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Bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for urban rail and bullet train bodies and preparation method thereof

A technology of hyperbranched polyester and high solid content, applied in the field of coatings, can solve the problems of high VOC in construction and difficult to achieve, and achieve the effects of improving various properties, good storage stability and shortening preparation time.

Active Publication Date: 2020-04-07
株洲市九华新材料涂装实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based coatings have become the leader in the new generation of environmentally friendly coatings due to the VOC in the construction process. However, due to the inherent defects in the film-forming mechanism of low-temperature curing water-based coatings used in rail transit, many of their properties such as water resistance, weather resistance, and hardness It is still difficult to meet the standards of traditional solvent-based coatings in terms of indicators; although traditional solvent-based coatings have good water resistance, weather resistance, hardness and other indicators, they have the problem of high VOC in construction

Method used

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  • Bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for urban rail and bullet train bodies and preparation method thereof
  • Bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for urban rail and bullet train bodies and preparation method thereof
  • Bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for urban rail and bullet train bodies and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Weigh each component according to the table

[0049] Table 2: Example 1 component table

[0050]

[0051]

[0052] (2) Dispersion of ingredients: first slowly transfer the high-solid resin into the paint mixing tank, and then turn on the high-speed disperser at a speed of 800 rpm. Slowly pour the weighed hyperbranched polyester resin into the high-solid resin under high-speed stirring. Increase the speed at a constant speed to 1000 rpm. Cover and maintain the above speed for 10 minutes. Add defoamer, mixing aid, leveling agent and catalyst in sequence. Each time a component is added, maintain the rotation speed of 1000 rpm for 2 minutes before adding the next component. After gradually adjusting the rotation speed to 500 rpm, slowly add the mixed solvent, cover, and maintain the rotation speed at 500 rpm for 20 minutes.

[0053] Adjustment: Let the prepared main paint stand for 6 hours to eliminate most of the air bubbles, then pack it into metal barrels ...

Embodiment 2

[0057] (1) Weigh each component according to the table

[0058] Table 3: Example 2 component list

[0059]

[0060]

[0061] (2) with embodiment 1 step (2)

[0062] (3) When in use, the main paint and curing agent are mixed according to the following weight ratio, that is, main paint: curing agent = 100:66; the two components are mixed evenly to obtain the varnish. During construction, add appropriate amount of diluent to adjust to proper viscosity.

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Abstract

The invention relates to a bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for urban rail and bullet train bodies, the bi-component hyperbranched polyester resin high-solid-content high-gloss varnish comprises a main coating and a curing agent, and is characterized in that the main coating consists of the following components in parts by weight: 40-65 parts of high-solid-content resin, 15-35 parts of hyperbranched polyester resin, 0.2-1.0 part of a defoaming agent, 3-6 parts of a mixed auxiliary agent, 0.2-1.0 part of a leveling agent, 0.03-0.08 part of a catalyst and 15-20 parts of a mixed solvent; the curing agent is prepared from 75 to 100 parts of poly-1, 6-hexamethylene diisocyanate and 0 to 25 parts of a mixed solvent; wherein the weight ratio of themain body coating to the curing agent is 100:(50-70). The invention further provides a preparation method of the bi-component hyperbranched polyester resin high-solid-content high-gloss varnish for the urban rail and the bullet train bodies. The varnish has the characteristics of low VOC(volatile organic compound)content and good environmental protection performance, various indexes such as glossiness, weather resistance, corrosion resistance and water resistance of the varnish are obviously superior to those of the same type of water-based paint, and the varnish has excellent protection effect and high decoration on the outer surfaces of urban rails and bullet trains by mixing and crosslinking the main paint and the curing agent to form a film.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a two-component hyperbranched polyester resin high-solid high-gloss varnish for urban rails and bullet train bodies and a preparation method thereof. Background technique [0002] With the increasing national environmental protection requirements, higher requirements are put forward for the environmental protection performance of coating products, and low VOC has become the most important indicator in the development process of coating products. Water-based coatings have become the leader in the new generation of environmentally friendly coatings due to the VOC in the construction process. However, due to the inherent defects in the film-forming mechanism of low-temperature curing water-based coatings used in rail transit, many of their properties such as water resistance, weather resistance, and hardness It is still difficult to meet the standards of traditional solvent-based coatings in...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/08C09D7/48C09D7/47C09D7/65
CPCC09D175/04C09D5/08C09D7/48C09D7/47C09D7/65C08L2201/08C08L83/04
Inventor 龚文晶焦志峰熊武李胜群
Owner 株洲市九华新材料涂装实业有限公司
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