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Bicomponent polyurethane coating and preparation thereof

A two-component polyurethane and polyurethane coating technology, which is applied in the field of intermediate coatings for automotive surface coating, can solve the problems of inability to form hydrogen bonds, high cost, low acid value, etc., and achieve enhanced interlayer adhesion and enhanced resistance The effect of rocking properties

Active Publication Date: 2012-01-25
ANHUI SANCAI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this coating is owing to adding the nano slurry that handles through nano refinement, and cost is higher, and selects hydroxyl acrylic resin / hydroxy polyester resin hydroxyl content (2.9%) lower in addition, and acid value (5 ± 2mgKOH / g) is lower, only Suitable for topcoats, cannot form hydrogen bonds with most systems of topcoats, but provides good intercoat adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prepare A component according to following formula, the hydroxyl acrylic resin of 30 weight parts, the linear saturated polyester of the 20-30mgKOH / g of the hydroxyl value of 5 weight parts of 30mgKOH / g, acid value (degussa produces, the model is the linear shape of LTW saturated polyester). The toner pigments include: 10 parts by weight of titanium dioxide, 0.02 parts by weight of carbon black, 0.2 parts by weight of toner, and 11 parts by weight of antirust pigments. The antirust pigment is 8 parts by weight of phosphor zinc white, 3 parts by weight of aluminum tripolyphosphate, and 3 parts by weight of flaky zinc powder. The filler is 10 parts by weight of barium sulfate, 7 parts by weight of talcum powder, and 2.4 parts by weight of calcium carbonate. The auxiliary agent includes 1 part by weight of dispersant and 1 part by weight of thixotropic agent, wherein the thixotropic agent is 0.6 part by weight of fumed silicon dioxide and 0.4 part by weight of organic ben...

Embodiment 2

[0052] Component A mixture A1 was prepared according to the recipe described in Example 1.

[0053] The mixture of component B was prepared according to the formula described in Example 1, except that component B did not contain water-absorbing agent and drier, and B2 was obtained.

[0054] The diluent is butyl ester / xylene / tetramethylbenzene weight ratio=1 / 2 / 4.

[0055] According to the weight ratio A1 / B2 / thinner==5 / 1 / 1, make paint, spray it on the iron plate through the electrophoretic antirust primer (DuPont's antirust primer), after the surface is dry for 3 minutes, put it in 60- Bake at 80°C for 30 minutes to obtain a medium-coated iron plate F1 with a dry film of 30-40 microns. The silver powder paint produced by DuPont was sprayed on the iron plate F1 coated with the intermediate paint as the top coat to obtain the test iron plate F2 with the top coat.

Embodiment 3

[0057] Prepare A component mixture according to the formula described in embodiment 1, difference is that linear saturated polyester is the linear saturated polyester (produced by degussa of 12-20mgKOH / g of hydroxyl value about 25mgKOH / g, acid value, model is LTH linear saturated polyester).

[0058] The dry film obtained is 30-40 micron coated iron plate G1 with intermediate paint. The silver powder paint produced by DuPont was sprayed on the iron plate G1 coated with the intermediate paint as the top coat to obtain the test iron plate G2 with the top coat.

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PUM

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Abstract

The invention discloses a bicomponent polyurethane coating, which comprises a component A and a component B. The component A comprises a hydroxy acrylic acid resin, a filler, an auxiliary agent, a solvent, and linear saturated polyester, and the component B comprises an isocyanate curing agent, a solvent, a water absorber (containing or not containing) and a drier (containing or not containing), wherein a hydroxyl value of the linear saturated polyester is between 20 and 36mgKOH / g, and an acid value is between 10 and 30mgKOH / g. The bicomponent polyurethane coating is particularly applicable to a middle coating for the coating of the surfaces of automobiles, further solves the problem of inter-layer adhesion of the middle coating and an anti-corrosive primer and a finishing coat, and strengthens the stone chip resistance and the shock resistance of coatings at the same time.

Description

technical field [0001] The invention relates to a two-component polyurethane coating and a preparation method thereof, which is especially suitable for intermediate coatings for automobile surface coating. Background technique [0002] At present, the market puts forward higher and higher requirements for the decoration, corrosion resistance, stone chip resistance and weather resistance of the automobile surface coating layer, and the importance of the intermediate coating between the antirust primer and the top coat It is also getting more and more attention. The surface of the anti-rust primer is directly sprayed with a topcoat that mainly plays a decorative role. The adhesion between the anti-rust primer and the topcoat is poor, resulting in the anti-stone impact performance of the automobile surface coating layer, that is, the resistance to roadside sand and stones on the car. The impact performance of the surface is poor. Generally speaking, the medium paint can give t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/14
Inventor 蒙飞金挺顺
Owner ANHUI SANCAI IND & TRADE
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