阅读说明：本技术 一种高铁车轴用水性抗石击消音涂料及其制备方法 (Water-based stone-impact-resistant silencing coating for high-speed rail axle and preparation method thereof ) 是由 裴清海 韩连山 田计青 朱翠平 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种高铁车轴用水性抗石击消音涂料,其由丙烯酸复配乳液、分散剂、润湿剂、消泡剂、功能性复合填料、颜填料、触变剂、成膜助剂、pH调节剂、增稠剂和去离子水组成。所述的丙烯酸复配乳液由苯乙烯-丙烯酸酯乳液、丙烯酸酯共聚乳液组成,所述功能性复合填料由云母粉和硅藻土组成。本发明提供的水性抗石击消音涂料具有阻尼有效温域宽、固含量高、抗流挂性佳、触变性好、一次成膜厚度大的特点；制备工艺简单、涂装效率高,涂膜柔韧性好,抗石击和消音降噪效果明显,附着力优异,耐候性和耐盐雾性优良；该涂料以水为溶剂,低VOCs,绿色环保,可以完全替代传统的溶剂型涂料,用于高铁车轴表面涂装。(The invention discloses a water-based stone-impact-resistant noise-reduction coating for a high-speed rail axle, which consists of an acrylic acid compound emulsion, a dispersing agent, a wetting agent, a defoaming agent, a functional composite filler, a pigment filler, a thixotropic agent, a film-forming assistant, a pH regulator, a thickening agent and deionized water. The acrylic acid compound emulsion is composed of styrene-acrylate emulsion and acrylate copolymer emulsion, and the functional composite filler is composed of mica powder and diatomite. The water-based stone-impact-resistant silencing coating provided by the invention has the characteristics of wide damping effective temperature range, high solid content, good sagging resistance, good thixotropy and large thickness of one-time film forming; the coating has the advantages of simple preparation process, high coating efficiency, good coating flexibility, obvious stone impact resistance, noise reduction and noise reduction effects, excellent adhesive force, and excellent weather resistance and salt spray resistance; the coating takes water as a solvent, has low VOCs, is green and environment-friendly, can completely replace the traditional solvent-based coating, and is used for coating the surface of a high-speed rail axle.)

1. The water-based stone-impact-resistant silencing coating for the high-speed rail car axle is characterized by comprising the following components in parts by mass: 60-66 parts of acrylic acid compound emulsion, 0.1-0.3 part of dispersant, 2.0-3.0 parts of wetting agent, 0.1-0.3 part of defoaming agent, 10-14 parts of functional composite filler, 6-8 parts of pigment and filler, 2.0-4.0 parts of film forming additive, 0.5-2.5 parts of thixotropic agent, 0.1-0.3 part of pH regulator, 1.0-3.0 parts of thickener and 100 parts of deionized water.

2. The water-based stone-impact-resistant noise-reduction coating for the high-speed rail vehicle axle according to claim 1, wherein the acrylic acid compound emulsion is prepared by compounding styrene-acrylate emulsion and acrylate copolymer emulsion, and the two components have the following mass ratio: (2-4): 1.

3. the water-based stone-impact-resistant noise-reduction coating for the high-speed rail vehicle axle as claimed in claim 2, wherein the acrylic acid compound emulsion is one or a mixture of two of styrene-acrylate emulsion selected from NeoCrylA-1110 of Dismann, NeoCrylA-1110, acrylate copolymer emulsion selected from self-crosslinking water-based acrylic resin R-1199 of New materials GmbH, Tesman, NeoCrylA-1110.

4. The water-based stone chip resistant noise damping coating for high-speed rail car axles as claimed in claim 1, wherein the dispersant is one or a mixture of ammonium salt solution and sodium salt solution of acrylate copolymer.

5. The water-based stone-impact-resistant noise-reducing coating for the high-speed rail axle as claimed in claim 1, wherein the wetting agent is a nonionic surfactant; the defoaming agent is polyether siloxane copolymer.

6. The water-based stone-impact-resistant noise-reducing coating for the high-speed rail vehicle axle according to claim 1, wherein the functional composite filler is formed by mixing mica powder and diatomite; the pigment and filler is any one or a mixture of more of rutile titanium dioxide, carbon black, zinc phosphate and aluminum tripolyphosphate.

7. The water-based stone impact resistant and sound damping coating for the high-speed rail car axle of claim 6, wherein the mica powder is 1250-mesh mica powder of Wanqiao sericite GmbH, Chuzhou or 1250-mesh mica powder of King Sharp mineral GmbH, and the diatomite is 1250-mesh diatomite of Yunlin mineral GmbH, Jilin, or 1250-mesh diatomite of Jungang diatomite GmbH, Yixing.

8. The water-based stone-impact-resistant noise-reducing coating for the high-speed rail vehicle axle as claimed in claim 1, wherein the thixotropic agent is any one or a mixture of two of inorganic hydrophilic fumed silica and associative polyurethane; the film-forming auxiliary agent is any one or mixture of alcohol esters and alcohol ethers; the pH regulator is an alcamine, and the alcamine is any one of 2-amino-2-methyl-1-propanol or dimethylaminoethanol serving as a main component.

9. The water-based stone-impact-resistant noise-reducing coating for the high-speed rail axle as claimed in claim 1, wherein the thickener is an associative polyurethane thickener.

10. A method for preparing the water-based stone-impact-resistant sound-deadening coating for the high-speed rail axle according to any one of claims 1 to 9, which comprises the following steps:

weighing the components according to the formula ratio, firstly adding deionized water, a dispersing agent, a defoaming agent of 1/2 and a wetting agent of 2/3 under stirring at the rotating speed of 400r/min for 300-; grinding the pre-dispersed slurry by a sand mill until the fineness is less than 30 mu m to obtain ground slurry; adding the styrene-acrylate emulsion, the acrylate copolymer emulsion, the pH regulator, the defoamer of 1/2, the wetting agent of 1/3, the film-forming aid and the thixotropic agent into the ground slurry under the stirring of 600-800r/min, wherein the adding amount of the pH regulator is that the pH value of the slurry is regulated to 9.0-9.5, stirring for 10-15min after the adding is finished, then regulating the viscosity to 65000-80000mPa & s by using the thickening agent, and stirring for 5-10min after the adding is finished to obtain the finished product of the waterborne stone-impact-resistant sound-deadening coating.

Technical Field

The invention relates to the field of water-based paint, in particular to water-based stone-impact-resistant silencing paint for high-speed rail axles and a preparation method thereof.

Background

In recent decades, the high-speed train in China is continuously researched and innovated through introducing, digesting and absorbing foreign technologies, and gradually forms a technology with independent intellectual property rights in the aspects of part supply, system integration, intelligent control, whole vehicle assembly and the like. The process of domestic substitution of the main bearing parts of high-speed rail vehicles, namely axles and wheel sets, is continuously promoted, and the main bearing parts of the high-speed rail vehicles are subjected to severe tests in natural and artificial environments in the whole life cycle operation process, and have the basic requirements of rust prevention, corrosion prevention and stone impact resistance on the surfaces. With the improvement of the living standard and the comfortable travel experience of the public, the noise reduction and silencing treatment of the axle and the wheel set also becomes a necessary option.

In order to meet the requirements, the conventional method is to coat the surfaces of axles and wheel sets with solvent-based high-molecular damping coating, and the principle is to realize the dissipation of vibration energy and delay and reduce the vibration transmission through the friction and absorption among high-molecular chains, between high molecules and inorganic fillers, between fillers and inside the fillers, thereby achieving the effects of vibration reduction and noise reduction.

In recent years, the national environmental pollution treatment strength is increasing, the public environmental awareness is increasing, and the solvent-based coating is gradually replaced by the water-based coating with low ecological environment influence. Although most of solvent-based coatings used for protecting high-speed rail axles in the prior art meet the requirements on performance, pollution to the ecological environment and damage to the health of people are irreversible serious problems.

Disclosure of Invention

Aiming at the defects of the existing products and technologies, the invention aims to provide a water-based stone-impact-resistant silencing coating for a high-speed rail axle, which is used for solving the serious problems and meeting the requirements of rust prevention, corrosion prevention, impact resistance, silencing and noise reduction of the high-speed rail axle.

The invention takes water as solvent, has low VOCs, is green and environment-friendly, can completely replace the traditional solvent-based coating, and is used for coating the surface of the high-speed rail axle; the water-based stone-impact-resistant silencing coating prepared by the invention has the characteristics of wide damping effective temperature range, high solid content, good sagging resistance, good thixotropy and large thickness of one-time film forming; the coating has the advantages of simple preparation process, high coating efficiency, good coating flexibility, obvious stone impact resistance, noise reduction and noise reduction effects, excellent adhesive force, and excellent weather resistance and salt spray resistance.

According to the invention, styrene-acrylate emulsion and acrylate copolymer emulsion with different glass transition temperatures are adopted for compounding, so that the damping performance in a high-temperature area is improved, the effective damping temperature range is widened, and the flexibility and the impact resistance are both considered; the mica powder is added to change the viscoelasticity of the paint film composite material, and absorb vibration energy, and the vibration waves and the sound waves form repeated reflection among the mica wafers to play a role in weakening the energy. In addition, the selected mica powder has the diameter-thickness ratio of 50-60, is basically arranged in parallel in a paint film in an oriented mode, strongly prevents water and other corrosive substances from permeating the paint film, and improves the corrosion resistance; the diatomite is added, so that the characteristics of large porosity, large pore volume, strong absorptivity, stable chemical property, wear resistance, heat resistance and the like are exerted, good noise reduction, sound insulation and noise reduction effects can be achieved, and excellent surface performance is provided for a paint film.

The invention is realized by adopting the following technical scheme:

a water-based stone-impact-resistant silencing coating for high-speed rail axles comprises the following components in parts by mass: 60-66 parts of acrylic acid compound emulsion, 0.1-0.3 part of dispersant, 2.0-3.0 parts of wetting agent, 0.1-0.3 part of defoaming agent, 10-14 parts of functional composite filler, 6-8 parts of pigment and filler, 0.5-2.5 parts of thixotropic agent, 2.0-4.0 parts of film-forming additive, 0.1-0.3 part of pH regulator, 1.0-3.0 parts of thickener and 100 parts of deionized water.

As a preferred scheme, the acrylic acid compound emulsion is prepared by compounding styrene-acrylate emulsion and acrylate copolymer emulsion. Further, the styrene-acrylate emulsion is selected from one or a mixture of two of NeoCrylA-1110 model of Dusman, Netherlands, and the acrylate copolymer emulsion is selected from self-crosslinking water-based acrylic resin R-1199 of New materials of Times and rains, Inc., and NeoCrylA-1120 model of Dusman, Netherlands.

Preferably, the dispersant is one or a mixture of two of ammonium salt solution and sodium salt solution of acrylate copolymer. Further, the dispersing agent is selected from any one or a mixture of more of Zeta Sperse 3100, Tego Dispers 755W and PX4585 of Basff which are Yingchuandi high-aid additives.

Preferably, the wetting agent is a nonionic surfactant; the defoaming agent is polyether siloxane copolymer.

Further, TRITON X-405 manufactured by Dow corporation is selected as the wetting agent; the defoaming agent is Foamex8030 of Digao company or DOWSIL 108F of Dow chemical.

Preferably, the functional composite filler is formed by mixing mica powder and diatomite. Further, the mica powder is 1250-mesh mica powder of Chuzhou Wanqiao sericite Co., Ltd, 1250-mesh mica powder of Chuzhou Ge Rui mining Co., Ltd, and the diatomite is 1250-mesh diatomite of Jilin Yuantong mining Co., Ltd and 1250-mesh diatomite of Yixing Junlian diatomite Co., Ltd.

Preferably, the pigment and filler is any one or a mixture of more of rutile titanium dioxide, carbon black, zinc phosphate and aluminum tripolyphosphate. Further, the rutile type titanium dioxide is selected from any one of BLR-698 model of Bailian group member company of Dragon python, 6316F model of black carbon selected from Anhui Heyu pigment New Material company, zinc phosphate (high purity) selected from zinc phosphate (high purity) for water paint of Xinsheng chemical industry company of Shijiazhuang city, and zinc phosphate of Jinan Lingweichemical company; the aluminum tripolyphosphate is selected from PZ-017 of Hangzhou Sitan pigment chemical industry Co.

Preferably, the thixotropic agent is any one or a mixture of two of inorganic hydrophilic fumed silica and associative polyurethane. Further, the inorganic hydrophilic fumed silica is selected from HL-150 model of Hubei Huffi nanometer materials, Inc., and the associated polyurethane is selected from PAMID D760 model of Guangzhou core new material technology, Inc., or a mixture of two.

As a preferred scheme, the film-forming auxiliary agent is any one or a mixture of more of alcohol esters and alcohol ethers. Further, the alcohol ester film-forming aid is selected from alcohol ester dodecyl in the Dow chemical industry, and the alcohol ether film-forming aid is selected from dipropylene glycol butyl ether in the Dow chemical industry.

Preferably, the pH regulator is an alcamine. Furthermore, the alcohol amine is any one of 2-amino-2-methyl-1-propanol or dimethylamino ethanol as a main component. Further, the ethanolamine-based pH adjuster containing 2-amino-2-methyl-1-propanol as a main component is AMP-95 of the dow chemical, and the ethanolamine-based pH adjuster containing dimethylaminoethanol as a main component is any one of DMAE of hammermite.

The ethanolamine pH regulator is any one of AMP-95 and DMAE of Hommine chemical.

Preferably, the thickener is an associative polyurethane thickener. Further, the associative polyurethane thickener is selected from any one of SN-612 of Santa Nuo Puke (Shanghai) Co., Ltd, and Acrysol RM-2020 Lambda Loms Haas Ha le cis.

The invention provides a preparation method of the water-based stone-impact-resistant silencing paint for the high-speed rail vehicle axle, which comprises the following steps:

weighing the components according to the formula ratio, firstly adding deionized water, a dispersing agent, a defoaming agent of 1/2 and a wetting agent of 2/3 under stirring at the rotating speed of 400r/min for 300-; grinding the pre-dispersed slurry by a sand mill until the fineness is less than 30 mu m to obtain ground slurry; adding the styrene-acrylate emulsion, the acrylate copolymer emulsion, the pH regulator, the defoamer of 1/2, the wetting agent of 1/3, the film-forming aid and the thixotropic agent into the ground slurry under the stirring of 600-800r/min, wherein the adding amount of the pH regulator is that the pH value of the slurry is regulated to 9.0-9.5, stirring for 10-15min after the adding is finished, then regulating the viscosity to 65000-80000mPa & s by using the thickening agent, and stirring for 5-10min after the adding is finished to obtain the finished product of the waterborne stone-impact-resistant sound-deadening coating.

The invention has the beneficial effects that:

1. in the invention, the styrene-acrylate emulsion and the acrylate copolymer emulsion with different glass transition temperatures are selected for acrylic acid compounding, so that the damping performance in a high-temperature area is effectively improved, the effective damping temperature range is widened, and the flexibility and the impact resistance of a paint film are considered.

2. In the invention, the mica powder is added to change the viscoelasticity of the high polymer material of the paint film, thereby playing a role in weakening vibration energy. The diatomite with large porosity and large pore volume is adopted to prevent and reduce the transmission of vibration waves and sound waves, thereby playing good roles of noise reduction, sound insulation and noise reduction.

3. According to the invention, the selected thixotropic agent effectively improves the thixotropy of the water-based paint, improves the leveling property, prevents the occurrence of the spray falling phenomenon of a large-thickness wet film and improves the spray efficiency.

4. In the invention, the mica powder with the diameter-thickness ratio of 50-60 is selected to form basically parallel orientation arrangement in a paint film, so that the penetration of water and other corrosive substances to the paint film is strongly blocked; the corrosion resistance is improved; the composite antirust material is added to passivate the metal surface, so that anodic polarization and cathodic polarization are caused, and the antirust capability of the coating is improved.

5. In the invention, the environment-friendly pigment and filler are introduced into the formula, water is used as a solvent, the VOCs is low, the paint is safe and green, and the paint can completely replace the traditional solvent-based paint and is used for coating the surface of the high-speed rail axle.

6. The invention provides the performance indexes of the products: 65000 viscosity (60 r/min of NDJ rotary viscometer 4# rotor) 80000mPa & s, fineness less than or equal to 30 mu m, solid content more than or equal to 60%, sagging property (wet film thickness) more than or equal to 500 mu m, marking test less than or equal to level 1, anti-flying sand property less than or equal to level 4, salt spray resistance (500 h) paint film has no foaming and no rustiness, paint film adhesion at scratch is not obviously reduced, composite loss factor eta-10 ℃ more than or equal to 0.035, 20 ℃ more than or equal to 0.110, and 50 ℃ more than or equal to 0.035.

Detailed Description

The present invention will be described in further detail with reference to specific examples, which are illustrative of the present invention and are not to be construed as being limited thereto. The amount of the surfactant is limited so as to facilitate the practice of the invention, and is not to be construed as limiting the scope of the invention.

A water-based stone-impact-resistant silencing coating for high-speed rail axles comprises the following components in parts by mass: 60-66 parts of acrylic acid compound emulsion, 0.1-0.3 part of dispersant, 2.0-3.0 parts of wetting agent, 0.1-0.3 part of defoaming agent, 10-14 parts of functional composite filler, 6-8 parts of pigment and filler, 0.5-2.5 parts of thixotropic agent, 2.0-4.0 parts of film-forming additive, 0.1-0.3 part of pH regulator, 1.0-3.0 parts of thickener and 100 parts of deionized water.

In some embodiments, the acrylic acid compound emulsion is prepared by compounding styrene-acrylate emulsion and acrylate copolymer emulsion.

In some preferred embodiments, the styrene-acrylate emulsion is selected from the group consisting of NeoCrylA-1110 from Dissmann, Netherlands, and the acrylate copolymer emulsion is selected from one or a mixture of self-crosslinking waterborne acrylic resin R-1199 from Times and Tiyu advanced materials, Inc., and NeoCrylA-1120 from Dissmann, Netherlands.

In some embodiments, the dispersant is a mixture of either or both of ammonium salt and sodium salt solutions of the acrylate interpolymer.

In some preferred embodiments, the dispersant is selected from Zeta Sperse 3100, Tego Dispers 755W, PX4585 of Basff.

In some embodiments, the wetting agent is a nonionic surfactant; the defoaming agent is polyether siloxane copolymer.

In some preferred embodiments, the wetting agent is TRITON X-405 available from Dow corporation; the defoaming agent is Foamex8030 of Digao company or DOWSIL 108F of Dow chemical.

In some embodiments, the functional composite filler is formed by mixing mica powder and diatomite.

In some preferred embodiments, the mica powder is 1250-mesh mica powder of Wolbridge sericite, Inc. of Chuzhou, 1250-mesh mica powder of Wolk Rui mining, Inc. of Chuzhou, and the diatomaceous earth is 1250-mesh diatomaceous earth of Jilin Yuantong mining, Inc., 1250-mesh diatomaceous earth of Junlian diatomaceous earth, Inc. of Yixing city.

In some embodiments, the pigment and filler is any one or a mixture of rutile titanium dioxide, carbon black, zinc phosphate and aluminum tripolyphosphate.

In some preferred embodiments, the rutile titanium dioxide is selected from any one of the group consisting of BLR-698 from Bailey group, Tokyo, Inc., model 6316F from Hei black Yu pigment New Material, Inc., Zinc phosphate (high purity) from Shijiazhuang Xinsheng chemical industry, Inc., Zinc phosphate from Jinan Lingweihua chemical industry, Inc.; the aluminum tripolyphosphate is selected from PZ-017 of Hangzhou Sitan pigment chemical industry Co.

In some embodiments, the thixotropic agent is any one or a mixture of inorganic hydrophilic fumed silica and associative polyurethane.

In some preferred embodiments, the inorganic hydrophilic fumed silica is selected from any one or a mixture of HL-150 model of Hubei Huffi nanomaterial Co., Ltd, and the associated polyurethane is selected from PAMID D760 model of Guangzhou core New Material science and technology Co., Ltd.

In some embodiments, the film forming aid is any one or a mixture of alcohol esters and alcohol ethers.

In some preferred embodiments, the alcohol ester coalescent is selected from the alcohol ester twelve of the Dow chemistry and the alcohol ether coalescent is selected from the dipropylene glycol butyl ether of the Dow chemistry.

In some embodiments, the pH adjusting agent is an alcanolamine.

In some preferred embodiments, the alkanolamine pH adjusting agent is any one of AMP-95, the Hamming moded DMAE, of the Dow chemistry.

In some embodiments, the thickener is an associative polyurethane thickener.

In some preferred embodiments, the associative polyurethane thickener is selected from any one of SN-612 of Santa Nordisk family (Shanghai) Inc., Acrysol RM-2020, Rohm and Haas Malay.

Example (b):

examples 1-5 a waterborne stone chip resistant and sound damping coating product for high-speed rail car axles was prepared according to the preparation method described by weighing the raw materials in the amounts shown in table 1 below, see table 1.

Table 1: EXAMPLES 1-5 raw material compounding tables

The formula is prepared according to the following preparation method:

the preparation method of the water-based stone-impact-resistant silencing coating for the high-speed rail axle comprises the following steps:

weighing the components according to the formula ratio, firstly adding deionized water, a dispersing agent, a defoaming agent of 1/2 and a wetting agent of 2/3 under stirring at the rotating speed of 400r/min for 300-; grinding the pre-dispersed slurry by a sand mill until the fineness is less than 30 mu m to obtain ground slurry; adding the styrene-acrylate emulsion, the acrylate copolymer emulsion, the pH regulator (the pH value is regulated to 9.0-9.5), the defoaming agent of 1/2, the wetting agent of 1/3, the film-forming assistant and the thixotropic agent into the ground slurry under the stirring of 600-800r/min, stirring for 10-15min after the addition, then regulating the viscosity to 65000-80000mPa & s (NDJ rotational viscometer 4# rotor 60 r/min) by using the thickening agent, and stirring for 5-10min after the addition to obtain a finished product.

And (3) carrying out effect evaluation and performance test on the products obtained in the embodiments 1-5:

a water-based sound-deadening coating for a high-speed railway axle produced in examples 1 to 5 was packed and then stored at room temperature for 30 days. Sampling and spraying to prepare test samples. The tests were carried out according to the items and test standards of Table 2 below, and the results are shown in Table 3.

TABLE 2 test items and test standards for the products

Table 3 examples 1-5 product performance test results

From the test data in Table 3, the viscosity, fineness, nonvolatile content, sag resistance, grid test of paint film, sand flying resistance, salt spray resistance and composite loss factor eta of the waterborne stone-impact-resistant silencing paint for high-speed rail vehicle axles of the invention all meet the design requirements.

The content of Volatile Organic Compounds (VOCs) is lower than 50g/L, which is far lower than the national standard and meets the requirement of environmental protection. The paint film prepared by each embodiment can completely replace solvent-based paint and is used for coating high-speed rail axles.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.