Magnetic door seal made of thermoplastic polyolefin materials and for refrigerator and freezer and preparation method thereof

Abstract

The invention provides a magnetic door seal made of thermoplastic polyolefin materials and for a refrigerator and a freezer. The magnetic door seal comprises a thermoplastic polyolefin elastomer door seal rubber sleeve composed of polyolefin elastomer (POE) plastic, naphthenic oil, polypropylene, modifier, lubricant and filler. A preparation method is further provided. A product of the magnetic door seal is low temperature resistant and excellent in performance, and can be used even under -50 DEG C. Simultaneously, shore hardness is basically not affected by temperature change and is less affected by environment. The rubber sleeve is flexible and good in resilience under the -15 DEG C. The door seal and the method improve sealing performance of the door seal rubber sleeve, greatly reduce product energy consumption, improve mechanical performance of the door seal and prolong service life of the door seal.

Description

[0001] technical field [0002] The invention belongs to the technical field of magnetic door seals for refrigerators, freezers and other electrical appliances, in particular to a magnetic door seal made of thermoplastic polyolefin for refrigerators and freezers and a preparation method thereof. [0003] technical background [0004] Due to sealing requirements, magnetic door seals are used for the opening and closing of doors such as refrigerators and freezers. Most of the door seal materials are made of soft PVC and magnetic strips. Affected by the characteristics of PVC material itself, there will be the following deficiencies in the process of use and installation: (1) During the production and synthesis of PVC rubber sleeves, hydrogen chloride gas is easily decomposed under high temperature conditions, which has a lot of harm to human body and equipment. At the same time, the hydrogen chloride gas produced is a good catalyst for the degradation of PVC, which accelerat...

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Problems solved by technology

Affected by the characteristics of PVC material itself, there will be the following deficiencies in the process of use and installation: (1) During the production and synthesis of PVC rubber sleeves, hydrogen chloride gas is easily decomposed under high temperature conditions, which has a lot of harm to human body and equipment. At the same time, the hydrogen chloride gas produced is a good catalyst for the degradation of PVC, which accelerates the degradation of PVC and affects the service life of PVC rubber sleeves; (2) The low temperature resistance is poor, and PVC rubber sleeves tend to become brittle under low temperature conditions. Moreover, the PVC rubber sleeve is obviously affected by the change of ambient temperature, and the hardness changes greatly with the temperature difference; (3) The anti-aging performance is poor. Although the PVC rubber sleeve contains stabilizers, as time goes on, the PVC door seal rubber sleeve will be damaged There are different degrees of hardening, discoloration and aging, which greatly shorten the service life of PVC rubber sleeves; (4) Generally, PVC rubber sleeves have low elongation at break and low strength, which greatly affects the door opening and closing test of refrigerators , which shortens the service life; (5) PVC is a halogen-containing plastic material, which is recognized as a non-environmental protection material internationally; (6) Due to the poor elasticity of PVC, it is easy to deform during processing, transportation and use, causing sealing Lack of tightness, leakage of cooling, resulting in greatly increased energy consumption

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