阅读说明：本技术 抗下陷聚氨酯透明底漆及其制备方法 (Anti-sinking polyurethane transparent primer and preparation method thereof ) 是由 汤凌柏 沈超锜 于 2020-12-30 设计创作，主要内容包括：本发明涉及一种抗下陷聚氨酯透明底漆及其制备方法,包含以下主剂、固化剂和稀释剂:其中,所述主剂主要由以下组分按照以下重量份数比制备而成：所述稀释剂主要由以下组分按照以下重量份数比制备而成：二甲苯20-30份醋酸丁酯50-70份丙二醇甲醚醋酸酯8-15份；所述固化剂主要由以下组分按照以下重量份数比制备而成：芳香族异氰酸酯40-65份三聚体异氰酸酯10-30份醋酸丁酯20-35份。该发明克服了传统底漆对木材填充性差,漆膜干燥后发生下陷,需要多次涂刷,成本高且不环保等缺点,具有透明度及填充性佳、省工序、节约成本、更环保等优点。(The invention relates to an anti-sinking polyurethane transparent primer and a preparation method thereof, wherein the primer comprises the following main agent, curing agent and diluent, wherein the main agent is mainly prepared from the following components in parts by weight:)

1. An anti-sinking polyurethane transparent primer is characterized in that: comprises the following main agent, curing agent and diluent:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

20-30 parts of dimethylbenzene

50-70 parts of butyl acetate

8-15 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

40-65 parts of aromatic isocyanate

10-30 parts of tripolymer isocyanate

20-35 parts of butyl acetate.

2. The sag resistant polyurethane clear primer according to claim 1, wherein: the defoaming agent is a modified silicone defoaming agent.

3. The sag resistant polyurethane clear primer according to claim 1, wherein: the zinc powder is zinc stearate.

4. The sag resistant polyurethane clear primer according to claim 1, wherein: the anti-settling agent is polyethylene wax.

5. The sag resistant polyurethane clear primer according to claim 1, wherein: when in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1-1.5:0.5-0.8: 0.6-1.

6. The method for preparing the sag-resistant polyurethane clear primer according to any one of claims 1 to 5, wherein: mainly comprises the following steps which are carried out in sequence:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 5-8 minutes at the speed of 600-800 rpm; then adding zinc powder and wax powder with the molecular weight of 3000-; then propylene glycol methyl ether acetate and butyl ester are added in, dispersed for 5-8 minutes at the speed of 600-800 r/min, and the main agent is obtained after uniform mixing;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 3-8 minutes at the speed of 300-700 rpm, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 3-8 minutes at the speed of 300-700 r/min, and uniformly mixing to obtain the curing agent.

7. The method for preparing the sag-resistant polyurethane clear primer according to claim 6, wherein: the preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1-1.5:0.5-0.8:0.6-1 to obtain the sinking-resistant polyurethane transparent primer.

8. The method for preparing the sag-resistant polyurethane clear primer according to claim 7, wherein: the preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: after the preparation of the main agent is finished, the main agent is filtered by a filter screen of 80-120 meshes, after the preparation of the diluent is finished, the diluent is filtered by a filter screen of 300-500 meshes, and after the preparation of the curing agent is finished, the curing agent is filtered by a filter screen of 300-500 meshes.

Technical Field

The invention relates to an anti-sinking polyurethane transparent primer and a preparation method thereof, which are particularly applied to the field of coatings for sealing deep catheter materials.

Background

The traditional priming paint has the filling powder mostly using talcum powder, and has various problems in use: 1. the method is characterized in that the conduit of the deep conduit materials such as wood is not completely filled, a plurality of primer coats are required to be coated in the existing painting process of the traditional primer to the wood to complete the sealing of the conduit, and the existing painting process of the traditional primer to the deep conduit materials such as wood specifically comprises the following steps:

table 1 traditional lacquering process flow chart

Wherein, the polyurethane clear bottom is a primer; 2. after a plurality of (at least 3) priming coats are coated in the process to fill the wood guide pipe, a paint film is large in shrinkage after being dried, and the problem of sinking is easy to occur; 3. because more priming paint is sprayed, the transparency of a paint film is greatly influenced, and the paint film is high in cost and not environment-friendly. In the environment-friendly environment, various factories try to reduce the discharge amount of harmful substances of paint, and the pain point of the factory is about to be solved for customers as a paint factory of an upstream enterprise.

Therefore, it is desirable to provide a transparent polyurethane primer with better transparency and filling property, simplified process, reduced cost, environmental protection and sagging resistance, and a preparation method thereof.

Disclosure of Invention

In order to overcome the defects that the traditional primer has poor catheter filling performance on deep catheter materials such as wood, a paint film sinks after being dried, multiple brushing is needed, the cost is high, the environment is not protected, and the like, the invention provides the anti-sinking polyurethane transparent primer and the preparation method thereof.

The technical scheme of the invention is as follows:

an anti-sagging polyurethane clear primer comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

20-30 parts of dimethylbenzene

50-70 parts of butyl acetate

8-15 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

40-65 parts of aromatic isocyanate

10-30 parts of tripolymer isocyanate

20-35 parts of butyl acetate.

According to the anti-sinking polyurethane transparent primer, the talcum powder serving as the filling powder in the traditional primer is replaced by the wax powder with high molecular weight (the molecular weight is 3000-plus 5000), and the preferable components and the dosage proportion thereof in the system are matched, so that the transparency and the filling property of the paint are improved, the paint film is not easy to sink, the high filling property of the paint adopts the same spraying method as the traditional painting process, the procedure of the primer can be reduced during construction, the dosage of the paint is reduced, the cost is reduced, the production efficiency is improved, the discharge amount of harmful substances is reduced, the paint is better green and environment-friendly, the dosage is less, the coating is thinner, the texture of the material is more striking, the color is more bright, the conduit is clearer, and the surface is more refreshing. Wherein, the wax powder of high molecular weight fills effectually, and the effect of other components: the resin plays a role in film formation, the butyl ester, the dimethylbenzene and the propylene glycol monomethyl ether acetate play a role in dissolution, the defoaming agent plays a role in defoaming, the zinc powder plays a role in primer polishing, and the anti-settling agent can play a role in prolonged storage. The new painting process flow of the anti-sinking polyurethane transparent primer is shown in the table 2. The anti-sinking polyurethane transparent primer can be applied to various furniture, is particularly suitable for furniture with high anti-sinking requirement, and is particularly suitable for totally-enclosed coating of deep conduit materials.

TABLE 2 New lacquering process flow chart

And as is apparent from table 3, the preferred components of the thinner have boiling points of more than or equal to 60 ℃, and the thinner has proper volatilization speed, so that the surface forming effect of the coating can be improved during coating.

TABLE 3 boiling points of the components of the diluent for the paint of this case

Name (R)	Boiling point
		Xylene	137℃
Acetic acid butyl ester	126.5℃
		Propylene glycol methyl ether acetate	146℃

The defoaming agent is a modified silicone defoaming agent.

The preferable defoaming agent has low cost and better defoaming effect.

The zinc powder is zinc stearate.

Zinc powder is preferred to further enhance the sandability of the primer.

The anti-settling agent is polyethylene wax.

The preferred anti-settling agents further improve the storage stability of the product.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1-1.5:0.5-0.8: 0.6-1.

The optimized anti-sinking polyurethane transparent primer has the advantage that the whole effect of the product can be improved by the proportion of each component.

The preparation method of the sinking-resistant polyurethane transparent primer is characterized by comprising the following steps: mainly comprises the following steps which are carried out in sequence:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 5-8 minutes at the speed of 600-800 rpm; then adding zinc powder and wax powder with the molecular weight of 3000-; then propylene glycol methyl ether acetate and butyl ester are added in, dispersed for 5-8 minutes at the speed of 600-800 r/min, and the main agent is obtained after uniform mixing;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 3-8 minutes at the speed of 300-700 rpm, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 3-8 minutes at the speed of 300-700 r/min, and uniformly mixing to obtain the curing agent.

The preparation process of the sinking-resistant polyurethane transparent primer is simple and convenient, and the operation is convenient.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1-1.5:0.5-0.8:0.6-1 to obtain the sinking-resistant polyurethane transparent primer.

When the anti-sinking polyurethane transparent primer is used, only the main agent, the curing agent and the diluent need to be simply mixed, so that the primer is very convenient.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: after the preparation of the main agent is finished, the main agent is filtered by a filter screen of 80-120 meshes, after the preparation of the diluent is finished, the diluent is filtered by a filter screen of 300-500 meshes, and after the preparation of the curing agent is finished, the curing agent is filtered by a filter screen of 300-500 meshes.

Because the material can be mixed with particles or pollutants when the finished product is produced and prepared, the percent of pass of the finished product can be improved by adding the filtering procedure.

Compared with the prior art, the method has the following advantages:

1) the anti-sinking polyurethane transparent primer replaces the talcum powder of the filling powder in the traditional primer with the wax powder with high molecular weight (molecular weight of 3000-Is transparentBetter degree and filling property, labor saving, cost saving and environmental protection, and is particularly suitable for totally-enclosed coating of deep conduit materials;

2) the preparation method of the anti-sinking polyurethane transparent primer is simple and convenient in process, and the main agent, the curing agent and the diluent are simply mixed when the primer is used, so that the operation is very convenient.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the embodiments of the specification.

Example 1

The invention relates to an anti-sinking polyurethane transparent primer, which comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

25 parts of dimethylbenzene

Butyl acetate 63 parts

12 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

45 parts of aromatic isocyanate

Trimer isocyanate 23 parts

32 parts of butyl acetate.

The defoaming agent is a modified silicone defoaming agent.

The zinc powder is zinc stearate.

The anti-settling agent is polyethylene wax.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1:0.5: 0.6.

The preparation method of the anti-sinking polyurethane transparent primer mainly comprises the following steps of:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 6 minutes at the speed of 700 revolutions per minute; then adding zinc powder and wax powder with the molecular weight of 4000 into the mixture, and dispersing the mixture for at least 15 minutes at the speed of 1100 revolutions per minute; then propylene glycol methyl ether acetate and butyl ester are added into the mixture, the mixture is dispersed for 6 minutes at the speed of 700 revolutions per minute, and the main agent is obtained after the mixture is uniformly mixed;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 6 minutes at the speed of 400 revolutions per minute, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 6 minutes at the speed of 400 r/min, and uniformly mixing to obtain the curing agent.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1:0.5:0.6 to obtain the anti-sinking polyurethane transparent primer.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: the main agent is filtered by a 80-mesh filter screen after being prepared, the diluent is filtered by a 300-mesh filter screen after being prepared, and the curing agent is filtered by a 300-mesh filter screen after being prepared.

Example 2

The invention relates to an anti-sinking polyurethane transparent primer, which comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

25 parts of dimethylbenzene

65 portions of butyl acetate

10 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

48 parts of aromatic isocyanate

Trimer isocyanate 20 parts

32 parts of butyl acetate.

The defoaming agent is a modified silicone defoaming agent.

The zinc powder is zinc stearate.

The anti-settling agent is polyethylene wax.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1.2:0.6: 0.8.

The preparation method of the anti-sinking polyurethane transparent primer mainly comprises the following steps of:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 8 minutes at the speed of 600 revolutions per minute; then adding zinc powder and wax powder with molecular weight of 3000, and dispersing at 1000 rpm for 20 min; then propylene glycol methyl ether acetate and butyl ester are added into the mixture, the mixture is dispersed for 5 minutes at the speed of 800 revolutions per minute, and the main agent is obtained after the mixture is uniformly mixed;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 8 minutes at the speed of 300 revolutions per minute, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 8 minutes at the speed of 300 revolutions per minute, and uniformly mixing to obtain the curing agent.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): and uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1.2:0.6:0.8 to obtain the anti-sinking polyurethane transparent primer.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: the main agent is filtered by a 100-mesh filter screen after being prepared, the diluent is filtered by a 400-mesh filter screen after being prepared, and the curing agent is filtered by a 400-mesh filter screen after being prepared.

Example 3

The invention relates to an anti-sinking polyurethane transparent primer, which comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

28 parts of dimethylbenzene

58 portions of butyl acetate

14 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

60 parts of aromatic isocyanate

Trimer isocyanate 20 parts

And 20 parts of butyl acetate.

The defoaming agent is a modified silicone defoaming agent.

The zinc powder is zinc stearate.

The anti-settling agent is polyethylene wax.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1.3:0.65: 0.6.

The preparation method of the anti-sinking polyurethane transparent primer mainly comprises the following steps of:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 5 minutes at the speed of 800 revolutions per minute; then adding zinc powder and wax powder with the molecular weight of 5000 into the mixture, and dispersing the mixture for 18 minutes at the speed of 1200 revolutions per minute; then propylene glycol methyl ether acetate and butyl ester are added into the mixture, the mixture is dispersed for 8 minutes at the speed of 600 revolutions per minute, and the main agent is obtained after the mixture is uniformly mixed;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 3 minutes at the speed of 700 revolutions per minute, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 3 minutes at the speed of 700 revolutions per minute, and uniformly mixing to obtain the curing agent.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): and uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1.3:0.65:0.6 to obtain the anti-sinking polyurethane transparent primer.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: the main agent is filtered by a 120-mesh filter screen after being prepared, the diluent is filtered by a 500-mesh filter screen after being prepared, and the curing agent is filtered by a 500-mesh filter screen after being prepared.

Example 4

The invention relates to an anti-sinking polyurethane transparent primer, which comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

27 parts of dimethylbenzene

Butyl acetate 63 parts

10 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

58 parts of aromatic isocyanate

Trimer isocyanate 15 parts

27 parts of butyl acetate.

The defoaming agent is a modified silicone defoaming agent.

The zinc powder is zinc stearate.

The anti-settling agent is polyethylene wax.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1.5:0.75: 0.9.

The preparation method of the anti-sinking polyurethane transparent primer mainly comprises the following steps of:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 5-8 minutes at the speed of 600-800 rpm; then adding zinc powder and wax powder with the molecular weight of 3000-; then propylene glycol methyl ether acetate and butyl ester are added in, dispersed for 5-8 minutes at the speed of 600-800 r/min, and the main agent is obtained after uniform mixing;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 3-8 minutes at the speed of 300-700 rpm, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 3-8 minutes at the speed of 300-700 r/min, and uniformly mixing to obtain the curing agent.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): and uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1.5:0.75:0.9 to obtain the anti-sinking polyurethane transparent primer.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: the main agent is filtered by a 80-mesh filter screen after being prepared, the diluent is filtered by a 300-mesh filter screen after being prepared, and the curing agent is filtered by a 300-mesh filter screen after being prepared.

Example 5

The invention relates to an anti-sinking polyurethane transparent primer, which comprises the following main agents, curing agents and diluents:

the main agent is mainly prepared from the following components in parts by weight:

the diluent is mainly prepared from the following components in parts by weight:

30 portions of dimethylbenzene

55 portions of butyl acetate

15 parts of propylene glycol methyl ether acetate;

the curing agent is mainly prepared from the following components in parts by weight:

48 parts of aromatic isocyanate

Trimer isocyanate 20 parts

32 parts of butyl acetate.

The defoaming agent is a modified silicone defoaming agent.

The zinc powder is zinc stearate.

The anti-settling agent is polyethylene wax.

When in use, the anti-sinking polyurethane transparent primer is prepared by mixing a main agent, a curing agent and a diluent according to the weight part ratio of 1.4:0.7: 0.8.

The preparation method of the anti-sinking polyurethane transparent primer mainly comprises the following steps of:

preparing a main agent:

the preparation method of the main agent mainly comprises the following steps of sequentially carrying out:

mixing alkyd resin, castor oil resin, dimethylbenzene, an anti-settling agent and a defoaming agent, and dispersing for 5-8 minutes at the speed of 600-800 rpm; then adding zinc powder and wax powder with the molecular weight of 3000-; then propylene glycol methyl ether acetate and butyl ester are added in, dispersed for 5-8 minutes at the speed of 600-800 r/min, and the main agent is obtained after uniform mixing;

(II) preparing a diluent:

the preparation method of the diluent mainly comprises the following steps of sequentially carrying out:

mixing xylene, butyl acetate and propylene glycol monomethyl ether acetate, dispersing for 3-8 minutes at the speed of 300-700 rpm, and uniformly mixing to obtain the diluent;

(III) preparing a curing agent:

the preparation method of the curing agent mainly comprises the following steps of sequentially carrying out:

mixing aromatic isocyanate, tripolymer isocyanate and butyl acetate, dispersing for 3-8 minutes at the speed of 300-700 r/min, and uniformly mixing to obtain the curing agent.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a working procedure of preparing the anti-sinking polyurethane transparent primer after the step (III): and uniformly mixing the main agent, the curing agent and the diluent according to the weight part ratio of 1.4:0.7:0.8 to obtain the anti-sinking polyurethane transparent primer.

The preparation method of the anti-sinking polyurethane transparent primer also comprises a filtering process arranged between the step (three) and the quality inspection process of the anti-sinking polyurethane transparent primer preparation process: the main agent is filtered by a 80-mesh filter screen after being prepared, the diluent is filtered by a 300-mesh filter screen after being prepared, and the curing agent is filtered by a 300-mesh filter screen after being prepared.

The raw material sources used in the embodiments of the scheme are as follows:

alkyd resin: foshan tuopao, neat resin TP 3910;

castor oil resin: three trees, DR 2015;

wax powder with molecular weight of 3000-: nanjing, Tencel wax 779;

zinc powder: guangdong Hanwei, TV-A;

anti-settling agent: disibulone, 6900-20X;

defoaming agent: german Bike, 141.

Experimental data:

paint performance detection of (I) anti-sagging polyurethane clear primer

The detection method comprises the following steps: according to GBT23997-2009

Table 4 paint performance test results for each example

As is apparent from Table 4, the technical performance of each example of the present invention reaches or is higher than the technical index of the national standard GB/T23997-2009, and the dry-dry type wear-resistant paint has the advantages of fast drying, high hardness, and better wear resistance, adhesion and dry heat resistance.

Environmental protection performance detection of (II) anti-sinking polyurethane transparent primer

The detection method comprises the following steps: according to GB18581-2009

TABLE 5 test results of environmental protection Properties of the examples

It is obvious from table 5 that the VOC (volatile organic compounds) and soluble heavy metals contained in the examples of the present invention are superior to the GB18581-2009 standard, meet the environmental and health requirements, and are safe and reliable to use. The paint film has certain scratch resistance

(III) workability detection of anti-sinking polyurethane transparent primer

The detection method comprises the following steps:

viscosity test method: at 25 ℃, the No. 4 cup of the rock field is filled with paint, and the number of seconds can be emptied by testing, and the result is the number of seconds of viscosity;

paint film thickness test method: after the paint film had dried, the paint film thickness was measured using a special test instrument.

TABLE 6 test results of workability in examples

As is apparent from Table 6, the viscosity of each example of the present invention meets the requirement of primer spraying, and the paint film thickness is relatively thick (the thickness of the conventional primer is generally 20-25um), so that one primer application can be saved.

(IV) detection of Effect of Process on Performance

The detection method comprises the following steps:

transparency: observing with naked eyes;

TABLE 7 comparison of the Performance of this case with that of the prior art lacquering

As is apparent from Table 7, the VOC emissions of the examples of this case are reduced by about 1/3 compared to the prior art lacquering process, the transparency is better, and the resistance of the lacquer film to sagging is better.

The anti-sagging polyurethane clear primer and the method for preparing the same according to the present invention are not limited to the above-mentioned examples, and any modification or replacement according to the principle of the present invention should be within the scope of the present invention.