East China University of Science and Technology

Kunshan Tianyang Hot Melt Adhesive Co., Ltd

Shanghai Tianyang Hot Melt Adhesive Co., Ltd

Fangqun Wu

Zhelong Li

Zuoxiang Zeng

Wanyu Zhu

Heji Lei

A method for preparation of a high-viscosity polyester hot-melt adhesive with a partially sensitive viscosity-temperature property is disclosed, including the steps of: i) subjecting terephthalic acid, isophthalic acid, dodecanedioic acid, adipic acid, butanediol, dipropylene glycol and hexanediol to an esterification reaction in the presence of tetrabutyl titanate serving as a catalyst; and ii) adding an antioxidant to a product resulting from step i) to conduct a polycondensation reaction under a reduced pressure so as to obtain the high-viscosity polyester hot-melt adhesive which has a low melting point of 130&#xb0; C.-135&#xb0; C. and a partially sensitive viscosity-temperature property.

Method for preparing polyester hot melt adhesive with high viscosity and locally sensitive viscosity-temperature property

A polyester/glyoxalated polyvinyl alcohol semi-interpenetrating polymer network hot-melt adhesive and preparation method therefore, mainly includes the steps of: 1) transesterification of certain amounts of dimethyl terephthalate and another dibasic ester with 1,4-butanediol and other diols in the presence of an organotin catalyst under a nitrogen atmosphere in a reactor, completed upon the amount of distillation of a monohydric alcohol byproduct reaching greater than 95% of the theoretical amount; 2) after the temperature is maintained for a period of time, adding in a stabilizer and a polycondensation catalyst and incrementally increasing the temperature to trigger a polycondensation reaction under a reduced pressure to produce particles of a copolymer, and freezing and pulverizing the copolymer particles to produce a powder of a copolyester; 3) uniformly blending a polyvinyl alcohol/glyoxal mixture with the powder produced in step 2) at ambient temperature to produce the target product. The product is capable of forming an internal semi-interpenetrating network at application temperatures.

Methods for preparation of polyester/glyoxalated polyvinyl alcohol semi-interpenetrating polymer network hot-melt adhesive

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Shanghai, China

Fangqun Wu