阅读说明：本技术 无溶剂聚酯硅氧烷树脂及其制备方法和用途 (Solvent-free polyester siloxane resin and preparation method and application thereof ) 是由 邓贤均 于 2020-07-14 设计创作，主要内容包括：本发明提供一种无溶剂聚酯硅氧烷树脂,由有机硅单体、六氢苯酐、甲基丙二醇和二元聚醚制得,树脂固体份高。本发明制备方法简单,工艺稳定,适合工业化生产。本发明无溶剂聚酯硅氧烷树脂用于调配的聚酯硅氧烷清漆及白聚硅氧烷面漆重涂性好,相关涂料产品满足JT/T722-2008公路桥梁钢结构防腐涂装技术条件相关产品标准要求,同时无溶剂生产,符合环保要求。(The invention provides a solvent-free polyester siloxane resin which is prepared from an organic silicon monomer, hexahydrophthalic anhydride, methyl propylene glycol and binary polyether, and has high solid content. The preparation method is simple, stable in process and suitable for industrial production. The solvent-free polyester siloxane resin is used for preparing polyester siloxane varnish and white polysiloxane finish paint, has good recoatability, related paint products meet the product standard requirements related to the technical conditions of anticorrosive coating of steel structures of JT/T722-2008 highway bridges, and simultaneously, the solvent-free polyester siloxane resin is produced without solvent and meets the requirement of environmental protection.)

1. The solvent-free polyester siloxane resin is characterized by being prepared from the following raw materials in parts by weight: 35-41% of organosilicon monomer, 24-28% of hexahydrophthalic anhydride, 20-24% of methyl propylene glycol and 8-10% of binary polyether by mass percentage.

2. The solventless polyester silicone resin of claim 1 wherein: the organic silicon monomer is Z-6018 organic silicon monomer; the binary polyether is binary polyether A21.

3. A process for preparing a solventless polyester silicone resin as claimed in claim 1 or 2 wherein: putting an organic silicon monomer, hexahydrophthalic anhydride and methyl propylene glycol into a reaction kettle, heating to 150 +/-2 ℃ at the speed of 10 ℃/h, and preserving heat for 2 hours; then raising the temperature to 180 +/-2 ℃ at the speed of 5 ℃/hour, and preserving the temperature for 2 hours; heating to 200 + -2 deg.C at a rate of 5 deg.C/hr, and maintaining the temperature until the acid value is less than or equal to 8 and the viscosity (coating-4) is 60-90 s; and finally, cooling to below 120 ℃, adding the binary polyether, uniformly stirring, and taking out of the pot to obtain the product.

4. Use of the solventless polyester silicone resin according to claim 1 or 2 for formulating a polyester silicone varnish.

5. Use of the solventless polyestersiloxane resin of claim 1 or 2 for formulating a white silicone topcoat.

6. A solventless polyester silicone varnish formulated using the solventless polyester silicone resin of claim 1 or 2.

7. The solventless polyester silicone varnish according to claim 6, wherein: is prepared from a component A and a component B, wherein the component A comprises the following components: 98 parts of the solvent-free polyester siloxane resin of claim 1 or 2, 2 parts of binary polyether, and 0.05 part of 2% zinc naphthenate solution; the 2% zinc naphthenate solution is zinc naphthenate diluted by dimethylbenzene serving as a solvent, and is calculated by mass percentage; the component B is a 100% solid part fatty cluster polyurethane curing agent; the weight part ratio of the A to the B is 4: 1.

8. a white polysiloxane topcoat formulated using the solventless polyestersiloxane resin of claim 1 or 2.

9. The white silicone topcoat of claim 8, wherein: is prepared from a component A and a component B, wherein the component A comprises the following components: 78 parts of the solvent-free polyester siloxane resin as described in claim 1 or 2, 20 parts of titanium dioxide, 2 parts of binary polyether, and 0.05 part of 2% zinc naphthenate solution; the 2% zinc naphthenate solution is zinc naphthenate diluted by dimethylbenzene serving as a solvent, and is calculated by mass percentage; the component B is a fatty cluster polyurethane curing agent; the weight part ratio of the A to the B is 4: 1.

10. the white silicone topcoat of claim 9, wherein: the aliphatic polyurethane curing agent is HDI 100% solid aliphatic polyurethane curing agent.

Technical Field

The invention relates to the field of synthesis and application of high polymer resin, in particular to solvent-free polyester siloxane resin and a preparation method and application thereof.

Background

Polysiloxane resins are coating film formers which have been widely used in recent years for large bridges and municipal works where higher demands are made. The paint is well accepted by the market due to the characteristics of high weather resistance and high chemical medium resistance. The traditional polysiloxane resin has relatively low solid content, so that the non-volatile content of related coating products is low, and the standard requirements of related products of JT/T722-2008 highway bridge steel structure anticorrosive coating technical conditions are difficult to meet; and because of poor recoatability, the appearance of a paint film after recoatability is poor, and the decoration performance of the paint film is affected seriously. With the strong enhancement of the environment protection work of society, the more importance of factories on safe production, the strict regulation of policies related to governments of all levels of each country, and the trend of organic synthetic high-solid and solvent-free polysiloxane resin is generated.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide the solvent-free polyester siloxane resin which has high solid content and good recoatability, the related coating product meets the product standard requirements related to the technical conditions of anticorrosive coating of steel structures of JT/T722-2008 highway bridges, and meanwhile, the solvent-free production meets the environmental protection requirements.

Except for special description, the parts are parts by weight, and the percentages are mass percentages.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the solvent-free polyester siloxane resin is characterized by being prepared from the following raw materials in parts by weight: 35-41% of organosilicon monomer, 24-28% of hexahydrophthalic anhydride, 20-24% of methyl propylene glycol and 8-10% of binary polyether by mass percentage.

Further, in the solvent-free polyester siloxane resin, the organic silicon monomer is Z-6018 organic silicon monomer; the binary polyether is binary polyether A21.

The invention also aims to provide the preparation method of the solvent-free polyester siloxane resin, which is simple to operate, stable in process and suitable for industrial production.

The preparation method of the solvent-free polyester siloxane resin is characterized by comprising the following steps: putting an organic silicon monomer, hexahydrophthalic anhydride and methyl propylene glycol into a reaction kettle, heating to 150 +/-2 ℃ at the speed of 10 ℃/h, and preserving heat for 2 hours; then raising the temperature to 180 +/-2 ℃ at the speed of 5 ℃/hour, and preserving the temperature for 2 hours; heating to 200 + -2 deg.C at a rate of 5 deg.C/hr, and maintaining the temperature until the acid value is less than or equal to 8 and the viscosity (coating-4) is 60-90 s; and finally, cooling to below 120 ℃, adding the binary polyether, uniformly stirring, and taking out of the pot to obtain the product.

It is a further object of the present invention to provide the use of the above solvent-free polyester silicone resin in the formulation of a polyester silicone varnish.

It is a further object of the present invention to provide the use of the above solventless polyestersiloxane resin for the formulation of white silicone topcoats.

It is a further object of the present invention to provide a solventless polyester silicone varnish formulated using the above solventless polyester silicone resin. Further, the solvent-free polyester siloxane varnish is prepared from a component A and a component B, wherein the component A comprises the following components: 98 parts of the solvent-free polyester siloxane resin, 2 parts of binary polyether and 0.05 part of 2% zinc naphthenate solution, wherein the 2% zinc naphthenate solution is zinc naphthenate diluted by dimethylbenzene serving as a solvent in percentage by mass; the component B is a fatty cluster polyurethane curing agent; a: b is 4: 1 (parts by weight).

It is a further object of the present invention to provide a white polysiloxane topcoat formulated using the solventless polyestersiloxane resin described above. Further, the white polysiloxane finish paint is prepared from a component A and a component B, wherein the component A comprises the following components: 78 parts of the solvent-free polyester siloxane resin, 20 parts of titanium dioxide, 2 parts of binary polyether and 0.05 part of 2% zinc naphthenate solution, wherein the 2% zinc naphthenate solution is zinc naphthenate diluted by dimethylbenzene serving as a solvent in percentage by mass; the component B is a fatty cluster polyurethane curing agent; a: b is 4: 1 (parts by weight).

The aliphatic polyurethane curing agent is an HDI 100% solid polyurethane curing agent, such as N3600 and N3900.

Has the advantages that:

the synthesis of silicone resins goes through two stages, epoxy resin modified silicone resins of the first generation and current acrylic silicone resins of the second generation. The epoxy polysiloxane resin has poor light and color retention, and is gradually forgotten in the market. However, acrylic silicone resins which are excellent in gloss retention and color retention are currently sought after. The invention further improves the solid by nearly 100 percent on the basis of the acrylic polysiloxane resin, and realizes the solvent-free and low viscosity of the polyester siloxane resin by a brand new scheme of a synthetic route of the acrylic polysiloxane resin and the selection and the proportion of raw materials; and the better oil solubility of the polyester chain segment effectively changes the interface interpenetration and interpenetration during the recoating of related coating products, thereby realizing the good construction recoatability. The preparation method is simple, stable in process and suitable for industrial production.

Detailed Description

The present invention is described in detail below with reference to specific examples, which are given for the purpose of further illustrating the invention and are not to be construed as limiting the scope of the invention, and the invention may be modified and adapted by those skilled in the art in light of the above disclosure. The corresponding performances of the varnish and the finish paint prepared by the invention are tested by adopting the existing corresponding national standard detection method. The raw materials and the reagents are all commercial products, wherein HDI 100% solid polyurethane curing agents N3600 and N3900 are provided by Bayer, and Z-6018 organic silicon monomer is provided by Dow Corning, USA; the binary polyether A21 was supplied by Nanjing Willd chemical Co.

Preparation of (I) solvent-free polyester siloxane resin liquid