CN118480302A - General antirust primer for household appliance building materials and preparation method thereof - Google Patents

Abstract

The present application relates to the field of paint technology, and specifically discloses a universal anti-rust primer for household appliances and building materials and a preparation method thereof. A universal anti-rust primer for household appliances and building materials, comprising a special polyester resin, a saturated polyester resin, an epoxy phosphate, nano barium sulfate, an anti-rust pigment, a whitening pigment, a curing agent, a solvent and other additives; the preparation method thereof is: firstly stir and mix the special polyester resin, epoxy phosphoric acid and a solvent, then add nano barium sulfate, an anti-rust pigment and a whitening pigment, stir and mix, and grind to obtain a mixture; add the curing agent, the saturated polyester resin and other additives to the mixture and stir and mix to obtain a universal anti-rust primer for household appliances and building materials. The universal anti-rust primer for household appliances and building materials of the present application is applicable to the fields of construction steel coating, household appliance coating and other coil coating, and has excellent adhesion and anti-rust ability.

Description

General antirust primer for household appliance building materials and preparation method thereof

Technical Field

The application relates to the technical field of paint, in particular to a universal antirust primer for household appliance building materials and a preparation method thereof.

Background

The rust-proof primer is used as a primer for base layer treatment and mainly plays a role in rust prevention. In the coating of building steel, the antirust primer comprises a traditional strontium chrome yellow primer and a white primer without complexation.

Although, the conventional strontium chrome yellow primer has more excellent rust inhibitive performance than the white primer without complexation. However, the heavy metal chromium content in the traditional strontium chrome yellow primer is seriously out of standard, and in the use process, the primer is atomized and flows into the soil of the surface layer, so that the environment is seriously polluted.

Disclosure of Invention

The application provides a general antirust primer for household appliance building materials and a preparation method thereof, in order to improve the environmental protection performance of the primer.

In a first aspect, the application provides a general antirust primer for household appliance building materials, which adopts the following technical scheme:

The universal antirust primer for the household appliance building materials is prepared from the following raw materials in percentage by weight:

10-30% of special polyester resin;

20-40% of saturated polyester resin;

2-4% of epoxy phosphate;

4-10% of nano barium sulfate;

3-11% of rust-proof pigment;

4-8% of whitening pigment;

5-9% of curing agent;

3-8% of a solvent;

4.9-10% of other auxiliary agents;

the acid value of the epoxy phosphate is 20-50mg KOH/g, and the solid content is 73-77%;

The barium sulfate content of the nano barium sulfate is more than or equal to 98%, the pH value is 6.5-8.0, and the oil absorption is 15-20g/100g.

The epoxy phosphate is an adhesion promoter, and can react with a large number of active groups on the surface of the substrate to form chemical bonds, so that the adhesion between a paint film and the substrate is enhanced. By adopting the technical scheme, the epoxy phosphate with the special physical properties and the nano barium sulfate are adopted as the surface treatment agent, and the nano barium sulfate has high activation degree and good compatibility with raw materials such as epoxy phosphate, rust-proof pigment and the like. Therefore, the nanometer barium sulfate, the epoxy phosphate, the antirust pigment and other raw materials can be tightly combined, and when the epoxy phosphate reacts with a large number of active groups on the surface of the substrate to form chemical bonds, the chemical bonds are tightly adhered to the surface of the substrate, so that the adhesion capability of a paint film on the surface of the substrate and the compactness of the paint film are improved, and the antirust capability of the paint film is improved.

The primer provided by the application has good adhesive force and rust resistance, and can meet the use requirements of outdoor environments of building materials. Meanwhile, the primer does not contain heavy metal chromium, so that serious environmental pollution is avoided in the use process, and the environmental protection performance of the primer is improved.

Preferably, the molecular weight of the special polyester resin is 6500-20000, the hydroxyl value is 23-25mg KOH/g, and the glass transition temperature is 28-50 ℃.

Preferably, the molecular weight of the special polyester resin is 6500, the hydroxyl value is 20-30mg KOH/g, and the glass transition temperature is 28 ℃.

By adopting the technical scheme, the special polyester resin with the molecular weight and the hydroxyl value has good processability, has good compatibility with raw materials such as nano barium sulfate, epoxy phosphate, rust-proof pigment and the like, can promote the raw materials to form a compact paint film on the surface of a substrate, and is beneficial to further improving the adhesive force and the rust-proof capability of the paint film.

Preferably, the saturated polyester resin has a molecular weight of 16000 and a hydroxyl number of 4-8mg KOH/g.

By adopting the technical scheme, the macromolecular saturated polyester resin has good flexibility and adhesive force. Therefore, the macromolecular saturated polyester resin and the special polyester resin are selected as film forming resins, and the formed paint film has good adhesive force and flexibility.

Preferably, the rust inhibitive pigment comprises a calcium ion-exchanged silicate or a mixture of zinc phosphate and a calcium ion-exchanged silicate.

By adopting the technical scheme, the zinc phosphate is used for carrying out surface treatment on the base material, and then the silicate rust prevention mechanism of calcium ion exchange is matched, so that the rust prevention performance of a paint film is greatly improved.

Preferably, the curing agent comprises a blocked HDI trimer resin and a fully methylated melamine formaldehyde resin.

By adopting the technical scheme, the closed HDI trimer resin is selected as the curing agent to cure the polyester resin, so that a polyurethane paint film with excellent water resistance is formed, the primer still has higher flexibility and tensile property when being cured at higher speed, and the application of the primer in the field of high-speed coating is increased.

Preferably, the universal antirust primer for the household appliance building materials is prepared from the following raw materials in percentage by weight:

10-30% of special polyester resin;

20-40% of saturated polyester resin;

2-4% of epoxy phosphate;

4-10% of nano barium sulfate;

0-5% of zinc phosphate;

3-6% of calcium ion exchange silicate;

3-5% of a closed HDI trimer resin;

2-4% of fully methylated melamine formaldehyde resin;

3-8% of a solvent;

4.9-10% of other auxiliary agents.

By adopting the technical scheme, the special polyester resin and the macromolecule saturated polyester resin are adopted as film forming mediums, the solvent consumption is low, the obtained primer is moderate in viscosity, high in coating rate and low in coating cost, and is applied to coating of building steel, household appliance and other coiled materials, and a cured paint film has excellent adhesive force, antirust capability and flexibility, so that the applicability of the primer is improved.

Preferably, the universal antirust primer for the household appliance building materials is prepared from the following raw materials in percentage by weight:

10-25% of special polyester resin;

25-40% of saturated polyester resin;

3-4% of epoxy phosphate;

4-6% of nano barium sulfate;

0-5% of zinc phosphate;

3-6% of calcium ion exchange silicate;

3-5% of a closed HDI trimer resin;

2-4% of fully methylated melamine formaldehyde resin;

3-8% of a solvent;

4.9-10% of other auxiliary agents.

By adopting the technical scheme, the dosage of the special polyester resin, the saturated polyester resin, the nano barium sulfate and the epoxy phosphate in the primer is further optimized, so that the nano barium sulfate and the epoxy phosphate can be promoted to be tightly combined, the compactness and the flexibility of a paint film are improved, and the adhesive force and the rust resistance of the paint film are improved.

In a second aspect, the application provides a preparation method of a general antirust primer for household appliance building materials, which adopts the following technical scheme:

a preparation method of a general antirust primer for household appliance building materials comprises the following steps:

s1: firstly, stirring and mixing special polyester resin, epoxy phosphoric acid and a solvent, then adding nano barium sulfate, an antirust pigment and a whitening pigment, stirring and mixing, and grinding until the fineness is less than 10 mu m to obtain a mixture;

S2: and adding the curing agent, the saturated polyester resin and other auxiliary agents into the mixture, and stirring and mixing to obtain the universal antirust primer for the household appliance building materials.

By adopting the technical scheme, the mixed grinding fineness of part of raw materials is less than 10 mu m, the dispersibility of the raw materials is excellent, a compact paint film can be formed on the surface of a base material, and the adhesive force and the rust prevention capability are good.

In summary, the application has the following beneficial effects:

1. according to the application, epoxy phosphate and nano barium sulfate are used as surface treatment agents, so that the adhesive force of a paint film to the surface of a substrate can be increased, and the rust prevention effect of the paint film to the substrate can be improved;

2. The special polyester resin and the macromolecule saturated polyester resin are used as film forming mediums, and the closed HDI trimer resin and the full methyl ether melamine are mixed to form a curing system, so that a paint film has higher coating rate and adhesive force, and the cured paint film has higher antirust performance, flexibility and tensile performance, and has wide applicability in building steel coating, household appliance coating and other coiled material coating;

3. the preparation method of the primer is simple, and by grinding part of raw materials, the raw materials can be promoted to be tightly combined, so that the compactness of a paint film is improved, and the primer is suitable for mass production.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials in the examples of the present application are commercially available except for the following specific descriptions.

The special polyester resin has the code of R280B, the molecular weight of 6500, the hydroxyl value of 25 and the glass transition temperature of 28 ℃, and is self-made by the company;

Saturated polyester resin with the brand of SK chemical ES410, molecular weight of 16000 and hydroxyl value of 4-8mg KOH/g;

Zinc phosphate, brand number SNCZ in france;

Calcium ion exchanged silicate purchased from tin-free Hui Gecheng;

Blocked HDI trimer resin, brand bayer chemistry 3075;

The full methyl ether melamine formaldehyde resin is named as vinca chemical MR603;

epoxy phosphate, brand compliant chemical SY9975, acid value of 20-50mg KOH/g and solid content of 73-77%;

The nanometer barium sulfate is fine barium, the barium sulfate content is more than or equal to 98%, the pH value is 6.5-8.0, the oil absorption is 15-20g/100g, the volatile matter at 105 ℃ is less than or equal to 0.20%, the iron content is less than or equal to 0.001%, the burning weight loss is less than or equal to 1.20%, the sulfide content is less than or equal to 0.0035%, the whiteness is more than or equal to 98.5, the water-soluble matter content is 0.10%, the fineness (45 mu m experimental screen residue) is 0.0010%, the Markov particle size distribution is less than or equal to 0.5), the D (0.5) is less than or equal to 0.3 mu m, and the D (0.9) is less than or equal to 0.3 mu m;

Titanium dioxide, brand Dongjia R2377;

DBE purchased from Shandong Yili.

Performance detection

The general antirust primer for household appliance building materials prepared by the embodiment of the application and the primer prepared by the comparative example are subjected to detection on adhesive force, salt spray resistance, flexibility and water resistance, and the detection method is as follows:

Adhesion force: reference is made to the GB 1720-1979 standard test;

Salt spray resistance: referring to GB/T1771-2007 standard, detecting the time that the surface of the plate is free from foaming and rust, the coating film at the scratch position is damaged or the rust width is less than or equal to 2mm (one-way), and the prying adhesive force of the blade is not obviously reduced;

Flexibility: detecting by referring to GB/T1731 standard;

Water resistance: GB/T5209 standard detection.

Examples

Example 1

A general antirust primer for household appliance building materials is prepared from the following raw materials in parts by weight (kg).

The preparation method of the universal antirust primer for the household appliance building materials comprises the following steps:

S1: firstly, stirring and mixing special polyester resin R280B, epoxy phosphoric acid SY9975, a dispersing agent and a solvent, then adding titanium pigment, nano barium sulfate (fine barium) and an anti-rust pigment, stirring and mixing for 30min at 800-1000R/min (1000R/min in the embodiment of the application), and grinding until the fineness is less than 10 mu m to obtain a mixture;

s2: adding the curing agent, the saturated polyester resin ES410, the catalyst, the leveling defoamer and the DBE into the mixture, and stirring and mixing for 20-30min (30 min in the embodiment of the application) to obtain the universal antirust primer for the household appliance building materials.

Examples 2 to 5

The general rust inhibitive primer for home appliances was different from example 1 in that the respective raw materials and the weight (kg) thereof are shown in the following table.

The general antirust primer for household appliance building materials prepared in the examples 1-5 is subjected to adhesion and salt spray resistance detection, and the detection results are shown in the following table.

As can be seen from the data analysis of the table, the general antirust primer for the household appliance building materials, which is prepared in the embodiment 1-5, has the adhesive force less than or equal to 2 grades, has no bubbling and rust on the surface of the board within 600-1000 hours, and has no damage to the coating film at the scratch or no obvious reduction of the prying adhesive force of the blade, wherein the width of the rust is less than or equal to 2mm (one way). From this, it is shown that the general antirust primer for household electrical appliance building materials prepared in examples 1-5 of the application has good adhesion and salt spray resistance.

Meanwhile, compared with examples 2 and 3, the adhesive force of examples 1,4 and 5 is less than or equal to 1 level, and the salt spray resistance time is as high as 900-1000h. Therefore, in the general raw materials for preparing the general antirust primer for the household appliance building materials, when the general antirust primer for the household appliance building materials is prepared by mixing 10-25% of special polyester resin, 25-40% of saturated polyester resin, 3-4% of epoxy phosphate, 4-6% of nano barium sulfate, 5% of zinc phosphate, 6% of calcium ion exchange silicate, 3% of closed HDI trimer resin, 3-4% of full methylated melamine formaldehyde resin, 8% of solvent and 8% of other auxiliary agents, the adhesive force and the salt spray resistance of the general antirust primer for the household appliance building materials can be improved. The analysis is possible because the nano barium sulfate, epoxy phosphate, rust-proof pigment and other raw materials can be tightly combined in two resins and react with the surface of the substrate to form chemical bonds, so that the adhesive force and compactness of a paint film are improved, and the rust-proof performance of the primer is improved.

Example 6

A general antirust primer for household appliance building materials is different from example 1 in that the epoxy resin is RT-3380, the acid value of epoxy phosphate is 29-32mg KOH/g, and the solid content is 72%.

Example 7

A general antirust primer for household appliance building materials is different from example 1 in that nano barium sulfate is YJH-5HB in model number, the content of barium sulfate is more than or equal to 97%, the pH value is 6.5-8.0, the oil absorption is 15-20g/100g, the fineness (D97) is less than or equal to 4.0 μm, the volatile matter at 105 ℃ is less than or equal to 0.30%, the screening matter at 45 μm is less than or equal to 0.05%, and the water soluble matter is less than or equal to 0.20.

The general antirust primer for household appliance building materials prepared in the examples 6 to 7 is subjected to adhesion and salt spray resistance detection, and the detection results are shown in the following table.

As can be seen from the data analysis of the above table, the adhesion force of example 1 is less than or equal to 1 grade, and the salt spray resistance time is improved by 17.65-25.00% compared with examples 6 and 7. Therefore, the epoxy phosphate SY9975 and the nanometer barium sulfate (fine barium) are adopted as raw materials in the total raw materials for preparing the universal antirust primer for the household appliance building materials, so that the adhesive force and the salt spray resistance of the universal antirust primer for the household appliance building materials can be improved.

Example 8

A general antirust primer for household appliance building materials is different from the special polyester resin in example 1 in that the special polyester resin is KDD737 which is a Keding modified polyester resin, the molecular weight is 10000-20000, the hydroxyl value is 23mg KOH/g, and the glass transition temperature is 50 ℃.

Example 9

A general antirust primer for household appliance building materials is different from example 1 in that the molecular weight of saturated polyester resin is 3000, the hydroxyl value (without solvent) is 92-98mg KOH/g, the acid value (without solvent) is 3-7mg KOH/g, the glass transition temperature (solid) is 20 ℃, and the density (solution) is 1.09g/cm ³.

The general antirust primer for the household appliance building materials prepared in the examples 8 and 9 is subjected to adhesion, salt spray resistance and flexibility detection, and the detection results are shown in the following table.

As can be seen from the data analysis of the above table, the adhesion force of example 1 is less than or equal to 1 grade, the salt spray resistance time is relatively improved by 28.21-33.33%, and the flexibility is as low as 1mm compared with examples 8 and 9. Therefore, in the total raw materials for preparing the universal antirust primer for the household appliance building materials, when the molecular weight of the special polyester resin is 6500, the hydroxyl value is 20-30mg KOH/g, the molecular weight of the macromolecular saturated polyester resin is 16000, and the hydroxyl value is 4-8mg KOH/g, the adhesive force, the salt fog resistance and the flexibility of the universal antirust primer for the household appliance building materials can be improved. The reason for analysis is probably that the macromolecule saturated polyester resin and the special polyester resin are selected as film forming resins, and the prepared primer has moderate viscosity and higher coating rate, so that the cured paint film has excellent adhesive force, rust-proof capability and flexibility, can be applied to the fields of building steel coating, household appliance coating and other coiled material coating, and has wider applicability.

Example 10

The general antirust primer for household appliance building materials is different from the embodiment 1 in that an equal weight of fully methylated melamine formaldehyde resin is adopted to replace a closed HDI trimer resin.

The general rust inhibitive primer for home appliances prepared in example 10 of the present application was subjected to water resistance test, and the test results are shown in the following table.

As can be seen from the data analysis of the above table, in example 1, the phenomena of foaming, wrinkling, rusting, light loss, discoloration and falling off did not occur after soaking in water (40.+ -. 1 ℃ C.) for 120 hours as compared with example 10. Therefore, in the total raw materials for preparing the universal antirust primer for the household appliance building materials, the closed HDI trimer resin is selected as a curing agent to cure the polyester resin, so that a polyurethane paint film with excellent water resistance is formed, and the water resistance of the paint film can be improved.

Comparative example

Comparative example 1

A rust inhibitive primer, which is different from example 1 in that the epoxy phosphate, brand VR226W, acid value 50-70mg KOH/g, and solid content 53-57%.

Comparative example 2

A rust preventive primer is different from example 1 in that the nano barium sulfate type is GX-15A, the barium sulfate+strontium content is not less than 96%, the pH value is 6.5-8.0, the oil absorption is 12-15g/100g, the average particle size (D50) is not more than 1.4 μm, the large particle size (D97) is not more than 3.60 μm, the iron oxide content is not more than 0.01%, and the moisture is not more than 0.20.

Comparative example 3

An anti-rust primer is different from example 1 in that an equal weight of epoxy phosphate is used instead of nano barium sulfate.

Comparative example 4

An anticorrosive primer is different from example 1 in that an equivalent weight of a special polyester resin is used instead of a saturated polyester resin.

Comparative example 5

An anticorrosive primer is different from example 1 in that an equal weight of saturated polyester resin is used instead of the special polyester resin.

The anti-rust primer prepared in comparative examples 1 to 5 of the present application was tested for adhesion, salt spray resistance and flexibility, and the test results are shown in the following table.

As can be seen from the data analysis of the above table, the adhesion rating of example 1 is as low as 1 and the salt spray resistance time is improved by 150-233.33% compared with comparative examples 1-3. Therefore, in the general raw materials for preparing the universal antirust primer for the household appliance building materials, nano barium sulfate and epoxy phosphate are selected as adhesion promoters, so that the adhesion and salt spray resistance of the primer can be improved. The reason for analysis is probably that the nano barium sulfate has high activation degree and better compatibility with raw materials such as epoxy phosphate, rust-proof pigment and the like, the formed mixed raw materials can be tightly combined and then are tightly adhered on the surface of a substrate to form a compact paint film, so that the rust-proof capability of the paint film is improved.

Compared with comparative examples 4 and 5, the adhesion grade of example 1 is as low as 1 grade, the salt spray resistance time is relatively improved by 100-122.22%, and the flexibility is as low as 1mm. Therefore, in the general raw materials for preparing the universal antirust primer for the household appliance building materials, special polyester resin and saturated resin are selected as film forming mediums, so that the adhesive force, salt spray resistance and flexibility of the primer can be improved. The reason for this analysis is probably that the primer described above is moderate in viscosity, high in coating rate and excellent in processability, so that the cured paint film is excellent in adhesion, rust inhibitive ability and flexibility.

Meanwhile, in the high-tensile thick plate primer of the home electric primer at present, macromolecular saturated polyester resin is mainly adopted as a film forming medium; in the common home appliance primer, polyester resin with medium molecular weight is mainly used as a film forming medium. The two home appliance priming paint needs to be solidified by adopting different systems due to the production line requirement, even needs to be subdivided into more formulas due to different requirements on neutral salt mist resistance, and causes great trouble to production management. However, the special polyester resin and the saturated resin are selected as film forming mediums, and the special raw material type using amount system is combined to prepare the antirust primer, so that the antirust primer has higher adhesive force, antirust performance and environmental protection performance, can be used for household appliances and building materials, and has wider applicability.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (8)

1. The universal antirust primer for the household appliance building materials is characterized by being prepared from the following raw materials in percentage by weight:

10-30% of special polyester resin;

20-40% of saturated polyester resin;

2-4% of epoxy phosphate;

4-10% of nano barium sulfate;

3-11% of rust-proof pigment;

4-8% of whitening pigment;

5-9% of curing agent;

3-8% of a solvent;

4.9-10% of other auxiliary agents;

The acid value of the epoxy phosphate is 20-50mg KOH/g, and the solid content is 73-77%;

the barium sulfate content of the nano barium sulfate is more than or equal to 98%, the pH value is 6.5-8.0, and the oil absorption is 15-20g/100g.

2. The universal antirust primer for household appliances according to claim 1, wherein the molecular weight of the special polyester resin is 6500-20000, the hydroxyl value is 23-25mg KOH/g, and the glass transition temperature is 28-50 ℃.

3. The universal rust inhibitive primer for household appliances according to claim 1, wherein the saturated polyester resin has a molecular weight of 16000 and a hydroxyl value of 4-8 mg KOH/g.

4. The universal rust inhibitive primer for home appliances building materials according to claim 1, wherein the rust inhibitive pigment comprises a calcium ion-exchanged silicate or a mixture of zinc phosphate and a calcium ion-exchanged silicate.

5. The universal rust inhibitive primer for home appliances according to claim 5, wherein the curing agent comprises a blocked HDI trimer resin and a fully methylated melamine formaldehyde resin.

6. The universal antirust primer for household appliances according to claim 5, which is characterized by being prepared from the following raw materials in percentage by weight:

10-30% of special polyester resin;

20-40% of saturated polyester resin;

2-4% of epoxy phosphate;

4-10% of nano barium sulfate;

0-5% of zinc phosphate;

3-6% of calcium ion exchange silicate;

3-5% of a closed HDI trimer resin;

2-4% of fully methylated melamine formaldehyde resin;

3-8% of a solvent;

4.9-10% of other auxiliary agents.

7. The universal antirust primer for household appliances according to claim 6, which is characterized by being prepared from the following raw materials in percentage by weight:

10-25% of special polyester resin;

25-40% of saturated polyester resin;

3-4% of epoxy phosphate;

4-6% of nano barium sulfate;

0-5% of zinc phosphate;

3-6% of calcium ion exchange silicate;

3-5% of a closed HDI trimer resin;

2-4% of fully methylated melamine formaldehyde resin;

3-8% of a solvent;

4.9-10% of other auxiliary agents.

8. The method for preparing the universal antirust primer for the household appliance building materials, which is characterized by comprising the following steps of:

s1: firstly, stirring and mixing special polyester resin, epoxy phosphoric acid and a solvent, then adding nano barium sulfate, an antirust pigment and a whitening pigment, stirring and mixing, and grinding to obtain a mixture;

S2: and adding the curing agent, the saturated polyester resin and other auxiliary agents into the mixture, and stirring and mixing to obtain the universal antirust primer for the household appliance building materials.