temperature reaches 50 ℃ to obtain dry and uniform mixed powder (third-stage mixed material);
extruding and granulating the mixed powder by using a double-screw extruder, setting the temperature parameters of a first area to a second area of screws of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be as follows: the temperature of the ninth zone is 100 ℃, the temperature of the tenth zone is 110 ℃, the temperature of the eleventh zone is 130 ℃, the temperature of the twelfth zone is 150 ℃, the temperature of a machine head is 170 ℃, the temperature of a melt is 135-170 ℃, the rotating speed of a main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized and agglomerated, the temperature near a hopper of the double-screw extruder is lowest, then the temperature is gradually increased, the temperature of a neck mold at the rear end of the double-screw extruder is highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture granule;
and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃, a host frequency of 30-50 HZ and a host rotation speed of 150 r/min, discharging the mixture from the single-screw extruder, cooling the mixture in a cold water tank, and cutting when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door seal rubber sleeve.
Then cutting, penetrating magnetism and heat welding are carried out to obtain a complete finished product of the refrigerator door seal.
The metal highlight powder in the refrigerator door seal rubber sleeve prepared by the formula and the process can eliminate the migration of the plasticizer to the surface of the door seal rubber sleeve, promote the melting of materials, reduce the viscosity and the processing temperature of a melt and improve the processing speed; meanwhile, the nanoscale metal powder in the metal highlight powder can partially migrate to the surface of the refrigerator door seal rubber sleeve product, so that the surface of the product is in a metal color, the mechanical property of the material is integrally improved, the surface strength of the door seal rubber sleeve is increased, and the surface of the refrigerator door seal rubber sleeve is not easily scratched; the material has good granule processing fluidity, and the refrigerator door sealing rubber sleeve made of the material is not easy to crack, thereby effectively reducing the rejection rate of products.
Compared with the common refrigerator door seal rubber sleeve PVC material, the material solves the problems of monotonous color of the common door seal rubber sleeve, large color contrast with a side plate panel of a refrigerator door in contact and poor overall harmony, and solves the problems that the metal powder pigment is easily dispersed unevenly and falls off due to the direct addition of the metal powder pigment in the common polyvinyl chloride (PVC) material; meanwhile, the surface strength of the refrigerator door seal rubber sleeve is increased, the phenomenon that the surface of the rubber sleeve is easily scratched is eliminated, the elastic modulus of a rubber sleeve material is improved, the deformation degree of a common rubber sleeve is reduced, the overall sealing performance of a refrigerator is good, the processing flowability of granules of the material is improved, and the rejection rate of the material in the process of manufacturing the refrigerator door seal is reduced.
The physical property test result of the refrigerator door seal material is as follows:
example two:
the sealing rubber sleeve material of the refrigerator door is accurately weighed according to the following parts:
adding nanoscale metal powder, which is a related component in accurately weighed metal highlight powder, and a titanate coupling agent accounting for 1-2% of the weight of the nanoscale metal powder into a high-speed mixing pot through a high-speed mixing machine charging barrel, raising the temperature of the high-speed mixing pot, mixing the nanoscale metal powder and the titanate coupling agent at a low speed for 30min when the temperature of the high-speed mixing pot is raised to 100-110 ℃, fully mixing the nanoscale metal powder and the titanate coupling agent, discharging the mixture from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for subsequent use (first-stage mixing);
adding the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial mildew preventive which are weighed accurately according to the parts by weight in the second embodiment into a high-speed mixing pot through a charging barrel of the high-speed mixing pot at normal temperature, and mixing at low speed for 1-3 min to fully mix the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial mildew preventive (second-stage mixing);
heating the plasticizer which is accurately weighed according to the weight part in the second embodiment to 40 ℃, completely putting the plasticizer into a plasticizer storage barrel or a high-speed mixing pot charging barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, entering a low-speed mixing cold mixing pot, and discharging until the cold mixing temperature reaches 50 ℃ to obtain dry and uniform mixed powder (third-stage mixed material);
extruding and granulating the mixed powder by adopting a double-screw extruder, setting the temperature parameters of a first area to an eighth area of a screw of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be: the temperature of the ninth zone is 110 ℃, the temperature of the tenth zone is 130 ℃, the temperature of the eleventh zone is 140 ℃, the temperature of the twelfth zone is 160 ℃, the temperature of a machine head is 170 ℃, the temperature of a melt is 135-170 ℃, the rotating speed of a main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized and agglomerated, the temperature near a hopper of the double-screw extruder is lowest, then the temperature is gradually increased, the temperature of a neck mold at the rear end of the double-screw extruder is highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture granule;
and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃, a host frequency of 30-50 HZ and a host rotation speed of 180 r/min, discharging the mixture from the single-screw extruder, cooling the mixture in a cold water tank, and cutting when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door seal rubber sleeve.
Then cutting, penetrating magnetism and heat welding are carried out to obtain a complete finished product of the refrigerator door seal.
The metal highlight powder in the refrigerator door seal rubber sleeve prepared by the formula and the process can eliminate the migration of the plasticizer to the surface of the door seal rubber sleeve, promote the melting of materials, reduce the viscosity and the processing temperature of a melt and improve the processing speed; meanwhile, the nanoscale metal powder in the metal highlight powder can partially migrate to the surface of the refrigerator door seal rubber sleeve product, so that the surface of the product is in a metal color, the mechanical property of the material is integrally improved, the surface strength of the door seal rubber sleeve is increased, and the surface of the refrigerator door seal rubber sleeve is not easily scratched; the material has good granule processing fluidity, and the refrigerator door sealing rubber sleeve made of the material is not easy to crack, thereby effectively reducing the rejection rate of products.
Compared with the common refrigerator door seal rubber sleeve PVC material, the material solves the problems of monotonous color of the common door seal rubber sleeve, large color contrast with a side plate panel of a refrigerator door in contact and poor overall harmony, and solves the problems that the metal powder pigment is easily dispersed unevenly and falls off due to the direct addition of the metal powder pigment in the common polyvinyl chloride (PVC) material; meanwhile, the surface strength of the refrigerator door seal rubber sleeve is increased, the phenomenon that the surface of the rubber sleeve is easily scratched is eliminated, the elastic modulus of a rubber sleeve material is improved, the deformation degree of a common rubber sleeve is reduced, the overall sealing performance of a refrigerator is good, the processing flowability of granules of the material is improved, and the rejection rate of the material in the process of manufacturing the refrigerator door seal is reduced.
The physical property test result of the refrigerator door seal material is as follows:
example three:
the sealing rubber sleeve material of the refrigerator door is accurately weighed according to the following parts:
adding nanoscale metal powder, which is a related component in accurately weighed metal highlight powder, and a titanate coupling agent accounting for 1-2% of the weight of the nanoscale metal powder into a high-speed mixing pot through a high-speed mixing machine charging barrel, raising the temperature of the high-speed mixing pot, mixing the nanoscale metal powder and the titanate coupling agent at a low speed for 30min when the temperature of the high-speed mixing pot is raised to 100-110 ℃, fully mixing the nanoscale metal powder and the titanate coupling agent, discharging the mixture from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for subsequent use (first-stage mixing);
adding the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent which are precisely weighed according to the weight parts in the third embodiment into a high-speed mixing pot for secondary mixing at normal temperature through a charging barrel of the high-speed mixing pot, and fully mixing the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent after mixing at low speed for 1-3 min (secondary mixing);
heating the plasticizer which is accurately weighed according to the weight parts in the third embodiment to 40 ℃, completely putting the plasticizer into a plasticizer storage barrel or a high-speed mixing pot charging barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, entering a low-speed mixing cold mixing pot, and discharging until the cold mixing temperature reaches 50 ℃ to obtain dry and uniform mixed powder (third-stage mixed material);
extruding and granulating the mixed powder by adopting a double-screw extruder, setting the temperature parameters of a first area to an eighth area of a screw of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be: the temperature of the ninth zone is 110 ℃, the temperature of the tenth zone is 130 ℃, the temperature of the eleventh zone is 150 ℃, the temperature of the twelfth zone is 160 ℃, the temperature of a machine head is 170 ℃, the temperature of a melt is 135-170 ℃, the rotating speed of a main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized and agglomerated, the temperature near a hopper of the double-screw extruder is lowest, then the temperature is gradually increased, the temperature of a neck mold at the rear end of the double-screw extruder is highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture granule;
and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃, a host frequency of 30-50 HZ and a host rotation speed of 200 r/min, discharging the mixture from the single-screw extruder, cooling the mixture in a cold water tank, and cutting when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door seal rubber sleeve.
Then cutting, penetrating magnetism and heat welding are carried out to obtain a complete finished product of the refrigerator door seal.
The metal highlight powder in the refrigerator door seal rubber sleeve prepared by the formula and the process can eliminate the migration of the plasticizer to the surface of the door seal rubber sleeve, promote the melting of materials, reduce the viscosity and the processing temperature of a melt and improve the processing speed; meanwhile, the nanoscale metal powder in the metal highlight powder can partially migrate to the surface of the refrigerator door seal rubber sleeve product, so that the surface of the product is in a metal color, the mechanical property of the material is integrally improved, the surface strength of the door seal rubber sleeve is increased, and the surface of the refrigerator door seal rubber sleeve is not easily scratched; the material has good granule processing fluidity, and the refrigerator door sealing rubber sleeve made of the material is not easy to crack, thereby effectively reducing the rejection rate of products.
Compared with the common refrigerator door seal rubber sleeve PVC material, the material solves the problems of monotonous color of the common door seal rubber sleeve, large color contrast with a side plate panel of a refrigerator door in contact and poor overall harmony, and solves the problems that the metal powder pigment is easily dispersed unevenly and falls off due to the direct addition of the metal powder pigment in the common polyvinyl chloride (PVC) material; meanwhile, the surface strength of the refrigerator door seal rubber sleeve is increased, the phenomenon that the surface of the rubber sleeve is easily scratched is eliminated, the elastic modulus of a rubber sleeve material is improved, the deformation degree of a common rubber sleeve is reduced, the overall sealing performance of a refrigerator is good, the processing flowability of granules of the material is improved, and the rejection rate of the material in the process of manufacturing the refrigerator door seal is reduced.
The physical property test result of the refrigerator door seal material is as follows:
wherein: the results of the relevant numerical values of the physical property tests of the refrigerator door seal material in the above-mentioned embodiments I to III are statistically included in the tables in the embodiments I to III, respectively.
To further describe, the PVC resin of the first to third embodiments is S-60/S-65/S-70, manufactured by Taiwan plastics industries, Ltd; adipic acid in the plasticizer is produced by Zhengzhou Xintian and chemical products Co., Ltd, polyester polyol in the plasticizer is produced by Nanjing banuo biological technology Co., Ltd, dioctyl terephthalate in the plasticizer is produced by blue Sail chemical Co., Ltd, trioctyl trimellitate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, epoxidized soybean oil in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, cyclohexane 1, 2-diisononyl phthalate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, dioctyl sebacate in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, dioctyl adipate in the plasticizer is produced by Co-formed chemical industry Co., Ltd;
the thermoplastic polyurethane elastomer TPU in the elastomer is produced by Baoli Wei plastics Limited, Shenzhen, the nitrile rubber P83 in the elastomer is produced by Shanghai Liangdian chemicals Limited, and the ethylene-vinyl acetate copolymer EVA in the elastomer is produced by Shanghai Yan quasi-biotechnology Limited;
the calcium carbonate is produced by Jiangxi Guangyi chemical industry, Inc.;
the stabilizer is a lead-free calcium zinc stabilizer produced by Huizhou brocade source plasticizing materials, Inc.;
the stearic acid in the lubricant is produced by eastern palm industry limited company in a model of VA-1865, the paraffin in the lubricant is produced by China Petroleum-smoothing petrochemical company in a model of 58, and the PE wax in the lubricant is produced by Jiangxi Macro-Yuan chemical industry limited company in a model of PE-2;
4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City, low-yellowing pyridine zinc sulfate ZPT in the antibacterial mildew preventive is produced by the Ahaole mildew-proof antibacterial science and technology Limited in Guangzhou, and water-soluble N-octyl isothiazolinone OIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (4)
1. The metallic refrigerator door seal gum cover composite material is characterized by comprising metallic highlight powder, wherein the metallic highlight powder is a nanoscale metal powder mixture, the metallic highlight powder consists of mica particles, metal powder and titanate coupling agent, the titanate coupling agent in the metallic highlight powder accounts for 1-2% of the weight of the metallic highlight powder,
the metal refrigerator door sealing rubber sleeve composite material is composed of PVC resin, a plasticizer, an elastomer, a stabilizer, a lubricant, an antibacterial mildew preventive and metal highlight powder, wherein the metal refrigerator door sealing rubber sleeve composite material comprises the following components in parts by weight:
100 parts of PVC resin, 50-90 parts of plasticizer, 5-20 parts of elastomer, 0-60 parts of filler, 1-5 parts of stabilizer, 0.2-1 part of lubricant, 0.2-2 parts of antibacterial mildew preventive and 7 parts of metal highlight powder, wherein the unit of weight is gram.
2. The metallic refrigerator door sealant sleeve composite material of claim 1, wherein the PVC resin is a polar amorphous polymer, the PVC resin is compounded and mixed with one or more of the polyvinyl chloride resins with average polymerization degrees of 800, 1000 and 1300, the plasticizer is an ester polymerized by adipic acid and polyester polyol, and is further compounded with one or more of trioctyl trimellitate, dioctyl terephthalate, dioctyl sebacate, cyclohexane 1, 2-diisononyl phthalate, dioctyl adipate and epoxidized soybean oil, the elastomer is compounded by one or more of thermoplastic polyurethane elastomer TPU, nitrile rubber P83 and ethylene-vinyl acetate copolymer EVA, the filler is calcium carbonate particles with a particle size range of 6.5-15 um, and the stabilizer is zinc stearate, the metal highlight powder is prepared by compounding two or more of calcium stearate, hydrotalcite, pentaerythritol, phosphite ester, beta-diketone and 1076 antioxidant, wherein the lubricant is prepared by compounding one or more of stearic acid, paraffin and PE wax, the antibacterial mildew preventive is prepared by compounding one or more of 4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT, low-yellowing pyridine zinc sulfate ZPT and water-soluble N-octyl isothiazolinone OIT, and the metal highlight powder is prepared by mixing mica with 1-2% of titanate coupling agent in parts by mass.
3. The composite material as claimed in claim 2, wherein the PVC resin is S-60/S-65/S-70 manufactured by Taiwan plastics industry Co., Ltd; adipic acid in the plasticizer is produced by Zhengzhou Xintian and chemical products Co., Ltd, polyester polyol in the plasticizer is produced by Nanjing banuo biological technology Co., Ltd, dioctyl terephthalate in the plasticizer is produced by blue Sail chemical Co., Ltd, trioctyl trimellitate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, epoxidized soybean oil in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, cyclohexane 1, 2-diisononyl phthalate in the plasticizer is produced by Co-formed chemical industry Co., Ltd, dioctyl sebacate in the plasticizer is produced by Jiaao environmental protection technology Co., Ltd, dioctyl adipate in the plasticizer is produced by Co-formed chemical industry Co., Ltd;
the thermoplastic polyurethane elastomer TPU in the elastomer is produced by Baoli Wei plastics Limited, Shenzhen, the nitrile rubber P83 in the elastomer is produced by Shanghai Liangdian chemicals Limited, and the ethylene-vinyl acetate copolymer EVA in the elastomer is produced by Shanghai Yan quasi-biotechnology Limited;
the calcium carbonate is produced by Jiangxi Guangyi chemical industry, Inc.;
the stabilizer is a lead-free calcium zinc stabilizer produced by Huizhou brocade source plasticizing materials, Inc.;
the stearic acid in the lubricant is produced by eastern palm industry Limited company in a model number of VA-1865, the paraffin in the lubricant is produced by China Petroleum-smoothing petrochemical company in a model number of 58, and the PE wax in the lubricant is produced by Jiangxi Macro-telechemistry Limited company in a model number of PE-2;
4, 5-dichloro-N-octyl-3-isothiazolinone DCOIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City, low-yellowing pyridine zinc sulfate ZPT in the antibacterial mildew preventive is produced by the Ahaole mildew-proof antibacterial science and technology Limited in Guangzhou, and water-soluble N-octyl isothiazolinone OIT in the antibacterial mildew preventive is produced by the beauty chemical company Limited in Foshan City.
4. The preparation method of the metallic refrigerator door seal rubber sleeve composite material according to claim 1, which comprises the following specific steps:
1) weighing: accurately weighing related components in the metal highlight powder according to the weight part of claim 1 and other components according to the weight part range in claim 2;
2) first-stage low-speed mixing: adding nanoscale metal powder and titanate coupling agent which accounts for 1-2% of the weight of the nanoscale metal powder into the high-speed mixing pot through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, raising the temperature of the high-speed mixing pot, fully mixing the coupling agent and the metal powder after the high-speed mixing pot is heated to 100-110 ℃ and mixed at low speed for 30min, discharging from the high-speed mixing pot, and cooling the obtained mixed powder to normal temperature for later use;
and (3) secondary material mixing: adding the PVC resin, the stabilizer, the lubricant and the antibacterial and mildewproof agent which are accurately weighed according to the claim 3 into a high-speed mixing pot for secondary mixing at normal temperature through a charging barrel of the high-speed mixing pot by adopting a high-speed mixing pot, and fully mixing the PVC resin, the elastomer, the filler, the stabilizer, the lubricant and the antibacterial and mildewproof agent after mixing at low speed for 1-3 min;
third-stage material mixing: heating the plasticizer accurately weighed according to claim 3 to 40 ℃, putting the plasticizer into a plasticizer storage barrel or a high-speed mixing kettle barrel, slowly adding into a high-speed mixing pot containing the second-stage mixed material through a plasticizer storage barrel or a high-speed mixing pot material barrel, stirring at high speed by the high-speed mixing pot, heating by friction, when the temperature of the high-speed mixing pot rises to 100 ℃, the plasticizer in the plasticizer storage barrel or the charging barrel of the high-speed mixing pot is added, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 105 ℃, the mixed powder obtained by the first-stage low-speed mixing is added into the high-speed mixing pot for the second-stage mixing according to the formula proportion, the high-speed mixing is continued, when the temperature of the high-speed mixing pot rises to 120-130 ℃, discharging from the high-speed mixing pot, entering a low-speed mixing cold mixing pot, and discharging until the cold mixing temperature reaches 50 ℃ to obtain dry and uniform mixed powder;
3) and (3) granulation: extruding and granulating the mixed powder by adopting a double-screw extruder, setting the temperature parameters of a first area to an eighth area of a screw of a double-screw extrusion section to be 100-170 ℃, and setting the temperature parameters of the double-screw extrusion section to be: the temperature of the ninth zone is 100-130 ℃, the temperature of the tenth zone is 100-140 ℃, the temperature of the eleventh zone is 100-140 ℃, the temperature of the twelfth zone is 100-150 ℃, the temperature of the machine head is 140-170 ℃, the temperature of the melt is 135-170 ℃, the rotating speed of the main machine is 150-220 r/min, the residence time of the powder in the double-screw section is controlled, the residence time of the powder in the double-screw section is reduced as far as possible under the condition that the powder is plasticized into lumps, the temperature near the hopper of the double-screw extruder is the lowest, then the temperature is gradually increased, the temperature at the neck ring at the rear end of the double-screw extruder is the highest, and the extruded material is air-cooled to the normal temperature to obtain a mixture granule;
4) and (3) extrusion molding of the rubber sleeve: and (2) carrying out extrusion molding on the mixture granules by a single-screw extruder, wherein the granulated mixture granules can promote mutual melting of all components of the material, reduce the viscosity of a melt, properly control the extrusion molding temperature, and set parameters of the single-screw extruder as a first zone temperature of 110-130 ℃, a second zone temperature of 125-135 ℃, a third zone temperature of 135-145 ℃, a fourth zone temperature of 145-155 ℃, a fifth zone temperature of 150-170 ℃, a head temperature of 145 ℃ and a host frequency of 30-50 HZ, cooling the mixture granules in a cold water tank after the mixture granules are discharged from the single-screw extruder, and cutting the mixture granules when the temperature of the extruded material is reduced to 25-30 ℃ to obtain the metal refrigerator door sealing rubber sleeve.
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| EP0058979B1 (en) * | 1981-02-23 | 1986-11-12 | Sumitomo Naugatuck Co., Ltd. | Thermoplastic resin composition excellent in color development |
| CN1861676A (en) * | 2005-05-13 | 2006-11-15 | 上海君江科技有限公司 | Electrostatic-proofing polyvinyl chloride compeosite material and preparation process thereof |
| CN101717554B (en) * | 2009-12-16 | 2013-09-25 | 广东盛恒昌化学工业有限公司 | Plastic profiled bar decorative layer combination material with metal-like natural texture, preparation method and application thereof |
| CN106280134A (en) * | 2016-08-31 | 2017-01-04 | 合肥美菱股份有限公司 | A kind of refrigerator, refrigerator-freezer TPU elastomer gasket and preparation method thereof |
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