Silicone modified acrylic-polyurethane heterocomplexing water dispersion and preparing method thereof

A technology of acrylic polyurethane and acrylate, which is applied in the field of organosilicon-modified acrylic polyurethane hybrid aqueous dispersion and its preparation, can solve the problems of poor heat resistance and solvent resistance, poor stability, and unstable products, and achieve good durability Effect of thermal performance and chemical resistance, good heat resistance and solvent resistance, good dispersion stability

Inactive Publication Date: 2004-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current coating technology, due to environmental reasons, it is necessary to reduce the discharge of organic solvents. The effective measure is to use water-based systems to replace traditional solvent-based systems. Water-based polyurethane dispersions are the most important category. About water-based polyurethane dispersions There are many research reports on the body and its preparation method. The earliest method of preparing water-based polyurethane dispersion is to add an external emulsifier, but the obtained product is unstable and sensitive to water after film formation; later, in order to improve the stability of the product, the United States In patent US4147679 and patent US4203883, hydrophilic groups are introduced into polymer chain segments for internal emulsification. The hydrophilicity of the polyurethane prepolymer comes from the carboxylate groups of the chain side groups, but the resulting polyurethane has poor water resistance; In addition, D.Dieterich described in a review article (D.Dieterich, Prog.Org.Coatings, 9, 281 (1981)) the use of polyacrylate dispersions and polyurethane dispersions for physical blending, but the prepared dispersions There are distinct phase regions of acrylic and polyurethane, and the stability is poor
Patents DE-A-1953348, EP-A167188, EP-A189945 and EP-A308115 propose that in the presence of aqueous polyurethane dispersions, suitable acrylate monomers can undergo free radical polymerization, and the obtained products are polyurethane and polyacrylic acid The two types of polymer chains of esters are closely miscible at the molecular level to produce a hybrid dispersion formed by many interchain entanglements and secondary intermolecular forces. Its physical and mechanical properties and stability are higher than those of physical blends. However, the heat resistance and solvent resistance of the acrylic polyurethane dispersion obtained above are relatively poor, and it is difficult to industrialized application

Method used

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  • Silicone modified acrylic-polyurethane heterocomplexing water dispersion and preparing method thereof
  • Silicone modified acrylic-polyurethane heterocomplexing water dispersion and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The weight of each reaction raw material is as follows:

[0039] quality

[0040] No. Raw material name

[0041] (g)

[0042] 1 Isophorone diisocyanate 100.7

[0043] 2 polycaprolactone diol (Mn=1000) 26.3

[0044] 3 polyoxypropylene ether glycol (Mn=1000) 26.3

[0045] 4 Dibutyltin dilaurate 0.05

[0046] 5 1,4-butanediol 21.1

[0047] 6 2,2-di(hydroxymethyl)propionic acid 11.9

[0048] 7 N-methyl-2-pyrrolidinedione 14.6

[0049] 8 1,4-cyclohexyl dimethanol vinyl ether 8.2

[0050] 9 Triethylamine 8.4

[0051] 10 Methyl methacrylate 148.1

[0052] 11 Hexamethylenediamine 8.8

[0053] 12 Isopropanol 0.05

[0054] 13 Deionized water 766.6

[0055] 14 Initiator solution 21.5

[0056] 15 Butyl Acrylate 16.8

[0057] 16 γ-methacryloxypropyltriisopropoxysilane 3.8

[0058] 17 Sodium chloride 1.0

[0059] Note: The initiator solution is prepared by dissolving 1.5g of azobisisobutyro...

Embodiment 2

[0079] Each reaction raw material and its weight composition are basically the same as Example 1, only the weight of 1,4-cyclohexyl dimethanol vinyl ether is increased, from 8.4g to 10.6g, 12.9g, 16.7g respectively, in order to maintain the overall The ratio of the amount of isocyanate group to hydroxyl group substance remains unchanged, and the mass parts of 1,4-butanediol are correspondingly reduced, and the reaction steps of Example 1 are used to prepare three organosilicon modifications with numbers A, B, and C respectively. Aqueous dispersion samples of acrylic polyurethane hybrids. The specific performance comparison of the three samples is as follows:

[0080] project result

[0081] A B C

[0082] Translucent None Translucent None Translucent None

[0083] Appearance of emulsion Mechanical impurities, no coagulation Mechanical impurities, no coagulation Mechanical impurities, no coagulation

[0084] ...

Embodiment 3

[0102] Each reaction raw material and its weight composition are basically the same as in Example 1, only the mass parts of functional organosiloxane γ-methacryloxypropyltriisopropoxysilane are increased from 3.8g to 4.3g, 6.1g, 10.2g, in order to keep the total amount of monomers unchanged, reduce the mass parts of methyl methacrylate correspondingly, and prepare three organic compounds with numbers D, E, and F respectively with the reaction steps of Example 1. Aqueous dispersion sample of silicon-modified acrylic polyurethane hybrid. The specific performance comparison of the three samples is as follows:

[0103] result

[0104] project

[0105] D E F

[0106] Translucent None Translucent None Translucent None

[0107] Appearance of emulsion Mechanical impurities, no coagulation Mechanical impurities, no coagulation Mechanical impurities, no coagulation

[0108] Polymer emulsion...

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Abstract

The invention provides an organosilicon modified acrylic polyurethane heterozygous aqueous dispersion as well as its preparing method, including the steps: make polyurethane prepolymer with hydrophilic group, make polyurethane prepolymer with side-chain activity double bonds, make propenoate monomer and anion polyurethane dispersion, and finally obtain it, which has interpenetrating network structure and nuclear shell structure. It has good heat resistance and solvent resistance, the performance advantages of polyurethane, crylic acid and organosilicon, and good dispersion stability; it has wide applications to monocomponent water carpentry paint and basal material in building paint, and its storage is stable.

Description

technical field [0001] The invention relates to water-based polyurethane dispersion technology, in particular to a silicone-modified acrylic polyurethane hybrid aqueous dispersion and a preparation method thereof. Background technique [0002] In the current coating technology, due to environmental reasons, it is necessary to reduce the discharge of organic solvents. The effective measure is to use water-based systems to replace traditional solvent-based systems. Water-based polyurethane dispersions are the most important category. About water-based polyurethane dispersions There are many research reports on the body and its preparation method. The earliest method of preparing water-based polyurethane dispersion is to add an external emulsifier, but the obtained product is unstable and sensitive to water after film formation; later, in order to improve the stability of the product, the United States In patent US4147679 and patent US4203883, hydrophi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/14C08G18/10C08G18/83C08K5/5415
Inventor 涂伟萍胡剑青夏正斌
Owner SOUTH CHINA UNIV OF TECH
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