阅读说明：本技术 一种防腐底漆用阳离子型水性丙烯酸乳液及其制备方法 (Cationic water-based acrylic emulsion for anticorrosive primer and preparation method thereof ) 是由 王兆华 张颖君 崔磊 范雨 李明桧 于 2019-10-18 设计创作，主要内容包括：本发明涉及一种防腐底漆用阳离子型水性丙烯酸乳液及其制备方法,属于防腐涂料技术领域,该方法主要为先取部分单体混合物加入反应容器中,同时加入非离子型乳化剂水溶液,在搅拌下加热至65～80℃,然后在搅拌下通过1～2h将剩余混合物滴入反应容器中,接着在搅拌下通过2～3h将阴离子型乳化剂水溶液和部分引发剂水溶液滴入反应容器中,待滴入完成后在60～80℃下保温0.5～2h,最后将剩余引发剂水溶液一次性加入反应容器中,通过0.5～1h升温至80～95℃后保温0.5～2h,冷却即可。制备的乳液具有较好的成膜性能,且漆膜有较好的耐蚀性及附着力,可以和磷酸等酸性溶液或盐溶液任意配合而不破乳。该方法简单易操作,成本低,适合工业化生产。(The invention relates to a cationic water-based acrylic emulsion for an anticorrosive primer and a preparation method thereof, belonging to the technical field of anticorrosive coatings, the method mainly comprises the steps of adding part of a monomer mixture into a reaction container, simultaneously adding a nonionic emulsifier aqueous solution, heating to 65-80 ℃ under stirring, then dripping the rest mixture into the reaction container for 1-2 h under stirring, then dripping the anionic emulsifier aqueous solution and part of an initiator aqueous solution into the reaction container for 2-3 h under stirring, preserving heat for 0.5-2 h at 60-80 ℃ after finishing dripping, finally adding the rest initiator aqueous solution into the reaction container at one time, heating to 80-95 ℃ through 0.5-1 h, preserving heat for 0.5-2 h, and cooling. The prepared emulsion has good film-forming property, and the paint film has good corrosion resistance and adhesive force, and can be randomly matched with acid solutions or salt solutions such as phosphoric acid and the like without emulsion breaking. The method is simple and easy to operate, has low cost and is suitable for industrial production.)

1. A preparation method of a cationic water-based acrylic emulsion for an anticorrosion primer is characterized by comprising the following steps:

(1) weighing 47-175 parts of monomer, 2-6 parts of non-ionic emulsifier, 0.05-0.5 part of anionic emulsifier, 0.2-1 part of initiator and 150-400 parts of water according to parts by mass; the monomers comprise acrylamide, methyl acrylate, ethyl acrylate and butyl acrylate;

(2) uniformly mixing acrylamide, methyl acrylate, ethyl acrylate and butyl acrylate to obtain a mixture, and respectively dissolving a nonionic emulsifier, an anionic emulsifier and an initiator in water to obtain a nonionic emulsifier aqueous solution, an anionic emulsifier aqueous solution and an initiator aqueous solution;

(3) adding 20-50 wt% of the mixture into a reaction container, adding the nonionic emulsifier aqueous solution at the same time, heating to 65-80 ℃ at a stirring speed of 100-300 r/min, then dropping the remaining 50-80 wt% of the mixture into the reaction container through 1-2 h under stirring, dropping 40-60% of the anionic emulsifier aqueous solution and 40-60% of the initiator aqueous solution into the reaction container through 2-3 h under stirring, preserving heat for 0.5-2 h at 60-80 ℃ after the dropping is completed, finally adding the remaining 40-60% of the initiator aqueous solution into the reaction container at one time, heating to 80-95 ℃ through 0.5-1 h, preserving heat for 0.5-2 h, and cooling.

2. The method according to claim 1, wherein the monomer comprises 2 to 10 parts by mass of acrylamide, 15 to 50 parts by mass of methyl acrylate, 20 to 70 parts by mass of ethyl acrylate, and 10 to 45 parts by mass of butyl acrylate.

3. The method of claim 1, wherein the non-ionic emulsifier is nonylphenol polyoxyethylene ether.

4. The method of claim 1, wherein the anionic emulsifier is sodium dodecylbenzene sulfonate.

5. The method of claim 1, wherein the initiator is potassium persulfate.

6. A cationic aqueous acrylic emulsion for an anticorrosive primer prepared by the method according to any one of claims 1 to 5.

Technical Field

The invention belongs to the technical field of anticorrosive coatings, and particularly relates to a cationic water-based acrylic emulsion for an anticorrosive primer and a preparation method thereof.

Background

With the increasing awareness of environmental protection and the increasing perfection of environmental protection laws, the water-based coating is an irresistible development trend. In the field of anticorrosive coatings, the water-based acrylic acid has excellent performances of weather resistance, color retention, pollution resistance, corrosion resistance and the like, so that the water-based acrylic acid is one of representative products which are fastest in development speed and mature in application. However, the synthesis of the existing aqueous acrylic emulsion mainly takes anions as main components, and cationic polymerization has the problems of high cost, poor stability, unsatisfactory acid and alkali resistance and the like.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a method for preparing a cationic aqueous acrylic emulsion for an anticorrosive primer; the second purpose is to provide a cationic water-based acrylic emulsion for the anti-corrosion primer.

In order to achieve the purpose, the invention provides the following technical scheme:

1. a preparation method of a cationic water-based acrylic emulsion for an anticorrosion primer comprises the following steps:

(1) weighing 47-175 parts of monomer, 2-6 parts of non-ionic emulsifier, 0.05-0.5 part of anionic emulsifier, 0.2-1 part of initiator and 150-400 parts of water according to parts by mass; the monomers comprise acrylamide, methyl acrylate, ethyl acrylate and butyl acrylate;

(2) uniformly mixing acrylamide, methyl acrylate, ethyl acrylate and butyl acrylate to obtain a mixture, and respectively dissolving a nonionic emulsifier, an anionic emulsifier and an initiator in water to obtain a nonionic emulsifier aqueous solution, an anionic emulsifier aqueous solution and an initiator aqueous solution;

(3) adding 20-50 wt% of the mixture into a reaction container, adding the nonionic emulsifier aqueous solution at the same time, heating to 65-80 ℃ at a stirring speed of 100-300 r/min, then dropping the remaining 50-80 wt% of the mixture into the reaction container through 1-2 h under stirring, dropping 40-60% of the anionic emulsifier aqueous solution and 40-60% of the initiator aqueous solution into the reaction container through 2-3 h under stirring, preserving heat for 0.5-2 h at 60-80 ℃ after the dropping is completed, finally adding the remaining 40-60% of the initiator aqueous solution into the reaction container at one time, heating to 80-95 ℃ through 0.5-1 h, preserving heat for 0.5-2 h, and cooling.

Preferably, the monomer comprises 2-10 parts of acrylamide, 15-50 parts of methyl acrylate, 20-70 parts of ethyl acrylate and 10-45 parts of butyl acrylate.

Preferably, the nonionic emulsifier is nonylphenol polyoxyethylene ether.

Preferably, the anionic emulsifier is sodium dodecyl benzene sulfonate.

Preferably, the initiator is potassium persulfate.

2. The cationic water-based acrylic emulsion for the anticorrosion primer prepared by the method.

The invention has the beneficial effects that: the invention provides a cationic water-based acrylic emulsion for an anticorrosive primer and a preparation method thereof, wherein when the cationic water-based acrylic emulsion is prepared, through reasonably selecting raw materials, controlling the using amount of the raw materials and using specific preparation process conditions, the finally prepared cationic water-based acrylic emulsion has better film-forming performance, a paint film has better corrosion resistance and adhesive force, can be randomly matched with acid solutions or salt solutions such as phosphoric acid and the like without demulsification, does not need filtering and washing, can be directly used for preparing a coating in the next step, is more suitable for industrial production, and does not generate waste liquid. The method is simple and easy to operate, has low cost and is suitable for industrial production.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.