Low-shrinkage polyester film

Abstract

The invention provides a low-shrinkage polyester film, and relates to the technical field of polyester films, the low-shrinkage polyester film is prepared from the following raw materials by weight: 70-85% of a polyester raw material, 2-10% of hydroxyapatite, 1-5% of a phosphorus-containing flame retardant, 1-5% of a metal organic salt, 1-5% of an adhesive, and 1-5% of a catalyst. The flame retardant is prepared from, by weight, 2-5% of a phosphorus-containing flame retardant, 5-15% of metal organic salt, 2-5% of an adhesive and 2-5% of a catalyst. According to the low-shrinkage polyester film, the hydroxyapatite and the metal organic salt are added into traditional preparation materials, and after the hydroxyapatite and the metal organic salt are fully fused with other preparation materials through the rigidity performance of the two materials, the low-shrinkage polyester film can have the higher rigidity coefficient and the low-shrinkage property; and convenience is provided for shaping work in actual use, the partition protection function is improved, and the functions are more comprehensive.

Description

technical field [0001] The invention relates to the technical field of polyester films, in particular to a low shrinkage rate polyester film and a preparation method thereof. Background technique [0002] In polyester film, it is a colorless, transparent and glossy film with excellent performance, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and preservation performance. However, the polyester film prepared in the market, due to the high shrinkage rate and insufficient rigidity coefficient at the weak position, has an impact on the protective performance of the polyester film itself and needs to be improved. [0003] Chinese Patent No. CN106589331B discloses the preparation method of polyester film, the polyester of which the film is made includes the following components: terephthalic acid, one or more other aromatic diacids, propylene glycol and one or more other The diol comp...

AI Technical Summary

Problems solved by technology

[0002] In polyester film, it is a colorless, transparent, glossy film with excellent performance, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and freshness preservation performance. It is commonly used However, the polyester film prepared on the market has too high a shrinkage rate and insufficient rigidity coefficient at the weak position, which affects the protective performance of the polyester film itself and needs to be improved.

[0003] Chinese Patent No. CN106589331B discloses a method for preparing a polyester film. The polyester used to make the film includes the following components: terephthalic acid, one or more than two aromatic diacids, propylene glycol, and one or more than two other Diol, comprising the following steps: raw material, catalyst, esterification reaction is carried out under the conditions of esterification reaction temperature of 220-300 ° C and esterification reaction pressure of 0.1-0.5 MPa to obtain a prepolymer, and the obtained prepolymer is obtained. The precondensation reaction temperature is 245 ~ 265 ℃, and the precondensation reaction pressure is 300 ~ 1000Pa. The technical scheme of precondensation under vacuum conditions solves this problem well and can be used to produce poly(trimethylene terephthalate) with low crystallization rate Ester film, the polyester film prepared by this method can slow down the crystallization rate of polytrimethylene terephthalate film, but the shrinkage coefficient of the finished product is too high and needs to be improved

[0004] Chinese Patent No. CN112300374A discloses a method for preparing a low crystal point polyester film. The process mainly includes the following steps: (1) Send the bright polyester chips prepared with a new type of titanium catalyst into three-layer co-extrusion Biaxial stretching equipment, extruded and melted at 260-290°C; (2) The melt is quenched below 35°C to produce PET sheets; (3) The cast PET sheets are preheated at 65-120°C for longitudinal stretching and Cooling at a temperature below 30°C; (4) The sheet is then preheated at 90-115°C for transverse stretching and 160-250°C for crystallization; (5) After traction, waste edges are removed, thickness and quality are inspected, and then winding And curl, although the crystal point of the polyester film prepared by this method is low, it also has the problem of high shrinkage coefficient, which will lead to the problem of insufficient rigidity coefficient of the polyester film at the weak point, which needs to be improved

Images