Temperature-sensitive hydrophilic cross-linking crystal type polyurethane coating agent, preparation method thereof and application thereof

A polyurethane coating, cross-linking crystallization technology, applied in polyurea/polyurethane coatings, coatings, textiles and papermaking, etc., can solve the problems of poor response accuracy and sensitivity, achieve high response accuracy and response sensitivity, good waterproof, The effect of good moisture permeability

Inactive Publication Date: 2010-05-19
广东广纺检测技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the temperature-sensitive PU materials that have been developed generally have the problem of poor response accuracy and sensitivity to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] (1) Preparation of sample Cast the synthesized solvent-based polyurethane on a glass plate, and perform the following heat treatment: dry in a vacuum oven at 80°C, and then bake at 150°C for 3 minutes. The thickness of the film is about 0.1~1.0mm.

[0037] (2) Thermal performance (DTA / DSC) test of polyurethane coating agent and determination of its transition temperature

[0038]DSC test refers to GB / T 17594-1998 "Test Method for Thermal Transition Temperature of Textile Materials - Differential Scanning Calorimetry". The test range is -50°C to 150°C, the heating rate is 20°C / min, and the entire test process is carried out under nitrogen protection.

[0039] The test range of DTA is from room temperature (about 15°C) to 100°C, and the heating rate is 5°C / min.

[0040] In order to prevent the moisture contained in the sample (about 10mg) from affecting the DTA / DSC curve, the sample must be placed in a desiccator to dry for a period of time before testing.

[0041] The...

example 1

[0046] Example 1 Waterproof and moisture-permeable finishing of pure cotton woven fabric by coating method

[0047] (1) Preparation of polyurethane coating finishing agent

[0048] Measure the volume of the whole reactant to be 100 parts (the total volume is 2000ml), add 5 parts of polyethylene oxide triol 3300 (please use the full name in the embodiment, the same below) and 10 parts of polyethylene glycol 2000 into three ports In the flask, vacuumize and heat to 110°C for dehydration for 2.5 hours;

[0049] Cool down to 50°C and blow in nitrogen; dissolve 15 parts of 4,4'-diphenylmethane diisocyanate in 20 parts of N,N-dimethylformamide and add to the reaction system under the protection of nitrogen, and at 75°C React for 2 hours;

[0050] Cool down to 40°C; add N,N-dimethylformamide solution containing 5 parts of dimethylolpropionic acid in four times, and react at 60°C for 1.5 hours (if the viscosity is too high, add some acetone to reduce the viscosity);

[0051] Weigh ...

Embodiment 2

[0060] Embodiment 2 Waterproof and moisture-permeable finishing of nylon-cotton blended fabric

[0061] (1) Preparation of temperature-sensitive waterproof and moisture-permeable finishing agent

[0062] The volume of the entire reactant is measured to be 100 parts (total volume is 3000ml), and 10 parts of polyethylene oxide triol 3300 is mixed with 2 parts of 1,4-butylene adipate diol 1000 and 6 parts of Add polytetrahydrofuran diol 2000 into a three-necked flask, vacuumize and heat to 120°C for dehydration for 2 hours;

[0063] Cool down to 65°C and blow nitrogen; dissolve 10 parts of 4,4'-diphenylmethane diisocyanate and 12 parts of dimethylolpropionic acid in 25 parts of N,N-dimethylformamide under the protection of nitrogen Add the reaction system and react at 80°C for 1.5 hours;

[0064] Cool down to 50°C; add N,N-dimethylformamide solution containing 3 parts of dimethylolpropionic acid four times, and react at 65°C for 2 hours (if the viscosity is too high, add some a...

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Abstract

The invention discloses a temperature-sensitive hydrophilic cross-linking crystal type polyurethane coating agent, a preparation method thereof and application thereof, and belongs to the technical field of textile chemical engineering. The preparation thereof comprises the following steps of: using a prepolymer method, taking 4,4'-diphenylmethane diisocyanate (pure MDI) as a hard segment, taking polyester polyol or polyether polyol as a soft segment, adding micromolecular diol chain-extension into the segments, and performing self-emulsification to obtain the polyurethane coating agent. After textile is coated by adopting a proper process, the capability of hydrostatic pressure and moisture permeability of the textile is greatly improved, and the moisture permeability of the textile represents higher response accuracy and sensitivity to environmental temperature changes. The response range of the moisture permeability of the finished coated textile to the environmental temperature changes is between about 17.0 and 28.0 DEG C so as to furthest meet the requirement of a human body on comfort.

Description

technical field [0001] The invention belongs to the technical field of textile chemicals, and in particular relates to the preparation of a temperature-sensitive polyurethane finishing agent and its application in waterproof and moisture-permeable finishing of textiles. Background technique [0002] With the further enhancement of human's ability to understand and conquer nature, people's operations in special environments have also been greatly expanded. Therefore, the research and development of protective clothing for work in extreme environments will be a very meaningful work. Among the many protective clothing, waterproof and moisture-permeable (vapor) clothing is one of the high value-added products that have been developed in the past two or three decades, and it is also a hot spot in current research. It is a unique functional textile integrating waterproof, moisture-permeable, windproof and warm-keeping properties, which is constantly developing to high-grade in th...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D175/06C08G18/66C08G18/48D06M15/568D06M15/572D06M101/02D06M101/16
Inventor 权衡陈晓光杨梅
Owner 广东广纺检测技术股份有限公司
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