CN113416472A

CN113416472A - Water-based bi-component epoxy primer for racing helmet and preparation method thereof

Info

Publication number: CN113416472A
Application number: CN202110873773.0A
Authority: CN
Inventors: 冯兆均; 阮伟明; 施沃成; 施耀良; 李耀明
Original assignee: Yatu High Tech Materials Co ltd
Current assignee: Yatu High Tech Materials Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-09-21
Anticipated expiration: 2041-07-30
Also published as: CN113416472B

Abstract

The invention provides a water-based double-component epoxy primer for a racing car helmet, which consists of a component A and a component B in equal weight, wherein the component A comprises the following components in parts by weight: 30-50 parts of epoxy resin emulsion, 50-80 parts of primer slurry and 0.1-0.5 part of wetting agent, wherein the primer slurry comprises the following components in parts by weight: 15-30 parts of pure water, 2-8 parts of dispersing agent, 0.2-1 part of defoaming agent, 0.5-2 parts of anti-settling agent, 20-30 parts of pigment, 30-50 parts of filler, 2-10 parts of cosolvent and 1-2 parts of KH 5601; the component B comprises the following components in parts by weight: 25-35 parts of cosolvent, 15-30 parts of aliphatic polyamine curing agent and 20-40 parts of pure water. The invention also provides a preparation method of the water-based bi-component epoxy primer. The water-based bi-component epoxy primer provided by the invention has better sagging resistance, wear resistance, adhesive force, stability and water resistance.

Description

Water-based bi-component epoxy primer for racing helmet and preparation method thereof

Technical Field

The invention relates to an epoxy primer, in particular to a water-based bi-component epoxy primer for racing helmets and a preparation method thereof.

Background

At present, the development of the paint towards high-solid and water-based paint is a consensus in the paint field, and a system with zero VOC or low VOC and HAP is a research direction of novel paint. With the development of economy, the application of water-based paint products is more and more popular, and aluminum materials, galvanized sheets, stainless steel and the like are widely used in the fields of buildings, manufacturing and industry due to good corrosion resistance. The water-based epoxy anticorrosive paint has the advantages of low VOC content, small smell, safe use, capability of being cleaned by water, increasingly mature process technology, accordance with the requirements of environmental protection and energy conservation and the like.

Chinese patent application CN201710142184.9 discloses a 'two-component waterborne epoxy primer and a production process', which mixes and grinds wetting dispersant, 3/5 defoamer, titanium pigment, talcum powder, barium sulfate, antirust pigment, carbon black and a certain amount of deionized water to 40 mu m; adding the epoxy emulsion, the rest defoaming agent, the thickening agent and the deionized water, and dispersing and stirring uniformly to obtain a component A; uniformly mixing a curing agent and deionized water in proportion to obtain a component B; when in use, the component A and the component B are mixed and used according to the equivalent ratio of the amine to the epoxy of 3: 4. The problem with this patent when used in a racing helmet is: it has poor sagging resistance, wear resistance, adhesion, stability and water resistance.

Disclosure of Invention

The invention aims to provide a water-based double-component epoxy primer for racing helmets, which has better sagging resistance, wear resistance, adhesive force, stability and water resistance.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the waterborne two-component epoxy primer for the racing helmet is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 30-50 parts of epoxy resin emulsion, 50-80 parts of primer slurry and 0.1-0.5 part of wetting agent, wherein the primer slurry comprises the following components in parts by weight: 15-30 parts of pure water, 2-8 parts of dispersing agent, 0.2-1 part of defoaming agent, 0.5-2 parts of anti-settling agent, 20-30 parts of pigment, 30-50 parts of filler, 2-10 parts of cosolvent and 1-2 parts of KH 5601; the component B comprises the following components in parts by weight: 25-35 parts of cosolvent, 15-30 parts of aliphatic polyamine curing agent and 20-40 parts of pure water.

Further, the wetting agent is an organosilicon gemini surfactant Tego-4100.

Further, the dispersing agent is a high molecular weight block copolymer BYK190 containing pigment affinity groups.

Further, the defoaming agent disclosed by the invention is a polyether defoaming agent Tego 902W.

Further, the anti-settling agent is prepared by the following steps:

adding aluminum nitrate into ethanol, stirring until the mixture is uniformly mixed to obtain an aluminum nitrate solution, adding caffeic acid into the ethanol, stirring until the mixture is uniformly mixed to obtain a caffeic acid solution, adding the aluminum nitrate solution into the caffeic acid solution, stirring for 20-30 minutes to obtain a mixed solution, dropwise adding the mixed solution into fumed silica, stirring for 2-4 hours, then aging for 24 hours to obtain a mixture, washing the mixture for 3 times by using ethanol, drying for 24 hours at 80 ℃ to obtain mixed powder, and calcining the mixed powder for 3-5 hours at 450 ℃ in a nitrogen atmosphere to obtain the anti-settling agent.

Furthermore, in the preparation steps of the anti-settling agent, the concentration of the aluminum nitrate solution is 0.2g/mL, the concentration of the caffeic acid solution is 0.08g/mL, the proportion of the aluminum nitrate solution to the caffeic acid solution to the fumed silica is (9-11) mL:9g, and the heating rate during calcination is 5 ℃/min.

Further, the pigment is one or two of titanium dioxide and carbon black; the filler is one or more than two of talcum powder, barium sulfate and hollow microspheres. Wherein, the talcum powder is fine talcum powder with the grain diameter of 800-1250 meshes, and the barium sulfate is superfine barium sulfate with the grain diameter of 1250 meshes.

Further, the cosolvent disclosed by the invention consists of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4: 1; the threonine imidazole salt is prepared by the following steps:

adding threonine into water, stirring until the threonine is completely dissolved to obtain a threonine solution, dropwise adding the threonine solution into 1-butyl-3-methylimidazole hydroxide, magnetically stirring at room temperature for 70-75 hours to obtain a mixed solution, rotatably steaming the mixed solution until no liquid flows out, and then drying in vacuum at 60 ℃ for 24 hours to obtain the threonine imidazole salt.

Furthermore, in the preparation step of the threonine imidazolium salt, the ratio of threonine, water and 1-butyl-3-methylimidazole hydroxide is (0.5-1.5) mol to 25g (0.5-1.5) mol.

The invention also provides a preparation method of the waterborne two-component epoxy primer for the racing helmet.

In order to solve the technical problems, the technical scheme is as follows:

a preparation method of a water-based double-component epoxy primer for racing car helmets comprises the following steps:

s1, preparing primer slurry: adding pure water and cosolvent into a container, uniformly stirring at the speed of 300-;

s2.A component preparation: adding the epoxy resin solution into a container, stirring for 3-5 minutes at the speed of 300-;

s3.B component preparation: adding pure water, aliphatic polyamine curing agent and cosolvent into a container in sequence, and stirring for 15-20 minutes at the speed of 400-600 rpm to obtain the component B.

Compared with the prior art, the invention has the following beneficial effects:

1) the anti-settling agent used by the invention is prepared from aluminum nitrate, caffeic acid and fumed silica through the steps of dipping, drying, calcining and the like, and has a structure of fumed silica loaded with alumina, wherein the fumed silica can play a role in anti-settling, the alumina can play a role in wear resistance and abrasion resistance, and the caffeic acid can improve the binding force of the fumed silica and the alumina, so that the anti-settling agent can effectively improve the sag resistance and the wear resistance of the aqueous bi-component epoxy primer.

2) KH560 used in the invention is a silane coupling agent, which can play a role of an adhesion promoter and effectively improve the adhesion and water resistance of the aqueous bi-component epoxy primer.

3) The cosolvent used by the invention consists of cyclohexanediol monomethyl ether and threonine imidazole salt, wherein the cyclohexanediol monomethyl ether is an alcohol ether solvent which is dissolved by water and oil and can play a good dissolving-assisting role, and the threonine and 1-butyl-3-methylimidazole hydroxide are synthesized to form the cosolvent, so that the cosolvent has an ionic liquid structure, can play a good stabilizing role, and can effectively improve the stability and the water resistance of the aqueous bi-component epoxy primer.

Detailed Description

The present invention will be described in detail with reference to specific embodiments, and the exemplary embodiments and descriptions thereof herein are provided to explain the present invention but not to limit the present invention.

Example 1

The waterborne double-component epoxy primer for the racing helmet is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 40 parts of epoxy resin emulsion, 70 parts of primer slurry and 70 parts of organosilicon gemini structure surfactant Tego-41000.3 parts, wherein the primer slurry comprises the following components in parts by weight: 25 parts of pure water, 1904 parts of high molecular weight block copolymer BYK 1904 parts of pigment affinity group, 0.6 part of polyether defoamer Tego902W 0.6, 1.5 parts of anti-settling agent, 25 parts of titanium dioxide, 40 parts of fine talcum powder with the particle size of 800-1250 meshes, 5 parts of cosolvent and KH 5601.5 parts; the component B comprises the following components in parts by weight: 30 parts of cosolvent consisting of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4:1, 20 parts of aliphatic polyamine curing agent and 30 parts of pure water.

The anti-settling agent is prepared by the following steps:

adding aluminum nitrate into ethanol, stirring until the aluminum nitrate solution is uniformly mixed to obtain an aluminum nitrate solution with the concentration of 0.2g/mL, adding caffeic acid into the ethanol, stirring until the caffeic acid solution with the concentration of 0.08g/mL is uniformly mixed to obtain a caffeic acid solution, adding the aluminum nitrate solution into the caffeic acid solution, stirring for 25 minutes to obtain a mixed solution, dropwise adding the mixed solution into fumed silica, wherein the ratio of the aluminum nitrate solution to the caffeic acid solution to the fumed silica is 10mL to 9g, stirring for 3 hours, aging for 24 hours to obtain a mixture, washing the mixture for 3 times with ethanol, drying for 24 hours at 80 ℃ to obtain mixed powder, calcining the mixed powder for 4 hours at 450 ℃ in a nitrogen atmosphere to obtain an anti-settling agent, and heating at the temperature rising speed of 5 ℃/min during calcining.

The threonine imidazole salt is prepared by the following steps:

adding threonine into water, stirring until the threonine is completely dissolved to obtain a threonine solution, dropwise adding the threonine solution into 1-butyl-3-methylimidazole hydroxide, wherein the ratio of threonine to water to 1-butyl-3-methylimidazole hydroxide is 1mol:25g:1mol, magnetically stirring at room temperature for 72 hours to obtain a mixed solution, and performing rotary evaporation on the mixed solution until no liquid flows out, and then performing vacuum drying at 60 ℃ for 24 hours to obtain the imidazole threonine salt.

The preparation method of example 1 comprises the following steps:

s1, preparing primer slurry: adding pure water and cosolvent into a container, uniformly stirring at the speed of 400 revolutions per minute, then adding a dispersing agent, a defoaming agent, pigment, a filler, an anti-settling agent and KH560 while stirring, stirring for 20 minutes at the speed of 900 revolutions per minute, and grinding by using a sand mill until the fineness is less than or equal to 60 mu m to obtain primer slurry;

s2.A component preparation: adding the epoxy resin solution into a container, stirring for 4 minutes at the speed of 400 rpm, then adding the primer slurry obtained in the step S1 while stirring, stirring for 8 minutes at the speed of 500 rpm, then adding the wetting agent while stirring, and continuously stirring for 20 minutes to obtain a component A;

s3.B component preparation: adding pure water, aliphatic polyamine curing agent and cosolvent into a container in sequence, and stirring for 18 minutes at the speed of 500 revolutions per minute to obtain the component B.

Example 2

The waterborne double-component epoxy primer for the racing helmet is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 35 parts of epoxy resin emulsion, 80 parts of primer slurry and 80 parts of organosilicon gemini structure surfactant Tego-41000.1 parts, wherein the primer slurry comprises the following components in parts by weight: 30 parts of pure water, 1902 parts of high-molecular-weight block copolymer BYK containing pigment affinity groups, 902W 1 parts of polyether defoamer Tego902, 0.5 part of anti-settling agent, 27 parts of carbon black, 45 parts of superfine barium sulfate with the particle size of 1250 meshes, 2 parts of cosolvent and KH 5602 parts; the component B comprises the following components in parts by weight: 25 parts of cosolvent consisting of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4:1, 30 parts of aliphatic polyamine curing agent and 25 parts of pure water.

The anti-settling agent is prepared by the following steps:

adding aluminum nitrate into ethanol, stirring until the aluminum nitrate solution is uniformly mixed to obtain an aluminum nitrate solution with the concentration of 0.2g/mL, adding caffeic acid into the ethanol, stirring until the caffeic acid solution with the concentration of 0.08g/mL is uniformly mixed to obtain a caffeic acid solution, adding the aluminum nitrate solution into the caffeic acid solution, stirring for 20 minutes to obtain a mixed solution, dropwise adding the mixed solution into fumed silica, wherein the ratio of the aluminum nitrate solution to the caffeic acid solution to the fumed silica is 9mL to 9g, stirring for 2 hours, aging for 24 hours to obtain a mixture, washing the mixture for 3 times by using ethanol, drying for 24 hours at 80 ℃ to obtain mixed powder, calcining the mixed powder for 3 hours at 450 ℃ in a nitrogen atmosphere to obtain an anti-settling agent, and heating at the temperature rising speed of 5 ℃/min during calcining.

The threonine imidazole salt is prepared by the following steps:

adding threonine into water, stirring until the threonine is completely dissolved to obtain a threonine solution, dropwise adding the threonine solution into 1-butyl-3-methylimidazole hydroxide, magnetically stirring at room temperature for 75 hours to obtain a mixed solution, performing rotary evaporation on the mixed solution until no liquid flows out, and performing vacuum drying at 60 ℃ for 24 hours to obtain the threonine imidazole salt, wherein the ratio of threonine to water to 1-butyl-3-methylimidazole hydroxide is 0.5mol:25g:0.5 mol.

The preparation method of example 2 comprises the following steps:

s1, preparing primer slurry: adding pure water and cosolvent into a container, uniformly stirring at the speed of 350 r/min, then adding a dispersing agent, a defoaming agent, pigment, a filler, an anti-settling agent and KH560 while stirring, stirring for 21 minutes at the speed of 850 r/min, and grinding by using a sand mill until the fineness is less than or equal to 60 mu m to obtain primer slurry;

s2.A component preparation: adding the epoxy resin solution into a container, stirring for 4.5 minutes at the speed of 350 revolutions per minute, then adding the primer slurry obtained in the step S1 while stirring, stirring for 9 minutes at the speed of 450 revolutions per minute, then adding the wetting agent while stirring, and continuously stirring for 21 minutes to obtain a component A;

s3.B component preparation: adding pure water, aliphatic polyamine curing agent and cosolvent into a container in sequence, and stirring for 19 minutes at the speed of 450 rpm to obtain the component B.

Example 3

The waterborne double-component epoxy primer for the racing helmet is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 30 parts of epoxy resin emulsion, 75 parts of primer slurry and 75 parts of organosilicon gemini structure surfactant Tego-41000.5 parts, wherein the primer slurry comprises the following components in parts by weight: 15 parts of pure water, 1908 parts of high molecular weight block copolymer BYK 1908 parts of pigment affinity group, 0.8 part of polyether defoamer Tego902W 0.8, 1 part of anti-settling agent, 30 parts of carbon black, 30 parts of hollow microsphere, 8 parts of cosolvent and 5601 parts of KH; the component B comprises the following components in parts by weight: 32 parts of cosolvent consisting of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4:1, 15 parts of aliphatic polyamine curing agent and 40 parts of pure water.

The anti-settling agent is prepared by the following steps:

adding aluminum nitrate into ethanol, stirring until the aluminum nitrate solution is uniformly mixed to obtain an aluminum nitrate solution with the concentration of 0.2g/mL, adding caffeic acid into the ethanol, stirring until the caffeic acid solution with the concentration of 0.08g/mL is uniformly mixed to obtain a caffeic acid solution, adding the aluminum nitrate solution into the caffeic acid solution, stirring for 30 minutes to obtain a mixed solution, dropwise adding the mixed solution into fumed silica, wherein the ratio of the aluminum nitrate solution to the caffeic acid solution to the fumed silica is 11mL to 9g, stirring for 4 hours, aging for 24 hours to obtain a mixture, washing the mixture for 3 times by using ethanol, drying for 24 hours at 80 ℃ to obtain mixed powder, calcining the mixed powder for 5 hours at 450 ℃ in a nitrogen atmosphere to obtain an anti-settling agent, and heating at the temperature rising speed of 5 ℃/min during calcining.

The threonine imidazole salt is prepared by the following steps:

adding threonine into water, stirring until the threonine is completely dissolved to obtain a threonine solution, dropwise adding the threonine solution into 1-butyl-3-methylimidazole hydroxide, magnetically stirring at room temperature for 73 hours to obtain a mixed solution, performing rotary evaporation on the mixed solution until no liquid flows out, and performing vacuum drying at 60 ℃ for 24 hours to obtain the threonine imidazole salt, wherein the ratio of threonine to water to 1-butyl-3-methylimidazole hydroxide is 1.5mol:25g:1.5 mol.

The preparation method of example 3 comprises the following steps:

s1, preparing primer slurry: adding pure water and a cosolvent into a container, uniformly stirring at the speed of 300 revolutions per minute, then adding a dispersing agent, a defoaming agent, a pigment, a filler, an anti-settling agent and KH560 while stirring, stirring for 25 minutes at the speed of 800 revolutions per minute, and grinding by using a sand mill until the fineness is less than or equal to 60 mu m to obtain a primer slurry;

s2.A component preparation: adding the epoxy resin solution into a container, stirring for 5 minutes at the speed of 300 revolutions per minute, then adding the primer slurry obtained in the step S1 while stirring, stirring for 10 minutes at the speed of 400 revolutions per minute, then adding the wetting agent while stirring, and continuously stirring for 15 minutes to obtain a component A;

s3.B component preparation: adding pure water, aliphatic polyamine curing agent and cosolvent into a container in sequence, and stirring for 20 minutes at the speed of 400 rpm to obtain the component B.

Example 4

The waterborne double-component epoxy primer for the racing helmet is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 50 parts of epoxy resin emulsion, 50 parts of primer slurry and 50 parts of organosilicon gemini structure surfactant Tego-41000.2, wherein the primer slurry comprises the following components in parts by weight: 20 parts of pure water, 1906 parts of high molecular weight block copolymer BYK 1906 parts of pigment affinity group, 0.2 part of polyether defoamer Tego902W 0.2, 2 parts of anti-settling agent, 20 parts of titanium dioxide and carbon black, 50 parts of superfine barium sulfate and hollow microspheres with the particle size of 1250 meshes, 10 parts of cosolvent and KH 5601.8 parts; the component B comprises the following components in parts by weight: 35 parts of cosolvent consisting of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4:1, 25 parts of aliphatic polyamine curing agent and 20 parts of pure water.

The anti-settling agent is prepared by the following steps:

adding aluminum nitrate into ethanol, stirring until the aluminum nitrate solution is uniformly mixed to obtain an aluminum nitrate solution with the concentration of 0.2g/mL, adding caffeic acid into the ethanol, stirring until the caffeic acid solution with the concentration of 0.08g/mL is uniformly mixed to obtain a caffeic acid solution, adding the aluminum nitrate solution into the caffeic acid solution, stirring for 28 minutes to obtain a mixed solution, dropwise adding the mixed solution into fumed silica, wherein the ratio of the aluminum nitrate solution to the caffeic acid solution to the fumed silica is 9mL to 10mL to 9g, stirring for 2.5 hours, aging for 24 hours to obtain a mixture, washing the mixture for 3 times by using ethanol, drying for 24 hours at 80 ℃ to obtain mixed powder, calcining the mixed powder for 4.5 hours at 450 ℃ in a nitrogen atmosphere to obtain an anti-settling agent, and raising the temperature during calcination at 5 ℃/min.

The threonine imidazole salt is prepared by the following steps:

adding threonine into water, stirring until the threonine is completely dissolved to obtain a threonine solution, dropwise adding the threonine solution into 1-butyl-3-methylimidazole hydroxide, wherein the ratio of threonine to water to 1-butyl-3-methylimidazole hydroxide is 1mol:25g:1.5mol, magnetically stirring at room temperature for 70 hours to obtain a mixed solution, and performing rotary evaporation on the mixed solution until no liquid flows out, and then performing vacuum drying at 60 ℃ for 24 hours to obtain the imidazole threonine salt.

The preparation method of example 4 comprises the following steps:

s1, preparing primer slurry: adding pure water and cosolvent into a container, uniformly stirring at the speed of 500 revolutions per minute, then adding a dispersing agent, a defoaming agent, pigment, a filler, an anti-settling agent and KH560 while stirring, stirring for 15 minutes at the speed of 1000 revolutions per minute, and grinding by using a sand mill until the fineness is less than or equal to 60 mu m to obtain primer slurry;

s2.A component preparation: adding the epoxy resin solution into a container, stirring for 3 minutes at the speed of 500 revolutions per minute, then adding the primer slurry obtained in the step S1 while stirring, stirring for 5 minutes at the speed of 600 revolutions per minute, then adding the wetting agent while stirring, and continuously stirring for 25 minutes to obtain a component A;

s3.B component preparation: adding pure water, aliphatic polyamine curing agent and cosolvent into a container in sequence, and stirring for 15 minutes at the speed of 600 revolutions per minute to obtain the component B.

Reference example 1

The difference from example 1 is that: the anti-settling agent is replaced by pure gas-phase silicon dioxide, and the preparation step of the anti-settling agent is omitted.

Reference example 2

The difference from example 1 is that: the preparation steps of the anti-settling agent are changed as follows: adding aluminum nitrate into ethanol, stirring until the aluminum nitrate is uniformly mixed to obtain an aluminum nitrate solution with the concentration of 0.2g/mL, dropwise adding the aluminum nitrate solution into fumed silica, wherein the ratio of the aluminum nitrate solution to the fumed silica is 10mL to 9g, stirring for 2.5 hours, then aging for 24 hours to obtain a mixture, washing the mixture for 3 times by using ethanol, drying at 80 ℃ for 24 hours to obtain a mixed powder, calcining the mixed powder at 450 ℃ for 4.5 hours in a nitrogen atmosphere to obtain an anti-settling agent, and heating at the temperature rising speed of 5 ℃/min during calcination, namely, caffeic acid is not added in the preparation step of the anti-settling agent.

Reference example 3

The difference from example 1 is that: KH560 is not included in the components of the primer paste.

Reference example 4

The difference from example 1 is that: the cosolvent is replaced by pure cyclohexanediol monomethyl ether, namely the cosolvent does not contain threonine imidazolium salt, and the preparation step of the threonine imidazolium salt is omitted.

Comparative example: example 1 of chinese patent application No. CN 201710142184.9.

Preparation of a sample plate:

the A component and the B component of the examples 1-4, the reference examples 1-4 and the comparative example are respectively mixed, the viscosity is adjusted to 25 seconds by adding a proper amount of water, the mixture is filtered after standing and defoaming, the mixture is brushed on a glass steel plate by referring to GB/T1727 1992, the glass steel plate is placed in an oven to be flashed for 5 minutes at 70 ℃, then the glass steel plate is heated to 120 ℃ to be baked for 30 minutes, and the sample plate is obtained after cooling to the room temperature.

The first experimental example: sag resistance test

The maximum wet film thickness without sagging of examples 1-4 and comparative example were determined with reference to GB/T9264-:

TABLE 1

	Maximum Wet film thickness (μm) without sagging
		Example 1	290
Example 2	280
		Example 3	270
Example 4	285
		Comparative example	95

As can be seen from Table 1, the maximum wet film thickness without sagging for inventive examples 1-4 is significantly greater than the comparative examples, indicating that the waterborne two-component epoxy primers prepared by the present invention have better sag resistance.

Experiment example two: abrasion resistance test

The method comprises the steps of adopting an RCA (Rolling circle rolling) paper tape abrasion tester for testing, fixing a sample plate right below a grinding head of the paper tape abrasion tester, adjusting a sliding bolt and a swinging arm, setting the number of revolutions, starting a machine, observing the abrasion condition of a coating film on the sample plate after 5 revolutions of testing, recording the number of revolutions required by the coating film in abrasion, and indicating that the abrasion resistance is better when the number of revolutions of abrasion is larger. The test results are shown in table 2:

TABLE 2

As can be seen from Table 2, the numbers of wear-through rotations of inventive examples 1-4 are significantly greater than those of comparative examples, indicating that the waterborne two-component epoxy primers prepared according to the present invention have better abrasion resistance. The components of reference examples 1 and 2 are different from example 1, compared with example 1, the abrasion-through revolution number of reference example 1 is greatly reduced, which shows that the alumina in the anti-settling agent used by the invention can effectively improve the wear resistance of the water-based two-component epoxy primer; the small reduction in the number of wearing revolutions of reference example 2 shows that caffeic acid added in the preparation step of the anti-settling agent according to the present invention is effective in improving the binding force of fumed silica and alumina.

Experiment example three: adhesion test

The adhesion grades of examples 1-4, reference example 3 and comparative example were determined by cross-hatch method with reference to GB/T9286-1998, the lower the adhesion grade, the better the adhesion, and the test results are shown in Table 3:

TABLE 3

	Adhesion rating (grade)
		Example 1	0
Example 2	0
		Example 3	0
Example 4	0
		Reference example 3	1
Comparative example	1

As can be seen from Table 3, the adhesion grades of examples 1-4 of the present invention are lower than those of the comparative examples, indicating that the waterborne two-component epoxy primer prepared by the present invention has better adhesion. The composition of reference example 3 differs from that of example 1, and the adhesion rating of reference example 3 is increased to 1 compared to example 1, indicating that KH560 used in the present invention is effective in improving the adhesion of a water-borne two-component epoxy primer.

Experimental example four: stability test

800mL of each of examples 1 to 4, reference example 4 and comparative example was placed in a glass bottle, the glass bottle was sealed and placed in an oven at 50 ℃ for 7 days, and the glass bottle was taken out and recorded for a viscosity change rate of | viscosity before test |/viscosity before test × 100%, the lower the viscosity change rate, the better the stability, and the test results are shown in Table 4:

TABLE 4

As can be seen from Table 4, the viscosity change rates of the inventive examples 1-4 are significantly lower than those of the comparative examples, indicating that the waterborne two-component epoxy primers prepared by the present invention have better stability. The difference between the components of reference example 4 and example 1, and the viscosity change rate of reference example 4 is greatly increased compared with example 1, which shows that the threonine imidazole salt in the cosolvent used in the invention can effectively improve the stability of the aqueous two-component epoxy primer.

Experimental example five: water resistance test

The water-resistant foaming times of examples 1-4, reference examples 3-4 and comparative example were measured with reference to GB/T1733-1993, and the longer the water-resistant foaming time, the better the water resistance, and the test results are shown in Table 5:

TABLE 5

	Water-resistant blister time (hours)
		Example 1	Greater than 240
Example 2	Greater than 240
		Example 3	Greater than 240
Example 4	Greater than 240
		Reference example 3	192
Reference example 4	180
		Comparative example	108

As can be seen from Table 5, the water-resistant blistering times of inventive examples 1-4 are significantly longer than those of comparative examples, indicating that the waterborne two-component epoxy primers prepared according to the present invention have better water resistance. The difference between the compositions of reference examples 3-4 and example 1, and the water-resistant foaming time of reference examples 3 and 4 was reduced compared to example 1, indicating that both KH560 and the imidazole threonine salt in the co-solvent used in the present invention are effective in improving the water resistance of the waterborne two-component epoxy primer.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The water-based double-component epoxy primer for the racing helmet is characterized in that: the waterborne bi-component epoxy primer is composed of a component A and a component B which are equal in weight, wherein the component A comprises the following components in parts by weight: 30-50 parts of epoxy resin emulsion, 50-80 parts of primer slurry and 0.1-0.5 part of wetting agent, wherein the primer slurry comprises the following components in parts by weight: 15-30 parts of pure water, 2-8 parts of dispersing agent, 0.2-1 part of defoaming agent, 0.5-2 parts of anti-settling agent, 20-30 parts of pigment, 30-50 parts of filler, 2-10 parts of cosolvent and 1-2 parts of KH 5601; the component B comprises the following components in parts by weight: 25-35 parts of cosolvent, 15-30 parts of aliphatic polyamine curing agent and 20-40 parts of pure water.

2. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the wetting agent is an organosilicon gemini surfactant Tego-4100.

3. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the dispersing agent is a high molecular weight block copolymer BYK190 containing pigment affinity groups.

4. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the defoaming agent is polyether defoaming agent Tego 902W.

5. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the anti-settling agent is prepared by the following steps:

6. The two-component waterborne epoxy primer for racing helmets according to claim 5, wherein: in the preparation step of the anti-settling agent, the concentration of the aluminum nitrate solution is 0.2g/mL, the concentration of the caffeic acid solution is 0.08g/mL, the proportion of the aluminum nitrate solution, the caffeic acid solution and the fumed silica is (9-11) mL and (9-11) mL to 9g, and the heating rate during calcination is 5 ℃/min.

7. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the pigment is one or two of titanium dioxide and carbon black; the filler is one or more than two of talcum powder, barium sulfate and hollow microspheres.

8. The two-component waterborne epoxy primer for racing helmets according to claim 1, wherein: the cosolvent consists of cyclohexanediol monomethyl ether and threonine imidazole salt in a mass ratio of 4: 1; the threonine imidazole salt is prepared by the following steps:

9. The two-component waterborne epoxy primer for racing helmets according to claim 8, wherein: in the preparation step of the threonine imidazolium salt, the proportion of threonine, water and 1-butyl-3-methylimidazole hydroxide is (0.5-1.5) mol:25g (0.5-1.5) mol.

10. The method for preparing the water-based two-component epoxy primer for the racing helmet, according to any one of claims 1 to 9, wherein the method comprises the following steps: the method comprises the following steps: