Water-borne polyurethane sponge strip coating and preparation method and application thereof

A technology of water-based polyurethane and sponge strips, which is used in the fields of chemical industry and coatings. It can solve the problems of application limitations, coating film water resistance, solvent resistance, poor physical and mechanical properties, and lack of chemical crosslinking, etc., and achieve excellent adhesion and durability. The effect of excellent pollution performance

Inactive Publication Date: 2012-07-18
上海集宝材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the PUDs prepared by the usual method are linear polymers, which can be physically cross-linked through hydrogen bonds, but lack chemical cross-linking. Therefore, the water resistance, solvent resistance and physical and mechanical properties of the coating film are relatively low. Poor, so its application is limited

Method used

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  • Water-borne polyurethane sponge strip coating and preparation method and application thereof
  • Water-borne polyurethane sponge strip coating and preparation method and application thereof
  • Water-borne polyurethane sponge strip coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Preparation of Waterborne Polyurethane Sponge Coating

[0064] 1) In a sealed reactor equipped with a high-speed disperser, high-purity nitrogen protection, and a thermometer, add 200 g of polyoxypropylene diol and 40 g of water-dispersible polyisocyanate at -5 to 15 ° C, and stir and mix evenly;

[0065] 2) Then add 50g of α, ω-dihydroxypropyl polysiloxane dropwise through the dropping funnel under the condition of high-speed dispersion and stirring. After about 0.5h, add 35g of chain extender 1,4-butyl Glycol, stir evenly;

[0066] 3) Add stoichiometric water-dispersible polyisocyanate to make n(NCO):n(OH)=2.5:1 (molar ratio) in the system;

[0067] 4) Raise the temperature system to about 85-90°C for 3-5 hours and add N-acyl methyl taurine sodium, alcohol ether sodium sulfate and Span-20 at a weight ratio of 1:3:2 as the surface The activating agent is uniformly mixed to obtain the silicone copolymerized modified polyurethane emulsion PU-Si; the total amount of the...

Embodiment 2

[0084] The modified aqueous polyurethane dispersion was prepared by the method of Example 1, the difference being that the type of the surfactant was changed, and the other proportions and process conditions were the same. The coating appearance and film-forming stability were tested by GB9278-1988 and HG / T2458-1993 respectively, and the results are shown in Table 3:

[0085] Table 3 Effect of surfactant addition types on coating film

[0086]

Embodiment 3

[0088] The modified water-based polyurethane dispersion adopts aliphatic polyurethane dispersion or aromatic polyurethane dispersion respectively, and other proportions and process conditions are the same as in Example 1. The coating appearance and film-forming stability were tested by GB9278-1988 and HG / T2458-1993 respectively, and the results are shown in Table 4:

[0089] Table 4 Effect of using aliphatic and aromatic polyurethane dispersions on the coating film

[0090]

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Abstract

The invention provides water-borne polyurethane sponge strip coating and a preparation method and application thereof. The water-borne polyurethane sponge strip coating comprises the following components in parts by weight: 40-50 parts of modified water-borne polyurethane dispersion, 1-8 parts of a slip agent, 10-20 parts of wax powder, 1-3.5 parts of silicon emulsion, 1-6 parts of a brightening agent, 0.2-2.5 parts of a wetting agent, 3-7 parts of curing agent, 0.1-2 parts of dispersant, and 0.5-3 parts of plasticizer. The coating provided by the invention can be used on the surfaces of automobile door window sealing strips with EPDM (ethylene propylene diene monomer) and PVC (polyvinyl chloride) as base materials, achieving the effects of slippage increase, esthetic appearance, wear resistance and staining resistance. The product has excellent adhesiveness to the base materials, and the coating has excellent water resistance, weather resistance, washing resistance, creasing resistance and fouling resistance.

Description

technical field [0001] The invention belongs to the fields of chemical industry and paint, and in particular relates to a water-based polyurethane sponge strip paint and its preparation and application. Background technique [0002] With the enhancement of people's awareness of environmental protection and energy, especially the strict restrictions on the content of volatile organic compounds (VOC) in coating systems in various countries' environmental protection regulations, the development of low-pollution coatings represented by water-based coatings has been promoted. Water-based paint is a kind of paint with water as the dispersion medium, which has the advantages of non-flammable, non-toxic, non-polluting, energy-saving and resource-saving. [0003] Water-based polyurethane coatings combine the advantages of high hardness, strong adhesion, abrasion resistance, and solvent resistance of polyurethane coatings with the low VOC content of water-based coatings, and polyureth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/12C08G18/61
Inventor 华道良孔卫东
Owner 上海集宝材料科技有限公司
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