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Aqueous polyurethane dispersing liquid as adhesive and paint and its preparation

A technology of water-based polyurethane and dispersion liquid, which is applied in the field of water-based polyurethane dispersion liquid, and can solve the problems of instantaneous bond strength and final bond strength reduction, energy consumption, and low-strength coatings, etc.

Inactive Publication Date: 2009-06-10
上海倍力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: (1) the method for preparing prepolymer in two steps has increased processing step, makes technology more complicated; (2) used a large amount of solvent (N-methyl-2- pyrrolidone, ie NMP); (3) the prepared aqueous polyurethane dispersion can only be used as a coating and is not suitable for use as an adhesive
The weak point of this patent is: (1) use a kind of special sulfonic acid diamine that does not have commercialization as chain extender and introduce ionic group, so its preparation process must first extend chain to generate high polymer, and then Dispersed into water again, increased the difficulty of dispersing, so used a large amount of acetone to reduce the viscosity of high polymer; and the step of reclaiming acetone; (3) the products Dispercoll U-53 and U-54 produced by this patent have poor film-forming properties and sometimes cracks, which can only be used as adhesives and are not suitable for use as coatings; (4) this patent also discloses A ternary mixed diisocyanate composed of HDI, IPDI and a third diisocyanate can be used to prepare water-based polyurethane adhesives, but diisocyanates with aromatic rings, such as tetramethylxylylene diisocyanate (TMXDI), toluene diisocyanate Isocyanate (TDI) and methylene diphenyl diisocyanate (MDI), etc. are excluded from the third diisocyanate
These patents point out that in HDI / TMXDI, increasing the content of TMXDI will reduce the crystallization rate of the resulting waterborne polyurethane, and when used as an adhesive, the instantaneous bond strength and final bond strength will be reduced
[0008] The above patents and data show that: (1) HDI is a diisocyanate widely used in the preparation of water-based polyurethane dispersions. HDI-based water-based polyurethane dispersions can be used as coatings, and their films are soft and strong. The disadvantages are that Water-based polyurethane dispersions cannot be successfully prepared with HDI alone; (2) prepolymers are prepared in two steps with HDI and IPDI two diisocyanates, and then neutralized, dispersed and diffused to successfully prepare water-based polyurethane coatings, but A large amount of solvent must be used to prepare its prepolymer; (3) TMXDI, as well as its mixture with other diisocyanates, can be used to prepare water-based polyurethane dispersions with less or no solvents, but this type of water-based polyurethane. Film is tacky, or not strong enough for use as a coating

Method used

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  • Aqueous polyurethane dispersing liquid as adhesive and paint and its preparation
  • Aqueous polyurethane dispersing liquid as adhesive and paint and its preparation

Examples

Experimental program
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Effect test

Embodiment 1-2

[0099] Examples 1 and 2 illustrate a mixture of three diisocyanates composed of HDI and two ring-bearing diisocyanates (IPDI and TMXDI), in the presence of a small amount of solvent, a prepolymer synthesized by reacting with DMPA and polyester diol in one step , can successfully prepare a stable aqueous polyurethane dispersion. Compared with U.S. Patent 1. USP6147155, this patent description uses the mixture of HDI and ring-banded diisocyanate (such as IPDI), in the presence of a large amount of solvent (such as NMP of more than 20% of the total amount of prepolymer), and DMPA and polyester diisocyanate Prepolymers synthesized in one step by alcohol reaction cannot be successfully prepared into stable aqueous polyurethane dispersions.

Embodiment 1

[0101] 219.2 g of polyester diol (prepared from 1,6-hexanediol, neopentyl glycol and adipic acid, Molecular weight 2000) and 12.1 grams of DMPA with 9.1 grams of triethylamine, 30.42 grams of HDI, 19.98 grams of IPDI and 21.96 grams of TMXDI, in the presence of 16 grams of acetone, reacted at 70 ° C for 3 hours. The resulting neutralized isocyanate-terminated prepolymer was dispersed in 450 grams of water with rapid stirring, followed by the slow addition of a solution of 12.9 grams of EDA in 22 grams of water. The dispersion was continuously stirred at 60-65°C for 2 hours to obtain a stable translucent aqueous polyurethane dispersion with the following properties:

[0102] Solid content (%): 40.1

[0103] pH: 8.9

[0104] Viscosity (centipoise): 540

[0105] Particle size (nm): 89

Embodiment 2

[0107] In the same glass reactor in Example 1, 210 grams of polyester diol (prepared by 1,4-butanediol and adipic acid, molecular weight 2000), 14.1 grams of DMPA and 2.25 grams of 1,4-butanediol, With 42.34 g of HDI, 23.31 g of IPDI and 5.12 g of TMXDI, in the presence of 17.8 g of acetone, react at 70°C for 3 hours, then add 10.1 g of triethylamine for neutralization for 15 minutes. The neutralized isocyanate-terminated prepolymer was dispersed in 529 grams of water with rapid stirring, followed by the slow addition of a solution of 7.6 grams of EDA in 30 grams of water. The dispersion was continuously stirred at 60-65°C for 2 hours to obtain a stable aqueous polyurethane dispersion with the following properties:

[0108] Solid content (%): 35.1

[0109] pH: 9.1

[0110] Viscosity (centipoise): 350

[0111] Particle size (nm): 180

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Abstract

The water polyurethane dispersion liquor which can be used as adhesive and coating material is a mixture of three kinds of more of isocyanates formed from 1,6-hexyl diisocyanate, tetramethylbenzene dimethylcyanate and other polycyanates, it adopts the preparation process of small quantity of organic solvent of no organic solvent. It is also a nano water polyurethane dispersion liquor which can be used as adhesive, and possesses good film-forming property.

Description

technical field [0001] The present invention relates to a kind of organic macromolecular material, namely can be used as the aqueous polyurethane dispersion liquid of adhesive agent and paint and its preparation method. Background technique [0002] Water-based polyurethane dispersions can be used as adhesives and coatings. Water-based polyurethane dispersions are generally prepared by a four-step process: 1) reacting excess polyisocyanates with polyols and carboxyl-containing diols (or diamines) to form isocyanate-terminated 2) neutralization of the prepolymer; 3) dispersion of the neutralized prepolymer in water; 4) chain extension to generate waterborne polyurethane. Among polyisocyanates, 1,6-hexyl diisocyanate (HDI) is widely used to prepare waterborne polyurethane adhesives and coatings. [0003] U.S. Patent ① USP.6,147,155 (Kenneth P Yonek and Yuliya Berezkill) pointed out that HDI can be used to prepare very soft and very high-strength water-based polyurethane coati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/70C08G18/72
CPCC08G18/721
Inventor 段友芦邹荷仙
Owner 上海倍力新材料有限公司
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