CN115418048A - Anti-shrinkage polypropylene furniture board composite material and preparation method thereof - Google Patents
Anti-shrinkage polypropylene furniture board composite material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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Abstract
The invention provides an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof, wherein the anti-shrinkage polypropylene furniture board composite material comprises the following raw materials: polypropylene, an organic elastomer, modified mesoporous silica, organic montmorillonite and a lubricant, wherein the modified mesoporous silica is obtained by grafting and modifying the mesoporous silica through dimethylchlorosilane. According to the invention, the mesoporous silica is subjected to graft modification by utilizing the dimethylchlorosilane, the composite material containing the modified mesoporous silica has lower shrinkage rate, the change rate of the glossiness after thermo-oxidative aging is smaller, and in addition, the impact property of the composite material can be improved by matching the modified mesoporous silica with the organic elastomer.
Description
Technical Field
The invention belongs to the technical field of polypropylene composite materials, and particularly relates to an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof.
Background
Polypropylene is a thermoplastic resin obtained by polymerizing propyleneFat, non-toxic, odorless, tasteless, milky-white, highly crystalline polymer having a density of only 0.9-0.91g/cm 3 The plastic is one of the lightest varieties of all the plastics at present, is particularly stable to water, and is widely applied to the fields of household appliances, furniture, automobile parts and the like.
With the improvement of living standard and the national emphasis on basic construction, the polypropylene furniture has the highest occurrence rate in parks, stations and various indoor and outdoor recreation places in recent years, and is more and more popular and occupies a place in the furniture market of ordinary families. The polypropylene furniture mainly comprises various models of portable chairs, stools, simple tables, containers, bookshelves and the like. The product is popular with people in terms of beauty, low price, lightness and novel modeling, and has the characteristics of moisture resistance, mildew resistance and long service life compared with wooden furniture when used outdoors.
The polypropylene has good formability, the polypropylene integral furniture or furniture plate components (drawers, brackets, side plates and the like) are all formed by injection molding, the material temperature is generally controlled between 180 ℃ and 240 ℃, but the shrinkage rate is large (1-2.5%), wall-thickness products are easy to dent, the injection mold temperature needs to be strictly controlled by cooling water provided by a special refrigerator, and after the products are taken out by opening the mold, in order to prevent shrinkage deformation, shaping measures, namely, a special fixing frame is used for fixing and placing for a period of time, so that the production efficiency is greatly reduced, and the labor consumption is increased.
Patent CN201310292084.6 discloses a modified polypropylene material with low molding shrinkage and no buckling deformation and a preparation method thereof, wherein the modified polypropylene material comprises the following components in percentage by mass: 50 to 55 percent of polypropylene, 25 to 30 percent of filler, 5 to 10 percent of glass fiber, 3 to 8 percent of shrinkage rate regulator, 3 to 8 percent of elastomer, 0.5 to 1 percent of coupling agent, 0.4 to 1 percent of dispersant and 0.2 to 0.5 percent of antioxidant; the filler is a composition of hydrated magnesium silicate and light calcium carbonate, wherein the relative density of the hydrated magnesium silicate is 2.7-2.8 g/cm < 3 >, and the particle size is 3000-8000 meshes; the light calcium carbonate has the relative density of 2.7-2.9 g/cm 3 and the particle size of 10000-30000 meshes; the patent CN201810301788.8 discloses a low-shrinkage polypropylene material and a preparation method thereof, wherein the low-shrinkage polypropylene material comprises, by weight, 17-40 parts of a polypropylene homopolymer, 25-40 parts of a polypropylene copolymer, 3-8 parts of calcium carbonate, 12-17 parts of talcum powder, 8-10 parts of magnesium hydroxide, 3-6 parts of metallocene linear low-density polyethylene, 4-8 parts of a toughening agent, 0.3-0.6 part of an antioxidant, 0.3-0.7 part of a dispersing agent and 0.3-0.5 part of an anti-dripping agent.
The technology uses a large amount of inorganic filler, and the inorganic filler can not shrink, reduce the crystallinity of PP and change the structural form of PP so as to solve the problem of large shrinkage of polypropylene. Although this technique solves the problem of large shrinkage, it also causes another problem: because the inorganic filler has strong polarity and high surface energy, and the polypropylene is a typical non-polar material, even if a coupling agent or a solubilizer is arranged in a system to improve the interfacial interaction force, the migration of the filler under the high-temperature condition can not be reduced, so that the filler under the surface is excessively saturated to generate precipitation, the surface is rough, color spots and color lines are generated, and the hand feeling and the visual effect are poor. In conclusion, the development of the polypropylene-based furniture material with excellent anti-shrinkage performance and small change of glossiness after high-temperature aging has important significance for improving the production efficiency, saving manpower and material resources and adapting to more and more extreme high-temperature weather.
Disclosure of Invention
In order to solve the technical problems, the invention provides an anti-shrinkage polypropylene furniture board composite material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the shrinkage-resistant polypropylene furniture board composite material comprises the following raw materials: the modified mesoporous silica is obtained by grafting and modifying mesoporous silica through dimethyl alkyl chlorosilane.
Further, the anti-shrinkage polypropylene furniture board composite material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene, 5-10 parts of organic elastomer, 10-20 parts of modified mesoporous silica, 5-10 parts of organic montmorillonite and 3-5 parts of lubricant, wherein the weight of the dimethyl alkyl chlorosilane is 5-10 times that of the mesoporous silica; the number of carbon atoms of the hydrocarbon group is 6 to 18, preferably 10 to 18.
According to the invention, the compatibility of the mesoporous silica is greatly improved by grafting modification of the mesoporous silica by utilizing the dimethyl alkyl chlorosilane, the modified mesoporous silica can be completely infiltrated by the polypropylene during melting processing, the polypropylene chain segment moves into the hole on the mesoporous silica under heating, and complex entanglement and entanglement are generated between the polypropylene molecule and the mesoporous silica, so that the migration of the modified mesoporous silica can be reduced, and the migration of other fillers can be blocked. Therefore, the number of the hydrocarbon carbon atoms on the dimethylchlorosilane and the dosage of the dimethylchlorosilane are strictly limited, and too little or too much is not beneficial to generating stable entanglement and entanglement between the polypropylene molecular chain segment or other molecular chain segments in the system and the mesoporous silica.
The inventor finds that the impact performance of the composite material can be improved by matching the modified mesoporous silica with the organic elastomer, and supposedly, although the mesoporous silica is provided with mesopores and is easy to collapse under stress to reduce the impact strength, the polarity of the modified mesoporous silica is close to that of the organic elastomer, so that an elastomer chain segment is embedded into the mesopores, and the phase structure around the mesoporous silica is changed towards the direction beneficial to the impact performance.
The average grain diameter of the mesoporous silicon dioxide is 0.2-0.5 mu m, and the specific surface area is 200-600m 2 (ii)/g, the average pore diameter is 2nm-10nm.
The particle size of the organic montmorillonite is 1-10 μm, the interlayer spacing is 1-4nm, and the thickness-diameter ratio is 100-500, preferably 150-300.
The organic montmorillonite is one of sodium montmorillonite organically treated by single long-chain alkyl quaternary ammonium salt, and the treatment method comprises one of solid phase treatment or wet treatment, preferably wet treatment.
The organic montmorillonite can be purchased or made by self, namely water is used as a dispersion medium, and the self-making can refer to the influence of reaction ratio on the interlayer structure of the nano organic montmorillonite of Zhangkun et al, mineral product protection and utilization, 2007 (3): 4.
Specifically, the organic modified montmorillonite can be prepared by a method comprising the following steps if the organic modified montmorillonite is self-made:
dispersing sodium montmorillonite in water to obtain dispersion, heating and maintaining the temperature, adding single long-chain alkyl quaternary ammonium salt, stirring for reaction, filtering, washing, drying, and grinding to obtain the organic modified montmorillonite.
The solid-liquid ratio of the montmorillonite dispersion liquid is 3-5 to 300, the using amount of the single long-chain alkyl quaternary ammonium salt is 35-65wt% of the montmorillonite, the washing is alternately washing for 3 times by using deionized water and ethanol, the temperature rise is to 60-90 ℃, the drying is drying for 3-5h in a drying oven at 60-80 ℃, the stirring rotating speed is 200-400r/min, the stirring reaction time is 1-3h, and the grinding is to grind the montmorillonite dispersion liquid to the particle size of 1-10 mu m.
The single-long-chain alkyl quaternary ammonium salt is selected from one or a combination of two or more of octadecyl trimethyl ammonium chloride, octadecyl benzyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chloride, hexadecyl benzyl dimethyl ammonium chloride and dodecyl benzyl dimethyl ammonium chloride.
The dimethylchlorosilane is selected from one or a combination of two or more of dimethylhexylchlorosilane, dimethyloctylchlorosilane, dimethyldecylchlorosilane, dodecyldimethylchlorosilane, n-triacontyldimethylchlorosilane, dimethyltetradecylchlorosilane, hexadecyldimethylchlorosilane and dimethyloctadecylchlorosilane.
The modified mesoporous silica is prepared by the method comprising the following steps:
1) Activating the mesoporous silica at high temperature;
2) Dispersing the mesoporous silica obtained in the step 1) into an organic solvent, adding dimethyl alkyl chlorosilane, introducing nitrogen, heating and keeping the temperature constant, carrying out closed reflux reaction, filtering, washing, and carrying out vacuum drying to obtain the modified mesoporous silica.
The high-temperature activation condition in the step 1) is 250-300 ℃ and 12-24h;
the organic solvent in the step 2) is one or a combination of two or more of toluene, diethyl ether, chloroform, dichloromethane and isopropyl ether; the temperature is raised to 60-100 ℃, the reaction time is 12-36h, the detergent is one or the combination of ethanol and acetone, the vacuum drying temperature is 60-100 ℃, the vacuum degree is 0.01-0.1MPa, and the time is 6-24h.
The mesoporous silica has high concentration of Si-OH on the surface, the groups can be used as the positioning points of grafting, but not all the Si-OH are active, most of the groups are combined in a hydrogen bond mode, so that high-temperature activation is needed, and the original structure of the grafted mesoporous silica can be reserved without obvious change. The grafted dimethyl alkyl chlorosilane can improve the hydrophobicity of the mesoporous silicon dioxide, prevent the skeleton from hydrolysis, improve the stability and facilitate the adsorption of other molecules, groups and chain segments with similar polarity.
The melt index of the organic elastomer is 5-20g/10min.
The organic elastomer type is one or the combination of two or more of ethylene-octene copolymer, ethylene propylene diene rubber, ethylene-butene copolymer and styrene-butadiene-styrene block copolymer. Preferably, the organic elastomer is an ethylene-octene copolymer.
The melt index of the polypropylene is 0.3-2g/10min.
Preferably, the polypropylene is a propylene and alpha-olefin copolymer polypropylene, wherein the content of the alpha-olefin is 1-10wt%, and the alpha-olefin comprises one or two of ethylene, butylene and pentene, preferably ethylene.
The lubricant is not particularly limited, and may be one or a combination of two or more of calcium stearate, zinc stearate, magnesium stearate, barium stearate, vinyl bis stearamide, pentaerythritol stearate, and oleamide, which are commonly used in the art.
The invention also provides a preparation method of the anti-shrinkage polypropylene furniture board composite material, which comprises the following steps:
adding the polypropylene, the organic elastomer, the modified mesoporous silica, the organic montmorillonite and the lubricant into a mixer, uniformly mixing, adding into a double-screw extruder, extruding and granulating, and finally performing injection molding through an injection molding machine.
The extrusion process of the double-screw extruder comprises the following steps: the extrusion temperature is 190-230 ℃, and the screw rotation speed is 100-130r/min.
The injection molding machine is a single-screw injection molding machine, and the injection molding process of the injection molding machine comprises the following steps: the rotating speed of the screw is 25-40mm/s, the temperature of the mold is 20-30 ℃, the injection temperature is 190-220 ℃, the injection pressure is 48-60MPa, the pressure maintaining pressure is 35-45MPa, the pressure maintaining time is 5-15s, and the cooling time is 30-45s.
The thickness of the injection molding part is 3-5mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the mesoporous silica is subjected to graft modification by using the dimethylchlorosilane to obtain the filler with good compatibility with polypropylene, and the composite material containing the modified mesoporous silica has low shrinkage and small change of glossiness after high-temperature aging.
The inventors found that the impact performance of the composite material can be improved by using the modified mesoporous silica and the organic elastomer in a matching way, and supposedly, although the mesoporous silica has mesopores, the mesopores are easy to collapse under stress to reduce the impact strength, but the polarity of the modified mesoporous silica is close to that of the organic elastomer, so that the elastomer chain segment is embedded into the mesopores, and the structure of the phase around the mesoporous silica is changed in a direction beneficial to the impact performance.
According to the invention, after the mold is opened and the product is taken out, a shaping measure is not needed, so that the production efficiency is greatly improved, and manpower and material resources are saved.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the descriptions in the following. Unless otherwise specified, "parts" in the examples of the present invention are parts by weight. All reagents used are commercially available in the art.
The polypropylene powder is purchased from a macro chemical plant of a Luoyang petrochemical general factory, the melt index is 0.3g/10min, and the ethylene content is 7wt%;
ethylene octene copolymers (POEs) are available from DOW chemical company, USA under the trade name ENGAGE 8130;
sodium montmorillonite was purchased from Shanghai spectral vibration Biotech, inc. (Clarmael);
octadecyl trimethyl ammonium chloride purchased from kovia Europe;
the mesoporous silica is available from Shanghai Ke-sensitized Biotechnology Co., ltd, and has an average particle diameter of 0.45 μm and a specific surface area of 330m 2 (ii)/g, average pore diameter 8.7nm;
the fine calcium carbonate is purchased from Hebei Cai Rui building materials Co., ltd, and has an average particle size of 0.45 μm;
talcum powder was purchased from Asahon powder and had an average particle size of 3.5. Mu.m.
Preparation of organic montmorillonite
Preparation example a1
Dispersing 5 parts of sodium montmorillonite in 300 parts of water to prepare a dispersion liquid, adjusting the pH value to 7, heating to 60 ℃, keeping the temperature constant, adding 2.5 parts of octadecyl trimethyl ammonium chloride, stirring at 400r/min for reaction for 3 hours, performing suction filtration, alternately washing for 3 times by using deionized water and ethanol, drying in a vacuum drying oven at 60 ℃ for 3 hours, and grinding until the particle size is 3.7 mu m to obtain the organic modified montmorillonite.
Preparation of shrinkage-resistant polypropylene-based furniture material
Preparation b1
1) Activating the mesoporous silica at 250 ℃ for 12 hours;
2) Dispersing 10 parts of the mesoporous silica obtained in the step 1) into 180 parts of toluene, adding 100 parts of dimethyloctadecylchlorosilane, introducing nitrogen, heating to 80 ℃, keeping the temperature constant, carrying out closed reflux reaction for 24 hours, filtering, washing with ethanol, and carrying out vacuum drying at 100 ℃ and 0.1MPa for 24 hours to obtain the modified mesoporous silica.
Preparation b2
The procedure was as in preparation b1, except that 50 parts of dimethyloctadecylchlorosilane were used.
Preparation example b3
The procedure is as in preparation b1, except that dimethyldecylchlorosilane is used instead of dimethyloctadecylchlorosilane.
Preparation b4
The procedure is as in preparation b1, except that dimethylhexylchlorosilane is used instead of dimethyloctadecylchlorosilane.
Preparation example b5
Otherwise the process is as in preparation b1, except that 150 parts of dimethyloctadecylchlorosilane are used.
Preparation example b6
The procedure was as in preparation b1, except that 40 parts of dimethyloctadecylchlorosilane were used.
Preparation of anti-shrinkage polypropylene furniture board composite material
Example 1
60 parts of polypropylene, 5 parts of POE, 20 parts of modified mesoporous silica prepared in preparation example b1, 5 parts of organic montmorillonite prepared in preparation example a1 and 5 parts of zinc stearate are added into a mixer to be uniformly mixed, and granulation is carried out under the following extrusion process conditions of a double-screw extruder, and then injection molding is carried out under the following injection molding process conditions, so as to injection mold a 100mm × 100mm × 5mm plate.
The extrusion process of the JSH30 double-screw extruder in Nanjing rubber and plastic machine factory comprises the following steps: the temperature of the five temperature zones is 190 ℃,200 ℃, 210 ℃, 220 ℃, 230 ℃, the head temperature is 225 ℃, and the screw rotation speed is 120r/min;
the injection molding process of the TFV4-35 single-screw injection molding machine (the heating temperature zone is modified into 5) of the Taifu machine comprises the following steps: the rotating speed of the screw is 25mm/s, the temperature of the mold is 23 ℃, the temperature of five temperature zones of the injection molding machine is 190 ℃,200 ℃, 210 ℃, 220 ℃ and 220 ℃, the injection pressure is 55MPa, the pressure maintaining pressure is 40MPa, the pressure maintaining time is 10s, and the cooling time is 30s.
Examples 2 to 6
The same as example 1 except that modified mesoporous silica was used as prepared in preparation examples b2 to b6, respectively.
Example 7
The process was repeated in the same manner as in example 1 except that 10 parts of modified mesoporous silica was used.
Example 8
The procedure was as in example 1 except that POE was used in an amount of 10 parts.
Comparative example 1
The rest is the same as example 1 except that mesoporous silica is used instead of the modified mesoporous silica.
Comparative example 2
The procedure of example 1 was repeated, except that talc having an average particle size of 3.5 μm was used in place of the organic montmorillonite and that fine calcium carbonate having an average particle size of 0.45 μm was used in place of the mesoporous silica.
Comparative example 3
The procedure was as in example 1 except that POE was not used in the system.
The sheets prepared in examples 1-8 and comparative examples 1-3 above were subjected to the following performance tests, the results of which are shown in Table 1:
shrinkage rate: the determination is carried out with reference to the determination of the shrinkage in injection moulding of thermoplastics according to standard GB/T15585-1995, the axial direction being parallel to the direction of flow and the radial direction being the diameter direction.
Impact property: the measurement is carried out according to the measurement of the impact strength of a plastic cantilever beam of the standard GB/T1843-2008.
Thermal oxidation aging: according to the standard GB/T7141-2008 plastic thermal aging test method, thermal oxidation aging is carried out for 500 hours in a constant temperature cabinet at 120 ℃, the plastic is taken out according to the standard GB/T8807-1988 plastic mirror surface gloss test method, and the change rate of the gloss before and after thermal oxidation aging is calculated in percent.
TABLE 1
The table shows that the modified mesoporous silica prepared by the invention has the obvious effect of reducing the shrinkage rate of the composite material, has good compatibility with other substances in a composite material system, and the prepared sheet material has small change of glossiness after high-temperature aging.
In addition, the impact strength test results in the table show that the impact performance of the composite material can be improved by using the modified mesoporous silica and the organic elastomer in a matching way, and the surmised result is that although the mesoporous silica has mesopores and is easy to collapse under stress to cause the reduction of the impact strength, the modified mesoporous silica and the organic elastomer have similar polarities, so that the elastomer chain segment is embedded into the mesopores, and the structure of the phase around the mesoporous silica is changed towards the direction beneficial to the impact performance.
According to the invention, after the mold is opened and the product is taken out, a shaping measure is not needed, so that the production efficiency is greatly improved, and manpower and material resources are saved.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (10)
1. The shrinkage-resistant polypropylene furniture board composite material is characterized by comprising the following raw materials: the modified mesoporous silica is obtained by grafting and modifying mesoporous silica through dimethyl alkyl chlorosilane.
2. The shrinkage-resistant polypropylene furniture board composite material as claimed in claim 1, wherein the shrinkage-resistant polypropylene furniture board composite material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene, 5-10 parts of organic elastomer, 10-20 parts of modified mesoporous silica, 5-10 parts of organic montmorillonite and 3-5 parts of lubricant, wherein the weight of the dimethyl alkyl chlorosilane is 5-10 times that of the mesoporous silica; the number of carbon atoms of the hydrocarbon group is 6 to 18, preferably 10 to 18.
3. The shrinkage-resistant polypropylene furniture board composite material of claim 1, wherein the shrinkage-resistant polypropylene furniture board composite material is formed of a polypropylene materialCharacterized in that the average particle diameter of the mesoporous silica is 0.2-0.5 μm, and the specific surface area is 200-600m 2 (ii)/g, the average pore diameter is 2nm-10nm.
4. The shrinkage-resistant polypropylene furniture board composite material according to claim 1, wherein the dimethylalkylchlorosilane is selected from the group consisting of dimethylhexylchlorosilane, dimethyloctylchlorosilane, dimethyldecylchlorosilane, dodecyldimethylchlorosilane, n-triacontyldimethylchlorosilane, dimethyltetradecylchlorosilane, hexadecyldimethylchlorosilane, dimethyloctadecylchlorosilane, and a combination of two or more thereof.
5. The shrinkage-resistant polypropylene furniture board composite material as claimed in claim 1, wherein the modified mesoporous silica is prepared by a method comprising the steps of:
1) Activating the mesoporous silicon dioxide at high temperature;
2) Dispersing the mesoporous silica obtained in the step 1) into an organic solvent, adding dimethyl alkyl chlorosilane, introducing nitrogen, heating and keeping the temperature constant, carrying out closed reflux reaction, filtering, washing, and carrying out vacuum drying to obtain the modified mesoporous silica.
6. The shrinkage-resistant polypropylene furniture board composite material as claimed in claim 1, wherein the organic montmorillonite has a particle size of 1-10 μm, a layer spacing of 1-4nm, and a thickness-to-diameter ratio of 100-500, preferably 150-300; the organic montmorillonite is one of sodium montmorillonite organically treated by single long-chain alkyl quaternary ammonium salt, and the treatment method comprises one of solid phase treatment or wet treatment, preferably wet treatment; the single-long-chain alkyl quaternary ammonium salt is selected from one or a combination of two or more of octadecyl trimethyl ammonium chloride, octadecyl benzyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chloride, hexadecyl benzyl dimethyl ammonium chloride and dodecyl benzyl dimethyl ammonium chloride.
7. The shrinkage-resistant polypropylene furniture board composite material according to claim 1, wherein the organic elastomer has a melt index of 5 to 20g/10min; the organic elastomer type is selected from one or the combination of two or more of ethylene-octene copolymer, ethylene-propylene-diene monomer, ethylene-butene copolymer and styrene-butadiene-styrene block copolymer; preferably, the organic elastomer is an ethylene-octene copolymer.
8. The shrinkage-resistant polypropylene furniture board composite material according to claim 1, wherein the polypropylene has a melt index of 0.3 to 2g/10min; preferably, the polypropylene is a propylene and alpha-olefin copolymer polypropylene, wherein the content of the alpha-olefin is 1-10wt%, and the alpha-olefin comprises one or two of ethylene, butylene and pentene, preferably ethylene.
9. A method of making the shrinkage-resistant polypropylene furniture board composite of any one of claims 1 to 8, comprising the steps of:
adding the polypropylene, the organic elastomer, the modified mesoporous silica, the organic montmorillonite and the lubricant into a mixer, uniformly mixing, adding into a double-screw extruder, extruding and granulating, and finally performing injection molding through an injection molding machine.
10. The preparation method of the shrinkage-resistant polypropylene furniture board composite material as claimed in claim 9, wherein the extrusion process of the twin-screw extruder is as follows: the extrusion temperature is 190-230 ℃, and the screw rotation speed is 100-130r/min; the injection molding machine is a single-screw injection molding machine, and the injection molding process of the injection molding machine comprises the following steps: the rotating speed of the screw is 25-40mm/s, the temperature of the die is 20-30 ℃, the injection temperature is 190-220 ℃, the injection pressure is 48-60MPa, the pressure maintaining pressure is 35-45MPa, the pressure maintaining time is 5-15s, and the cooling time is 30-45s; the thickness of the injection molding part is 3-5mm.
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|---|---|
| CN115418048B (en) | 2023-09-26 |
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