Preparation method of anti-corrosion wear-resistant polyurea coating

Abstract

The invention relates to the technical field of polyurea coatings, in particular to a preparation method of an anti-corrosion and wear-resistant polyurea coating, the anti-corrosion and wear-resistant polyurea coating is generated by reaction of a two-component synthetic material, the two components can be a component A and a component B, the component A is a clear and transparent liquid, and the component B is a colored liquid. Through the raw materials such as the polyisocyanate, the diluent, the curing agent and the reactive inert auxiliary agent which are proportioned in the invention, the addition parts by weight of the polyisocyanate, the curing agent and the reactive inert auxiliary agent can be respectively increased or decreased from three directions of humidity, the addition parts by weight of the curing agent and the increase of the reactive inert auxiliary agent in the whole preparation process; the curing speed and the curing time of the whole anti-corrosion wear-resistant polyurea coating are proportionally adjusted by adjusting the curing speed and the curing time of the anti-corrosion wear-resistant polyurea coating, so that the anti-corrosion wear-resistant polyurea coating can adapt to actual construction requirements, the coating with proper curing time is used for spraying a construction layer, and the complexity and the difficulty of construction operation are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of polyurea coatings, in particular to a method for preparing an anticorrosive and wear-resistant polyurea coating. Background Art

[0002] Anticorrosion and wear-resistant polyurea coating is a new type of coating. It is an elastomeric anticorrosion coating mainly generated by the reaction of isocyanate components and amino compound components. In addition, anticorrosion and wear-resistant polyurea coating also has excellent chemical corrosion resistance, water resistance, weather resistance, wear resistance, impact resistance and other characteristics, so that it can be directly sprayed on the metal surface to achieve one-coat multi-layer construction. In addition, anticorrosion and wear-resistant polyurea coating is not paint. The two are essentially different in composition and performance. Anticorrosion and wear-resistant polyurea coating does not add any water-based or oily solvents. It relies entirely on the full mixing of AB two components to form an integrated seamless polyurea coating. It has environmentally friendly and safe characteristics, with a solid content of more than 98%, and does not contain harmful substances such as formaldehyde.

[0003] When using special spraying equipment to spray the anti-corrosion and wear-resistant polyurea coating onto the surface to be constructed, considering that the anti-corrosion and wear-resistant polyurea coating will be quickly cured in a short time when the temperature is high in summer (such as 20-35°C), the short curing time at this time will test the proficiency and operation speed of the operator, and will also increase some additional construction costs for some operators who have not used anti-corrosion and wear-resistant polyurea coatings, increase the complexity and difficulty of the spraying construction process, and the construction quality after the subsequent coating is formed will also be affected by certain technical factors. Therefore, the demand for a preparation method of an anti-corrosion and wear-resistant polyurea coating is growing. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing an anti-corrosion and wear-resistant polyurea coating to solve the problem in the above background technology that the conventional use of anti-corrosion and wear-resistant polyurea coating for construction work will increase the construction cost due to the fast curing speed.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An anti-corrosion and wear-resistant polyurea coating, wherein the anti-corrosion and wear-resistant polyurea coating is produced by the reaction of two-component synthetic materials, wherein the two components may be component A and component B, wherein component A is a clear and transparent liquid, and component B is a colored liquid, and the volume ratio of component A to component B is 1:1;

[0007] The raw materials of component A include: 30 to 50 parts by weight of polyisocyanate, 20 to 50 parts by weight of polyether polyol, 1 to 30 parts by weight of epoxy resin and 1 to 5 parts by weight of diluent;

[0008] The raw materials of component B include: 40-70 parts by weight of amino-terminated polyether, 25-40 parts by weight of amino-terminated chain extender, 3-9 parts by weight of colorant and 0.05-0.2 parts by weight of auxiliary agent;

[0009] The auxiliary ingredients include: 30-60 parts by weight of organic-inorganic composite wear-resistant particles, 6-15 parts by weight of a curing agent and 2-8 parts by weight of a reaction inert auxiliary agent.

[0010] Preferably, the diluent in group A can be propylene carbonate and / or ethylene carbonate, and the polyisocyanate in group A can be TDI50 (toluene diisocyanate 50%).

[0011] Preferably, the component A can be obtained by reacting 30 to 50 parts by weight of polyisocyanate, 20 to 50 parts by weight of polyether polyol and 20 to 30 parts by weight of epoxy resin to obtain 90 wt% to 100 wt% of isocyanate semi-prepolymer, and the mass percentage of isocyanate functional groups in the isocyanate semi-prepolymer is 18% to 23%.

[0012] Preferably, the amino-terminated polyether in the B component can be preferably polyoxypropylene diamine and / or polyoxypropylene triamine, and the amino-terminated chain extender in the B component is specifically a hindered aromatic diamine chain extender.

[0013] Preferably, the additives in the B component include additives such as anti-aging additives, adhesion promoters, defoaming agents and leveling agents.

[0014] Preferably, the curing agent in the auxiliary ingredients can be selected from polyurea coating chain extender DMTDA or MOCA polyurethane curing agent, and the reaction inert auxiliary agent in the auxiliary ingredients can be selected from polyethylene glycol.

[0015] A method for preparing an anticorrosive and wear-resistant polyurea coating, characterized in that the coating preparation method comprises the following steps:

[0016] Step 1:

[0017] In a light-proof and appropriately bright environment, use a weight-balancing device to accurately proportion polyisocyanate, polyether polyol, epoxy resin, diluent, amino-terminated polyether, amino-terminated chain extender, colorant, additive, organic-inorganic composite wear-resistant particles, curing agent and reaction-inert additive in sequence according to the formula ratio;

[0018] Step 2:

[0019] When component A needs to be prepared, polyisocyanate, polyether polyol and epoxy resin are added into the reactor in order according to weight fraction at an operating temperature of 90-110° C., and nitrogen is introduced for vacuum dehydration treatment. The reaction is carried out for 3-7 hours, and the temperature is cooled to below 40-50° C. for 1 hour, and a diluent is added by stirring. Component A can be obtained after polymerization reaction.

[0020] Step 3:

[0021] When it is necessary to prepare and produce component B, the amino-terminated polyether is first added into the reaction kettle according to the weight fraction at an operating temperature of 110-120°C, and the auxiliary agent is slowly added for auxiliary stirring, and then the amino-terminated chain extender and the colorant are added and stirred at high speed for 0.5-1 hour, and then the remaining auxiliary agent is added for mixing, and the component B can be obtained after filtering through a sieve;

[0022] Step 4:

[0023] The prepared component A and component B are mixed in a processing reactor at an equal volume ratio of 1:1, and organic-inorganic composite wear-resistant particles and a curing agent are added according to the weight fraction.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the present invention, through the proportioning raw materials such as polyisocyanate, diluent, curing agent and reaction inert auxiliary agent provided in the invention, the entire preparation process can increase or decrease the added weight of polyisocyanate, curing agent and reaction inert auxiliary agent respectively from three directions of humidity, added weight of curing agent and added reaction inert auxiliary agent, so as to adjust the curing speed and curing time of the entire anti-corrosion and wear-resistant polyurea coating in a proportioning manner, so as to adapt to actual construction needs and use a coating with a suitable curing time for construction layer spraying operation. In addition, the reasonable proportioning and use of the anti-corrosion and wear-resistant polyurea coating in the present invention can reduce the proficiency requirements of operators using the anti-corrosion and wear-resistant polyurea coating to carry out spraying construction operations, and can also reduce the economic cost required for actual spraying construction, reduce the complexity and difficulty of construction operations, ensure the construction quality of the coating after spraying, and solve the technical problem proposed in the above background technology that the conventional use of anti-corrosion and wear-resistant polyurea coating for construction operations will increase the construction cost due to the fast curing speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a comparison chart of experimental data of the coating preparation of the present invention. DETAILED DESCRIPTION

[0027] Embodiment 1:

[0028] See also Figure 1 , the present invention provides a technical solution:

[0029] An anti-corrosion and wear-resistant polyurea coating is produced by the reaction of two-component synthetic materials, wherein the two components may be component A and component B, component A is a clear and transparent liquid, component B is a colored liquid, and the volume ratio of component A to component B is 1:1;

[0030] The raw materials of component A include: 30 to 50 parts by weight of polyisocyanate, 20 to 50 parts by weight of polyether polyol, 1 to 30 parts by weight of epoxy resin and 1 to 5 parts by weight of diluent;

[0031] The raw materials of component B include: 40-70 parts by weight of amino-terminated polyether, 25-40 parts by weight of amino-terminated chain extender, 3-9 parts by weight of colorant and 0.05-0.2 parts by weight of auxiliary agent;

[0032] The auxiliary ingredients include: 30-60 parts by weight of organic-inorganic composite wear-resistant particles, 6-15 parts by weight of a curing agent and 2-8 parts by weight of a reaction inert auxiliary agent.

[0033] The diluent in group A can preferably be propylene carbonate and / or ethylene carbonate, and the polyisocyanate in group A can be TDI50 (50% toluene diisocyanate). By adding appropriate diluents, the irritation generated by the reaction between the isocyanate group and the liquid amine can be weakened, thereby improving the safety of the operation.

[0034] Component A can be obtained by reacting 30-50 parts by weight of polyisocyanate, 20-50 parts by weight of polyether polyol and 20-30 parts by weight of epoxy resin to obtain 90wt%-100wt% isocyanate semi-prepolymer, and the mass percentage of isocyanate functional groups in the isocyanate semi-prepolymer is 18%-23%.

[0035] The amino-terminated polyether in component B can preferably be polyoxypropylene diamine and / or polyoxypropylene triamine, and the amino-terminated chain extender in component B is specifically a hindered aromatic diamine chain extender.

[0036] The additives in component B include anti-aging additives, adhesion promoters, defoaming agents, leveling agents and other additives. The function of these additives is to improve the durability, adhesion and construction performance of the coating.

[0037] The curing agent in the auxiliary ingredients can be selected from polyurea coating chain extender DMTDA or MOCA polyurethane curing agent, and the reaction inert auxiliary agent in the auxiliary ingredients can be selected from polyethylene glycol.

[0038] A method for preparing an anticorrosive and wear-resistant polyurea coating, characterized in that the coating preparation method comprises the following steps:

[0039] Step 1:

[0040] In a light-proof and appropriately bright environment, use a weight-balancing device to accurately proportion polyisocyanate, polyether polyol, epoxy resin, diluent, amino-terminated polyether, amino-terminated chain extender, colorant, additive, organic-inorganic composite wear-resistant particles, curing agent and reaction-inert additive in sequence according to the formula ratio;

[0041] Step 2:

[0042] When component A needs to be prepared, 30 parts of polyisocyanate, 20 parts of polyether polyol and 20 parts of epoxy resin are sequentially added into the reactor at an operating temperature of 90-110°C, and nitrogen is introduced for vacuum dehydration treatment. The reaction is carried out for 3-7 hours, and the temperature is cooled to below 40-50°C for 1 hour, and 0.09 parts of diluent are added by stirring. Component A can be obtained after polymerization reaction;

[0043] Step 3:

[0044] When it is necessary to prepare and produce component B, 40 parts of amino-terminated polyether are first added into the reaction kettle at an operating temperature of 110-120° C. according to the weight fraction, and 0.05 parts of auxiliary agent are slowly added for auxiliary stirring, then 25 parts of amino chain extender and colorant are added for high-speed stirring and mixing for 0.5-1 hour, and the remaining 0.05 parts of auxiliary agent are added for mixing, and the component B can be obtained after filtering through a sieve;

[0045] Step 4:

[0046] The prepared components A and B were mixed in a processing reactor at an equal volume ratio of 1:1, and 30 parts of organic-inorganic composite wear-resistant particles and 6 parts of curing agent (0 parts of reaction inert additives) were added according to weight fractions.

[0047] After stirring and mixing and quantitative sampling, it was found that the curing time of the anti-corrosion and wear-resistant polyurea coating was 18-45 minutes, the water content was <7%, and the adhesion was 14.2MPa.

[0048] Embodiment 2:

[0049] See also Figure 1 , the present invention provides a technical solution:

[0050] When component A needs to be prepared, 40 parts of polyisocyanate, 20 parts of polyether polyol and 30 parts of epoxy resin are sequentially added into the reactor at an operating temperature of 90-110°C, and nitrogen is introduced for vacuum dehydration treatment. The reaction is carried out for 3-7 hours, and the temperature is cooled to below 40-50°C for 1 hour, and 0.09 parts of diluent are added by stirring. Component A can be obtained after polymerization reaction;

[0051] Step 3:

[0052] When it is necessary to prepare and produce component B, 40 parts of amino-terminated polyether are first added into the reaction kettle at an operating temperature of 110-120° C. according to the weight fraction, and 0.05 parts of auxiliary agent are slowly added for auxiliary stirring, then 25 parts of amino chain extender and colorant are added for high-speed stirring and mixing for 0.5-1 hour, and the remaining 0.05 parts of auxiliary agent are added for mixing, and the component B can be obtained after filtering through a sieve;

[0053] Step 4:

[0054] The prepared component A and component B were mixed in an equal volume processing reactor at a ratio of 1:1.05, and 30 parts of organic-inorganic composite wear-resistant particles, 5 parts of curing agent and 2 parts of reaction inert additives were added according to weight fractions.

[0055] After stirring and mixing and quantitative sampling, it was found that the curing time of the anti-corrosion and wear-resistant polyurea coating was 24-60 minutes, the water content was <8%, and the adhesion was 13.8 MPa.

[0056] It can be concluded from the above-mentioned test data that when the anti-corrosion and wear-resistant polyurea coating in the present invention needs to regulate its own curing speed, from the perspective of humidity, the entire preparation process increases the weight of polyisocyanate to enable it to chemically react with moisture in the air, increase the moisture content of the coating, and reduce its curing speed after spraying. From the perspective of the added weight of the curing agent, the entire preparation can delay the drying and curing speed of the coating by reducing the added weight of the curing agent. From the perspective of increasing the reaction inert auxiliary agent, the entire preparation process adds the curing agent in the process of mixing component A and component B, and also adds an appropriate amount of reaction inert auxiliary agent to reduce the activity of the curing agent, thereby further shortening the time required for coating curing.

[0057] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. An anticorrosive and wear-resistant polyurea coating, characterized in that: The anticorrosive and wear-resistant polyurea coating is produced by the reaction of two-component synthetic materials, wherein the two components may be component A and component B, the component A is a clear and transparent liquid, the component B is a colored liquid, and the volume ratio of the component A to the component B is 1:1; The raw materials of component A include: 30 to 50 parts by weight of polyisocyanate, 20 to 50 parts by weight of polyether polyol, 1 to 30 parts by weight of epoxy resin and 1 to 5 parts by weight of diluent; The raw materials of component B include: 40-70 parts by weight of amino-terminated polyether, 25-40 parts by weight of amino-terminated chain extender, 3-9 parts by weight of colorant and 0.05-0.2 parts by weight of auxiliary agent; The auxiliary ingredients include: 30-60 parts by weight of organic-inorganic composite wear-resistant particles, 6-15 parts by weight of a curing agent and 2-8 parts by weight of a reaction inert auxiliary agent.

2. The anticorrosion and wear-resistant polyurea coating according to claim 1, characterized in that: The diluent in group A can be preferably propylene carbonate and / or ethylene carbonate, and the polyisocyanate in group A can be TDI50 (toluene diisocyanate 50%).

3. The anticorrosion and wear-resistant polyurea coating according to claim 1, characterized in that: The component A can be obtained by reacting 30 to 50 parts by weight of polyisocyanate, 20 to 50 parts by weight of polyether polyol and 20 to 30 parts by weight of epoxy resin to obtain 90 wt% to 100 wt% of isocyanate semi-prepolymer, and the mass percentage of isocyanate functional groups in the isocyanate semi-prepolymer is 18% to 23%.

4. The anticorrosion and wear-resistant polyurea coating according to claim 1, characterized in that: The amino-terminated polyether in the B component can preferably be polyoxypropylene diamine and / or polyoxypropylene triamine, and the amino-terminated chain extender in the B component is specifically a hindered aromatic diamine chain extender.

5. The anticorrosion and wear-resistant polyurea coating according to claim 1, characterized in that: The additives in the B component include anti-aging additives, adhesion promoters, defoamers, leveling agents and other additives.

6. The anticorrosion and wear-resistant polyurea coating according to claim 1, characterized in that: The curing agent in the auxiliary ingredients can be selected from polyurea coating chain extender DMTDA or MOCA polyurethane curing agent, and the reaction inert auxiliary agent in the auxiliary ingredients can be selected from polyethylene glycol.

7. The method for preparing an anticorrosive and wear-resistant polyurea coating according to claim 1, characterized in that: The preparation method of the coating comprises the following steps: Step 1: In a light-proof and appropriately bright environment, use a weight-balancing device to accurately proportion the raw materials such as polyisocyanate, polyether polyol, epoxy resin, diluent, amino-terminated polyether, amino chain extender, colorant, additive, organic-inorganic composite wear-resistant particles, curing agent and reaction inert additive in sequence according to the formula ratio; Step 2: When component A needs to be prepared, polyisocyanate, polyether polyol and epoxy resin are added into the reactor in order according to weight fraction at an operating temperature of 90-110° C., and nitrogen is introduced for vacuum dehydration treatment. The reaction is carried out for 3-7 hours, and the temperature is cooled to below 40-50° C. for 1 hour, and a diluent is added by stirring. After mixing and reacting, component A can be obtained; Step 3: When it is necessary to prepare and produce component B, the amino-terminated polyether is first added into the reaction kettle according to the weight fraction at an operating temperature of 110-120°C, and the auxiliary agent is slowly added for auxiliary stirring, and then the amino-terminated chain extender and the colorant are added and stirred at high speed for 0.5-1 hour, and then the remaining auxiliary agent is added for mixing, and the component B can be obtained after filtering through a sieve; Step 4: The prepared component A and component B are mixed in a processing reactor at an equal volume ratio of 1:1, and organic-inorganic composite wear-resistant particles and a curing agent are added according to the weight fraction.

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