CN117402528A - Color varnish and preparation method and application thereof - Google Patents

Abstract

The invention discloses a color varnish, which comprises the following components in parts by weight: 9-11 parts of polyester resin, 1.5-2 parts of wetting dispersant, 15.1-21 parts of solvent, 4-5 parts of inorganic pigment, 0.101-1.01 part of flatting agent, 0.5-2 parts of ultraviolet absorber, 0.1-1 part of acrylic dispersant and acrylic resin; wherein the acrylic resin consists of acrylic resin A, acrylic resin B and acrylic resin C; and acrylic resin a, acrylic resin B, and acrylic resin C are different from each other. The color varnish is generally used for different colors, is suitable for matching with the existing color paints with various colors, can effectively reduce the tarnish and chroma, and has the characteristics of good appearance and high storage stability. The invention also discloses a preparation method and application of the color varnish.

Description

Color varnish and preparation method and application thereof

Technical Field

The invention relates to the technical field of paint. More particularly, to a color varnish, a preparation method and application thereof.

Background

The color varnish is a high-temperature curing varnish, and weather-resistant superfine toner with different colors is added into the formula of the color varnish to give the substrate a better appearance. The existing color varnish has the problems that the color is single, the color can not be changed according to the needs of customers, the transparency of the varnish is poor after the toner is added, the metal texture of the bottom layer is weakened, and the like. For example, CN105176256a is a three-step color varnish for repairing automobiles, which is prepared by mixing the following components in parts by weight: 5-20 parts of 2K red master batch and 80-95 parts of high weather-proof transparent varnish. Compared with the prior art, the color varnish is used for a semitransparent layer for repairing an automobile in three working procedures, provides chroma and permeability, and does not cover metal texture. The varnish comprises the following components in percentage by weight: curing agent: diluent=2:1:0.5, after the conventional treatment is carried out on the local defect part of the automobile coating, spraying a base color layer formed by mixing aluminum powder and color master batch, drying, carrying out medium wet spraying on the color varnish for one half, leveling for 5 minutes, and then spraying the common varnish for 1-2 times. Compared with the prior art, the color varnish has high chroma and transparency, uniform and stable pigment, good color rendering and plumpness, and can obviously improve the chroma of the metallic base color. However, if inorganic pigments of different colors are added to the formulation, the storage stability, appearance, etc. of the product may be deteriorated. That is, the formulation is not generally used for color varnishes of different colors.

Disclosure of Invention

Based on the above facts, the present invention aims to provide a color varnish, a preparation method and application thereof. The color varnish can provide the varnish with different colors according to actual needs. Namely, the color varnish is generally used for different colors, is suitable for matching with the existing color paints with various colors, can effectively reduce the tarnish and chroma, and has the characteristics of good appearance and high storage stability.

In one aspect, the invention provides a color varnish, which comprises the following components in parts by weight:

wherein the acrylic resin consists of 4-6 parts of acrylic resin A with the boiling point of 120-150 ℃, 25-30 parts of acrylic resin B with the boiling point of 130-180 ℃, the acid value of 57-67mg KON/g, the number average molecular weight of 1500-2500, the weight average molecular weight of 2500-3500, and acrylic resin C with the boiling point of 140-165 ℃, the epoxy equivalent of 350-450, the number average molecular weight of 2500-3000 and the weight average molecular weight of 5000-6000; and acrylic resin a, acrylic resin B, and acrylic resin C are different from each other.

In the technical scheme of the invention, the acrylic resin A can play a role in interface control; the acrylic resin B can play a role in delaying the n-butyl alcohol block reaction and improving the acid rain resistance; the acrylic resin C may play a role in adjusting the appearance.

Alternatively, the acrylic resin A is selected from PZS-1030GZ, the acrylic resin B is selected from ACS-1218, and the acrylic resin C is selected from ACS-1211.

Optionally, the polyester resin is an oligomer containing carboxylic acid; the polyester resin has a boiling point of 140-165 ℃, a hydroxyl value of 430-480mg KON/g, a number average molecular weight of 2400-2600 and a weight average molecular weight of 3000-3300. The fineness of the polyester resin is preferably 5 μm or less.

Optionally, the polyester resin is selected from PRS-1014.

Optionally, the wetting dispersant is a high molecular block acrylic copolymer containing pigment affinic groups.

Optionally, the wetting dispersant is selected from BYK 161. The flash point of the dispersing agent is 38 ℃, the amine value of the dispersing agent is 11mg KON/g, the dispersing agent has wetting and dispersing properties with superfine toner, and the dispersing agent has strong stability to products.

Optionally, the solvent comprises:

5-6 parts of dibasic acid ester;

9-12 parts of aromatic hydrocarbon S-100;

1-2 parts of methanol;

0.1-1 part of 3-ethoxypropionic acid ethyl ester.

In the technical scheme, the solvent dibasic ester, aromatic hydrocarbon and 3-ethoxypropionic acid ethyl ester can well dissolve ultraviolet absorbent and the like. The methanol can well adjust the resistance value and improve the stability of the product.

Optionally, the leveling agent comprises:

0.001-0.01 part of organic silicon flatting agent;

0.1-1 part of acrylic leveling agent.

In yet another aspect, the present invention provides a method of preparing a color varnish. The method comprises the following steps:

adding wetting dispersant and partial solvent into a device filled with polyester resin under the condition of stirring, and uniformly mixing;

continuously adding inorganic pigment under the condition of stirring, and uniformly mixing to obtain a mixture A;

sand milling until the fineness of the mixture A is less than or equal to 5, wherein the sand milling temperature is below 40 ℃;

adding a mixture B mixed with another part of solvent, acrylic resin A and acrylic resin B into the mixture A under the stirring condition, and uniformly mixing;

adding acrylic resin C under stirring, mixing, adding leveling agent, ultraviolet absorbent and acrylic dispersing agent, and mixing;

and regulating the resistance value and the viscosity to obtain the color varnish.

In yet another aspect, the present invention provides a use of a color varnish in automotive coating.

The beneficial effects of the invention are as follows:

according to the color varnish provided by the invention, the inorganic pigment is creatively introduced into the varnish formula, and the volatilization speed of the solvent is improved and the mutual movement of the interfacial solvents between layers is reduced by further adjusting the composition of the formula, so that the pigment can be effectively and uniformly distributed without affecting other performance indexes of the varnish, and the tarnish degree is reduced. In addition, the varnish formula is suitable for inorganic pigments with various colors, has good chroma and permeability, does not mask metal texture, and has the characteristics of good appearance and high storage stability.

Detailed Description

In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.

In the following examples and comparative examples, the unit of the raw material amount is parts unless otherwise specified.

Example 1

A white varnish having a composition shown in Table 1 below.

The preparation of the white varnish comprises the following steps:

A. PRS-1014 is put into a main cylinder to confirm that the fineness is less than or equal to 5 microns;

b.200-300rpm, stirring and adding BYK 161, DBE and arene S-100, stirring for 30 min;

C. adding the toner under stirring at 300-400rpm, and stirring for 30 minutes;

D. then sand grinding is carried out, the sand grinding temperature cannot exceed 40 ℃, and the fineness is confirmed to be less than or equal to 5;

the aromatic hydrocarbon S-100 is cleaned on the cylinder wall, the yield is calculated, the corresponding amount of E is added under stirring at 300-400rpm,

E. adding 3-ethoxypropionic acid ethyl ester into the auxiliary cylinder, adding PZS-1030GZ under stirring,

stirring at 300-400rpm for 10 min, adding ACS-1218, and stirring at 300-400rpm for 10 min;

adding ACS-1211 under stirring at 300-400rpm, and stirring at 300-400rpm for 10 min;

G. adding D OWSIL under stirring ^TM 8637ADDITIVE is stirred for 15min;

H. adding DISPARLON OX-881 under stirring at 300-400 rpm;

I. adding TINUVIN 123 under stirring at 400-600 rpm;

J. adding DISPARLON OX-6140 under stirring at 400-600 rpm;

K. regulating the resistance value of the paint by using methanol, and regulating the viscosity to a qualified range by using aromatic hydrocarbon S-100;

( Note that: the addition should be carried out in small portions and stirring should be carried out for 15 minutes and at 300-600rpm for each measurement. )

TABLE 1

Comparative example 1

The formulation of the varnish of comparative example 1 is shown in Table 1 above, and the preparation method is the same as that of example 1, except that some components are added in different amounts, and BYK 161 is not added, TIPAQUE CR-97 (25 kg) is not added.

The properties of the varnishes obtained in example 1 and comparative example 1 are shown in table 2 below.

Note that: composition of the paint film formed: performance plate OP-30 is coated with (30-40 μm) +AR2000 white paint (15-20 μm) +varnish (30-40 μm).

As can be seen from table 2, the film of this example was less tarnish than that of the comparative example and had a better appearance.

TABLE 2

Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp treatment of the coating films obtained in example 1 and comparative example 1 are shown in table 3 below.

TABLE 3 Table 3

Example 2

A purple varnish having the composition shown in Table 4 below.

The varnish was prepared in the same manner as in example 1.

TABLE 4 Table 4

Comparative example 2

The formulation of the varnish of comparative example 2 is shown in table 4 above, and the preparation method is the same as that of example 2, except that some components are added in different amounts, and that BYK 161 is not added and CINQUASIA MAGENTA L4530 is not added.

The properties of the varnishes obtained in example 2 and comparative example 2 are shown in table 5 below.

Note that: composition of the paint film formed: the performance board OP-30 is coated with (30-40 μm) +AR2000 purple top coat (15-20 μm) +varnish (30-40 μm).

TABLE 5

Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 2 and comparative example 2 are shown in table 6 below.

TABLE 6

Example 3

A bright red varnish having the composition shown in Table 7 below.

The varnish was prepared in the same manner as in example 1.

TABLE 7

Comparative example 3

The formulation of the varnish of comparative example 3 is shown in Table 7 above, and the preparation method is the same as that of example 3, except that some components are added in different amounts, BYK 161 is not added, and BAYFERROX 120NM is not added.

The properties of the varnishes obtained in example 3 and comparative example 3 are shown in table 8 below.

Note that: composition of the paint film formed: performance board OP-30 is coated with (30-40 μm) +AR2000 red top coat (15-20 μm) +varnish (30-40 μm).

TABLE 8

Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 3 and comparative example 3 are shown in table 9 below.

TABLE 9

Example 4

A yellow varnish having a composition shown in table 10 below.

The preparation of the varnish is shown in example 1.

Table 10

Comparative example 4

The formulation OF the varnish OF comparative example 4 is shown in Table 10 above, and the preparation method is the same as that OF example 4, except that the addition amounts OF some components are different, BYK 161 is not added, and BAYFAST YELLOW Y5688/OF is not added.

The properties of the varnishes obtained in example 4 and comparative example 4 described above are shown in table 11 below.

Note that: composition of the paint film formed: the performance board OP-30 is coated with (30-40 μm) +AR2000 Huang Mianqi (15-20 μm) +varnish (30-40 μm).

TABLE 11

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Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 4 and comparative example 4 are shown in table 12 below.

Table 12

Example 5

A black varnish having the composition shown in table 13 below.

The varnish was prepared in the same manner as in example 1.

TABLE 13

Comparative example 5

The formulation of the varnish of comparative example 5 is shown in Table 13 above, and the preparation method is the same as that of example 5, except that the addition amounts of some components are different, BYK 161 is not added, and Raven L Powder is not added.

The properties of the varnishes obtained in example 5 and comparative example 5 are shown in table 14 below.

Note that: composition of the paint film formed: performance plate OP-30 is coated with (30-40 μm) +AR2000 black top coat (15-20 μm) +varnish (30-40 μm).

TABLE 14

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Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 5 and comparative example 5 are shown in table 15 below.

TABLE 15

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Example 6

A blue varnish having the composition shown in table 16 below.

The varnish was prepared in the same manner as in example 1.

Table 16

Comparative example 6

The formulation of the varnish of comparative example 6 is shown in Table 16 above, and the preparation method is the same as that of example 6, except that some components are added in different amounts, and BYK 161 is not added, and CYANINE BLUE G-314 is not added.

The properties of the varnishes obtained in example 6 and comparative example 6 described above are shown in Table 17 below.

Note that: composition of the paint film formed: performance plate OP-30 is coated with (30-40 μm) +AR2000 blue top coat (15-20 μm) +varnish (30-40 μm).

TABLE 17

Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 6 and comparative example 6 are shown in table 18 below.

TABLE 18

Example 7

A green varnish having the composition shown in table 19 below. The varnish was prepared in the same manner as in example 1.

TABLE 19

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Comparative example 7

The formulation of the varnish of comparative example 7 is shown in Table 19 above, and the preparation method is the same as that of example 7 except that the addition amounts of some components are different, BYK 161 is not added, LIONOL GREEN JF-8664 is not added.

The properties of the varnishes obtained in example 7 and comparative example 7 are shown in table 20 below.

Note that: composition of the paint film formed: performance board OP-30 is coated with (30-40 μm) +AR2000 green top coat (15-20 μm) +varnish (30-40 μm).

Table 20

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Xenon lamp accelerated weathering adhesion test method using TSH1585G 3.3C coating films the appearance properties after 2000 hours of xenon lamp for the coating films obtained in example 7 and comparative example 7 are shown in table 21 below.

Table 21

Comparative example 8

Example 1 was repeated except that acrylic resin PZS-1030GZ was not added, and the addition amount of acrylic resin ACS-1218 was changed to 31.71 parts, with the remaining conditions unchanged.

The properties of the varnish obtained in comparative example 8 described above are shown in table 22 below.

Note that: composition of the paint film formed: performance plate OP-30 is coated with (30-40 μm) +AR2000 white paint (15-20 μm) +varnish (30-40 μm).

Table 22

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Conclusion: as is clear from the above table, the paint film obtained in comparative example 8 was inferior in tarnish, storage stability and appearance to the effects of example 1. Since the aforementioned properties are deteriorated, the weather resistance is naturally deteriorated, and no further weather resistance test is required.

Comparative example 9

Example 1 was repeated except that no acrylic resin ACS-1218 was added, and the addition amount of acrylic resin PZS-1030GZ was changed to 31.71 parts, with the remaining conditions unchanged.

The properties of the varnish obtained in comparative example 9 are shown in Table 23 below.

Note that: composition of the paint film formed: performance plate OP-30 middle coating (30-40 μm) +AR2000 white paint (15-20 μm) +varnish (30-40 μm)

Table 23

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Conclusion: as is clear from the above table, the paint film obtained in comparative example 9 was inferior in solids and viscosity, increased in hardness, reduced in impact, tarnish, storage stability and appearance to those of example 1. Since the aforementioned properties are deteriorated, the weather resistance is naturally deteriorated, and no further weather resistance test is required.

Comparative example 10

Example 1 was repeated except that no acrylic resin ACS-1211 was added, and the addition amount of acrylic resin ACS-1218 was changed to 58.72 parts, with the remaining conditions unchanged.

The properties of the varnish obtained in comparative example 10 described above are shown in table 24 below.

Note that: composition of the paint film formed: performance plate OP-30 middle coating (30-40 μm) +AR2000 white paint (15-20 μm) +varnish (30-40 μm)

Table 24

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Conclusion: as is clear from the above table, the paint film obtained in comparative example 10 was reduced in solids content, reduced in impact, tarnish, storage stability and appearance, as compared with the effect of example 1. Since the aforementioned properties are deteriorated, the weather resistance is naturally deteriorated, and no further weather resistance test is required.

Comparative example 11

Example 1 was repeated except that the polyester resin PRS-1014 was replaced with a PRS 1022 (NPZ) polyester resin. Wherein the PRS 1022 (NPZ) polyester resin has a boiling point of 170-185 ℃, a hydroxyl value of 550-650mg KON/g, a number average molecular weight of 4000-5300 and a weight average molecular weight of 6000-6500.

The properties of the varnishes obtained in example 1 and comparative example 11 are shown in table 25 below.

Note that: composition of the paint film formed: performance plate OP-30 is coated with (30-40 μm) +AR2000 white paint (15-20 μm) +varnish (30-40 μm).

Table 25

Conclusion: as is clear from the above table, the paint film obtained in comparative example 11 was reduced in gloss, tarnish, storage stability and appearance, as compared with the effect of example 1. Since the aforementioned properties are deteriorated, the weather resistance is naturally deteriorated, and no further weather resistance test is required.

As is apparent from the above examples and comparative examples as a whole, the varnishes in the present application can be applied to various inorganic pigments, and the resulting varnish film is low in tarnish and astringency, and has good appearance and stability.

It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims (10)

1. The color varnish is characterized by comprising the following components in parts by weight:

9-11 parts of polyester resin;

1.5-2 parts of wetting dispersant;

15.1-21 parts of solvent;

4-5 parts of inorganic pigment;

0.101-1.01 parts of leveling agent;

0.5-2 parts of ultraviolet absorber;

0.1-1 part of acrylic dispersing agent;

an acrylic resin;

wherein the acrylic resin consists of 4-6 parts of acrylic resin A with the boiling point of 120-150 ℃, 25-30 parts of acrylic resin B with the boiling point of 130-180 ℃, the acid value of 57-67mg KON/g, the number average molecular weight of 1500-2500, the weight average molecular weight of 2500-3500, 30-40 parts of acrylic resin C with the boiling point of 140-165 ℃, the epoxy equivalent of 350-450, the number average molecular weight of 2500-3000 and the weight average molecular weight of 5000-6000; and acrylic resin a, acrylic resin B, and acrylic resin C are different from each other.

2. The colored varnish of claim 1, wherein the acrylic resin a is selected from PZS-1030GZ, the acrylic resin B is selected from ACS-1218, and the acrylic resin C is selected from ACS-1211.

3. The color varnish of claim 1, wherein the polyester resin is an oligomer containing carboxylic acid; the polyester resin has a boiling point of 140-165 ℃, a hydroxyl value of 430-480mg KON/g, a number average molecular weight of 2400-2600 and a weight average molecular weight of 3000-3300.

4. A color varnish according to claim 3, wherein the polyester resin is selected from PRS-1014.

5. The colored varnish according to claim 1, wherein the wetting dispersant is a high molecular block acrylic copolymer containing a pigment affinic group.

6. The color varnish of claim 5, wherein the wetting dispersant is selected from the group consisting of BYK 161.

7. The color varnish of claim 1, wherein the solvent comprises:

5-6 parts of dibasic acid ester;

9-12 parts of aromatic hydrocarbon S-100;

1-2 parts of methanol;

0.1-1 part of 3-ethoxypropionic acid ethyl ester.

8. The color varnish according to claim 1, wherein the leveling agent comprises:

0.001-0.01 part of organic silicon flatting agent;

0.1-1 part of acrylic leveling agent.

9. The process for preparing a color varnish as claimed in any one of claims 1 to 8, comprising the steps of:

adding wetting dispersant and partial solvent into a device filled with polyester resin under the condition of stirring, and uniformly mixing;

continuously adding inorganic pigment under the condition of stirring, and uniformly mixing to obtain a mixture A;

sand milling until the fineness of the mixture A is less than or equal to 5, wherein the sand milling temperature is below 40 ℃;

adding a mixture B mixed with another part of solvent, acrylic resin A and acrylic resin B into the mixture A under the stirring condition, and uniformly mixing;

adding acrylic resin C under stirring, mixing, adding leveling agent, ultraviolet absorbent and acrylic dispersing agent, and mixing;

and regulating the resistance value and the viscosity to obtain the color varnish.

10. Use of a color varnish according to any one of claims 1 to 8 in automotive coating.