Water-borne polyurethane and preparation method thereof

A water-based polyurethane and hydrophilic technology, used in textiles and papermaking, can solve the problems of low modulus, difficult to adjust viscosity, low mechanical strength, etc., and achieve mild reactivity, easy control of preparation process, and good storage stability. Effect

Inactive Publication Date: 2009-11-25
丽水市优耐克水性树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, the object of the present invention is to prepare a kind of water-based polyurethane dispersion liquid by reacting polyisocyanate and oligomer polyol, add some functional auxiliary agents again, make the product with high mechanical strength, soft and not sticky, to overcome traditional type Waterborne polyurethane has the disadvantages of low modulus, stickiness, low mechanical strength, and difficult adjustment of viscosity. Its physical and chemical properties meet the physical requirements of various industrial fields, especially the synthetic leather industry.

Method used

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  • Water-borne polyurethane and preparation method thereof
  • Water-borne polyurethane and preparation method thereof
  • Water-borne polyurethane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046]Add 60g of isophorone diisocyanate (IPDI) to 150g of butanediol-adipic acid copolymer (PBA) (Mn=2000), and react at 70°C for 120 minutes; add 45g of acetone and control the temperature of the reaction tank At 50°C, 15g of dimethylolpropionic acid (DMPA) was added, and the reaction was continued for 180 minutes at 70°C; the temperature of the reaction tank was controlled at 50°C, and 12g of triethylamine (TEA) was added to neutralize for 30 minutes; 500g of deionized water was added to the neutralized and hydrophilic prepolymer for high-speed emulsification and dispersion, and 5.2g of triethylenetetramine (TETA) was added before the NCO value dropped to 1.5wt%. Continue at room temperature for 5 hours to obtain an aqueous polyurethane dispersion with a solid content of 32wt%; add a thickener and a leveling agent to the aqueous polyurethane dispersion to obtain a finished slurry for synthetic leather, and its viscosity is 3000cps / 20°C, pH 7-9. The tensile strength of the...

Embodiment 2

[0048] Add 55g isophorone diisocyanate (IPDI) to 145g butanediol-adipic acid copolymer (PBA) (Mn=2000), and react at 70°C for 120 minutes; add 40g acetone and control the temperature of the reaction tank At 50 °C, 14 g of dimethylolpropionic acid (DMPA) was added, and the reaction was continued for 180 minutes at 70 °C; the temperature of the reaction tank was controlled at 50 °C, and 11 g of triethylamine (TEA) was added for neutralization reaction for 30 minutes; 450g of deionized water was added to the neutralized and hydrophilic prepolymer for high-speed emulsification and dispersion, and 5.0g of triethylenetetramine (TETA) was added before the NCO value dropped to 1.5wt%. Continue at room temperature for 5 hours to obtain an aqueous polyurethane dispersion with a solid content of 33% by weight; add a thickener and a leveling agent to the aqueous polyurethane dispersion to obtain a finished slurry for synthetic leather, and its viscosity is 2500cps / 20°C, pH 7-9. The tens...

Embodiment 3

[0050] Add 60g isophorone diisocyanate (IPDI) to 150g butanediol-adipic acid copolymer (PBA) (Mn=2000), and react at 65°C for 125 minutes; add 45g of acetone and control the temperature of the reaction tank At 50°C, 15g of dimethylolpropionic acid (DMPA) was added, and the reaction was continued for 170 minutes at 65°C; the temperature of the reaction tank was controlled at 45°C, and 12g of triethylamine (TEA) was added to neutralize for 35 minutes; 500g of deionized water was added to the neutralized and hydrophilic prepolymer for high-speed emulsification and dispersion, and 5.2g of triethylenetetramine (TETA) was added before the NCO value dropped to 1.5wt%. At room temperature for 5.5 hours, a water-based polyurethane dispersion with a solid content of 32 wt% was obtained; adding a thickener and a leveling agent to the water-based polyurethane dispersion, the finished slurry for synthetic leather can be obtained, and its viscosity is 2700cps / 20°C.

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Abstract

The invention provides a water-borne polyurethane resin and preparation method thereof, which is formed by polymerization of aliphatic and / or alicyclic diisocyanate and polyester diol, wherein the polyester diol is polymerized by adipic acid and diol. The invention prepares a water-borne polyurethane dispersion solution through reaction between polyisocyanate and oligo-polyol, and adds some functional auxiliary agents to prepare a product with high mechanical strength, soften property and non-adhesion, thereby overcoming the shortcomings of low modulus, adhesion, low mechanical wetness, difficult adhesion regulation of conventional water-borne polyurethane, and meeting the physicality requirement of various industrial fields, in particular the synthetic leather based on physical and chemical properties thereof. Meanwhile, through the post-thickening combination technology, the water-borne polyurethane dispersion liquid is prepared into slurry to meet the requirements in chemicals, textile and plastics, in particular the synthetic leather and achieve the industrial applicability.

Description

technical field [0001] The invention relates to an aqueous polyurethane and a preparation method thereof, in particular to an aqueous polyurethane used for synthetic leather and a preparation method thereof. Background technique [0002] Polyurethane (PU) refers to the abbreviation of Polyurethane (Polyurethane), a high polymer containing a large number of urethane groups (-NHCOO-, also known as urethane bonds) on the main chain. Its excellent performance has been widely used in various fields of industry, agriculture and daily life. Its products include elastomer materials, coatings, adhesives, elastic fibers, synthetic leather, etc. It is a multifunctional polymer material. With the development of society and economy, it is becoming an indispensable polymer material in social and economic development. However, most of the polyurethane products are solvent-based and contain a large amount of organic solvents such as dimethylamide (DMF) and toluene, which seriously pollutes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/42C08G18/10C08G18/32D06N3/14
Inventor 谢镇铭
Owner 丽水市优耐克水性树脂科技有限公司
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