custom size dtf paper pet film sheet roll's wear resistance, bending fatigue resistance, high elasticity, can be used in a variety of auto parts, Such as for shift rod handle, all kinds of coupling sleeve and washer, all kinds of wire harness connector, spiral telescopic wire, cable sheath, tooth belt, steering rod sheath and gasket, suspension joint hinge, hydraulic pneumatic, suspension diaphragm, shock absorber, spring limit block, etc., can also be used with other plastics or rubber composite, Used in car bumpers, airbags, dust cover and other parts.

custom size dtf paper pet film sheet roll contains many polar groups, it is easy to absorb moisture in the air. On the one hand, the absorbed water acts as a plasticizer, which will lead to a decrease in the physical properties of custom size dtf paper pet film sheet roll, but this effect is reversible. If the custom size dtf paper pet film sheet roll is fully dried, the absorbed water can be removed from the custom size dtf paper pet film sheet roll, and its physical property can still be restored to the level before water absorption.

On the other hand, under certain conditions, it will also degrade, and this process is irreversible, depending on the structure of the soft segment. The hydrolysis resistance of polyether structure in soft segment is stronger than that of polyester structure. Therefore, improving the water resistance of custom size dtf paper pet film sheet roll is mainly to improve the water resistance of polyester type custom size dtf paper pet film sheet roll, generally speaking, there are several methods:

First, improve the polyester structure

The hydrolysis stability of polyester can be improved by increasing the carbon chain length. Branched chains or rigid ring structures are introduced into the polyester structure. The hydrolytic stability can also be improved. For adipate series polyesters, polyesters synthesized with hexanediol or neopentanediol have better water resistance than those synthesized with ethylene glycol or butanediol.

Because the soft segment of polyolefin diol can not provide the strong electronegative elements required to form hydrogen bonds, the custom size dtf paper pet film sheet roll synthesized has excellent hydrolysis resistance, but poor oxidation resistance due to the existence of double bonds in the molecule. custom size dtf paper pet film sheet roll synthesized with polycaprolactone diol and polycarbonate diol has better water resistance than polyadipate series, but the cost is much higher.

· The polyester synthesized by a certain proportion of adipic acid and terephthalic acid has good water resistance;

· Introducing a certain proportion of polyether into the polyester structure can be random copolymerization or block copolymerization of polyether ester can make its water resistance greatly improved;

· In the process of synthesizing polyester, controlling its acid value below 0.1 can also maintain its basically stable performance.

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