Refrigerator door seal, preparation method and application thereof
A technology for refrigerator doors and PVC materials, which is applied in applications, household appliances, household refrigeration devices, etc., can solve the problems of high thermal conductivity, poor elasticity, and high energy consumption of seal materials.
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[0072] Further, the processing temperature of the foamed PVC material must be controlled during the preparation process, and the foaming agent will not decompose. The preparation method specifically includes the following steps:
[0073] 1) Mix polyvinyl chloride, filler, antioxidant, lubricant and stabilizer;
[0074] 2) mixing an appropriate amount of plasticizer with the material obtained in step 1 at room temperature;
[0075] 3) Mixing the remaining plasticizer with the material obtained in step 2 at 70-90°C;
[0076] In order to allow the resin powder to absorb the plasticizer well, add a small amount of plasticizer at room temperature (preferably 5-35°C) to allow the resin powder to absorb, and when the temperature rises to about 80°C, plasticize the remaining Add all the agents into the mixing pot so that the resin powder has enough time to absorb and mix.
[0077] Those skilled in the art can adjust the weight ratio of the plasticizer added in batches in step 2 and ...
Embodiment 1
[0108] The preparation method of the refrigerator door seal is as follows:
[0109] 1) According to the formula in Table 1, polyvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in the high-speed mixing pot and mixed;
[0110] 2) After mixing at high speed for 60±20 seconds, mix an appropriate amount of plasticizer with the material obtained in step 1, and the mixing temperature is room temperature;
[0111] 3) Mix the remaining plasticizer with the material obtained in step 2 at 80°C;
[0112] The weight ratio of the plasticizer added in step 2 and step 3 is preferably 1:4.
[0113] 4) Mix the processing aid with the material obtained in step 3 at 130°C;
[0114] 5) Stop at 135°C;
[0115] 6) Turn on the cooling water for cooling, cool the material to 90-110°C, add foaming agent and mix for 3 minutes; (no such step for unfoamed products)
[0116] 7) The obtained material is banburyed, and the specific conditions of banburying are three-stage banburying,...
Embodiment 2
[0132] The preparation method of the refrigerator door seal is as follows:
[0133] 1) According to the formula in Table 1, polyvinyl chloride, filler, antioxidant, lubricant, stabilizer are added in the high-speed mixing pot and mixed;
[0134] 2) After mixing at high speed for 60 seconds ± 20 °C, mix an appropriate amount of plasticizer with the material obtained in step 1;
[0135] 3) Mix the remaining plasticizer with the material obtained in step 2 at 80°C;
[0136] The weight ratio of the plasticizer added in step 2 and step 3 is preferably 1:4.
[0137] 4) Mix the processing aid with the material obtained in step 3 at 130°C;
[0138] 5) Stop at 135°C;
[0139] 6) Turn on the cooling water for cooling, cool the material to 90-110°C, add foaming agent and mix for 3 minutes; (no such step for unfoamed products)
[0140] 7) The obtained material is banburyed, and the specific conditions of banburying are three-stage banburying, controlled by temperature, which are respe...
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