Tetrahydrophthalic anhydride (THPA，四氢苯酐)

说 明 THPA是由马来酸酐和1,3-丁二烯经由Diels-Alder缩合反
[Description] 应而成，主要作为不饱和树脂和醇酸树脂的改质剂，可
改善树脂的空干性、光泽性及密著性，提高制品品质。
THPA is produced by Diels-Alder condensation with maleic anhydride and 1,3-butadiene. THPA is used mainly as a modifier for unsaturated polyester and alkyd resin to replace part of phthalic anhydride. It can improve the quality of resins and particularly their reactivity in the prescnce of air and their light fastness.

规 格

[Specification] 熔融色相(Molten color) less than 70 APHA
凝固点(Solidification point) More than 100 oC
残酸量(Free acid content) Less than 1.0 wt%
纯度(Purity) More than 99.5 wt%

物 性
[Physical properties] 化学式(Chemical formula) C8H8O3
构造式(Structural formula)
分子量(Molecular weight ) 152.2
比重(Specific gravity at 140oC) 1.147
闪火点(Flash point) 157 oC
沸点(Boiling point at 760 mmHg) 290 oC
THPA具有潮解性，贮存时应远离水气，容器开封后，应尽快使用。
THPA is hydroscopic and should be protected from light and moisture.

包 装

[Packing] THPA包装有25公斤袋装及500公斤太空包装
Available in flakes packed normally in 25 kg bags or 500kg jumbo bags.

用 途

[Usage] 1.醇酸树脂的改质剂，可提高树脂的密著性、弹力性、光 泽及耐湿性等。

2.不饱和聚酯树脂的改质剂，使树脂更具有空气硬化性、密著性及耐水性等特性。
As a modifier for unsaturated polyester and alkyd resin.