阅读说明：本技术 耐候型环氧乳液 (Weather-resistant epoxy emulsion ) 是由 郭利 周贤 刘薇薇 赵颖 曹猛 陈维建 王杰 杜怀凯 于 2019-11-13 设计创作，主要内容包括：本发明涉及一种耐候型环氧乳液,其中含有羟基二苯酮结构改性的环氧树脂,其中,所述的羟基二苯酮结构改性的环氧树脂是由：a.环氧树脂,与b.羟基二苯酮类原料,经路易斯酸催化反应制备得到。本发明的耐候型环氧乳液是一种含有羟基二苯甲酮链段改性环氧树脂,对于户外紫外线老化提供遮蔽作用,从而具有良好的耐候性。环氧树脂中接枝羟基二苯酮结构,在双组份体系,酚羟基促进胺与环氧基反应,大大提高了涂料的表干和实干速度,降低能耗达到节能减排。另外耐候型环氧乳液克服了单独加入紫外吸收剂对涂料体系相容差,分散不均,降低涂料的附着力及耐盐雾性能,并开拓底面合一涂料新途径。(The invention relates to a weather-resistant epoxy emulsion, which contains hydroxybenzophenone structure modified epoxy resin, wherein the hydroxybenzophenone structure modified epoxy resin is prepared from the following components in parts by weight: a. epoxy resin and b, hydroxyl benzophenone raw materials are prepared by Lewis acid catalytic reaction. The weather-resistant epoxy emulsion is modified epoxy resin containing a hydroxybenzophenone chain segment, provides a shielding effect on outdoor ultraviolet aging, and has good weather resistance. The structure of the hydroxyl benzophenone grafted in the epoxy resin is that in a two-component system, phenolic hydroxyl promotes the reaction of amine and epoxy, so that the surface drying speed and the actual drying speed of the coating are greatly improved, the energy consumption is reduced, and the purposes of energy conservation and emission reduction are achieved. In addition, the weather-resistant epoxy emulsion overcomes the defect that the ultraviolet absorbent added independently has tolerance and uneven dispersion to a coating system, reduces the adhesive force and the salt spray resistance of the coating, and develops a new way of primer-topcoat integrated coating.)

1. A weather-resistant epoxy emulsion is characterized by containing an epoxy resin modified by a hydroxybenzophenone structure, wherein the epoxy resin modified by the hydroxybenzophenone structure is prepared from: a. epoxy resin and b, hydroxyl benzophenone raw materials are prepared by Lewis acid catalytic reaction.

2. The weatherable epoxy emulsion according to claim 1, wherein the hydroxybenzophenone based material is one or more selected from the group consisting of 2, 4-dihydroxybenzophenone and derivatives and halides thereof.

3. The weatherable epoxy emulsion according to claim 2, wherein the 2, 4-dihydroxybenzophenone derivative comprises one or more of 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-n-ethoxybenzophenone, and 2, 4-dihydroxybenzophenone.

4. The weatherable epoxy emulsion according to claim 2, wherein the halide of 2, 4-dihydroxybenzophenone comprises one or two of 2-hydroxy-4-chloro-benzophenone, 2-hydroxy-4-bromo-benzophenone.

5. The weatherable epoxy emulsion according to claim 1, wherein the hydroxybenzophenone-based starting material is dissolved in acetophenone and then added to the lewis acid-catalyzed reaction.

6. The weatherable epoxy emulsion according to claim 5, wherein said acetophenone is removed under reduced pressure after the Lewis acid catalyzed reaction.

7. The weatherable epoxy emulsion according to claim 1, wherein the Lewis acid catalyst for Lewis acid catalyzed reaction is boron trifluoride, tin tetrachloride, antimony pentafluoride or zinc dichloride, and the Lewis acid catalyst is added to the Lewis acid catalyzed reaction after complexing with diethyl ether.

8. The weather-resistant epoxy emulsion according to claim 1, wherein the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin and novolac epoxy resin.

9. The weather-resistant epoxy emulsion according to claim 1, wherein the hydroxybenzophenone structure is present in an amount of 0.1 to 60% by mass based on the modified epoxy resin containing the hydroxybenzophenone structure.

10. The weather-resistant epoxy emulsion as claimed in claim 1, wherein the amount of the complex of the Lewis acid catalyst and the ether is 0.1-1 ‰ of the total weight of the epoxy resin and the hydroxybenzophenone raw material added in the reaction, and the amount of the hydroxybenzophenone raw material is 1-40% of the total weight of the epoxy resin and the hydroxybenzophenone raw material added in the reaction.

Technical Field

The invention discloses a weather-resistant epoxy emulsion.

Background

Epoxy resin has the advantages of good wear resistance, strong adhesion, good chemical stability and thermal stability, etc., but the application of epoxy resin is limited due to the defects of large internal stress, brittle quality, impact resistance, cracking resistance, etc. The water-based paint is prepared by modifying water-based epoxy resin by adopting a benzophenone monohydroxy chain segment. In a two-component system, the phenolic hydroxyl groups can promote the reactivity of amine and epoxy, thereby improving the surface drying time and the actual drying time of the coating. The baking time is reduced, the energy consumption is reduced, and the positive effect is achieved.

Disclosure of Invention

The invention mainly aims to provide a novel weather-resistant epoxy emulsion, which comprises the following specific components:

the epoxy resin modified by a hydroxybenzophenone structure is prepared from the following components in parts by weight: a. epoxy resin and b, hydroxyl benzophenone raw materials are prepared by Lewis acid catalytic reaction.

Further, the weather-resistant epoxy emulsion has the following optimization scheme:

the hydroxybenzophenone raw material adopts one or more of 2, 4-dihydroxybenzophenone and derivatives and halides thereof. The 2, 4-dihydroxy benzophenone derivative includes one or more of 2-hydroxy-4-n-octoxy benzophenone, 2-hydroxy-4-n-ethoxy benzophenone and 2, 4-dihydroxy benzophenone. The 2, 4-dihydroxy benzophenone halide used comprises one or two of 2-hydroxy-4-chloro-benzophenone, 2-hydroxy-4-bromo-benzophenone.

The hydroxybenzophenone raw material is dissolved in the acetophenone and then added into the Lewis acid catalytic reaction. The acetophenone is decompressed and removed after the Lewis acid catalytic reaction.

The Lewis acid catalyst for the Lewis acid catalytic reaction adopts boron trifluoride, tin tetrachloride, antimony pentafluoride or zinc dichloride, and is added into the Lewis acid catalytic reaction after being complexed with diethyl ether.

The epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin and novolac epoxy resin.

The hydroxybenzophenone structure accounts for 0.1-60% of the mass percent of the modified epoxy resin containing the hydroxybenzophenone structure.

The dosage of the complex of the Lewis acid catalyst and the ether is 0.1-1 per mill of the total weight of the epoxy resin and the hydroxybenzophenone raw material added in the reaction, and the dosage of the hydroxybenzophenone raw material is 1-40 percent of the total weight of the epoxy resin and the hydroxybenzophenone raw material added in the reaction.

The weather-resistant epoxy emulsion is modified epoxy resin containing hydroxybenzophenone chain segment, and hydroxyl benzophenone and epoxy resin BF are used ₃Polycondensed under the catalysis, and then added with a multifunctional emulsifier for emulsification to synthesize the special water-based epoxy resin emulsion. The epoxy emulsion contains benzophenone monohydroxy chain segment, and the ultraviolet absorption function of the chain segment compound is to convert absorbed light energy into heat energy by virtue of conversion of ketone type and enol type in a molecular structure. Provides shielding effect for outdoor ultraviolet aging, thereby having good weather resistance. The structure of the hydroxyl benzophenone grafted in the epoxy resin is that in a two-component system, phenolic hydroxyl promotes the reaction of amine and epoxy, so that the surface drying speed and the actual drying speed of the coating are greatly improved, the energy consumption is reduced, and the purposes of energy conservation and emission reduction are achieved. In addition, the weather-resistant epoxy emulsion overcomes the defect that the ultraviolet absorbent added independently has tolerance and uneven dispersion to a coating system, reduces the adhesive force and the salt spray resistance of the coating, and develops a new way of primer-topcoat integrated coating.

Detailed Description

The present invention is further illustrated by the following examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.