High-solid content polyurethane resin composition and preparation method thereof

A technology of polyurethane resin and composition, applied in the field of polyurethane resin composition, which can solve problems such as inability to use synthetic leather coating process, unstable product system, solid crystallization, etc., and achieve the effect of moderate hardness, good elasticity and less solvent

Active Publication Date: 2009-12-30
XUCHUAN CHEM SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the production process of the prior art, the chain extender is generally directly added to the reaction mixture that completes the step of synthesizing the prepolymer, and the chain extension reaction occurs rapidly after stirring. If the content of the prepolymer is too high or the amount of solvent is too small , it is easy to cause curing during the chain extension reaction, and the obtained pol

Method used

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Examples

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Embodiment Construction

[0022] The following are specific examples of the present invention to further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

[0023] According to the raw material formula of the high-solid content type polyurethane resin composition of the present embodiment, it is as follows by weight: polyethylene glycol butylene glycol adipate diol (molecular weight 2000) 25 parts, polytetrahydrofuran diol (molecular weight 1000) 45 parts Parts, 4 parts of ethylene glycol, 21 parts of toluene diisocyanate (T-80), 5 parts of ethyl acetate.

[0024] Among them, the preparation method of polyethylene glycol butanediol adipate diol is as follows: add ethylene glycol, butanediol, and adipic acid to the reaction kettle in sequence, turn on the stirring, start to heat up, and raise the temperature to 135-140°C Keep constant temperature for 1 hour to stabilize the dehydration rate (through the rectification tower, the tempera...

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Abstract

The invention relates to a polyurethane resin composition and a preparation method thereof. Formula of raw materials of the composition expressed by weight percentage comprises: polyglycol butylene glycol adipate diol as polyester polylol, polytetrahydrofuran diol as polyether glycol, ethylene glycol as a chain-extension agent, toluene diisocynate as polyisocyanate, and ethyl acetate as solvent; during the process of synthesizing and preparing the polyurethane resin composition, ethanol solution of hydrogen chloride as a sealer is added after pre-polymer is synthesized and before the chain-extension agent is added for chain extension reaction. The chain extension reaction is suspended and restrained by the sealer, so no curing happens during the preparation of the polyurethane resin composition in the technical scheme, the viscosity is low, fluidity is good, and coating process for preparing synthetic leather is not affected; on the other hand, the product system is easy to store for good stability, and no crystallization during storage.

Description

technical field [0001] The invention relates to a polyurethane resin composition. Background technique [0002] Since the development of synthetic leather products, PVC products have been gradually replaced by polyurethane leather (PU leather), and almost all high-grade leather is made of polyurethane resin. Polyurethane resins have been widely used in various products in the leather industry. [0003] The production process of polyurethane synthetic leather is usually a sheet-like product formed by laminating the prepared polyurethane resin composition on non-woven fabric, woven fabric or woven fabric. Polyurethane resin surface. The surface layer is mainly used for decoration and to achieve the effect of imitating natural leather. [0004] In the above lamination process, firstly, the solution of the polyurethane resin composition is coated on the release paper or directly on the leather surface, and then dried in an oven. The solvent in the solution of the resin compos...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/12
Inventor 江平吕华波印实周源
Owner XUCHUAN CHEM SUZHOU
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