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Isocyanate-free primer and preparation method and application thereof

A technology free of isocyanates and isocyanates, applied in polyurea/polyurethane coatings, coatings, primers, etc., can solve the problems of long duration, high inhalation toxicity, and low oral toxicity

Inactive Publication Date: 2017-08-11
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the other hand, isocyanate is one of the main sources of primer toxicity. Inhalation of isocyanate vapor volatilized in the air or direct contact with the skin will cause serious harm to the human body; isocyanate groups can also change proteins and inactivate enzymes. Stimulates receptors and destroys cells
The specificity of isocyanates is that oral toxicity is not high but inhalation toxicity is high and lasts for a long time

Method used

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  • Isocyanate-free primer and preparation method and application thereof

Examples

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preparation example Construction

[0042] The present invention provides a kind of preparation method of the isocyanate-free primer described in the above technical scheme, comprising the following steps:

[0043] Mix polyol polymer with isocyanate and react to obtain isocyanate-terminated polymer;

[0044] The isocyanate-terminated polymer is mixed with a solvent, a color paste, an adhesion promoter, and a catalyst to obtain an isocyanate-free primer.

[0045] The invention mixes the polyol polymer and the isocyanate to react to obtain the isocyanate-terminated polymer. In the present invention, the types and sources of the polyol polymer and isocyanate are the same as those of the polyol polymer and isocyanate described in the above technical solution, and will not be repeated here. In the present invention, the reaction temperature is preferably 60-80° C., more preferably 70° C.; the reaction time is preferably 1-3 hours, more preferably 2 hours.

[0046] After the isocyanate-terminated polymer is obtained...

Embodiment 1

[0055] Add 120g of polyoxypropylene trihydric alcohol (average molecular weight 4800g / mol) into the reactor with mechanical stirring, vacuum, nitrogen protection and heating device, stir at 90°C, and vacuum dry for 3h; then cool down to 70°C, add 18.75 g diphenylmethane diisocyanate, N Under the atmosphere, react for 2h to obtain the isocyanate-terminated polymer, and the R value of the isocyanate-terminated polymer is 2.0;

[0056] Under N2 atmosphere, gradually disperse 10g of the above-mentioned isocyanate-terminated polymer, 65g of ethyl acetate, 15g of color paste, and stir at room temperature for 30min; then add 10g of bis-(γ-trimethoxysilylpropyl)amine, 0.1g of titanic acid n-Butyl ester and 0.1 g of bis(2-dimethylaminoethyl) ether were stirred and dispersed at room temperature for 30 minutes to obtain an isocyanate-free primer.

[0057] The present invention tests the adhesion and stability of the primer prepared in Example 1 according to the bonding effect test method...

Embodiment 2

[0065] Add 120g of polyester polyol (ethylene glycol adipic acid polymerization) (average molecular weight 2000g / mol) into a reactor equipped with mechanical stirring, vacuum, nitrogen protection and heating device, stir at 90°C, and dry in vacuum for 3h; then Cool down to 70°C, add 17.4g of toluene diisocyanate, and react under N2 atmosphere for 2 hours to obtain an isocyanate-terminated polymer, the R value of which is 1.67;

[0066] Under N2 atmosphere, gradually disperse 10g of the above-mentioned isocyanate-terminated polymer, 65g of ethyl acetate, 15g of color paste, stirring and dispersing at room temperature for 30min; then add 8g of bis-(γ-trimethoxysilylpropyl)amine, 4g of N-β -(Aminoethyl)-γ-aminopropyltrimethoxysilane, 0.1g bismuth isooctanoate and 0.1g bis(2-dimethylaminoethyl)ether, continue to stir and disperse at room temperature for 30min, and obtain an isocyanate-free primer agent.

[0067] The present invention tests the adhesion and stability of the primer...

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Abstract

The invention provides isocyanate-free primer and a preparation method and application thereof; the isocyanate-free primer comprises, by weight, 5-10 parts of isocyanate-terminated polymer, 10-30 parts of color paste, 5-15 parts of an adhesion promoter, 50-80 parts of a solvent, and 0.1-0.5 part of a catalyst. The isocyanate-terminated polymer is prepared by reacting an isocyanate with a polyol; the adhesion promoter is selected from one or more of amino silane, epoxy silane and mercapto silane; the solvent is selected from one or more of ethyl acetate, methyl acetate, acetone and butanone; the catalyst is selected from one or more of organic bismuth catalyst, titanate catalyst and amine catalyst. Under the synergy of the components having specific contents, the primer has excellent open stability, the construction time of the primer can be extended, and the impact of the primer upon the safety of construction staff is lowered. The primer can improve adhesion between a glass substrate and polyurethane adhesive.

Description

technical field [0001] The invention relates to the technical field of bonding and sealing, in particular to an isocyanate-free primer, a preparation method and application thereof. Background technique [0002] As automobiles, rail vehicles, passenger cars, ships and other transportation vehicles have higher and higher requirements for comfort and safety, the glass of the driver's cab and compartment is generally connected to the car body by elastic bonding instead of traditional rubber strips. Sealing: the method of bonding not only improves the overall sealing performance, but also connects the glass and the car body together, increasing the rigidity and improving the safety. The original elastic bonding material is polysulfide rubber adhesive, which is inconvenient to use and has a strong smell, so it is no longer used; currently, one-component moisture-curing polyurethane sealant is widely used, which has the advantages of high strength and convenient use. There are al...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D175/06C09D5/00C09D7/12C08G18/76C08G18/48C08G18/42
CPCC08G18/4238C08G18/4825C08G18/4829C08G18/7614C08G18/7671C08K5/5435C08K5/544C08K5/548C08K2201/014C09D5/002C09D175/06C09D175/08C09D7/63
Inventor 何永富李云龙方康俊陶小乐
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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