CN1151221C - Anti-corrosion and waterproof coating material and preparation method thereof - Google Patents

Abstract

The present invention provides an anticorrosion waterproof elastic coating material and a preparation method thereof. The material comprises the following components by weight: 10 to 30 wt% of hydrophobic polymer with polar groups, 5 to 20 wt% of elastic polymer, 20 to 30 wt% of pigment and filling material, 5 to 20 wt% of solvent, 10 to 30 wt% of propelling agent and 0.1 to 0.5 wt% of crosslinking agent. The preparation method comprises the following steps: firstly, the hydrophobic polymer with polar groups and the elastic polymer are dissolved in the solvent; one third of the obtained product is mixed with the pigment and the filling material to be sheared and stirred at a high speed for 10 to 20 minutes; two thirds of the obtained product is mixed with a mixed liquid of the pigment and the filling material to be stirred at a low speed for 20 to 40 minutes; the crosslinking agent is put into the mixture to be stirred at a medium speed for 20 to 30 minutes; the product is obtained by adding the propelling agent and encapsulating at last. The present invention has the advantages of simple process, easy control, adjustable performance of material, corrosion resistance, water resistance, elasticity, good damping shock absorption performance and good noise reduction performance. The present invention can be widely used for motor vehicle chassis, carriage inner ground surfaces and building industries on the occasions of corrosion resistance, water resistance, protection, shock absorption, noise reduction, leak stoppage, etc.

Description

Anti-corrosion and waterproof coating material and preparation method thereof

technical field

The invention relates to an anti-corrosion and waterproof coating material and its preparation, especially an anti-corrosion and waterproof elastic coating material suitable for use in anti-corrosion and waterproofing, protection, shock absorption, noise reduction, leak plugging, etc. Preparation.

technical background

U.S. Patent No. 6,203,930 discloses an anti-corrosion coating material based on metal powder and synthetic resin. The preparation process is to dissolve inorganic fillers, pigments, and resins in a mixture of water and hydrophilic solvents, and then coat the mixture. Or spray it on the surface of the pre-treated metal substrate, and then cure it by air-drying at room temperature or heating-drying. When the anticorrosion coating prepared by this method is applied on the surface of the metal substrate, the metal substrate must be pretreated, that is, the surface of the metal substrate is plated with zinc or coated with a layer of zinc powder paint, so that the anticorrosion coating The construction operation of the layer material is more complicated when it is applied, and its application range is limited. In addition, this method uses a mixture of water and a hydrophilic solvent as a solvent for the resin, so a resin with a certain degree of hydrophilicity must be used; therefore, the final cured anti-corrosion coating has slightly poor water resistance.

U.S. Patent No. 6,291,054 discloses a method for making an anti-corrosion coating material. The anti-corrosion coating includes three layers, namely a bottom layer, a middle coating and a surface layer; A mixture of fillers, pigments and liquid thermosetting resins; the middle coating and the surface layer are heated and cured at a temperature of 100-160°C; therefore, the anti-corrosion coating prepared by this method has a complicated preparation process and is not convenient for construction and application.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art, and provide an excellent and stable anti-corrosion and waterproof elastic coating material and a convenient and practical preparation method thereof.

The purpose of the present invention can be achieved through the following measures:

The composition weight percentage of anticorrosion waterproof elastic coating material is as follows:

Components % by weight

Hydrophobic polymer with polar groups 10～30%

Elastic polymer 5～20%

Pigments and fillers 20～30%

Solvent 5～20%

Cross-linking agent 0.1～0.5%

Propellant 10～30%

Hydrophobic polymers with polar groups are selected from polymers containing functional groups such as hydroxyl and/or carboxyl or ester groups and/or amino and/or aldehyde groups or halogen or cyano groups, with molecular weights between 10,000 and 100,000; Hydrophobic polymers with polar groups are preferably selected from polymers containing hydroxyl and/or amino and/or carboxyl groups;

The elastomeric polymer is selected from elastomeric polymers having unsaturated double bonds and a molecular weight greater than 50,000;

Pigments are selected from various inorganic or organic pigments such as white, red, blue, green, black, purple, etc.;

The filler is selected from inorganic fillers, including silica and/or carbon black and/or titanium dioxide and/or talcum powder and/or lithopone and/or mica powder and/or calcium carbonate and/or zinc powder and/or phosphoric acid aluminum;

The solvent is selected from a polar solvent, a non-polar solvent, or a combination of polar and non-polar solvents;

The propellant is selected from gases such as propane and butane and/or methyl ether and/or methyl ethyl ether and/or dichloromethane;

The crosslinking agent is selected from metal salt crosslinking agents of naphthenic acid and isooctanoic acid.

The preparation method of anticorrosion waterproof elastic coating material is characterized in that it comprises the following steps:

Step 1 Preparation:

According to the required color, adjust the weight percentage of each component within the weight percentage range of the following components, and prepare the materials according to the adjusted formula: 10-30% of hydrophobic polymer with polar groups, elastic polymer 5-20%, pigment and filler 20-30%, solvent 5-20%, propellant 10-30% and cross-linking agent 0.1-0.5%;

Step 2 Preparation of anti-corrosion and waterproof elastic coating material:

Dissolve the hydrophobic polymer and elastic polymer with polar groups in the step 1 component in the solvent; mix one-third of the above solution with pigments and fillers, and use it at a high speed at a speed of 500 to 1000 rpm Shear and stir for 10 to 20 minutes; then, mix the remaining two-thirds of the above solution with the mixture of pigment and filler, and stir at a low speed of 50 to 100 rpm for 20 to 40 minutes; put the crosslinking agent Pour into the above mixture, and stir at a medium speed for 20 to 30 minutes at a speed of 100 to 500 rpm;

Step 3 Canning of anti-corrosion and waterproof elastic coating materials:

Add a propellant to the anti-corrosion and waterproof elastic coating material prepared in step 2, and seal it with an aerosol can packaging machine to obtain an anti-corrosion and waterproof elastic coating material.

Compared with the prior art, the present invention has the following outstanding advantages:

1. Use hydrophobic polymers with polar groups to ensure that the material has excellent adhesion, anti-corrosion, and waterproof properties; use elastic polymers to ensure that the resulting coating has excellent shock absorption and noise reduction properties; the material in the application process , the metal substrate does not need to be pretreated, so the construction and application are convenient and the process is simple.

2. The anti-corrosion and waterproof coating material produced by this method has stable and excellent performance. It can be used for anti-corrosion and waterproofing, protection, shock absorption, noise reduction, leak plugging and other occasions in the chassis of motor vehicles, the ground in the compartment, and the construction industry.

3. The anti-corrosion and waterproof elastic coating material manufactured by this method adopts metal salts of oil-soluble naphthenic acid and isooctanoic acid as a crosslinking agent, which ensures that the coating can be cured at room temperature without high-temperature heating and curing, thereby making the process Simple and easy to apply.

4. The anti-corrosion and waterproof elastic coating material manufactured by this method is sprayed on the metal substrate to form an anti-corrosion and waterproof elastic coating. Determination method of stress", GB/T1733-93 "Determination of water resistance of paint film", GB10834-89 "Determination of salt water resistance of paint film" and GB/T1732-93 "Determination of impact resistance of paint film". The product test result of embodiment 1-6 gained is as shown in table 1:

The performance of the product obtained in the embodiment of table 1 Adhesion waterproof performance Anti-corrosion properties elasticity Example 1 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent Example 2 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent Example 3 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent Example 4 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent Example 5 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent Example 6 Level 0 (excellent) No discoloration, no shedding No discoloration, no shedding excellent

Detailed ways

The formula of embodiment 1-6 is as shown in table 2. The raw materials in Table 2 are commercially available chemical industry products.

Preparation steps of anti-corrosion and waterproof elastic coating material:

The hydrophobic polymer with polar groups in the components of each embodiment of Table 2, the elastic polymer are dissolved in the solvent of each embodiment of Table 2; 1/3 of the above-mentioned solution is mixed with pigment and filler, Put it into the JB90-D (Shanghai Specimen Model Factory) mixer, and adjust it to 500-1000 rpm according to Table 2 under high-speed shear stirring for 10-20 minutes; then, mix the remaining two-thirds of the above Mix the solution with the mixture of pigment and filler, adjust the agitator to 50-100 rpm and stir at a low speed for 20-40 minutes; put the cross-linking agent into the above mixture, adjust the agitator to 100-500 rpm Stir at a medium speed at a rotating speed for 20 to 30 minutes;

Add the propellant shown in the table to the prepared anti-corrosion and waterproof elastic coating material, and seal it with an aerosol can packaging machine to obtain the anti-corrosion and waterproof elastic coating material.

Table 2

Claims (3)

1. Anti-corrosion and waterproof elastic coating material, characterized in that the weight percentage of components is as follows: Components % by weight Hydrophobic polymer with polar groups 10～30% Elastic polymer 5～20% Pigments and fillers 20～30% Solvent 5～20% Cross-linking agent 0.1～0.5% Propellant 10～30% Hydrophobic polymers with polar groups are selected from polymers containing hydroxyl and/or carboxyl or ester groups and/or amino and/or aldehyde or halogen or cyano functional groups, with molecular weights between 10,000 and 100,000; The elastomeric polymer is selected from elastomeric polymers having unsaturated double bonds and a molecular weight greater than 50,000; The pigment is selected from various inorganic or organic pigments from white, red, blue, green, black, purple; The filler is selected from inorganic fillers, including white carbon black and/or carbon black and/or talcum powder and/or lithopone and/or mica powder and/or calcium carbonate and/or zinc powder and/or aluminum phosphate; The solvent is selected from a polar solvent, a non-polar solvent, or a combination of polar and non-polar solvents; The propellant is selected from propane and butane and/or methyl ether and/or methyl ethyl ether and/or dichloromethane gas; The crosslinking agent is selected from metal salt crosslinking agents of naphthenic acid and isooctanoic acid. 2. The anti-corrosion and waterproof elastic coating material according to claim 1, characterized in that the hydrophobic polymer with polar groups is selected from polymers containing hydroxyl and/or amino and/or carboxyl groups. 3. A process for preparing the product of claim 1, characterized in that it comprises the steps of: Step 1 Preparation: According to the required color, adjust the weight percentage of each component within the weight percentage range of the following components, and prepare the materials according to the adjusted formula: 10-30% of hydrophobic polymer with polar groups, elastic polymer 5-20%, pigment and filler 20-30%, solvent 5-20%, propellant 10-30% and cross-linking agent 0.1-0.5%; Step 2 Preparation of anti-corrosion and waterproof elastic coating material: First, dissolve the hydrophobic polymer and elastic polymer with polar groups in the first component in the solvent; then mix one-third of the above solution with pigments and fillers at a speed of 500 to 1000 rpm Stir under high-speed shear for 10-20 minutes; then mix two-thirds of the above solution with the mixture of pigment and filler, and stir at a low speed of 50-100 rpm for 20-40 minutes; put the crosslinking agent in In the above mixture, stir at a medium speed for 20 to 30 minutes at a speed of 100 to 500 rpm; Step 3 Canning of anti-corrosion and waterproof elastic coating materials: Add a propellant to the anti-corrosion and waterproof elastic coating material prepared in step 2, and seal it with an aerosol can packaging machine to obtain an anti-corrosion and waterproof elastic coating material.