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Waterborne polyurethane film and preparation technology thereof

A water-based polyurethane and preparation technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of volatile organic compound emission restrictions and achieve the effect of no VOC emissions

Active Publication Date: 2010-12-22
武汉华卫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Organic solvents are often used in the treatment of polyurethane elastomers. With the establishment of environmental protection regulations in various countries and the enhancement of environmental protection awareness, the emission of volatile organic compounds (VOC) in traditional solvent-based coatings is increasingly restricted

Method used

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  • Waterborne polyurethane film and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 100g of water-based polyurethane emulsion JSJ-3090 (Guangzhou Leifu Technology Co., Ltd.), add thickener ASE60 (Rohm Haas company) 1g, disperse at high speed (rotating speed 800 rpm), and then add dropwise ammonia water 0.15g to The viscosity of the waterborne polyurethane coating is 20000mPa.s, and its solid content is 50wt%. Use a glass rod to scrape the water-based polyurethane coating on the release paper of the base material, drag the base material, so that the water-based polyurethane coating passes through a knife-edge gap, apply a thickness of 80 μm, dry at 60°C for 4 minutes, form a film, and wind up.

[0030] After testing, its tensile strength is 18-20Mpa, its elongation at break is 280-300%, and its water vapor transmission rate is 1200g / m 2 .24h.

Embodiment 2

[0032] Take 100 g of water-based polyurethane emulsion JSJ-3096 (Guangzhou Leifu Technology Co., Ltd.), add 2 g of thickener ASE60 (Rohm Haas Company), disperse at high speed (rotating speed 2400 rpm), and then add 0.1 g of ammonia water dropwise under slow stirring to The viscosity of the waterborne polyurethane coating is 50000mPa.s, and its solid content is 40wt%. Use a glass rod to scrape the water-based polyurethane coating on the substrate PET film, drag the substrate, so that the water-based polyurethane coating passes through a knife-edge gap, apply a thickness of 80 μm, dry at 80°C for 3 minutes, form a film, and wind up.

[0033] After testing, its tensile strength is 18-20Mpa, its elongation at break is 280-300%, and its water vapor transmission rate is 900g / m 2 .24h.

Embodiment 3

[0035] Take 100g of water-based polyurethane emulsion BAYDERM bottom 10UD (Lanxess Chemical (Shanghai) Co., Ltd.), add thickener TR-308 (Changzhou Sinoer Chemical Co., Ltd.) 2g, disperse at high speed (2400 rpm), and then stir slowly 0.15 g of triethylamine was added dropwise until the viscosity of the waterborne polyurethane coating was 30000 mPa.s, and its solid content was 28 wt%. Use a glass rod to scrape the water-based polyurethane coating on the substrate PET film, drag the substrate, so that the water-based polyurethane coating passes through a knife-edge gap, apply a thickness of 80 μm, dry at 40°C for 4 minutes, form a film, and wind up.

[0036] After testing, the tensile strength is 12-15Mpa, the elongation at break is 400-600%, and the water vapor transmission rate is 1500g / m2 .24h.

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Abstract

The invention relates to a waterborne polyurethane film and a preparation technology thereof. The preparation technology comprises the following steps: (1) mixing waterborne polyurethane emulsion, a thickener and a pH regulator to prepare a waterborne polyurethane painting, wherein the weight of the thickener accounts for 0.5%-3% of that of the waterborne polyurethane emulsion and the weight of the pH regulator accounts for 0.05%-0.5% of that of the waterborne polyurethane emulsion; (2) placing the waterborne polyurethane painting obtained in step (1) on a base material; (3) dragging the base material to cause the waterborne polyurethane painting to pass through a knife-edge gap, thereby ensuring the film thickness to be 10 mu m-20 mu m; and (4) carrying out drying and rolling on the waterborne polyurethane film obtained in step (3). In the process of the technology of the invention, organic solvent does not volatilize or a little amount of the organic solvent volatilizes and control equipment with complicated fusion, extrusion or calendar is in no need, thereby having the advantages of stability and reliability.

Description

technical field [0001] The invention relates to a water-based polyurethane film and a preparation process thereof. Background technique [0002] Membrane materials play a pivotal role in modern human social activities. In addition to some properties of traditional membrane materials such as lightness, softness, transparency or coloring, barrier, protection and other functions that can meet people's growing needs, some new functional membrane materials are changing people's lives. Membrane materials with breathable function are one of the important growth poles. [0003] At present, there are two types of breathable film materials in the world. One is the microporous breathable film represented by the breathable film for diapers and sanitary napkins that is common in daily life. It is formed by stretching PE and other plastics with calcium carbonate particles added. Its texture and comfort are unsatisfactory; the other is formed by blow molding or extrusion salivation of po...

Claims

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Application Information

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IPC IPC(8): C09D175/04C08J5/18C08L75/04
Inventor 李士修彭连生陈端云
Owner 武汉华卫科技有限公司
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