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Thermoplastic polyurethane elastomer (TPE) door seal for refrigerator and freezer and preparation method thereof

An elastic and body door technology, applied in the field of thermoplastic elastomers, door seals and their preparation, can solve problems such as shortening service life, aging, and increasing energy consumption of products, and achieves the advantages of prolonging service life, improving weather resistance and improving low temperature resistance. Effect

Inactive Publication Date: 2012-07-04
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the door seals for refrigerators and freezers on the market are made of soft PVC materials. Due to the influence of the performance of PVC materials, there are the following shortcomings in the use and installation of door seals: (1) PVC door seals have poor low temperature resistance and are significantly affected by environmental temperature changes. The temperature change in summer and winter has a great impact on the hardness of PVC door seals, resulting in poor sealing performance of the door seals, which makes the energy consumption of the product Increase; (2) The anti-migration performance of door seals is poor: due to the addition of plasticizers to PVC materials during the manufacturing process, plasticizers are easy to migrate to ABS / PS blister parts, and are easy to corrode refrigerator liner materials. Has a certain carcinogenic effect; (3) Not environmentally friendly: PVC is a halogen-containing compound, which is classified as a non-environmentally friendly material internationally. It is not environmentally friendly during processing and use; and PVC will lose about 30% of its performance during recycling. , is not conducive to recycling; (4) Its anti-aging performance is poor: because soft PVC is composed of PVC resin powder, various plasticizers and auxiliary materials, as the use time prolongs, PVC door seals will become hard, discolored, and aging , thereby affecting its appearance and sealing, shortening the service life
[0003] In order to solve the above technical problems, there are related technologies that apply TPE materials to door seals for refrigerators and freezers. The existing TPE formula system is mainly composed of SEBS+white mineral oil+PP+PE+calcium carbonate+auxiliary, white ore The main role of oil in the formulation system is to reduce the viscosity of the melt, improve the fluidity of the melt, adjust the hardness of the product, and improve the processing performance of SEBS; another component of the TPE formulation system is PP (polypropylene) material The main function is to adjust the hardness and melting index of the product, improve the processability of the entire formula system and the formability of the door seal. If there is no PP, adding SEBS+white mineral oil+PE to make refrigerator door seals is difficult to form

Method used

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  • Thermoplastic polyurethane elastomer (TPE) door seal for refrigerator and freezer and preparation method thereof
  • Thermoplastic polyurethane elastomer (TPE) door seal for refrigerator and freezer and preparation method thereof
  • Thermoplastic polyurethane elastomer (TPE) door seal for refrigerator and freezer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare TPE elastomer door seals as follows:

[0043] First, prepare TPE elastomer particles:

[0044] see figure 1 As shown, according to the mass weighing of each component in Example 1 in Table 1, put various raw materials into a high-speed mixer and mix them evenly, then unload the materials and store them for 2 hours, and then put them into a double mixer with L / D≥48. In the screw extruder, it is extruded and granulated to make TPE elastomer granules. After cooling, it is cut into granules and packaged for storage.

[0045] Then, prepare the TPE elastomer door seal:

[0046] see figure 2 As shown, first, the TPE elastomer particles prepared above are extruded through a single-screw extruder to extrude the door seal rubber sleeve. After cooling and shaping, they are cut according to the length requirements and stored for 24 hours to make a TPE elastomer door. Sealing sleeve, spare.

[0047]Then, the TPE elastomer door seal rubber sleeve prepared above is cut a...

Embodiment 2

[0051] According to the method as in Example 1, TPE elastomer door seals were prepared by weighing the components in Example 2 in Table 1 below. And measure its index according to the method identical with embodiment 1.

[0052] The difference between this embodiment and Example 1 is that the antioxidant is two (2.4-di-tert-butylphenyl) pentaerythritol diphosphite, and the lubricant includes internal lubrication and external lubrication, selected from stearylamide , ethylene bis stearamide, erucamide, stearic acid, calcium stearate, the pigments are phthalocyanine green, phthalocyanine blue, titanium dioxide, carbon black and the like.

Embodiment 3

[0054] According to the method as in Example 1, TPE elastomer door seals were prepared by weighing the components in Example 3 in Table 1 below. And measure its index according to the method identical with embodiment 1. The difference between this embodiment and Example 1 is that the antioxidant is β (3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, and the lubricant includes internal lubrication and external lubrication. Lubricating, selected from stearamide, ethylene bisstearamide, erucamide, stearic acid, calcium stearate, the pigment is phthalocyanine green, phthalocyanine blue, titanium dioxide, carbon black and the like.

[0055] The content of each raw material and the main performance indicators of the TPE elastomer door seal made in Table 1 embodiment 1-3

[0056]

[0057] Table 2 Standards for the main performance indicators of TPE elastomer door seals

[0058] Test items

unit

technical indicators

Testing Standard

density

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Abstract

The invention discloses a thermoplastic polyurethane elastomer (TPE) door seal for a refrigerator and a freezer and a preparation method thereof. The TPE door seal is a TPE door seal rubber sleeve which is manufactured by adopting the following raw materials by mass: 15% to 50% of SEBS, 20% to 50% of white mineral oil, 10% to 48% of polypropylene, 10% to 45% of ethylene vinyl acetate (EVA), 5% to 25% of calcium carbonate, 0.1% to 0.6% of antioxygen and 0.1% to 0.6% of lubricant. The EVA material is introduced into a TPE door seal formula system, so that weather resistance, aging resistance and adhesiveness of the materials can be improved. The EVA material is added into a blending system of SEBS, white mineral oil, propene polymer and calcium carbonate, and low temperature resistance of products can be improved by utilizing good low temperature resistance of the EVA material. Compared with the polyvinyl chloride (PVC) material, the TPE material of the blending system of the SEBS, the white mineral oil, the propene polymer (PP), the EVA and the calcium carbonate has better low temperature resistance, and the problems of gap lighting, dropping and damage of the seal of the refrigerator and the freezer caused by the fact that the PVC material is poor in cold resistance and low temperature impact strength and the like can be resolved.

Description

technical field [0001] The invention relates to the technical field of door seals for refrigerators and freezers, in particular to a door seal made of TPE and a preparation method thereof. The material of the TPE door seal belongs to SEB S / PP blended thermoplastic elastomer. Background technique [0002] At present, most of the door seals for refrigerators and freezers on the market are made of soft PVC materials. Due to the influence of the performance of PVC materials, there are the following shortcomings in the use and installation of door seals: (1) PVC door seals have poor low temperature resistance and are significantly affected by environmental temperature changes. The temperature change in summer and winter has a great impact on the hardness of PVC door seals, resulting in poor sealing performance of the door seals, which makes the energy consumption of the product Increase; (2) The anti-migration performance of door seals is poor: due to the addition of plasticizers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L23/12C08L23/08C08K5/01C08K3/26
Inventor 王立锋谭伟宏王泽方林志勇于静静张亚兵
Owner HAIER GRP CORP
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