阅读说明：本技术 一种聚脲类防护涂料及其制备方法 (Polyurea protective coating and preparation method thereof ) 是由 赛华征 付蕊 张欣艺 于 2019-05-06 设计创作，主要内容包括：本发明公开了一种聚脲类防护涂料,包括组分A和组分B,组分A与组分B的体积比为0.9~1.2:1,组分A包括聚氧丙烯二胺,二甲硫基甲苯二胺,氨基改性硅油,白炭黑,颜料和消泡剂,组分B包括异氰酸酯预聚物。本发明的聚脲类防护涂料成膜后的抗拉伸强度为18~32 MPa,伸长率为300%~600%,强化了抗冲击能力。(The invention discloses a polyurea protective coating which comprises a component A and a component B, wherein the volume ratio of the component A to the component B is 0.9-1.2: 1, the component A comprises polyoxypropylene diamine, dimethyl-sulfur-based toluene diamine, amino modified silicone oil, white carbon black, pigment and a defoaming agent, and the component B comprises an isocyanate prepolymer. After the polyurea protective coating disclosed by the invention is formed into a film, the tensile strength is 18-32 MPa, the elongation is 300-600%, and the impact resistance is enhanced.)

1. A polyurea protective coating is characterized by comprising a component A and a component B,

the volume ratio of the component A to the component B is 0.9-1.2: 1,

the component A comprises polyoxypropylene diamine, dimethyl-sulfenyl toluene diamine, amino modified silicone oil, white carbon black, pigment and a defoaming agent,

the component B comprises isocyanate prepolymer.

2. The polyurea protective coating according to claim 1, wherein the polyoxypropylene diamine accounts for 60% to 75%, the dimethylthiotoluenediamine accounts for 15% to 25%, the amino-modified silicone oil accounts for 4% to 10%, the white carbon black accounts for 0.5% to 2%, the pigment accounts for 3% to 6%, and the defoamer accounts for 0.5% to 2% by weight.

3. The polyurea-based barrier coating of claim 2, wherein the polyoxypropylene diamine has a molecular weight of 2000.

4. The polyurea protective coating of claim 1, wherein the polyurea protective coating has a tensile strength of 18 to 32MPa and an elongation of 300 to 600% after film formation.

5. A preparation method of polyurea protective paint is characterized by comprising the following steps:

(1) preparation of component A:

adding polyoxypropylene diamine, dimethyl-thio-toluene diamine, amino modified silicone oil, pigment and a defoaming agent into a reaction kettle, stirring for 5-10 min at the rotating speed of 85r/min, adding white carbon black, and stirring for 15-20 min at the rotating speed of 85r/min to obtain a component A;

(2) preparation of component B:

adding micromolecular diisocyanate and polyether polyol into a reaction kettle, and stirring and reacting at 70-90 ℃ at a rotating speed of 85r/min for 3-5 hours to obtain a component B;

(3) and mixing and spraying the prepared component A and the component B on the surface layer of the substrate material by a two-component spray gun according to the volume ratio of 0.9-1.2: 1.

6. The preparation method according to claim 5, wherein the component A is prepared by adding the following materials in parts by mass: 60-75% of polyoxypropylene diamine, 15-25% of dimethyl-sulfenyl toluene diamine, 4-10% of amino modified silicone oil, 0.5-2% of white carbon black, 1-6% of pigment and 0.5-2% of defoaming agent.

7. The method according to claim 6, wherein the molecular weight of the polyoxypropylene diamine is 2000.

8. The preparation method according to claim 5, wherein the small molecule diisocyanate in step (2) is selected from one of 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate or a combination thereof.

9. The method according to claim 5, wherein the polyether polyol in the step (2) has a molecular weight of 2000 to 4000.

10. The preparation method according to claim 5, wherein the B component is prepared by adding the following materials in parts by mass: 48-60% of diisocyanate and 40-52% of polyether polyol.

Technical Field

The invention relates to the field of special coatings, in particular to a polyurea protective coating and a preparation method thereof.

Background

In recent years, with the rapid development of economic society, people pay more and more attention to life safety, but face more and more safety challenges. For example, in the field of transportation, with the rapid increase of the vehicle inventory in China, the number of traffic accidents such as collision, scratch and the like is also significantly increased, and more serious accidents such as fire and even explosion and the like are easily caused when the batteries are damaged by impact due to accidents of new energy automobiles in recent years; in the field of petrochemical industry, explosion and leakage accidents of chemical storage tanks, warehouses and pipelines also happen in recent years, so that not only can life and property loss be caused, but also serious environmental pollution problems are caused.

In addition, the threat of natural disasters to human lives and properties is always present. For example, when an earthquake occurs, huge energy can cause serious damage to buildings such as houses, bridges and tunnels, and even more serious secondary damage is caused like nuclear leakage of the fukushima nuclear power station caused by a major earthquake in 2011, so that serious life and property loss is caused.

Therefore, those skilled in the art are dedicated to develop a high-performance protective coating which is sprayed on the outer surfaces of car bodies, chemical equipment, buildings and the like to strengthen the impact resistance, and the high-performance protective coating has important significance for guaranteeing the safety of lives and properties of people.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to improve the impact resistance of the base material.

In order to achieve the purpose, the invention provides a polyurea protective coating which comprises a component A and a component B, wherein the volume ratio of the component A to the component B is 0.9-1.2: 1, the component A comprises polyoxypropylene diamine, dimethyl-thio-toluene diamine, amino modified silicone oil, white carbon black, pigment and an antifoaming agent, and the component B comprises an isocyanate prepolymer.

Preferably, the weight percentage of the modified amino silicone oil is 60% -75%, the weight percentage of the dimethyl sulfide toluene diamine is 15% -25%, the weight percentage of the amino modified silicone oil is 4% -10%, the weight percentage of the white carbon black is 0.5% -2%, the weight percentage of the pigment is 3% -6%, and the weight percentage of the defoaming agent is 0.5% -2%.

Preferably, the molecular weight of the polyoxypropylene diamine is 2000.

Preferably, the tensile strength of the polyurea protective coating after film forming is 18-32 MPa, and the elongation is 300-600%.

The invention also provides a preparation method of the polyurea protective coating, which comprises the following steps:

(1) preparation of component A:

adding polyoxypropylene diamine, dimethyl-thio-toluene diamine, amino modified silicone oil, pigment and a defoaming agent into a reaction kettle, stirring for 5-10 min at the rotating speed of 85r/min, adding white carbon black, and stirring for 15-20 min at the rotating speed of 85r/min to obtain a component A;

(2) preparation of component B:

adding micromolecular diisocyanate and polyether polyol into a reaction kettle, and stirring and reacting at 70-90 ℃ at a rotating speed of 85r/min for 3-5 hours to obtain a component B;

(3) and mixing and spraying the prepared component A and the component B on the surface layer of the substrate material by a two-component spray gun according to the volume ratio of 0.9-1.2: 1.

Further, the content of the materials added when preparing the component A is as follows according to the mass fraction: 60-75% of polyoxypropylene diamine, 15-25% of dimethyl-sulfenyl toluene diamine, 4-10% of amino modified silicone oil, 0.5-2% of white carbon black, 1-6% of pigment and 0.5-2% of defoaming agent.

Further, the molecular weight of polyoxypropylene diamine is 2000.

Further, the small molecule diisocyanate in step (2) is selected from one or a combination of 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, diphenylmethane diisocyanate and dicyclohexylmethane diisocyanate.

Further, the molecular weight of the polyether polyol in the step (2) is 2000-4000.

Further, the content of the materials added when preparing the component B is as follows according to the mass fraction: 48-60% of diisocyanate and 40-52% of polyether polyol.

Technical effects

Compared with the prior art, the white carbon black is introduced, so that the strength of the coating after film forming can be further enhanced, the porous structure of the coating is favorable for absorbing external impact energy, the protective effect is better achieved, and the adding sequence of the white carbon black plays a role in improving the impact resistance of the base material;

after the polyurea protective coating disclosed by the invention is formed into a film, the tensile strength and the elongation are obviously increased, and the impact resistance is enhanced.

The conception and the resulting technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features and effects of the present invention.

Drawings

FIG. 1 is a flow chart of a process for preparing the polyurea barrier coating of the present invention.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

The polyurea protective coating disclosed by the invention consists of a component A and a component B, and the tensile strength of the coating after film forming is 18-32 MPa, and the elongation is 300-600%.

The component A comprises the following components in percentage by mass: 60-75% of polyoxypropylene diamine with molecular weight of 2000, 15-25% of dimethyl-sulfenyl toluene diamine, 4-10% of amino modified silicone oil, 0.5-2% of white carbon black, 1-6% of pigment and 0.5-2% of defoaming agent;

the component B is isocyanate prepolymer.

As shown in fig. 1, the preparation method of the polyurea protective coating of the invention comprises the following steps:

(1) preparation of component A:

according to the mass fraction, 60-75% of polyoxypropylene diamine with the molecular weight of 2000, 15-25% of dimethyl-sulfur-based toluene diamine, 4-10% of amino modified silicone oil, 1-6% of pigment and 0.5-2% of defoaming agent are added into a reaction kettle and stirred for 5-10 minutes at the rotating speed of 85r/min, then 0.5-2% of white carbon black is added, and stirred for 15-20 minutes at the rotating speed of 85r/min, so that the component A is obtained.

(2) Preparation of component B:

adding 48-60% of micromolecule diisocyanate and 40-52% of polyether polyol into a reaction kettle according to mass fraction, and stirring and reacting at 70-90 ℃ at a rotating speed of 85r/min for 3-5 hours to obtain a component B;

(3) the prepared component A and the component B are mixed and sprayed on the surface layer of the base material by a two-component spray gun according to the volume ratio of 0.9-1.2: 1 to form a film and solidify, so that the effect of improving the shock resistance of the base material can be achieved.

Examples of the process of the present invention are described below, and the chemical materials used in the examples are commercially available.