阅读说明：本技术 水性有机硅改性脂肪族多元胺环氧固化剂的制备方法 (Preparation method of waterborne organic silicon modified aliphatic polyamine epoxy curing agent ) 是由 渠源 孔凡振 荆蒙蒙 杨甜甜 李波 陈僮 李朋涛 卢海峰 于 2021-01-13 设计创作，主要内容包括：本发明公开了一种水性有机硅改性脂肪族多元胺环氧固化剂的制备方法,属于固化剂技术领域,其特征在于包括如下步骤：将蒸馏水与烯丙胺按质量比2:1的投料比投入到反应容器中；并加入助剂、分散剂、稳定剂；投料完成后,滴加乙酸；本发明的有益效果是：通过硅氢加成获得水性有机硅改性脂肪族多元胺环氧固化剂,解决了油系溶剂易挥发易造成使用者中毒对环境不友好的问题；在水系反应原理的基础上创造性的加入水溶性的乙酸,解决了固化后的环氧树脂存在吸水率高,耐高温性能差,耐老化性差,不耐腐蚀,易变色问题；在脂肪族多元胺上引进了有机硅,并且做成了水性乳液解决了上述问题,并且该方法具有生产安全简单,物料利用率高,环境污染小等特点。(The invention discloses a preparation method of a waterborne organic silicon modified aliphatic polyamine epoxy curing agent, belonging to the technical field of curing agents and characterized by comprising the following steps: putting distilled water and allylamine into a reaction container according to a mass ratio of 2: 1; and adding an auxiliary agent, a dispersing agent and a stabilizing agent; after the feeding is finished, dropwise adding acetic acid; the invention has the beneficial effects that: the water-based organic silicon modified aliphatic polyamine epoxy curing agent is obtained through hydrosilylation, so that the problem that the oil solvent is easy to volatilize and cause poisoning of a user, and is not friendly to the environment is solved; the water-soluble acetic acid is creatively added on the basis of a water system reaction principle, so that the problems of high water absorption, poor high-temperature resistance, poor aging resistance, corrosion resistance and easy color change of the cured epoxy resin are solved; organosilicon is introduced into aliphatic polyamine, and the problem is solved by preparing the aliphatic polyamine into aqueous emulsion.)

1. The preparation method of the waterborne organic silicon modified aliphatic polyamine epoxy curing agent is characterized by comprising the following steps:

1) putting distilled water and allylamine into a reaction container according to a mass ratio of 2: 1;

2) adding an emulsifier in an amount of 5-8% by weight of the allylamine added;

3) adding a dispersant in an amount of 0.5-2% by weight of the allylamine added;

4) adding stabilizer in 0.2-1 wt% of allylamine;

5) after the feeding is finished, heating to 50-60 ℃ at a stirring speed of 3000-5000 r/min, and then dropwise adding acetic acid, wherein the mass ratio of the dropwise adding amount of the acetic acid to the mass ratio of the allylamine is 1:1, and the dropwise adding time is 2-4 h;

6) after the dropwise addition is finished, keeping the temperature at 60-70 ℃ and reacting for 1-2 h;

7) after the heat preservation reaction is finished, the temperature is raised to 85-95 ℃, and a catalyst is added according to 0.1-0.5 percent of the weight of the allylamine;

8) adding tetramethyldisiloxane according to 50% of the mass of the allylamine, wherein the dripping time is 1-2 h;

9) after the addition is finished, the reaction is carried out for 3 to 4 hours at the temperature of between 85 and 95 ℃;

10) after the reaction is finished, the temperature is raised to 100-105 ℃, the powdery sodium hydroxide is added according to 100 percent of the mass of the charged allylamine, the charging time is 1-2 h, the temperature is continuously kept at 105-110 ℃ after the charging is finished, and the reaction is carried out for 2-3 h, thus obtaining the required product.

2. The preparation method of the water-based organic silicon modified aliphatic polyamine epoxy curing agent as claimed in claim 1, wherein the assistant is one or a mixture of two of fatty alcohol polyoxyethylene nonaether and alkylphenol polyoxyethylene decaether.

3. The method for preparing the waterborne organosilicon modified aliphatic polyamine epoxy hardener as claimed in claim 1, wherein the dispersant is one or a mixture of polyethylene glycol 2000 and polyethylene glycol 400.

4. The preparation method of the waterborne organosilicon modified aliphatic polyamine epoxy hardener as claimed in claim 1, wherein the stabilizer is one or a mixture of two of hydroxymethyl cellulose or hydroxypropyl cellulose.

5. The preparation method of the waterborne organosilicon modified aliphatic polyamine epoxy curing agent as claimed in claim 1, wherein the catalyst is one or a mixture of two of platinum catalyst and rhodium catalyst.

The technical field is as follows:

the invention belongs to the technical field of curing agents, and particularly relates to a preparation method of a waterborne organic silicon modified aliphatic polyamine epoxy curing agent.

Background art:

the aliphatic polyamine epoxy curing agent can enable epoxy to be crosslinked and cured at medium and low temperature, and is low in dosage, but has the problems of high volatility, high toxicity, no environmental protection, high harm to the body of a user and the like in the using process, and the cured epoxy resin has the problems of high water absorption, poor high temperature resistance, poor aging resistance, no corrosion resistance, poor adhesion, easy color change and the like. The application of the aliphatic polyamine epoxy curing agent is limited.

The invention content is as follows:

in order to solve the problems and overcome the defects of the prior art, the invention provides a preparation method of a water-based organic silicon modified aliphatic polyamine epoxy curing agent, which can effectively solve the problems that an oil solvent is easy to volatilize, a user is easy to poison and the environment is not friendly in the using process of the aliphatic polyamine epoxy curing agent.

The specific technical scheme for solving the technical problems comprises the following steps: the preparation method of the waterborne organic silicon modified aliphatic polyamine epoxy curing agent is characterized by comprising the following steps:

1) putting distilled water and allylamine into a reaction container according to a mass ratio of 2: 1;

2) adding an auxiliary agent in an amount of 5-8% by weight of the allylamine;

3) adding a dispersant in an amount of 0.5-2% by weight of the allylamine added;

4) adding stabilizer in 0.2-1 wt% of allylamine;

5) after the feeding is finished, heating to 50-60 ℃ at a stirring speed of 3000-5000 r/min, and then dropwise adding acetic acid, wherein the mass ratio of the dropwise adding amount of the acetic acid to the mass ratio of the allylamine is 1:1, and the dropwise adding time is 2-4 h;

6) after the dropwise addition is finished, keeping the temperature at 60-70 ℃ and reacting for 1-2 h;

7) after the heat preservation reaction is finished, the temperature is raised to 85-95 ℃, and a catalyst is added according to 0.1-0.5 percent of the weight of the allylamine;

8) adding tetramethyldisiloxane according to 50% of the mass of the allylamine, wherein the dripping time is 1-2 h;

9) after the addition is finished, the reaction is carried out for 3 to 4 hours at the temperature of between 85 and 95 ℃;

10) after the reaction is finished, the temperature is raised to 100-105 ℃, the powdery sodium hydroxide is added according to 100 percent of the mass of the charged allylamine, the charging time is 1-2 h, the temperature is continuously kept at 105-110 ℃ after the charging is finished, and the reaction is carried out for 2-3 h, thus obtaining the required product.

The auxiliary agent is one or a mixture of two of fatty alcohol polyoxyethylene nonaether or alkylphenol polyoxyethylene decaether.

The dispersant is polyethylene glycol 2000 or polyethylene glycol 400 or a mixture of the two.

The stabilizer is one or a mixture of two of hydroxymethyl cellulose or hydroxypropyl cellulose.

The catalyst is one or a mixture of two of a platinum catalyst and a rhodium catalyst.

The invention has the beneficial effects that:

1. the invention creatively obtains the waterborne organic silicon modified aliphatic polyamine epoxy curing agent through hydrosilylation in the state of a water-based solvent, and effectively solves the problems that the oil-based solvent is easy to volatilize in the using process of the aliphatic polyamine epoxy curing agent, the poisoning of a user is easy to cause, and the environmental friendliness is realized;

2. the water-soluble acetic acid is creatively added on the basis of a water system reaction principle, so that the problems of high water absorption rate, poor high-temperature resistance, poor aging resistance, no corrosion resistance, easy color change and the like of the cured epoxy resin are solved;

3. the invention solves the problems by introducing organosilicon into aliphatic polyamine and preparing into aqueous emulsion, and the method has the characteristics of safe and simple production, high material utilization rate, small environmental pollution and the like.

The specific implementation mode is as follows:

in the description of the invention, specific details are given only to enable a full understanding of the embodiments of the invention, but it should be understood by those skilled in the art that the invention is not limited to these details for the implementation. In other instances, well-known structures and functions have not been described or shown in detail to avoid obscuring the points of the embodiments of the invention. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific implementation mode of the invention is as follows:

the preparation method of the waterborne organic silicon modified aliphatic polyamine epoxy curing agent is characterized by comprising the following steps:

1) putting distilled water and allylamine into a reaction container according to a mass ratio of 2: 1;

2) adding an auxiliary agent in an amount of 5-8% by weight of the allylamine;

3) adding a dispersant in an amount of 0.5-2% by weight of the allylamine added;

4) adding stabilizer in 0.2-1 wt% of allylamine;

5) after the feeding is finished, heating to 50-60 ℃ at a stirring speed of 3000-5000 r/min, and then dropwise adding acetic acid, wherein the mass ratio of the dropwise adding amount of the acetic acid to the mass ratio of the allylamine is 1:1, and the dropwise adding time is 2-4 h;

6) after the dropwise addition is finished, keeping the temperature at 60-70 ℃ and reacting for 1-2 h;

7) after the heat preservation reaction is finished, the temperature is raised to 85-95 ℃, and a catalyst is added according to 0.1-0.5 percent of the weight of the allylamine;

8) adding tetramethyldisiloxane according to 50% of the mass of the allylamine, wherein the dripping time is 1-2 h;

9) after the addition is finished, the reaction is carried out for 3 to 4 hours at the temperature of between 85 and 95 ℃;

10) after the reaction is finished, the temperature is raised to 100-105 ℃, the powdery sodium hydroxide is added according to 100 percent of the mass of the charged allylamine, the charging time is 1-2 h, the temperature is continuously kept at 105-110 ℃ after the charging is finished, and the reaction is carried out for 2-3 h, thus obtaining the required product.

The auxiliary agent is one or a mixture of two of fatty alcohol polyoxyethylene nonaether and alkylphenol polyoxyethylene decaether.

The dispersant is polyethylene glycol 2000 or polyethylene glycol 400 or a mixture of the two.

The stabilizer is one or a mixture of two of hydroxymethyl cellulose or hydroxypropyl cellulose.

The catalyst is one or a mixture of two of a platinum catalyst and a rhodium catalyst.

Example 1

2280g of distilled water and 1140g of allylamine were put into a 10L three-necked flask, and 60 g of an auxiliary, 6.84g of a dispersant and 3.42 g of a stabilizer were added. Heating to 55 ℃ at a stirring speed of 3500r/min, dropwise adding 1200g of acetic acid for 2h, keeping the reaction temperature at 65 ℃ after dropwise adding, and reacting for 70 min. After the reaction, the temperature was raised to 90 ℃, 2.4g of catalyst was added, 1340g of tetramethyldisiloxane was added dropwise over 75min, and after the addition was complete, the reaction temperature was maintained at 95 ℃ for 3.5 h. After the reaction is finished, the temperature is increased to 100 ℃, 800 g of sodium hydroxide powder is added, the adding time is 90min, the temperature is kept at 106 ℃ after the adding is finished, and the reaction is carried out for 2 h. The reaction rate of allylamine was 95.86% as determined by liquid chromatography.

The auxiliary agent comprises the following components in percentage by weight: fatty alcohol polyoxyethylene nonaether; the dispersing agent consists of the following components in percentage by weight: polyethylene glycol 200075%, polyethylene glycol 40025%: the stabilizer comprises 85 percent of hydroxymethyl cellulose and 15 percent of hydroxypropyl cellulose by weight percentage; the catalyst consists of the following components in percentage by weight: 90% of platinum catalyst and 10% of rhodium catalyst.

Example 2

2280g of distilled water and 1140g of allylamine were put into a 10L three-necked flask, 57 g of an auxiliary, 22.8g of a dispersant and 2.28 g of a stabilizer were added. Under the stirring speed of 4000r/min, 1200g of acetic acid is dripped when the temperature is raised to 50 ℃, the dripping time is 2 hours, the reaction temperature is kept at 70 ℃ after the dripping is finished, and the reaction is carried out for 90 min. After the reaction, the temperature was raised to 85 ℃, 5.7g of catalyst was added, 1340g of tetramethyldisiloxane was added dropwise over 95min, and after the addition was complete, the reaction temperature was maintained at 90 ℃ for 4 h. After the reaction is finished, the temperature is raised to 105 ℃, 800 g of sodium hydroxide powder is added, the adding time is 85min, the temperature is kept at 110 ℃ after the adding is finished, and the reaction is carried out for 2 h. The allylamine reaction rate was 96.64% as determined by liquid chromatography.

The auxiliary agent comprises the following components in percentage by weight: 75% of fatty alcohol polyoxyethylene nonaether and 25% of alkylphenol polyoxyethylene decaether; the dispersing agent consists of the following components in percentage by weight: polyethylene glycol 200085%, polyethylene glycol 40015%: the stabilizer consists of 90 percent of hydroxymethyl cellulose and 10 percent of hydroxypropyl cellulose by weight percentage; the catalyst is a platinum catalyst.

Example 3

2280g of distilled water and 1140g of allylamine were put into a 10L three-necked flask, 78.2 g of an auxiliary, 15.63g of a dispersant and 6.82 g of a stabilizer were added. Under the stirring speed of 5000r/min, 1200g of acetic acid is dripped when the temperature is raised to 60 ℃, the dripping time is 4h, the reaction temperature is kept at 60 ℃ after the dripping is finished, and the reaction is carried out for 120 min. After the reaction, the temperature is raised to 95 ℃, 4.5g of catalyst is added, 1340g of tetramethyldisiloxane is added dropwise for 90min, and after the dropwise addition is finished, the reaction temperature is kept at 95 ℃ for reaction for 3 h. After the reaction is finished, the temperature is increased to 103 ℃, 800 g of sodium hydroxide powder is added, the adding time is 100min, the temperature is kept at 108 ℃ after the adding is finished, and the reaction is carried out for 3 h. The reaction rate of allylamine was 97.02% as determined by liquid chromatography.

The auxiliary agent comprises the following components in percentage by weight: fatty alcohol polyoxyethylene nonaether; the dispersant is polyethylene glycol 2000: the stabilizer is hydroxymethyl cellulose; the catalyst consists of the following components in percentage by weight: 95% of platinum catalyst and 5% of rhodium catalyst.

Example 4

2280g of distilled water and 1140g of allylamine were put into a 10L three-necked flask, and 91.2 g of an auxiliary, 14.11g of a dispersant and 2.28 g of a stabilizer were added. Under the stirring speed of 3000r/min, 1200g of acetic acid is dripped when the temperature is raised to 52 ℃, the dripping time is 3h, the reaction temperature is kept at 62 ℃ after the dripping is finished, and the reaction is carried out for 60 min. After the reaction, the temperature was raised to 87 ℃, 1.14g of catalyst was added, 1340g of tetramethyldisiloxane was added dropwise over a period of 60min, and after the addition was complete, the reaction temperature was maintained at 88 ℃ for 3 h. After the reaction is finished, the temperature is increased to 102 ℃, 800 g of sodium hydroxide powder is added, the adding time is 60min, and the temperature is kept at 105 ℃ after the adding is finished, so that the reaction is carried out for 2.5 h. The allylamine reaction rate was 96.32% as determined by liquid chromatography.

The auxiliary agent comprises the following components in percentage by weight: 90% of fatty alcohol polyoxyethylene nonaether and 10% of alkylphenol polyoxyethylene decaether; the dispersing agent consists of the following components in percentage by weight: polyethylene glycol 200065%, polyethylene glycol 40035%: the stabilizer comprises 97 percent of hydroxymethyl cellulose and 3 percent of hydroxypropyl cellulose by weight percentage; the catalyst consists of the following components in percentage by weight: 88% of platinum catalyst and 12% of rhodium catalyst.

In order to more intuitively show the process advantages of the waterborne organic silicon modified aliphatic polyamine epoxy curing agent, the invention is compared with the same process by adopting a replacement method,

comparative example one:

the preparation method is that the oily organic silicon modified aliphatic polyamine epoxy curing agent is prepared by taking toluene as a solvent for preparing the polyamine epoxy curing agent disclosed in the preparation method of siloxane-containing diamine of the national invention patent 201610794132.5 by way of reference, and the comparison is carried out;

comparative example two:

the preparation method is the same as the first embodiment except that: in the preparation process of the comparative example, acetic acid was not added;

comparative example three:

the preparation method is the same as the first comparative example except that: in the preparation process of this comparative example, acetic acid was added;

the above examples and comparative examples were carried out using the national standard: HG/T3344-;

table 1: influence of different processes on product quality

From the above table data analysis, it can be seen that:

1. from comparative example 1, it can be seen by data analysis that: the oily system is adopted in the comparative example 1, so that the toluene is not friendly in smell, has great harm to the environment, is poor in high temperature resistance and is easy to foam;

2. from comparative example 2, it can be seen from data analysis that: the comparative example 2 adopts an aqueous system, is friendly to smell and less harmful to the environment, but has poor high temperature resistance and easy foaming due to no addition of acetic acid, and has poor effect compared with the invention in aging resistance and color stability;

3. from comparative example 3, it can be seen by data analysis that: the oily system adopted in the comparative example 3 is not friendly to the smell of toluene and has great harm to the environment, particularly, after the acetic acid is added, the oily curing agent is separated due to the fact that the acetic acid is not dissolved in the toluene after the acetic acid is added, and the phenomena of poor high temperature resistance and cracking of the product can occur due to the fact that the acetic acid can not be dissolved in the toluene in the using process.

The various performances of the waterborne organic silicon modified aliphatic polyamine epoxy curing agent prepared by the invention are superior to those of epoxy curing agents existing in the market.

In summary, the following steps:

1. the invention creatively obtains the waterborne organic silicon modified aliphatic polyamine epoxy curing agent through hydrosilylation in the state of a water-based solvent, and effectively solves the problems that the oil-based solvent is easy to volatilize in the using process of the aliphatic polyamine epoxy curing agent, the poisoning of a user is easy to cause, and the environmental friendliness is realized;

2. the water-soluble acetic acid is creatively added on the basis of a water system reaction principle, so that the problems of high water absorption rate, poor high-temperature resistance, poor aging resistance, no corrosion resistance, easy color change and the like of the cured epoxy resin are solved;

3. the invention solves the problems by introducing organosilicon into aliphatic polyamine and preparing into aqueous emulsion, and the method has the characteristics of safe and simple production, high material utilization rate, small environmental pollution and the like.