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Method for preparing polyurethane coating agent for artificial chamois leather

A technology of polyurethane coating and artificial suede, which is applied in the fields of textiles, papermaking, fiber treatment, etc. It can solve the problems such as the difficulty in preparing polyurethane solutions, and achieve the effects of good air and moisture permeability, easy sanding, and full hand feeling

Inactive Publication Date: 2012-04-18
SUZHOU FANGYOU NEW MATERIAL
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Problems solved by technology

[0002] There are two synthetic methods of polyurethane coating agent for artificial suede. One is to dissolve thermoplastic polyurethane elastomer in a suitable solvent to prepare a solution. The content and viscosity of the polyurethane solution for wet coating can meet the requirements of use at the same time; the other is to directly synthesize the polyurethane coating agent by the solution method, and the solution method has strict requirements on the solvent

Method used

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Embodiment Construction

[0009] The technical solutions of the present invention will be described in detail below in conjunction with embodiments.

[0010] The preparation method of the polyurethane coating agent for artificial suede of the present invention includes the following steps:

[0011] Preparation of castor oil polyester polyols——prepared by polycondensation reaction of castor oil, adipic acid and trimethylolpropane under nitrogen protection at 180-220℃. The reaction can be controlled by the change of the acid value of the system over time;

[0012] Castor oil polyester polyol dehydration-add the metered castor oil polyester polyol to a reactor equipped with stirring, thermometer, vacuum system and heating system, heat up to 110-120°C, and vacuum (vacuum is 1.33 -4.0kPa), after dehydration for 2-3 hours, cool to 40-50℃ for later use;

[0013] Solvent pretreatment-industrial grade DMF, its water content is generally about 0.1%, and in the polyurethane synthesis process, water content is one of its ...

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Abstract

The invention discloses a method for preparing a polyurethane (PU) coating agent for artificial chamois leather. The method comprises the following steps of: mixing dehydrated castor oil polyester polyol, dimethyl formamide (DMF), a chain extender 1,4-butanediol and a T12 catalyst, maintaining the temperature of an obtained solution to be 50 DEG C, adding molten and metered methylene diphenyl diisocyanate (MDI), raising the temperature to 85 DEG C step by step, keeping the temperature and reacting for 3 hours, and adding a terminator, namely methanol to terminate the reaction to obtain a solvent type PU solution. Therefore, the polyurethane coating agent prepared by the method is suitable for coating the artificial chamois leather and has the advantages of high thermal stability and plumphandfeel, coating micropores are uniform, and the artificial chamois leather can be emerized easily; meanwhile, the coated artificial chamois leather has high air permeability and moisture permeability, and excellent appearance and handfeel.

Description

Technical field [0001] The invention relates to a method for preparing 4. 4-dichlorodiphenyl sulfone, in particular to a method for preparing 4. 4-dichlorodiphenyl sulfone after sulfonating chlorobenzene with sulfur trioxide. Background technique [0002] There are two synthetic methods for the polyurethane coating agent for artificial suede. One is to dissolve the thermoplastic polyurethane elastomer in a suitable solvent to prepare a solution. It is relatively simple to prepare a polyurethane coating agent solution by this method, but it is difficult to obtain a solid solution. The content and viscosity of the polyurethane solution for wet coating meet the requirements of use at the same time; the other is to directly synthesize the polyurethane coating agent by the solution method, which has strict requirements on the solvent. Summary of the invention [0003] In view of the shortcomings of the prior art, the present invention provides a method for preparing a polyurethane coat...

Claims

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Application Information

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IPC IPC(8): C08G18/68C08G18/32D06M15/572
Inventor 钱华张林荣
Owner SUZHOU FANGYOU NEW MATERIAL
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