CN106609014A - Refrigerator door seal, preparation method and application thereof - Google Patents
Refrigerator door seal, preparation method and application thereof Download PDFInfo
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- CN106609014A CN106609014A CN201510694455.2A CN201510694455A CN106609014A CN 106609014 A CN106609014 A CN 106609014A CN 201510694455 A CN201510694455 A CN 201510694455A CN 106609014 A CN106609014 A CN 106609014A
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- refrigerator door
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Abstract
The invention relates to the field of high polymer materials, in particular to a refrigerator door seal, a preparation method and application thereof. The refrigerator door seal provided by the invention is prepared from a foamed PVC material. The refrigerator door seal provided by the invention acquires a proper foaming rate through control of the retention time and processing temperature during strip seal molding by an extruder, thus effectively saving social resources, reducing the cost, and obviously decreasing the thermal conductivity of strip seal. At the same time, the prepared material still has good mechanical properties.
Description
Technical field
The present invention relates to polymeric material field, more particularly to a kind of refrigerator door seal and its production and use.
Background technology
Seal strip for refrigerator door is used between refrigerator door and casing a kind of refrigerator part for sealing, and ensure that fridge freshness retaining is imitated
Really, and the service life of refrigerator can be extended, it is ensured that refrigerator door can be good at closure, reduce the loss of refrigerator inside energy.
Generally, seal strip for refrigerator door is made up of two parts, and a part is soft overcoat, and another part is magnetic rubber strip.
Refrigerator door seal billot (i.e. soft coat part) used in existing household electric appliances is usually by modeling by PVC material
Material extruder production.PVC is the abbreviation of (Polyvinyl chloride) Corvic, polyvinyl chloride homopolymer and polychlorostyrene
Ethylene copolymer is referred to as Corvic, and it is by Vinyl Chloride Monomer (vinyl chloride monomer, abbreviation VCM)
Form with other monomers copolymerization through homopolymerization or by Vinyl Chloride Monomer, Corvic is a kind of white powder or microballon grain, root
There is dividing for soft or hard according to composition difference.And PVC material is a certain proportion of other materials of Corvic addition, in certain temperature
The material produced under degree and pressure effect.
For the refrigerator door seal billot that present household electric appliances are used is prepared by unexpanded PVC material, prepared envelope
There are the problems such as heat conductivity is big, effect of heat insulation is poor, energy consumption is big, usage amount is big, spring rate is poor in billot.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of refrigerator door seal and preparation method thereof and using
On the way, for solving the problems of the prior art.
For achieving the above object and other related purposes, first aspect present invention provides a kind of refrigerator door seal, by foaming PVC material
Prepare.
Preferably, the foaming PVC material, its raw material by weight, including following component：
Preferably, the degree of polymerization of the polrvinyl chloride is 800-2500.
It is furthermore preferred that the degree of polymerization of the polrvinyl chloride is 1000-1300.
Preferably, the plasticizer selected from adipic acid kind polyester, trioctyl trimellitate (TOTM) (TOTM), epoxy soybean oil (ESBO),
One kind in DOTP (DOTP), di-n-octyl sebacate (DOS), dioctyl adipate (DOA) or
Various combinations.
It is furthermore preferred that the plasticizer is the combination of adipic acid kind polyester and epoxy soybean oil, and in the plasticizer, adipic acid class
The weight ratio of polyester and epoxy soybean oil is 1：0.1-1.5.
It is further preferred that the preferred viscosities of the ethanedioic acid kind polyester are (25 DEG C, Mpas) 2400-6000, proportion is (20/20
DEG C) 1.050-1.150, the epoxide number (%) more than 6.0 of epoxy soybean oil, acid number (KOH mg/g) less than 0.5.
Preferably, the filler is Calcium Carbonate.
Preferably, one kind in the acrylic processing aid and Tri- n -butyltin methacrylate processing aid of the processing aid or
Various combinations.
It is furthermore preferred that the processing aid is selected from acrylic processing aid.
It is further preferred that the acrylic processing aid is methyl methacrylate (MMA)/acrylate copolymer, its is heavy
Amount mean molecule quantity (× 104) more than 250.
Preferably, the foaming agent is CBA.
More there is choosing, the CBA is selected from the double benzene sulfonyl hydrazides of azodicarbonamide, sodium bicarbonate, 4,4'- hydroxyls
Plant or various combinations, preferably organic chemistry foaming agent.
Preferably, the antioxidant is selected from the combination of one or more in antioxidant 1010, irgasfos 168, DLTP.
Preferably, the stabilizer is selected from calcium stearate, zinc stearate, beta-diketon, brucite, rare-earth stabilizer, organotin
The combination of one or more in stabilizer, barium zinc stabilizer.
It is furthermore preferred that the stabilizer includes calcium stearate, zinc stearate, beta-diketon and brucite, the weight portion of each component it
Than for：Calcium stearate, zinc stearate, beta-diketon and brucite=1-10：1-10：1-10：1-10.
Preferably, the raw material of the foaming PVC material is included by weight, also such as antimildew and antibacterial agent 0.1-0.5 parts.
Preferably, the preparation method of the foaming PVC material, comprises the steps：
1) polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are mixed；
2) appropriate plasticizer mixed with step 1 resulting material at room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 70-90 DEG C；
4) processing aid is mixed with step 3 resulting material at 125-135 DEG C；
5) step 4 resulting material is cooled to into 90-110 DEG C, adds foaming agent and mix；
6) step 5 resulting material is carried out into banburying, and by the material extruding pelletization obtained by banburying, obtains final product the foaming PVC material
Material.
Preferably, the weight ratio preferably 1 of the plasticizer for being added in the step 2 and step 3：2-5.
Preferably, in the step 6, the actual conditions of banburying is three sections of banburyings, is controlled with temperature and rotating speed, respectively
80-90℃/30-40rpm、100-110℃/35-45rpm、110-120℃/30-40rpm。
Preferably, in the step 6, temperature during extruding pelletization is 90-115 DEG C.
Preferably, the refrigerator door seal is prepared by the foaming PVC material extrusion molding, in the process of refrigerator door seal molding
In, control frothing percentage by controlling the time of staying and processing temperature.
It is furthermore preferred that the frothing percentage of the refrigerator door seal is 13-33%.
It is furthermore preferred that processing temperature is 115-165 DEG C.
Second aspect present invention provides the preparation method of the refrigerator door seal, and the refrigerator door seal is by the foaming PVC material extrusion
Molding is prepared.
Third aspect present invention provides purposes of the refrigerator door seal in freezer component preparation.
Preferably, the freezer component is insulating assembly.As described above, foaming PVC material provided by the present invention, gives as security in Jing
When going out machine strip of paper used for sealing molding, by the time of staying and processing temperature control obtain suitable frothing percentage, effectively save social resources,
Cost is reduced, and is decreased obviously the heat conductivity of strip of paper used for sealing, meanwhile, preparation obtains material and still has good mechanical property.
Specific embodiment
Inventor adds the auxiliary materials such as specific CBA in PVC formula, using special processing mode,
Ensure the CBA unreacted in PVC pellet mixing granulations, only protected by temperature and extrusion speed in gasket extrusion
The certain frothing percentage of card, while internal introducing substantial amounts of micro air bubble, refrigerator doors can be significantly improved so as in refrigerator door seal
Every characteristic of envelope, and ensure that refrigerator door seal material mechanical performance does not decline.
The present invention provides a kind of refrigerator door seal, is prepared by foaming PVC material.Inventor passes through foaming PVC material
Material prepares refrigerator door seal, using the heat-proof quality of foaming PVC material, there is provided a kind of new refrigerator door seal.
Refrigerator door seal provided by the present invention is prepared by foaming PVC material, and described its raw material of foaming PVC material is by weight
Part meter, including following component：
Preferably, described its raw material of foaming PVC material by weight, including following component：
Each component is described in detail below：
Polrvinyl chloride
In the formula of the foaming PVC material, polrvinyl chloride is using 100 parts by weight as radix, and the usage amount of remaining component is equal
Certain weight ratio is formed with polrvinyl chloride.The degree of polymerization of the polrvinyl chloride is 800-2500, and the preferred degree of polymerization is 1000-1300,
The degree of polymerization is that polrvinyl chloride its processing characteristics in the range of 1000-1300, mechanical property, cost performance are optimal.
Plasticizer
Plasticizer is used to reduce PVC material melt temperature and melt viscosity in the foaming PVC material, and it is good to have product
Good flexibility, elastic and resistance to low temperature.
In the foaming PVC material, by weight including 60-90 part plasticizers, 70-85 part plasticizers are preferably included,
Those skilled in the art can be according to technique and the consumption of the different adjustment plasticizers of use environment.The plasticizer is preferably selected from oneself two
Acids polyester, trioctyl trimellitate (TOTM) (TOTM), epoxy soybean oil (ESBO), DOTP (DOTP),
The combination of one or more in di-n-octyl sebacate (DOS), dioctyl adipate (DOS), more preferably adipic acid class
The combination of polyester and epoxy soybean oil, adipic acid kind polyester can give the superior resistance to ABS/PS animal migrations of material, resistance to extractable,
Excellent resilience etc., epoxy soybean oil can give the necessary resistance to extractable of material and heat stability, and both combine can
To reach optimal using effect.The weight of both adipic acid kind polyester and epoxy soybean oil is than preferably adipic acid in plasticizer
Kind polyester：Epoxy soybean oil=1：0.1-1.5, more preferably 1:0.3-1.2.The adipic acid kind polyester is specially adipic acid and two
The high molecular polymer that first amine or dihydroxylic alcohols polycondensation are formed, the adipic acid kind polyester includes but is not limited to polyadipate ethylene glycol
Ester, polyadipate -1,2- propylene glycol esters, polyadipate -1,3 butylene glycol ester, polyadipate -1,4- butanediol esters, polyadipate are new
The combination of one or more in amylalcohol ester, polyadipate -1,6- hexanediol esters, PA 66 etc., the adipic acid class
The preferred viscosities of polyester are (25 DEG C, Mpas) 2400-6000, and preferred specific gravity is (20/20 DEG C) 1.050-1.150 (in mark
Under quasi- atmospheric pressure, 20 DEG C when, the density and pure H of material (completely dense state)2The ratio of the density of O), implement in the present invention one
In example, adipic acid kind polyester model W-2310, supplier is big Japanese ink company；Preferably, the epoxy soybean
The epoxide number (%) more than 6.0 of oil, acid number (KOH mg/g) less than 0.5, in an embodiment of the present invention, the epoxy is big
Oleum Glycines are model E-20, and supplier is Guangzhou Xin Jin dragon plastic additives company limited.
Filler
In the foaming PVC material, by weight including 25-95 part filleies, 40-80 part filleies are preferably included.It is excellent
The filler of choosing is Calcium Carbonate, and the Calcium Carbonate can use precipitated calcium carbonate, it is possible to use ground calcium carbonate, as long as not to this
Bright goal of the invention produces restriction, and the ground calcium carbonate refers to the Calcium Carbonate that sedimentation volume ratio is 1.1-1.9mL/g, lightweight carbon
Sour calcium grease sedimentation volume ratio is the Calcium Carbonate of 2.4-2.8mL/g.In a preferred embodiment, heavy carbonic acid is used
Model LD-800 of calcium, supplier is for vertical up to ultra micro industry (Suzhou) company limited.
Processing aid
Because PVC material foaming posterior spiracle distribution and size have obvious heterogeneity, there is stress concentration in tension test and exist
Sake part, is easily broken, so needing to select appropriate processing aid and addition to ensure the equal of gas cell distribution and size
One, so as to improve tensile strength.
In the foaming PVC material, by weight including 2.4-12 part processing aids, preferably include the processing of 2.4-5.5 parts and help
Agent.The processing aid is selected from the group of one or more in acrylic processing aid and Tri- n -butyltin methacrylate processing aid
Close, preferably acrylic processing aid.Further, the acrylic processing aid is preferably methyl methacrylate
(MMA)/acrylate copolymer.Preferably, the weight average of methyl methacrylate (the MMA)/acrylate copolymer
Molecular weight (× 104) more than 250；In an embodiment of the present invention, model P-531A of the acrylic processing aid,
Supplier is beautiful sun (Shanghai) Management Co., Ltd of Rhizoma Sparganii.
Foaming agent
In the foaming PVC material, by weight including 1.2-6 part foaming agent, 1.5-3 part foaming agent is preferably included.It is described
Foaming agent is preferably CBA, and the CBA that specifically can be used is included but is not limited to：Azodicarbonamide, bicarbonate
The combination of one or more in the double benzene sulfonyl hydrazides of sodium, 4,4'- hydroxyls.More preferably organic chemistry foaming agent, excellent in the present invention one
In selecting embodiment, the organic chemistry foaming agent is azodicarbonamide, and is coordinated with suitable stabilizer, is reduced well
The decomposition temperature of azodicarbonamide so as to can use as foaming agent in PVC material system.
Antioxidant
In the foaming PVC material, antioxidant is used for the process for delaying or suppressing polymer to aoxidize, so as to prevent the old of polymer
Change and extend its service life.
In the foaming PVC material, by weight including 0.2-0.5 part antioxidant, 0.2-0.3 part antioxidant is preferably included.
The antioxidant can use the various antioxidant in this area, the antioxidant that specifically can be used to include but is not limited to：Antioxidant 1010 (four
[β-(3,5- di-tert-butyl-hydroxy phenyl) propanoic acid] pentaerythritol ester), irgasfos 168 (three (2,4- di-t-butyl) phosphorous acid
Phenyl ester), one or more in DLTP (thio-2 acid double lauryl) of combination.In a preferred embodiment,
The antioxidant is antioxidant 1010.
Lubricant
In the foaming PVC material, the effect of lubricant is the mobility for improving product in process, prevents interior in machine
Defect is produced because of adhesion, and the processability of material can be improved.
In the foaming PVC material, by weight including 0.2-2.4 part lubricants, those skilled in the art can be according to lubrication
The consumption of the different adjustment lubricants of the species, technique and use environment of agent.The lubricant can use the various lubricants in this area,
The lubricant that specifically can be used is included but is not limited to：The combination of one or more in stearic acid, oxidic polyethylene.In the present invention
In one preferred embodiment, lubricant is stearic acid.
Stabilizer
In the foaming PVC material, stabilizer plays a part of to delay its thermal decomposition, and while be engaged with foaming agent, plays
Reduce the effect of foaming agent decomposition temperature.
In the foaming PVC material, by weight including 1-8 part stabilizers, 1-6 part stabilizers, this area are preferably included
Technical staff can be according to technique and the consumption of the different adjustment plasticizers of use environment.The stabilizer include PVC heat stabilizer and
Acid-acceptor, preferred PVC heat stabilizer includes but is not limited to calcium stearate, zinc stearate, beta-diketon (stearoyl benzoyl
Methane), one or more in dibenzoyl methane of combination, preferred acid-acceptor includes but is not limited to brucite, the water
Talcum is preferably Mg4Al2(OH)12CO3·3H2O.In a preferred embodiment, the stabilizer include calcium stearate,
Zinc stearate, beta-diketon and brucite, the weight ratio of each component is：Calcium stearate, zinc stearate, beta-diketon and water
Talcum=0.1-10：0.1-10：0.1-10：0.1-10, preferably calcium stearate, zinc stearate, beta-diketon and brucite=0.4-0.8：
0.4-0.8：0.1-0.5：0.5-4, model HT-1 that the brucite is, supplier is Japanese Sakai KCC.
Antimildew and antibacterial agent
In the foaming PVC material, may also include such as antimildew and antibacterial agent 0.1-0.5 parts.The species of the antimildew and antibacterial agent does not have
Particular restriction, as long as not producing restriction to the goal of the invention of the present invention.The antimildew and antibacterial agent that specifically can be used includes but does not limit
In thiabendazole.
Further, the foaming PVC material carries out necessary control in preparation process to processing temperature, and foaming agent is will not
Decompose, its preparation method specifically includes following steps：
1) polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are mixed；
2) appropriate plasticizer mixed with step 1 resulting material at room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 70-90 DEG C；
In order to allow resin-oatmeal to absorb plasticizer well, so adding on a small quantity under just start room temperature (preferably 5-35 DEG C) state
Plasticizer absorbs by resin-oatmeal, when temperature is lifted to 80 DEG C or so all adds and allows resin-oatmeal in batch mixing pot remaining plasticizer
The time for having abundance absorbs mixing.
Those skilled in the art can according to the weight of the plasticizer being dividedly in some parts in practical situations set-up procedure 2 and step 3 ratio,
Preferably, the weight ratio preferably 1 of the plasticizer for being added in the step 2 and step 3：2-5.
4) processing aid is mixed with step 3 resulting material at 125-135 DEG C；
5) step 4 resulting material is cooled to into 90-110 DEG C, adds foaming agent and mix；
In whole material mixed process, the temperature of material system is less than 140 DEG C.
In the step 4 and 5, processing aid is mixed with step 3 resulting material, due to the mixed at high speed of batch mixing pot,
Material can heat up in mixed process, when temperature rises to 130-140 DEG C, be cooled to material by cooling down system (cooling water)
90-110 DEG C, add foaming agent and mix 3 minutes, system temperature is kept in mixed process at 90-110 DEG C.
6) step 5 resulting material is carried out into banburying, and by the material extruding pelletization obtained by banburying, obtains final product the foaming PVC material
Material.
In an embodiment of the present invention, the actual conditions of banburying is three sections of banburyings, is controlled with temperature and rotating speed, three sections of banburyings
Temperature be respectively 80-90 DEG C/30-40rpm, 100-110 DEG C/35-45rpm, 110-120 DEG C/30-40rpm, temperature during extruding pelletization
≤ 115 DEG C of degree, preferred temperature is 90-115 DEG C.
In an embodiment of the present invention, being blended in high speed batch mixing pot for each material is carried out, the concrete bar in each step, during mixing
Part is respectively：
1) polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are mixed；
2) appropriate plasticizer is mixed with step 1 resulting material at 5-35 DEG C；
3) remaining plasticizer is mixed with step 2 resulting material at 70-90 DEG C；
4) the weight ratio preferably 1 of the plasticizer added in the step 2 and step 3：2-5.
5) processing aid is mixed with step 3 resulting material at 125-135 DEG C, when system temperature rises to 130-140 DEG C
When, material is cooled to into 90-110 DEG C, add foaming agent and mix 3 minutes.
Refrigerator door seal provided by the present invention is prepared by the foaming PVC material extrusion molding, the foaming PVC material
In preparation process, azodicarbonamide does not decompose, when refrigerator door seal is prepared using the foaming PVC material extrusion molding
Azodicarbonamide reduces foaming.
Refrigerator door seal provided by the present invention can be prepared by the various extruders in this area by the foaming PVC material.Plus
During work, processing temperature is preferably 115-165 DEG C, and in an embodiment of the present invention, processing temperature is 140-158 DEG C.Ability
Field technique personnel can be (concrete such as different-diameter, the different processing temperature of extruder according to the difference of equipment, technique and use environment
Degree etc.), the time of staying is adjusted, to obtain suitable frothing percentage, the preferred frothing percentage of the refrigerator door seal is 13-33%.
The present invention further provides the preparation method of the refrigerator door seal, the refrigerator door seal by foaming PVC material extrusion into
Type is prepared.
Refrigerator door seal provided by the present invention is prepared by foaming PVC material, and the refrigerator door seal is by addition foaming agent at it
Inside introduces substantial amounts of microbubble, while material heat-proof quality is obviously improved, it is ensured that every mechanical property of material,
Suitable for the labyrinth and use environment of various refrigerator door seals.
The present invention furthermore provides purposes of the refrigerator door seal in freezer component preparation, and the component is preferably insulating assembly.
As described above, the present invention provides a kind of new refrigerator door seal, prepared by the foaming PVC material Jing extrusion moldings,
In Jing extruder strip of paper used for sealing molding, suitable frothing percentage is obtained by the time of staying and processing temperature control, effectively save society
Meeting resource, reduction cost, and the heat conductivity of door seal is decreased obviously, and still there is good mechanical property.
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by disclosed by this specification
Content understand easily the present invention other advantages and effect.The present invention can also be added by specific embodiments different in addition
To implement or apply, the every details in this specification can also be based on different viewpoints and application, in the essence without departing from the present invention
Various modifications and changes are carried out under god.
It should be clear that not concrete dated process equipment or device adopt conventional equipment or device in the art in the following example.
In addition, it is to be understood that one or more method and steps mentioned in the present invention do not repel before and after the combination step can be with
There is additive method step or additive method step can also be inserted between the step of these are specifically mentioned, unless otherwise stated；
It should also be understood that the combination annexation between one or more the equipment/devices mentioned in the present invention is not repelled setting in the combination
Can also there is other equipment/device before and after standby/device or can also insert it between these two equipment/devices for specifically mentioning
His equipment/device, unless otherwise stated.And, unless otherwise stated, the numbering of various method steps only differentiates various method steps
Convenient tool, rather than to limit the ordering of various method steps or limiting enforceable scope of the invention, its relativeness
It is altered or modified, in the case of without essence change technology contents, when being also considered as enforceable category of the invention.
Product information used in instantiation is as follows：
Polrvinyl chloride Ningbo Tai Su Chemical Co., Ltd.s, model S-70；
The big Japanese ink company of adipic acid kind polyester, model W-2310 adipic acid kind polyester；
Epoxy soybean oil Guangzhou Xin Jin dragon plastic additives company limited, model E-20；
Calcium Carbonate is vertical up to ultra micro industry (Suzhou) company limited, model LD-800；
Beautiful sun (Shanghai) Management Co., Ltd of acrylic processing aid Rhizoma Sparganii, model P-531A methyl methacrylate
(MMA)/acrylate copolymer；
Sakai KCC of brucite Japan, model HT-1；
Other raw materials are commercially available.
Embodiment 1
The preparation method of refrigerator door seal is as follows：
1) by the formula in table 1, polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in high speed batch mixing pot
Mixed；
2) appropriate plasticizer is mixed with step 1 resulting material after 60 ± 20 seconds in mixed at high speed, mixing temperature is room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 80 DEG C；
The weight ratio preferably 1 of the plasticizer added in the step 2 and step 3：4.
4) processing aid is mixed with step 3 resulting material at 130 DEG C；
5) in 135 DEG C of shutdown；
6) open cooling water to be cooled down, material is cooled to into 90-110 DEG C, add foaming agent and mix 3 minutes；(unexpanded product
Without this step)
7) resulting material is carried out into banburying, the actual conditions of banburying is three sections of banburyings, is controlled with temperature, respectively 85 DEG C
/ 35rpm, 105 DEG C/40rpm, 115 DEG C/35rpm, by the material obtained by banburying at 90-115 DEG C extruding pelletization；
Step 7 gained pellet is passed through into batten of the φ 20mm extrusions test systems for refrigerator door seal, processing temperature is 140-158 DEG C；
Extruder rotating speed：30rpm, the time of staying：2min.
Table 1
The above-mentioned batten for preparing is carried out into performance test, concrete outcome is as shown in table 2：
Tensile strength is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Elongation at break is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Proportion is carried out according to JIS K 7112A regulations；
Heat conductivity participates in calculating gained according to formula thermal diffusion coefficient, specific heat at constant pressure, proportion.
Table 2
Correlation formula：Heat conductivity=thermal diffusion coefficient * specific heat at constant pressure * proportions
Frothing percentage=unexpanded product proportion/foaming product proportion -1
Embodiment 2
The preparation method of refrigerator door seal is as follows：
1) by the formula in table 1, polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in high speed batch mixing pot
Mixed；
2) appropriate plasticizer is mixed with step 1 resulting material after 60 seconds ± 20 in DEG C mixed at high speed；
3) remaining plasticizer is mixed with step 2 resulting material at 80 DEG C；
The weight ratio preferably 1 of the plasticizer added in the step 2 and step 3：4.
4) processing aid is mixed with step 3 resulting material at 130 DEG C；
5) in 135 DEG C of shutdown；
6) open cooling water to be cooled down, material is cooled to into 90-110 DEG C, add foaming agent and mix 3 minutes；(unexpanded product
Without this step)
7) resulting material is carried out into banburying, the actual conditions of banburying is three sections of banburyings, is controlled with temperature, respectively 85 DEG C
/ 35rpm, 105 DEG C/40rpm, 115 DEG C/35rpm, by the material obtained by banburying at 90-115 DEG C extruding pelletization；
Step 7 gained pellet is passed through into batten of the φ 20mm extrusions test systems for refrigerator door seal, processing temperature is 140-158 DEG C；
Extruder rotating speed：30rpm, the time of staying：2min.
Table 3
The above-mentioned batten for preparing is carried out into performance test, concrete outcome is as shown in table 4：
Tensile strength is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Elongation at break is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Proportion is carried out according to JIS K 7112A regulations；
Heat conductivity participates in calculating gained according to formula thermal diffusion coefficient, specific heat at constant pressure, proportion.
Table 4
Correlation formula：Heat conductivity=thermal diffusion coefficient * specific heat at constant pressure * proportions
Frothing percentage=unexpanded product proportion/foaming product proportion -1
Embodiment 3
The preparation method of refrigerator door seal is as follows：
1) by the formula in table 1, polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in high speed batch mixing pot
Mixed；
2) appropriate plasticizer is mixed with step 1 resulting material after 60 ± 20 seconds in mixed at high speed, mixing temperature is room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 70 DEG C；
The weight ratio preferably 1 of the plasticizer added in the step 2 and step 3：2.
4) processing aid is mixed with step 3 resulting material at 125 DEG C；
5) in 135 DEG C of shutdown；
6) open cooling water to be cooled down, material is cooled to into 90-110 DEG C, add foaming agent and mix 3 minutes；(unexpanded product
Without this step)
7) resulting material is carried out into banburying, the actual conditions of banburying is three sections of banburyings, is controlled with temperature, respectively 80 DEG C
/ 30rpm, 110 DEG C/45rpm, 120 DEG C/40rpm, by the material obtained by banburying at 90-115 DEG C extruding pelletization；
Step 7 gained pellet is passed through into batten of the φ 20mm extrusions test systems for refrigerator door seal, processing temperature is 140-158 DEG C；
Extruder rotating speed：30rpm, the time of staying：2min.
Table 5
The above-mentioned batten for preparing is carried out into performance test, concrete outcome is as shown in table 6：
Tensile strength is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Elongation at break is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Proportion is carried out according to JIS K 7112A regulations；
Heat conductivity participates in calculating gained according to formula thermal diffusion coefficient, specific heat at constant pressure, proportion.
Table 6
| Pilot project | Unit | Unexpanded product | Foaming product | Test standard/equipment |
| Tensile strength | Mpa | 12.1 | 6.9 | JIS K 6723 6.3 |
| Elongation at break | % | 272 | 211 | |
| Proportion | - | 1.46 | 1.20 | JIS K 7112A |
| Thermal diffusion coefficient | mm2s-1 | 0.129 | 0.111 | Heat conductivity analyser |
| Specific heat at constant pressure | J-1gK-1 | 1.348 | 1.336 | DSC |
| Heat conductivity | Wm-1K-1 | 0.254 | 0.178 | - |
| Heat conductivity declines | % | - | 30 | - |
| Frothing percentage | - | - | 22 | - |
Correlation formula：Heat conductivity=thermal diffusion coefficient * specific heat at constant pressure * proportions
Frothing percentage=unexpanded product proportion/foaming product proportion -1
Embodiment 4
The preparation method of refrigerator door seal is as follows：
1) by the formula in table 1, polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in high speed batch mixing pot
Mixed；
2) appropriate plasticizer is mixed with step 1 resulting material after 60 ± 20 seconds in mixed at high speed, mixing temperature is room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 90 DEG C；
The weight ratio preferably 1 of the plasticizer added in the step 2 and step 3：5.
4) processing aid is mixed with step 3 resulting material at 135 DEG C；
5) in 140 DEG C of shutdown；
6) open cooling water to be cooled down, material is cooled to into 90-110 DEG C, add foaming agent and mix 3 minutes；(unexpanded product
Without this step)
7) resulting material is carried out into banburying, the actual conditions of banburying is three sections of banburyings, is controlled with temperature, respectively 90 DEG C
/ 40rpm, 100 DEG C/35rpm, 110 DEG C/30rpm, by the material obtained by banburying at 90-115 DEG C extruding pelletization；
Step 7 gained pellet is passed through into batten of the φ 20mm extrusions test systems for refrigerator door seal, processing temperature is 140-158 DEG C；
Extruder rotating speed：30rpm, the time of staying：2min.
Table 7
The above-mentioned batten for preparing is carried out into performance test, concrete outcome is as shown in table 8：
Tensile strength is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Elongation at break is carried out according to the regulations of JIS K 6,723 6.3, draw speed 200mm/min；
Proportion is carried out according to JIS K 7112A regulations；
Heat conductivity participates in calculating gained according to formula thermal diffusion coefficient, specific heat at constant pressure, proportion.
Table 8
Correlation formula：Heat conductivity=thermal diffusion coefficient * specific heat at constant pressure * proportions
Frothing percentage=unexpanded product proportion/foaming product proportion -1
In sum, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle and its effect of above-described embodiment only illustrative present invention, it is of the invention not for limiting.It is any to be familiar with this skill
The personage of art all can carry out modifications and changes under the spirit and the scope without prejudice to the present invention to above-described embodiment.Therefore, such as
Those of ordinary skill in the art completed under without departing from disclosed spirit and technological thought all etc.
Effect modifications and changes, should be covered by the claim of the present invention.
Claims (22)
1. a kind of refrigerator door seal, is prepared by foaming PVC material.
2. a kind of refrigerator door seal as claimed in claim 1, it is characterised in that the foaming PVC material, its raw material is by weight
Meter, including following component：
3. a kind of refrigerator door seal as claimed in claim 2, it is characterised in that the degree of polymerization of the polrvinyl chloride is 800-2500, excellent
Elect 1000-1300 as.
4. a kind of refrigerator door seal as claimed in claim 2, it is characterised in that the plasticizer is selected from adipic acid kind polyester, inclined benzene three
One kind or many in sour three monooctyl esters, epoxy soybean oil, DOTP, di-n-octyl sebacate, dioctyl adipate
The combination planted.
5. a kind of refrigerator door seal as claimed in claim 4, it is characterised in that the plasticizer is adipic acid kind polyester and epoxy soybean
The combination of oil, in the plasticizer, the weight ratio of adipic acid kind polyester and epoxy soybean oil is 1：0.1-1.5.
6. a kind of refrigerator door seal as claimed in claim 4, it is characterised in that the viscosity of the ethanedioic acid kind polyester for (25 DEG C,
Mpas) 2400-6000, proportion is (20/20 DEG C) 1.050-1.150, the epoxide number (%) 6.0 of epoxy soybean oil with
On, acid number (KOH mg/g) less than 0.5.
7. a kind of refrigerator door seal as claimed in claim 2, it is characterised in that the filler is Calcium Carbonate.
8. a kind of refrigerator door seal as claimed in claim 2, it is characterised in that the processing aid selected from acrylic processing aid and
The combination of one or more in Tri- n -butyltin methacrylate processing aid.
9. a kind of refrigerator door seal as claimed in claim 8, it is characterised in that the acrylic processing aid is methyl methacrylate
Ester (MMA)/acrylate copolymer, its weight average molecular weight (× 104) more than 250.
10. a kind of refrigerator door seal as claimed in claim 2, it is characterised in that the CBA is organic chemistry foaming agent.
11. a kind of refrigerator door seal material as claimed in claim 10, it is characterised in that the CBA is selected from azo diformazan
The combination of one or more in the double benzene sulfonyl hydrazides of amide, sodium bicarbonate, 4,4'- hydroxyls.
12. a kind of refrigerator door seals as claimed in claim 2, it is characterised in that the antioxidant is selected from antioxidant 1010, resists
The combination of one or more in oxygen agent 168, DLTP.
13. a kind of refrigerator door seals as claimed in claim 2, it is characterised in that the stabilizer is selected from calcium stearate, stearic acid
The combination of one or more in zinc, beta-diketon, brucite, rare-earth stabilizer, organic tin stabilizer, barium zinc stabilizer.
14. a kind of refrigerator door seals as claimed in claim 13, it is characterised in that the stabilizer includes calcium stearate, Hard Fat
Sour zinc, beta-diketon and brucite, the weight ratio of each component is：Calcium stearate, zinc stearate, beta-diketon and neatly
Stone=1-10：1-10：1-10：1-10.
15. a kind of refrigerator door seals as claimed in claim 2, it is characterised in that the raw material of the foaming PVC material is by weight
Part meter, is also included such as antimildew and antibacterial agent 0.1-0.5 parts.
16. refrigerator door seals as described in claim 2-15 any claim, it is characterised in that the foaming PVC material
Preparation method, comprises the steps：
1) polrvinyl chloride, filler, antioxidant, lubricant, stabilizer are mixed；
2) appropriate plasticizer mixed with step 1 resulting material at room temperature；
3) remaining plasticizer is mixed with step 2 resulting material at 70-90 DEG C；
4) processing aid is mixed with step 3 resulting material at 125-135 DEG C；
5) step 4 resulting material is cooled to into 90-110 DEG C, adds foaming agent and mix；
6) step 5 resulting material is carried out into banburying, and by the material extruding pelletization obtained by banburying, obtains final product the foaming PVC material
Material.
17. a kind of refrigerator door seals as claimed in claim 16, it is characterised in that added in the step 2 and step 3
The weight ratio preferably 1 of plasticizer：2-5.
18. a kind of refrigerator door seals as claimed in claim 16, it is characterised in that in the step 6, the actual conditions of banburying
For three sections of banburyings, it is controlled with temperature and rotating speed, respectively 80-90 DEG C/30-40rpm, 100-110 DEG C/35-45rpm,
110-120℃/30-40rpm。
A kind of 19. refrigerator door seals as claimed in claim 16, it is characterised in that the temperature in the step 6, during extruding pelletization
Spend for 90-115 DEG C.
20. a kind of refrigerator door seals as claimed in claim 1, it is characterised in that the refrigerator door seal is by the foaming PVC material
Material extrusion molding is prepared, during refrigerator door seal molding, by controlling the time of staying and processing temperature control foaming
Rate.
21. a kind of refrigerator door seals as claimed in claim 20, it is characterised in that the frothing percentage of the refrigerator door seal is 13-33%.
22. a kind of refrigerator door seals as claimed in claim 20, it is characterised in that processing temperature is 115-165 DEG C.
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| CN109931744A (en) * | 2017-12-19 | 2019-06-25 | Aqua株式会社 | Seal strip for refrigerator door |
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|---|---|
| CN106609014B (en) | 2019-03-26 |
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