CN-122011927-A - Hand brush and spraying dual-purpose odor-removing yellowing-resistant transparent polyurethane primer suitable for various base materials and preparation method thereof

CN122011927ACN 122011927 ACN122011927 ACN 122011927ACN-122011927-A

Abstract

The invention discloses a hand brush and spray coating dual-purpose odor-removing yellowing-resistant transparent polyurethane primer suitable for various base materials and a preparation method thereof, wherein the primer mainly comprises a component A, a component B and a component C, the component A is mainly prepared from odor-removing coconut oil alkyd resin, zinc stearate, a defoaming agent, a leveling agent, an anti-settling agent, functional resin and an organic solvent, the component B is mainly prepared from an HDI trimer, a TDI trimer, a dehydration solvent and a dehydrating agent, the component C is mainly prepared from methyl carbonate, n-butyl acetate and propylene glycol methyl ether acetate, the anti-settling agent is a mixed solution of polyamide wax slurry 6900-20X and n-butyl acetate, the mass concentration of the polyamide wax slurry 6900-20X in the mixed solution is 40%, the functional resin is a mixed solution of cellulose acetate butyrate CAB-381-0.5 and n-butyl acetate, and the mass concentration of the cellulose acetate butyrate CAB-381-0.5 in the mixed solution is 20%. The odor-removing yellowing-resistant transparent polyurethane primer has the advantages of no foaming, no prickly heat, suitability for various base materials, dual purposes of hand brushing and spraying, and the like.

Inventors

Tang Lingbai
YANG ZESHENG
LIN MING
HE MING

Assignees

三棵树涂料股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (4)

1. A hand brush and spraying dual-purpose odor-removing yellowing-resistant transparent polyurethane primer suitable for various base materials is characterized by mainly comprising a component A, a component B and a component C; the component A is mainly prepared from the following raw materials in parts by weight: 60-75 parts of odorless coconut oil alkyd resin, 3-6 Parts of zinc stearate, 0.3-1 Part of defoaming agent, 0.3-1 Part of leveling agent, 2-5 Parts of an anti-settling agent, 3-5 Parts of functional resin, 10-25 Parts of organic solvent; the component B is mainly prepared from the following raw materials in parts by weight: 25-35 parts of HDI trimer, 20-35 Parts of TDI trimer, 30-40 Parts of a dehydration solvent, 0.2-1 Part of dehydrating agent; The component C is mainly prepared from the following raw materials in parts by weight: 20-35 parts of dimethyl carbonate, 35-55 Parts of n-butyl acetate, 15-25 Parts of propylene glycol methyl ether acetate; The anti-settling agent is a mixed solution of polyamide wax slurry 6900-20X and n-butyl acetate, and the mass concentration of the polyamide wax slurry 6900-20X in the mixed solution is 40%; The functional resin is a mixed solution of cellulose acetate butyrate CAB-381-0.5 and n-butyl acetate, and the mass concentration of the cellulose acetate butyrate CAB-381-0.5 in the mixed solution is 20%; The organic solvent is prepared by mixing propylene glycol methyl ether acetate, n-butyl acetate and dimethyl carbonate according to any proportion; The defoaming agent is a modified siloxane type defoaming agent or a non-silicon defoaming agent; When in use, the component A, the component B and the component C are mixed according to the weight ratio of 1:0.5:0.2-0.4.
2. The dual-purpose odor-free yellowing-resistant transparent polyurethane primer for hand brushing and spraying according to claim 1, wherein the primer is characterized by: The modified siloxane type defoamer is Pick BYK066N, and the non-silicon defoamer is Pick BYK052, asahi chemical compound OX880, china HX2300, three AC-300, hamming 3500, gold group 712N or Basoff EFKA2020; The leveling agent is gold mass 1695, china HX3130, pasteur EFKA-3239, chongYao 3369, zhiuhui 3600B, hamming 495, pick BYK358N, pick BYK354 or Pasteur EFKA3777; the odor-free coconut oil alkyd resin is Fang Xin FX-3070, changxing 33012, changxing 33089 or Tuo Pu 3030; The zinc stearate is Hanwei zinc stearate TV-A or Jing zinc stearate H630F; The dehydration solvent is polyurethane-grade n-butyl acetate; The dehydrating agent is FL-180 in the three-star chemical industry; the HDI trimer is Wanhua HI-100, and the TDI trimer is Wanhua TT-350B.
3. The method for preparing the odor-free yellowing-resistant transparent polyurethane primer according to any one of claims 1 to 2, which is characterized by comprising the following steps: (1) Preparing a component A, namely adding the odor-free coconut oil alkyd resin, the defoamer, the flatting agent, the anti-settling agent and 3 parts of organic solvent under the condition of stopping, starting a stirrer, carrying out stirring rotation speed adjustment to 800-1000rpm, dispersing for 10-15min to uniformity, adding zinc stearate, carrying out high-speed dispersion for 15-20min at 1300-1500rpm to uniformity until the fineness is less than or equal to 45 mu m, and adding functional resin and the rest organic solvent to obtain the component A; (2) Preparing a component B, namely putting an HDI trimer, a TDI trimer, a dehydration solvent and a dehydrating agent into a material cylinder, starting a stirrer, and dispersing at a high speed of 1300-1500rpm for 15-20min uniformly to obtain the component B; (3) And (3) preparing the component C, namely adding dimethyl carbonate, n-butyl acetate and propylene glycol methyl ether acetate into a material cylinder, starting a stirrer, and dispersing at a high speed of 800-1000rpm for 10-15min uniformly to obtain the component C.
4. The method for preparing the odor-free yellowing-resistant transparent polyurethane primer according to claim 3, further comprising the step (4) of uniformly mixing the component A, the component B and the component C according to the weight ratio of 1:0.5:0.2-0.4 when in use, thus obtaining the odor-free yellowing-resistant transparent polyurethane primer.

Description

Hand brush and spraying dual-purpose odor-removing yellowing-resistant transparent polyurethane primer suitable for various base materials and preparation method thereof Technical Field The application relates to transparent polyurethane primer, in particular to hand brush and spraying dual-purpose odor-removing yellowing-resistant transparent polyurethane primer which is free of foaming and prickly heat and is applicable to various base materials, and the transparent polyurethane primer is applied to the field of production of furniture and wooden products. Background In the field of high-end wood product coating, polyurethane (PU) clear primer is a key coating for protecting and decorating veneer (e.g., dyed veneer, technical veneer). However, the prior art has the following significant bottlenecks: Firstly, the defects of bubbles and pinholes are prominent, namely, air in wood pores and mechanical bubbles of hand brushing cause bubbles and pinholes (miliaria) in a paint film, and the defects are particularly serious in wet-on-wet process and porous and high-water-content dyeing/technological veneer. The second, construction modes can not be used commonly (1) the hand brushing technology requires the coating to have stronger defoaming performance, but the too strong defoaming performance leads to easy oil running during spraying construction, the spraying technology has moderate defoaming performance, and the spraying is flawless, but the moderate defoaming performance leads to difficult elimination of mechanical bubbles and conduit bubbles during the hand brushing construction, so that the contradiction exists between the two construction modes and the common use can not be realized. (2) Hand brushes require high thixotropic properties for paint to prevent sagging, while spray coating requires low viscosity for atomization, the rheological requirements of the two modes of construction contradict. The problems cause single functions of market products, users need to prepare two kinds of coatings, and cost and complexity are increased. Thirdly, the environment protection, yellowing resistance and performance are difficult to be taken into consideration, the traditional aromatic polyurethane system is easy to be yellowing to influence the appearance of light-colored materials, and meanwhile, some dry films are often accompanied with pungent odor, so that the increasingly strict environment protection and health requirements are difficult to be met. Therefore, the development of the high-performance general odor-free yellowing-resistant transparent polyurethane primer capable of systematically solving the problems has important technical value and market prospect. Disclosure of Invention In view of the above, the application provides a dual-purpose odor-removing yellowing-resistant transparent polyurethane primer which is free from foaming and prickly heat, is suitable for hand brushing and spraying of various base materials and a preparation method thereof. In order to achieve the above purpose, the present application is realized by the following technical scheme: A hand brush and spraying dual-purpose odor-removing yellowing-resistant transparent polyurethane primer mainly comprises a component A, a component B and a component C; the component A is mainly prepared from the following raw materials in parts by weight: 60-75 parts of odorless coconut oil alkyd resin, 3-6 Parts of zinc stearate, 0.3-1 Part of defoaming agent, 0.3-1 Part of leveling agent, 2-5 Parts of an anti-settling agent, 3-5 Parts of functional resin, 10-25 Parts of organic solvent; the component B is mainly prepared from the following raw materials in parts by weight: 25-35 parts of HDI trimer, 20-35 Parts of TDI trimer, 30-40 Parts of a dehydration solvent, 0.2-1 Part of dehydrating agent; The component C is mainly prepared from the following raw materials in parts by weight: 20-35 parts of dimethyl carbonate, 35-55 Parts of n-butyl acetate, 15-25 Parts of propylene glycol methyl ether acetate; The anti-settling agent is a mixed solution of polyamide wax slurry 6900-20X and n-butyl acetate, and the mass concentration of the polyamide wax slurry 6900-20X in the mixed solution is 40%; The functional resin is a mixed solution of cellulose acetate butyrate CAB-381-0.5 and n-butyl acetate, and the mass concentration of the cellulose acetate butyrate CAB-381-0.5 in the mixed solution is 20%; The organic solvent is prepared by mixing propylene glycol methyl ether acetate, n-butyl acetate and dimethyl carbonate according to any proportion; the defoaming agent is a modified siloxane type defoaming agent or a non-silicon defoaming agent, and the defoaming agent is preferably a non-silicon defoaming agent; When in use, the component A, the component B and the component C are mixed according to the weight ratio of 1:0.5:0.2-0.4. The core of the invention is to construct a triple synergistic system, and the specific principle is as follows: 1. The d