阅读说明：本技术 一种耐黄变的中密度纤维板低温固化粉末涂料 (Anti-yellowing medium-density fiberboard low-temperature curing powder coating ) 是由 方学平 刘建明 于 2020-07-22 设计创作，主要内容包括：本发明提供了一种耐黄变的中密度纤维板低温固化粉末涂料,由下列重量份的原料组成：含羧基饱和聚酯树脂A 156～210重量份、含羧基饱和聚酯树脂B 250～400重量份、双酚A环氧树脂104～140重量份、异氰尿酸三缩水甘油酯19～30重量份、颜料100～200重量份、填料60～171重量份、助剂10重量份,所述含羧基饱和聚酯树脂A、含羧基饱和聚酯树脂B的酸值差不小于16mgkOH/g。本发明采用酸值不同的含羧基饱和聚酯树脂,提高粉末涂料成品的耐紫外性能,延长涂料的使用寿命。(The invention provides a yellowing-resistant medium-density fiberboard low-temperature curing powder coating which is prepared from the following raw materials in parts by weight: 156-210 parts of carboxyl-containing saturated polyester resin A, 250-400 parts of carboxyl-containing saturated polyester resin B, 104-140 parts of bisphenol A epoxy resin, 19-30 parts of triglycidyl isocyanurate, 100-200 parts of pigment, 60-171 parts of filler and 10 parts of auxiliary agent, wherein the difference between the acid values of the carboxyl-containing saturated polyester resin A and the carboxyl-containing saturated polyester resin B is not less than 16 mgkOH/g. The invention adopts the saturated polyester resin containing carboxyl with different acid values, improves the ultraviolet resistance of the finished powder coating and prolongs the service life of the coating.)

1. The yellowing-resistant medium-density fiberboard low-temperature curing powder coating is characterized by comprising the following raw materials in parts by weight: 156-210 parts of carboxyl-containing saturated polyester resin A, 250-400 parts of carboxyl-containing saturated polyester resin B, 104-140 parts of bisphenol A epoxy resin, 19-30 parts of triglycidyl isocyanurate, 100-200 parts of pigment, 60-171 parts of filler and 10 parts of auxiliary agent, wherein the difference between the acid values of the carboxyl-containing saturated polyester resin A and the carboxyl-containing saturated polyester resin B is not less than 16 mgkOH/g.

2. The powder coating according to claim 1, characterized by consisting of the following raw materials in parts by weight: 156-180 parts of carboxyl-containing saturated polyester resin A, 370-400 parts of carboxyl-containing saturated polyester resin B, 104-120 parts of bisphenol A epoxy resin, 28-30 parts of triglycidyl isocyanurate, 100-200 parts of pigment, 60-132 parts of filler and 10 parts of auxiliary agent.

3. The powder coating according to claim 1, wherein the carboxyl group-containing saturated polyester resin A has an acid value of 50. + -. 5mgkOH/g, a softening point of 110. + -. 10 ℃ and a glass transition temperature of 52 to 60 ℃.

4. The powder coating according to claim 1, wherein the carboxyl group-containing saturated polyester resin B has an acid value of 32. + -. 3mgkOH/g, a softening point of 110. + -. 10 ℃ and a glass transition temperature of 62 to 65 ℃.

5. The powder coating as claimed in claim 1, wherein the bisphenol A epoxy resin has an epoxy equivalent of 500-575g/eq and a softening point of 82-92 ℃.

6. The powder coating according to claim 1, wherein the triglycidyl isocyanurate has an epoxy equivalent weight of 100 to 110g/mol and a melting range of 95 to 125 ℃.

7. The powder coating of claim 1, wherein the pigment is one or more of titanium dioxide, carbon black, iron oxide red, and iron oxide yellow.

8. The powder coating of claim 1, wherein the filler is one or more of precipitated barium sulfate, high-gloss barium, high-gloss calcium, and quartz powder.

9. The powder coating of claim 1, wherein the auxiliary agent is one or more of a brightener, a leveling agent, benzoin, wax powder, and a graining agent.

10. The powder coating according to claim 1, wherein the powder coating is prepared by the following method:

step 1: mixing and fully and uniformly stirring the carboxyl-containing saturated polyester resin, the bisphenol A epoxy resin, the triglycidyl isocyanurate, the pigment, the filler and the auxiliary agent;

step 2: melting and mixing the mixed materials, extruding at 90-110 ℃, and tabletting;

and step 3: and (3) after the sheet material is cooled, grinding the sheet material into powder by an ACM (Acetomine) grinder, and controlling the particle size to be 30-40 microns to finally obtain the yellowing-resistant medium-density fiberboard low-temperature curing powder coating.

Technical Field

The invention relates to a low-temperature curing powder coating, in particular to a yellowing-resistant medium-density fiberboard low-temperature curing powder coating, belonging to the coating manufacturing industry.

Background

The powder coating is a novel 100% solid powder coating without solvent, and has the characteristics of no solvent, no pollution, recoverability, energy and resource saving, high mechanical strength of a coating film and the like. The MDF powder spraying technology is a particularly hot topic in the world recently, and along with the major breakthrough of the MDF technology and the process, the MDF powder spraying technology has the great advantages, so that the MDF powder spraying technology can occupy an important position in the domestic market in the coming years. However, conventional MDF powder is easily yellowed by sunlight irradiation, so that the appearance and physical properties of the product are seriously affected. Therefore, the yellowing of the MDF powder is solved, and the service life of the coating film can be effectively protected.

Disclosure of Invention

The invention provides a yellowing-resistant medium-density fiberboard low-temperature curing powder coating, which aims to prolong the service life of the powder coating.

The invention provides a yellowing-resistant medium-density fiberboard low-temperature curing powder coating which is prepared from the following raw materials in parts by weight: 156-210 parts of carboxyl-containing saturated polyester resin A, 250-400 parts of carboxyl-containing saturated polyester resin B, 104-140 parts of bisphenol A epoxy resin, 19-30 parts of triglycidyl isocyanurate, 100-200 parts of pigment, 60-171 parts of filler and 10 parts of auxiliary agent, wherein the difference between the acid values of the carboxyl-containing saturated polyester resin A and the carboxyl-containing saturated polyester resin B is not less than 16 mgkOH/g.

Further, the feed additive comprises the following raw materials in parts by weight: 156-180 parts of carboxyl-containing saturated polyester resin A, 370-400 parts of carboxyl-containing saturated polyester resin B, 104-120 parts of bisphenol A epoxy resin, 28-30 parts of triglycidyl isocyanurate, 100-200 parts of pigment, 60-132 parts of filler and 10 parts of auxiliary agent.

Further, the acid value of the carboxyl-containing saturated polyester resin A is 50 +/-5 mgkOH/g, the softening point is 110 +/-10 ℃, and the glass transition temperature is 52-60 ℃.

Further, the acid value of the saturated polyester resin B containing carboxyl is 32 +/-3 mgkOH/g, the softening point is 110 +/-10 ℃, and the glass transition temperature is 62-65 ℃.

Furthermore, the epoxy equivalent of the bisphenol A epoxy resin is 500-575g/eq, and the softening point is 82-92 ℃.

Furthermore, the epoxy equivalent of the triglycidyl isocyanurate is 100-110 g/mol, and the melting range is 95-125 ℃.

Further, the pigment is one or more of titanium dioxide, carbon black, iron oxide red and iron oxide yellow.

Further, the filler is one or more of precipitated barium sulfate, high-gloss barium, high-gloss calcium and quartz powder.

Further, the auxiliary agent is one or more of a brightener, a flatting agent, benzoin, wax powder and a graining agent.

Further, the preparation method of the powder coating comprises the following steps:

step 1: mixing and fully and uniformly stirring the carboxyl-containing saturated polyester resin, the bisphenol A epoxy resin, the triglycidyl isocyanurate, the pigment, the filler and the auxiliary agent;

step 2: melting and mixing the mixed materials, extruding at 90-110 ℃, and tabletting;

and step 3: and (3) after the sheet material is cooled, grinding the sheet material into powder by an ACM (Acetomine) grinder, and controlling the particle size to be 30-40 microns to finally obtain the yellowing-resistant medium-density fiberboard low-temperature curing powder coating.

Compared with the prior art, the invention adopts the saturated polyester resin containing carboxyl with different acid values, improves the ultraviolet resistance of the finished product of the powder coating and prolongs the service life of the coating.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The preparation method of the powder coating of the embodiment and the comparative example comprises the following steps:

step 1: mixing the raw material components and fully and uniformly stirring;

step 2: pouring the mixture obtained in the step 1 into an extruder for melting, mixing, extruding (the extrusion temperature is controlled between 90 and 110 ℃), and tabletting;

and step 3: cooling the sheet material, grinding into powder with average particle size controlled within 32-35 microns by ACM pulverizer, and coating with the powder.