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Two-component polyurethane coating and preparation method thereof

A two-component polyurethane, two-component polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long drying time, easy rash, long waiting time, etc.

Active Publication Date: 2012-07-04
珠海展辰新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two-component polyurethane coating has the advantages of low film-forming temperature, good mechanical properties, and strong corrosion resistance, its disadvantages are: the coating is slow in drying speed, takes a long time to dry, and needs to wait for a long time before it can be polished; Curing under high temperature conditions can speed up the drying speed, but it is prone to the disadvantages of paint film such as prickly heat, and it is difficult to carry out subsequent polishing

Method used

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  • Two-component polyurethane coating and preparation method thereof
  • Two-component polyurethane coating and preparation method thereof
  • Two-component polyurethane coating and preparation method thereof

Examples

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preparation example Construction

[0060] Correspondingly, the present invention also provides a kind of preparation method of above-mentioned two-component polyurethane coating, comprises the steps:

[0061] Take 50-70 parts by weight of saturated fatty acid alkyd resin and dissolve it in 10-15 parts by weight of solvent to obtain a solution of saturated fatty acid alkyd resin;

[0062] Under medium-speed dispersion conditions, 3 to 8 parts by weight of cellulose, 0.1 to 0.5 parts by weight of an antifoaming agent, 0.2 to 0.5 parts by weight of a leveling agent, 3 ~15 parts by weight of talcum powder, 3~5 parts by weight of zinc stearate and 0.1~0.3 parts by weight of drier until the fineness is less than 55 microns to obtain component A;

[0063] Under medium-speed dispersion conditions, mix 25-35 parts by weight of diphenylmethane diisocyanate trimer and 40-55 parts by weight of toluene diisocyanate adduct evenly, and then add 10-20 parts by weight of solvent to obtain group B point.

[0064] As a preferre...

Embodiment 1

[0081] The formulation of this implementation two-component polyurethane coating is as follows:

[0082] Component A

[0083]

[0084] Component B

[0085] TDI trimer 35 parts

[0086] TDI adduct 47 parts

[0087] Polyurethane grade solvent 18 parts

[0088] The production process of two-component polyurethane coatings is as follows:

[0089] Deploying component A:

[0090] Put the saturated fatty acid type alkyd resin into the disperser, set the dispersion speed to 700-800 rpm, add solvent, disperse evenly, add cellulose until completely dissolved, set the dispersion speed to 1000 rpm, and then add defoaming Add agent and leveling agent to disperse for 10 minutes, then add talcum powder and zinc stearate to disperse for 20 minutes until the fineness is ≤55 microns.

[0091] Configure component B:

[0092] Put the TDI trimer and TDI adduct into the disperser, set the dispersion speed to 700-800 rpm, and add polyurethane grade solvent under stirring to disperse evenly...

Embodiment 2

[0101] The formulation of this implementation two-component polyurethane coating is as follows:

[0102] Component A

[0103]

[0104]

[0105] Component B

[0106] TDI trimer 32 parts

[0107] TDI adduct 49 parts

[0108] Polyurethane grade solvent 19 parts

[0109] The making process of two-component polyurethane coating is identical with embodiment.

[0110] During construction, just mix component A: component B uniformly at a ratio of 2:1, and the properties of the obtained quick-drying modified polyurethane primer are as follows (test room temperature: 25°C):

[0111] Surface dry time: ≤15 minutes;

[0112] Drying time: ≤1h;

[0113] Grinding time: ≤1.5h;

[0114] Hardness: ≥H;

[0115] Adhesion: Grade 1.

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Abstract

The invention provides a two-component polyurethane coating, comprising an A component and a B component, wherein the A component comprises fatty acid-type alkyd resin, cellulose, zinc stearate, talcum powder, anti-settling agent, anti-foaming agent, flatting agent, drier and solvent; the B component comprises toluene diisocyanate (TDI) trimer, toluene diisocynate additive product and solvent. The invention also provides a preparation method of the two-component polyurethane coating. The two-component polyurethane coating takes saturated fatty acid-type alkyd resin as main film-forming substance, adds the cellulose and mixes with TDI trimer and TDI additive product as curing agent, so as to be helpful for accelerating the drying of the coating and ensure the mechanical properties of the film. The two-component polyurethane coating provided by the invention has short polishing time which is not more than 1.5 h, excellent film mechanical property, and achieves H-level hardness and 1-level adhesive force.

Description

technical field [0001] The invention relates to the field of polyurethane coatings, in particular to a two-component polyurethane coating and a preparation method thereof. Background technique [0002] Paint is a chemical product made of resin and oil, with or without pigment. Applying the paint on the surface of the object can dry and form a film, which isolates the surface of the coated object from the environmental medium, thus playing a role of protection and decoration for the coated object. [0003] Polyurethane coatings are a class of commonly used coatings that are widely used as wood coatings, automotive refinish coatings, floor coatings, and electronic coatings. Polyurethane coatings are divided into two-component and one-component types. The two-component polyurethane coating is composed of a resin component and a curing agent component, wherein the resin component is mainly a hydroxyl-containing resin, and the curing agent component is mainly an isocyanate prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/12
Inventor 陈寿生
Owner 珠海展辰新材料股份有限公司
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