A sanding-free toning color paste, its preparation method and application

Abstract

The application discloses a sanding-free toning color paste and a preparation method and application thereof. According to mass percentage, the raw materials for forming the toning color paste comprise 50-65% of polyester resin, 15-25% of pigment color sheet and 10-35% of solvent; and the toning color paste is obtained by stirring the raw materials. According to the toning color paste, the sanding-free step is not needed in the preparation process of the toning color paste by controlling the raw material formula and adjusting the preparation method, and the toning color paste has good fluidity, wet film appearance, paint film appearance, temperature resistance and storage stability.

Description

Technical Field

[0001] This invention relates to the field of color paste technology. More specifically, it relates to a non-grinding color paste, its preparation method, and its application. Background Technology

[0002] Pigment chips, as a type of Class C solid material, are VOC-free, making leaks easy to clean and less likely to generate contaminating hazardous waste. This reduces various problems caused by solvent-based coatings during storage and transportation. In the production of coatings and inks, the goal of every company's research and development is to simplify production steps, reduce the storage and transportation of solvent-based coatings, and obtain reproducible pigments with high color strength and high quality.

[0003] Currently, in the field of pigment use, solid pigment particles have effectively solved problems such as unstable performance, color concentration differences, and time-consuming grinding. They can be easily dispersed in coatings simply by stirring. With the emergence of pigment particles and the industrialization of surface treatment, coupled with the development of new dispersants and advancements in dispersing machines, pigment dispersion has become much easier than before. Furthermore, the dust pollution caused by the scattering of powdered pigments is certainly not a good thing from a working environment perspective. Therefore, through methods such as beading, granulation, flake formation, and the addition of anti-scattering agents, non-scatterable and easily measured pigments have become widespread. This is also the driving force behind the survival and development of pigment particles. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a sand-free color paste, its preparation method and application.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On the one hand, the present invention provides a non-grinding color paste, wherein the raw materials forming the color paste, by weight percentage, contain: 50-65% polyester resin, 15-25% pigment chips and 10-35% solvent.

[0007] The colorant paste is obtained by stirring the raw materials.

[0008] Furthermore, the number-average molecular weight of the polyester resin is 1000-5500.

[0009] Furthermore, the type of the polyester resin is selected from... LH 828-24 LH538-02 One or more of LH 820-04N.

[0010] Furthermore, the pigment flakes are one or more of the following: round pigment flakes with a particle size of 0.5-2 cm, pointed pigment flakes with a length of 1-3 cm, and blocky pigment flakes with an average particle size of 1-2 cm.

[0011] Furthermore, the solvent is an organic solvent.

[0012] Furthermore, the solvent is selected from one or more of propylene glycol methyl ether acetate, ethylene glycol monobutyl ether, S100 solvent oil, and S150 solvent oil.

[0013] Furthermore, the solvent is a mixture of propylene glycol methyl ether acetate, S100 solvent oil and S150 solvent oil in a mass ratio of 3:4:3.

[0014] Furthermore, the mixing equipment used is one or more of the following: a slanted blade impeller, a disc turbine impeller, a frame impeller, and a straight blade impeller.

[0015] Furthermore, the stirring speed is 600-800 r / min, and the diameter of the stirring plate or paddle is 500 mm.

[0016] On another aspect, the present invention provides a method for preparing a non-grinding color paste as described above, wherein the preparation process of the color paste does not require grinding. Specifically, the method for preparing the color paste includes the following steps:

[0017] Mix the raw materials and stir evenly to obtain the color paste.

[0018] Furthermore, the equipment used for stirring is one or more of the following: a slanted blade impeller, a disc turbine impeller, a frame impeller, and a straight blade impeller.

[0019] Furthermore, the stirring time is 1-5 hours.

[0020] In another aspect, the present invention provides a coating comprising the sand-free colorant paste as described above.

[0021] On another front, the present invention provides the application of the above-described sand-free color paste in the preparation of coatings.

[0022] The beneficial effects of this invention are as follows:

[0023] The color paste provided by this invention, through the control of its raw material formula and the adjustment of its preparation method, eliminates the need for a sand milling step in the preparation process, and the color paste has good fluidity, wet film appearance, paint film appearance, temperature resistance and storage stability. Detailed Implementation

[0024] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0025] In the coil coating industry, pigment pastes prepared by sand milling are generally used for coloring. However, these sand-milled pigment pastes have poor storage stability and are difficult to schedule production flexibly. In order to improve the storage stability of the sand-milled pigment pastes, increase the production efficiency of the pigment pastes, improve the scheduling flexibility, and reduce VOCs, a specific embodiment of the present invention provides a sand-mill-free color paste. The raw materials forming the color paste, by weight percentage, contain: 50-65% polyester resin, 15-25% pigment flakes, and 10-35% solvent.

[0026] The colorant paste is obtained by stirring the raw materials.

[0027] It is understood that the color paste in this embodiment is not prepared by sand milling. That is, there is no sand milling step in the preparation process of this color paste.

[0028] The color paste provided by this embodiment has good fluidity, wet film appearance, paint film appearance, temperature resistance and storage stability.

[0029] In some examples, the number-average molecular weight of the polyester resin is 1000-5500. In some specific examples, the number-average molecular weight of the polyester resin includes, but is not limited to, 1000-2500, 2500-4000, 4000-5500, etc., and most preferably, the number-average molecular weight of the polyester resin is 1000-2500. By controlling the molecular weight of the polyester resin, the resulting color paste exhibits better stability and T-bend performance.

[0030] In some examples, the type of the polyester resin is selected from... LH 828-24 LH 538-02 One or more of LH 820-04N.

[0031] In some examples, the pigment swatches are CAB swatches.

[0032] In some examples, the pigment flakes are one or more of the following: round pigment flakes with a particle size of 0.5-2 cm, pointed pigment flakes with a length of 1-3 cm, and blocky pigment flakes with an average particle size of 1-2 cm. Preferably, the pigment flakes are round pigment flakes with a particle size of 0.5-2 cm, in which case the prepared pigment paste has excellent stability, especially fineness stability.

[0033] In some examples, the solvent is an organic solvent.

[0034] In some examples, the solvent is selected from one or more of propylene glycol methyl ether acetate, ethylene glycol monobutyl ether, S100 solvent oil, and S150 solvent oil.

[0035] In some examples, the solvent is a mixture of propylene glycol methyl ether acetate, S100 solvent oil, and S150 solvent oil in a mass ratio of 3:4:3. Under these conditions, the stability of the color paste can be improved more effectively.

[0036] In some examples, the stirring device is one or more of the following: a slanted blade impeller, a disc turbine impeller, a frame impeller, and a straight blade impeller. A slanted blade impeller is preferred, as this results in a finer particle size and better stability of the dispersed pigment.

[0037] In some examples, the stirring speed is 600-800 r / min, and the diameter of the stirring pan or paddle is 500 mm. Under these conditions, a more uniformly dispersed and more stable color paste can be obtained.

[0038] According to another specific embodiment of the present invention, a method for preparing a non-grinding color paste as described above is provided. The preparation process of the color paste does not require grinding. Specifically, the method for preparing the color paste includes the following steps:

[0039] Mix the raw materials and stir evenly to obtain the color paste.

[0040] In some examples, the mixing equipment used is one or more of the following: a slanted blade impeller, a disc turbine impeller, a frame impeller, and a straight blade impeller.

[0041] In some examples, the stirring time is 1-5 hours.

[0042] According to another specific embodiment of the present invention, the present invention provides a coating comprising the sand-free colorant paste as described above.

[0043] According to another specific embodiment of the present invention, the present invention provides the application of the above-described sand-free color paste in the preparation of coatings.

[0044] In this embodiment, during the preparation of the coating, the amount of tinting paste added is basically the same as that added by tinting paste obtained by sand milling.

[0045] In some examples, the amount of the tinting paste relative to the paint raw material is 1-2 wt%, preferably 1.2 wt%.

[0046] The technical solution of the present invention will be described below with reference to some specific embodiments:

[0047] Example 1

[0048] A non-grinding color paste, wherein the color paste is made from the following raw materials in parts by weight: 60 parts polyester resin, 22 parts pigment chips, and 18 parts solvent. The color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0049] The polyester resin is a polyester resin with a number average molecular weight of 1000-2500. LH 828-24;

[0050] The pigment chips are circular CAB pigment chips with a particle size of 0.5-2 cm;

[0051] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%) and S150 solvent oil (30 wt%).

[0052] The mixing equipment used is a slanted blade impeller mixer.

[0053] The preparation method of the color paste includes the following steps:

[0054] Polyester resin, pigment chips, and solvent are added to an inclined blade impeller (500 mm in diameter) and mixed at a speed of 600-800 r / min. The mixture is obtained by dispersing for 1 h, 3 h, and 5 h.

[0055] Example 2

[0056] A non-grinding color paste, wherein the color paste is made from the following raw materials in parts by weight: 65 parts polyester resin, 18 parts pigment chips, and 17 parts solvent. The color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0057] The polyester resin is a polyester resin with a number average molecular weight of 2500-4000. LH 538-02;

[0058] The pigment chips are circular CAB pigment chips with a particle size of 0.5-2 cm;

[0059] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%) and S150 solvent oil (30 wt%).

[0060] The mixing equipment used is a disc turbine mixer.

[0061] The preparation method of the color paste includes the following steps:

[0062] Polyester resin, pigment chips, and solvent are added to a disc turbine mixer (500 mm in diameter) and mixed. The speed is limited to 600-800 r / min. The mixture is obtained by dispersing for 1 h, 3 h, and 5 h.

[0063] Example 3

[0064] A non-grinding color paste, wherein the color paste is made from the following raw materials in parts by weight: 55 parts polyester resin, 23 parts pigment chips, and 22 parts solvent. The color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0065] The polyester resin is a polyester resin with a number average molecular weight of 4000-5500. LH 820-04N;

[0066] The pigment chips are circular CAB pigment chips with a particle size of 0.5-2 cm;

[0067] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%) and S150 solvent oil (30 wt%).

[0068] The mixing equipment used is a frame mixer.

[0069] The preparation method of the color paste includes the following steps:

[0070] Polyester resin, pigment chips, and solvent are added to a frame mixer (500mm diameter impeller) and mixed at a speed of 600-800r / min. The mixture is obtained by dispersing for 1h, 3h, and 5h.

[0071] Example 4

[0072] A non-grinding color paste, wherein the color paste is made from the following raw materials in parts by weight: 48 parts polyester resin, 20 parts pigment chips, and 32 parts solvent. The color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0073] The polyester resin is a polyester resin with a number average molecular weight of 5500-7000. LH 822-01;

[0074] The pre-made pigment chips are circular CAB pigment chips with a particle size of 0.5-2cm;

[0075] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%) and S150 solvent oil (30 wt%).

[0076] The mixing equipment is a straight-blade paddle mixer.

[0077] The preparation method of the color paste includes the following steps:

[0078] Polyester resin, pigment chips, and solvent are added to a straight-blade paddle mixer (500 mm in diameter) and mixed at a speed of 600-800 r / min. The mixture is obtained by dispersing for 1 h, 3 h, and 5 h.

[0079] Example 5

[0080] Repeat Example 1, except that the raw material formula of the color paste is: 65 parts polyester resin, 18 parts pigment chips, and 17 parts solvent, with the other conditions remaining unchanged, to obtain the color paste.

[0081] Example 6

[0082] Repeat Example 1, except that the raw material formula of the color paste is: 55 parts polyester resin, 23 parts pigment chips, and 22 parts solvent, with the other conditions remaining unchanged, to obtain the color paste.

[0083] Example 7

[0084] Repeat Example 1, except that the raw material formula of the color paste is: 48 parts polyester resin, 20 parts pigment chips, and 32 parts solvent, with the other conditions remaining unchanged, to obtain the color paste.

[0085] Example 8

[0086] Example 1 is repeated, except that the number average molecular weight of the resin is 2500-4000. LH

[0087] 538-02), with the rest of the conditions remaining unchanged, to obtain the color paste.

[0088] Example 9

[0089] Example 1 is repeated, except that the number average molecular weight of the resin is 4000-5500. LH

[0090] 820-04N), with other conditions remaining unchanged, to obtain the color paste.

[0091] Example 10

[0092] Example 1 is repeated, except that the number average molecular weight of the resin is 5500-7000. LH

[0093] (822-01), with all other conditions remaining unchanged, to obtain the color paste.

[0094] Example 11

[0095] Repeat Example 1, except that the stirring device is replaced with a disc turbine stirrer, while the other conditions remain the same, to obtain the color paste.

[0096] Example 12

[0097] Repeat Example 1, except that the stirring equipment is replaced with a frame stirrer, while the other conditions remain the same, to obtain the color paste.

[0098] Example 13

[0099] Repeat Example 1, except that the stirring equipment is replaced with a straight-blade paddle mixer, while the other conditions remain the same, to obtain the color paste.

[0100] Comparative Example 1

[0101] A non-grinding color paste, wherein the color paste is made from the following raw materials in parts by weight: 56 parts polyester resin, 19 parts pigment chips, and 25 parts solvent. The color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0102] The polyester resin is a polyester resin with a number average molecular weight of 1000-2500. LH 828-24;

[0103] The pigment swatches are pointed CAB pigment swatches, with a length of 1-3cm;

[0104] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%), and S150 solvent oil (30 wt%).

[0105] The mixing equipment is a straight-blade paddle mixer.

[0106] The preparation method of the color paste includes the following steps:

[0107] Polyester resin, pigment chips, and solvent are added to a straight-blade paddle mixer (500 mm in diameter) and mixed at a speed of 600-800 r / min. The mixture is obtained by dispersing for 1 h, 3 h, and 5 h.

[0108] Comparative Example 2

[0109] A non-grinding color paste, comprising the following raw materials in parts by weight: 63 parts polyester resin, 21 parts pigment chips, and 16 parts solvent, wherein the color paste is obtained by mixing and stirring the components of the raw materials, wherein:

[0110] The polyester resin is a polyester resin with a number average molecular weight of 1000-2500. LH 828-24;

[0111] The pigment chips are block-shaped CAB pigment chips with an average particle size of 1-2 cm.

[0112] The solvent is a mixture of propylene glycol methyl ether acetate (30 wt%), S100 solvent oil (40 wt%) and S150 solvent oil (30 wt%).

[0113] The mixing equipment used is a frame mixer.

[0114] The preparation method of the color paste includes the following steps:

[0115] Polyester resin, pigment chips, and solvent are added to a frame mixer (500mm diameter impeller) and mixed at a speed of 600-800r / min. The mixture is obtained by dispersing for 1h, 3h, and 5h.

[0116] Comparative Example 3

[0117] Repeat Example 1, except that the pigment chips are pointed CAB pigment chips with a length of 1-3 cm, and the other conditions remain the same to obtain the color paste.

[0118] Comparative Example 4

[0119] Repeat Example 1, except that the pigment chips are block-shaped CAB pigment chips with an average particle size of 1-2 cm, and the other conditions remain unchanged to obtain a color paste.

[0120] Coating film preparation:

[0121] The colorant paste described in the examples or comparative examples was used to prepare a coating at a mass percentage of 1.2 wt%. The coating was then applied to a GI steel plate using a 24# wire rod scraper and baked at a plate temperature of 224°C (oven temperature 300°C, chain speed 36.5, wind speed 30 Hz) to obtain a paint film.

[0122] Performance testing methods:

[0123] 1. Inspect the appearance of the paint film according to the method described in JIS K 5600-1-1 4.4.

[0124] 2. Detect fineness according to the method described in JIS K 5600-2-5.

[0125] 3. Detect the density according to the method described in JIS K 5600-2-4.

[0126] 4. Detect viscosity according to the method described in JIS K-5600-2-2 5.

[0127] 5. Test adhesion according to the method described in GB / T13448-201913.

[0128] 6. Test MEK wiping resistance according to the method described in G / T13448-2019 10.

[0129] 7. Test T-bends according to the method described in GE / T13448-2019 7.

[0130] The performance test results are shown in Tables 1-4 below.

[0131] Table 1

[0132]

[0133] Table 2

[0134]

[0135]

[0136] Table 3

[0137]

[0138] Table 4

[0139]

[0140]

[0141] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A non-grinding color paste, characterized in that, The raw materials forming the color paste, by weight percentage, include: 50-65% polyester resin, 15-25% pigment chips and 10-35% solvent. The colorant paste is obtained by stirring the raw materials.

2. The sand-free color paste according to claim 1, characterized in that, The number-average molecular weight of the polyester resin is 1000-5500; Preferably, the type of polyester resin is selected from... LH 828-24 LH 538-02 One or more of LH 820-04N.

3. The sand-free color paste according to claim 1, characterized in that, The pigment flakes are one or more of the following: round pigment flakes with a particle size of 0.5-2cm, pointed pigment flakes with a length of 1-3cm, and blocky pigment flakes with an average particle size of 1-2cm.

4. The sand-free color paste according to claim 1, characterized in that, The solvent is an organic solvent; Preferably, the solvent is selected from one or more of propylene glycol methyl ether acetate, ethylene glycol monobutyl ether, S100 solvent oil and S150 solvent oil; Preferably, the solvent is a mixture of propylene glycol methyl ether acetate, S100 solvent oil and S150 solvent oil in a mass ratio of 3:4:

3.

5. The sand-free color paste according to claim 1, characterized in that, The mixing equipment used is one or more of the following: inclined blade impeller, disc turbine impeller, frame impeller, and straight blade impeller. Preferably, the stirring speed is 600-800 r / min, and the diameter of the stirring plate or paddle is 500 mm.

6. The method for preparing the sand-free color paste according to claims 1-5, characterized in that, The preparation process of the color paste does not require grinding. Specifically, the preparation method of the color paste includes the following steps: Mix the raw materials and stir evenly to obtain the color paste.

7. The preparation method according to claim 6, characterized in that, The equipment used for mixing is one or more of the following: inclined blade impeller, disc turbine impeller, frame impeller, and straight blade impeller.

8. The preparation method according to claim 6, characterized in that, The stirring time is 1-5 hours.

9. A coating, characterized in that, It contains a color paste that does not require grinding, as described in any one of claims 1-5.

10. The application of the sand-free color paste as described in any one of claims 1-5 in the preparation of coatings.

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