A high temperature resistant microporous film material and its production process

Abstract

The invention discloses a high-temperature-resistant microporous film material and a production process thereof. The raw materials are 50-60% paraffin oil, 15-25% polypropylene, 10-20% polyethylene, 5-20% polyethylene, and 9% modified additives and 3-7% benzoyl peroxide, each raw material in the modified additives is respectively 35-65% ethanol, 10-20% triphosphite by weight percentage ester, 5-15% of 2,6-di-tert-butyl-p-cresol, 10-20% of phosphoric acid ester and 5-15% of melamine, the present invention can make the product The high temperature resistance is improved, and the phosphate ester in the auxiliary agent is modified to make the product have a flame-retardant effect, and then the triphosphite and 2,6-di-tert-butyl-p-cresol are added in the auxiliary agent through modification The combined action of the product can improve the oxidation resistance of the product, and then according to the biaxial stretching treatment-solvent extraction treatment-cutting and shaping treatment, the microporous structure of the product is stable, the pore size is uniform, and the air permeability is better, which is suitable for large-scale promotion and use.

Description

technical field [0001] The invention relates to the technical field of microporous film materials, in particular to a high temperature resistant microporous film material and a production process thereof. Background technique [0002] Microporous film material is a kind of porous film material with a pore diameter between 5.0nm and 1.0mm. While maintaining the circulation of water vapor, it can filter all dust particles including germs to achieve the effect of purification and ventilation, and is widely used in the fields of pharmaceuticals, biochemistry, microelectronics and laboratory consumables. [0003] However, in the existing microporous film materials, the overall shrinkage is often caused by the high working temperature, the high temperature resistance is weak, and it does not have the effect of flame retardancy. It is easily affected by the temperature and spontaneous combustion occurs, which in turn causes In dangerous situations such as fire, and under long-term...

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Problems solved by technology

[0005] The object of the present invention is to provide a high temperature resistant microporous film material and its production process. By adopting the roller cooling method in which the cooling medium is air, and the cooling rate is controlled at 30-60 degrees per second, the polypropylene in the mixture can be The phase separation rate between polyethylene and polyethylene is gradually slowed down, which improves the melt rupture temperature and mechanical properties of the prepared base film, and the modified additives in the mixture contain phosphate ester, which will decompose when heated. It decomposes into phosphorus oxyacids, and then catalyzes the dehydration of hydroxyl-containing compounds into charcoal to form a carbonized layer with a more stable structure on the surface. The formation of the carbonized layer can inhibit the transfer of heat and the diffusion of oxygen, thereby achieving the effect of flame retardancy. In addition, the modified additives in the mixture contain triphosphite and 2,6-di-tert-butyl-p-cresol, which can continuously absorb the active free radicals produced by chemical bond breakage due to ultraviolet rays, radiation or other conditions. It makes it difficult to combine with oxygen and cause further damage due to chain reaction afterwards, improves the oxidation resistance of the microporous film material, effectively solves the problem of overall shrinkage caused by too high working temperature, high temperature resistance The ability is weak, and it does not have the effect of flame retardancy and poor oxidation resistance;

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