A transparent primer capable of being baked at low temperature and its use method
Through the combination of alkyd resin, amino resin and epoxy resin, p-toluenesulfonic acid and butyl acetate, n-butanol and ethyl acetate solvents, the paint disease problem of paint in tropical high temperature and high humidity environments is solved, and rapid drying and high adhesion are achieved, which is suitable for paint needs in Southeast Asia.
Patent Information
- Application Number
- CN202311079770.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-25
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2043-08-25
AI Technical Summary
Existing paints are prone to paint diseases in tropical high-temperature and high humidity environments such as Southeast Asia, which have slow drying time and are difficult to meet the needs.
Using a combination of alkyd resin, amino resin and epoxy resin, combined with p-toluenesulfonic acid and butyl acetate, n-butanol and ethyl acetate solvents, the paint film is blended with flexibility and enhanced adhesion, and the low-temperature baking and rapid drying is achieved.
Rapid drying is achieved at low temperatures, improving high temperature, high humidity resistance and adhesion, reducing odor, and meeting the construction needs of tropical regions such as Southeast Asia.
Smart Images
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Figure BDA0004413899550000042
Abstract
Description
Technical Field
[0001] The invention belongs to the field of coatings, and in particular relates to a transparent primer capable of being baked at low temperature and a use method thereof. Background Art
[0002] With the development of Southeast Asian countries, demand for Chinese chemical products is growing rapidly. my country's exports of various types of paint to Southeast Asia have maintained a rapid growth trend. However, due to the tropical climate in Southeast Asia, conventional polyurethane paints are prone to paint defects in high temperature and high humidity. They also have slow drying times, resulting in long sanding intervals and difficult application. Nitrocellulose lacquer adhesion also fails to meet customer performance requirements. Therefore, the development of primers that can withstand high temperature and high humidity environments, dry quickly, are easy to sand, and have high adhesion is a new development direction for the industry. Summary of the Invention
[0003] In order to enhance the high temperature resistance, high humidity resistance and adhesion of the primer and to increase the drying speed of the paint, the present invention provides a transparent primer that can be baked at a low temperature and a method for using the same.
[0004] According to one aspect of the present invention, a low-temperature bakeable transparent primer is provided. Raw materials for preparing the transparent primer include component A and component B. Calculated by weight, the raw materials for preparing component A include 25 to 30 parts of alkyd resin, 38 to 46 parts of amino resin, 1 to 4 parts of epoxy resin, 4 to 7 parts of butyl acetate, 3 to 6 parts of n-butanol, and 4 to 8 parts of ethyl acetate; and the raw materials for preparing component B include 23 to 28 parts of p-toluenesulfonic acid.
[0005] The transparent primer provided by the present invention utilizes the excess energy after the reaction of p-toluenesulfonic acid and amino resin to accelerate the oxidation film formation of alkyd resin, adjust the flexibility of the paint film, and then utilize epoxy resin to enhance the adhesion of the paint film, and synergize with alkyd resin and amino resin to enhance the high temperature and high humidity resistance of the paint film. Furthermore, by combining three solvents of butyl acetate, n-butanol, and ethyl acetate, the drying speed of the paint film is synergistically increased, and rapid drying at low temperatures can be achieved. Therefore, compared with similar coating products of the acid-cured transparent primer made from ordinary alkyd resin currently used in the market, the transparent primer provided by the present invention has good high temperature resistance, high humidity resistance, adhesion, and a faster paint drying speed.
[0006] Preferably, the ratio of alkyd resin to p-toluenesulfonic acid is 15 to 18:1.
[0007] Preferably, calculated by weight, component B further comprises 8 to 86 parts of a solvent, wherein the solvent comprises at least one of ethanol, ethyl acetate, toluene and n-butanol.
[0008] Preferably, calculated by weight, the solvent includes 18 to 22 parts of ethanol, 16 to 20 parts of ethyl acetate, 8 to 12 parts of toluene, and 26 to 32 parts of n-butanol.
[0009] Preferably, in the raw materials for preparing the transparent primer, the mass ratio of component A: component B is 9 to 11:1.
[0010] Preferably, the alkyd resin includes DSM's AN623 / XE alkyd resin, and the amino resin includes Changchun Chemical's 5220-65D amino resin. In the prior art, because cabinets are primarily used to store items such as kitchen utensils and food, users are very sensitive to residual odor from the paint film. Conventional acid-cured paints often produce a strong odor after application. The present invention utilizes the preferred amino and alkyd resins to reduce primer odor, resulting in lower VOC volatility and a deodorizing effect.
[0011] Preferably, the epoxy resin includes 5220-65D amino resin from Changchun Chemical.
[0012] Preferably, the p-toluenesulfonic acid (PTSA) content is 99%.
[0013] Preferably, calculated by weight, component A further comprises 0.2 to 17 parts of an auxiliary agent, wherein the auxiliary agent comprises at least one of a dispersant, talc, an anti-settling agent, and a defoaming agent.
[0014] Preferably, the auxiliary agent includes 0.2 to 0.3 parts of a dispersant, wherein the dispersant includes AFCONA4010 modified polyurethane polymer.
[0015] Preferably, the auxiliary agent includes 8 to 12 parts of talc powder, wherein the talc powder includes Jiatianxia 1250 mesh 908 talc powder.
[0016] Preferably, the auxiliary agent includes 2 to 4 parts of an anti-settling agent, wherein the anti-settling agent includes Disbaron 6900-20 polyamide wax.
[0017] Preferably, the auxiliary agent includes 0.3 to 0.5 parts of a defoaming agent, wherein the defoaming agent includes BYK8800 silicone-free foam-breaking polymer solution.
[0018] Preferably, the method for preparing a transparent primer comprises the following steps: preparing component A: S1. mixing alkyd resin and butyl acetate, and dispersing them at a temperature of 20-30°C for 5-10 minutes to obtain a first reaction liquid; S2. adding n-butanol, amino resin, epoxy resin, and ethyl acetate to the first reaction liquid, and dispersing them at a temperature of 25-35°C for 8-10 minutes to obtain component A; preparing component B: mixing the raw materials for preparing component B at a temperature of 20-30°C to obtain component B; mixing step: mixing component A and component B at a temperature of 20-30°C to obtain a transparent primer.
[0019] Preferably, when preparing component A, in S2, a dispersant, talc, an anti-settling agent, and a defoaming agent are sequentially added to the first reaction liquid, and dispersed at a temperature of 25 to 35° C. for 10 to 15 minutes, followed by adding n-butanol, amino resin, epoxy resin, and ethyl acetate, and continuing to disperse for 8 to 10 minutes at a dispersion speed of 900 to 1100 rpm to obtain component A.
[0020] Preferably, when preparing component A, in S2, the fineness of component A is less than 50 μm.
[0021] According to a second aspect of the present invention, a method for using a transparent primer is provided, the method comprising the following steps: drying the transparent primer as described above at a temperature not higher than 50°C.
[0022] Preferably, the construction thickness of the transparent primer is 50 to 100 mm. DETAILED DESCRIPTION
[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.
[0024] Example 1
[0025] Treatment group 1A
[0026] 1. Preparation of transparent primer material
[0027] This treatment group provides a transparent primer. The raw materials and proportions required for preparing the transparent primer are shown in Table 1. The auxiliary agents used by this treatment group for preparing the transparent primer include the dispersant, talc, anti-settling agent, and defoaming agent mentioned in Table 1.
[0028] Table 1. Raw materials required for preparing transparent primer in this treatment group
[0029]
[0030]
[0031] 2. Method for preparing transparent primer
[0032] Preparation of component A:
[0033] S1. The alkyd resin and butyl acetate were mixed and dispersed at a temperature of 25 ° C for 5 minutes at a dispersion speed of 900 rpm to obtain a first reaction solution;
[0034] S2. Subsequently, a dispersant, talc, an anti-settling agent, and a defoaming agent were sequentially added to the first reaction solution and dispersed at a temperature of 29 ° C for 15 minutes at a dispersion speed of 1200 rpm, and then n-butanol, an amino resin, an epoxy resin, and ethyl acetate were added, followed by dispersion for 10 minutes at a dispersion speed of 1000 rpm to obtain component A;
[0035] Prepare component B: Mix ethanol, ethyl acetate, toluene, n-butanol, and p-toluenesulfonic acid, and disperse at 25°C for 10 minutes at a dispersion speed of 800 rpm.
[0036] Mixing steps: at a temperature of 25° C., mix component A and component B according to a mass ratio of component A: component B = 10:1 to prepare a transparent primer.
[0037] Treatment group 2A
[0038] The raw materials and proportions required for preparing the clear primer in this treatment group are shown in Table 2. The additives used in preparing the clear primer in this treatment group include the dispersant, talc, anti-settling agent, and defoamer listed in Table 2. The required raw materials were prepared in the amounts described in Table 2, and the clear primer was prepared by referring to the steps for preparing the clear primer provided in Treatment Group 1A of Example 1. Aside from the aforementioned formula composition, the steps for preparing the clear primer in this treatment group remained strictly consistent with those in Example 1.
[0039] Table 2. Raw materials required for preparing transparent primer in this treatment group
[0040]
[0041]
[0042] Treatment group 3A
[0043] The raw materials and formulations required for preparing the clear primer in this treatment group are shown in Table 3. The additives used in preparing the clear primer in this treatment group include the dispersant, talc, anti-settling agent, and defoamer listed in Table 3. The required raw materials were prepared in the amounts described in Table 3, and the clear primer was prepared by referring to the steps for preparing the clear primer provided in Treatment Group 1A of Example 1. Aside from the aforementioned formula composition, the steps for preparing the clear primer in this treatment group remained strictly consistent with those in Treatment Group 1A of Example 1.
[0044] Table 3. Raw materials required for preparing transparent primer in this treatment group
[0045]
[0046] Treatment group 4A
[0047] This treatment group prepared a transparent primer according to the formula and method provided in the treatment group 3A of Example 1. Compared with the treatment group 3A of Example 1, this treatment group used an equal mass fraction of ordinary alkyd resin instead of AN623 / XE alkyd resin. Except for the above differences, the operating steps for preparing the transparent primer were strictly consistent with those of the treatment group 3A of Example 1.
[0048] Treatment group 5A
[0049] This treatment group prepared a transparent primer according to the formula and method provided in the treatment group 3A of Example 1. Compared with the treatment group 3A of Example 1, this treatment group used an equal amount of ordinary amino resin to replace the 5220-65D amino resin of Changchun Chemical. Except for the above differences, the operating steps for preparing the transparent primer were strictly consistent with those of the treatment group 3A of Example 1.
[0050] Comparative Example 1
[0051] In this comparative example, a transparent primer was prepared according to the formula and method provided in treatment group 3A of Example 1. Compared with treatment group 3A of Example 1, this comparative example used an equal mass fraction of Changchun Chemical's 5220-65D amino resin instead of alkyd resin in component A. Except for the above differences, the operating steps for preparing the transparent primer were strictly consistent with those of treatment group 3A of Example 1.
[0052] Comparative Example 2
[0053] In this comparative example, a transparent primer was prepared according to the formula and method provided in Treatment Group 3A of Example 1. Compared with Treatment Group 3A of Example 1, an equal amount of AN623 / XE alkyd resin from DSM Chemicals of Italy was used in Component A in this comparative example to replace the amino resin. Except for the above differences, the operating steps for preparing the transparent primer were strictly consistent with those of Treatment Group 3A of Example 1.
[0054] Comparative Example 3
[0055] This comparative example prepares a transparent primer using the formula and method provided in treatment group 3A of Example 1. Compared with treatment group 3A of Example 1, the epoxy resin in component A is replaced by butyl acetate: n-butanol: ethyl acetate in a mass ratio of 7:3:3.4. Except for the above differences, the operating steps for preparing the transparent primer are strictly consistent with those of treatment group 3A of Example 1.
[0056] Comparative Example 4
[0057] In this comparative example, a transparent primer was prepared according to the formula and method provided in treatment group 3A of Example 1. Compared with treatment group 3A of Example 1, this comparative example used an equal mass fraction of ordinary isophorone diisocyanate instead of p-toluenesulfonic acid in component B. Except for the above differences, the operating steps for preparing the transparent primer were strictly consistent with those of treatment group 3A of Example 1.
[0058] Test Example 1
[0059] 1. Test subjects
[0060] The transparent primers prepared by treatment groups 1A to 5A of Example 1 and comparative examples 1 to 4.
[0061] 2. Test Method
[0062] Tested according to Q / MTS 025-2022, the enterprise standard for solvent-based acid-curing (AC) wood coatings.
[0063] Among them, the transparency of the transparent primer is determined by GB / T 1721-1979 Varnishes, oils and thinners, determination of appearance and transparency, where transparent is 82-100, slightly hazy is 52-81, and turbid is below 51; the flexibility of the transparent paint film is tested by the tinplate method.
[0064] 3. Test results and analysis
[0065] The test results of this test example are shown in Table 4. This test example mainly explores the impact of changes in the formula in the transparent primer on its performance. Among them, in Comparative Example 1, no alkyd resin was used to prepare the transparent primer, which resulted in a decrease in the flexibility, high temperature resistance and water resistance of the corresponding transparent primer. Similarly, in Comparative Example 2, no amino resin was used to prepare the transparent primer, and the drying speed of the transparent primer obtained was significantly reduced and the transparency was reduced. In Comparative Example 3, the adhesion of the transparent primer was significantly reduced due to the use of solvent instead of epoxy resin. In Comparative Example 4, since p-toluenesulfonic acid was not added to component B, although the curing agent isophorone diisocyanate was also added, the performance of the transparent primer still declined significantly, especially the drying speed of the transparent primer.
[0066] In Example 1, treatment groups 1A to 3A showed some fluctuations in the performance of the clearcoat, but they remained at a good level. In contrast, the use of conventional alkyd and amino resins in treatment groups 4A to 5A resulted in a strong odor and increased VOC levels in the resulting clearcoat. Of the treatment groups 1A to 5A in Example 1, the clearcoat produced in treatment group 3A exhibited the best overall performance.
[0067] Table 4. Test results of treatment groups 1A to 5A in Test Example 1
[0068]
[0069] Table 5. Test results of Comparative Examples 1 to 4 of Test Example 1
[0070] Test items Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 VOC,% 65 70 75 62 transparency transparent turbid turbid transparent Dry (25℃) 12h 16h 16h 6h Dry (50℃) 4h 6h 6h 4h flexibility Φ5 Φ6 Φ7 Φ4 Adhesion Level 3 Level 3 Level 3 Level 1 High temperature resistance Level 3 Level 3 Level 3 Level 2 Water resistance Falls off after 24 hours of immersion in water Falls off after 24 hours of immersion in water No abnormalities No abnormalities coating odor Smell Smell Odorless Odorless
[0071] Example 2
[0072] Treatment group 1B
[0073] This treatment group prepared a transparent primer according to the formula and method provided by treatment group 3A in Example 1.
[0074] Treatment group 2B
[0075] This treatment group prepared a clear primer using the formula and method provided in Treatment Group 1B of Example 2. Unlike Treatment Group 1B of Example 2, this treatment group used a one-pot method. Aside from these differences, the formula for preparing the clear primer in this treatment group remained strictly consistent with that in Treatment Group 1B of Example 2. Specifically, the steps for preparing the clear primer in this treatment group were as follows:
[0076] After preparing the required raw materials according to Table 3 and the mass ratio of component A to component B being 10:1, alkyd resin, butyl acetate, dispersant, talc, anti-settling agent, defoamer, n-butanol, amino resin, epoxy resin, ethanol, ethyl acetate, toluene, and p-toluenesulfonic acid were mixed and put into a dispersion tank. The mixture was dispersed in a disperser at a temperature of 25° C. for 23 minutes at a dispersion speed of 900 rpm to obtain a transparent primer.
[0077] Treatment group 3B
[0078] This treatment group prepared a clear primer using the formula and method provided in Treatment Group 1B of Example 2. Unlike Treatment Group 1B of Example 2, this treatment group added the additives first, followed by the alkyd resin, when preparing the clear primer. Aside from these differences, the formula for preparing the clear primer in this treatment group remained strictly consistent with that in Treatment Group 1B of Example 2. Specifically, the steps for preparing Component A in this treatment group were as follows:
[0079] S1. After preparing the required raw materials according to Table 3, the dispersant, talc, anti-settling agent, defoamer was mixed and put into the dispersion tank, and dispersed with a disperser at a temperature of 25 ° C for 5 minutes at a dispersion speed of 900 rpm to obtain a first reaction solution;
[0080] S2. Subsequently, alkyd resin and butyl acetate were added to the first reaction solution in sequence, and dispersed at a temperature of 29 ° C for 15 minutes at a dispersion speed of 1200 rpm, and then n-butanol, amino resin, epoxy resin, and ethyl acetate were added and dispersed for 10 minutes at a dispersion speed of 1000 rpm to obtain component A;
[0081] The steps for preparing component B and mixing the materials were strictly consistent with those of treatment group 1B in Example 2.
[0082] Treatment group 4B
[0083] This treatment group prepared a clear primer using the formula and method provided in Treatment Group 1B of Example 2. Unlike Treatment Group 1B of Example 2, this treatment group first added the amino resin and epoxy resin before adding the alkyd resin. Aside from these differences, the formula for preparing the clear primer in this treatment group remained strictly consistent with that in Treatment Group 1B of Example 2. Specifically, the steps for preparing the clear primer in this treatment group were as follows:
[0084] S1. After preparing the required raw materials according to Table 3, n-butanol, amino resin, epoxy resin, ethyl acetate were mixed and put into a dispersion tank, and dispersed with a disperser at a temperature of 25 ° C for 5 minutes at a dispersion speed of 900 rpm to obtain a first reaction solution;
[0085] S2. Subsequently, a dispersant, talc, an anti-settling agent, and a defoaming agent were sequentially added to the first reaction solution and dispersed at a temperature of 29 ° C for 15 minutes at a dispersion speed of 1200 rpm, and then alkyd resin and butyl acetate were added and dispersed for 10 minutes at a dispersion speed of 1000 rpm to obtain component A;
[0086] The steps for preparing component B and mixing the materials were strictly consistent with those of treatment group 1B in Example 2.
[0087] Test Example 2
[0088] 1. Test subjects
[0089] The transparent primers prepared in each treatment group of Example 2.
[0090] 2. Test Method
[0091] Follow the test method of Test Example 1.
[0092] 3. Test results and analysis
[0093] The test results of this test example are shown in Table 6. This test example mainly explores the effect of changes in the preparation method on the performance of the transparent primer. In treatment groups 1B to 4B of Example 2, it can be found that due to the change in the operating steps of the preparation method, the performance of the transparent paints prepared by treatment groups 2B to 4B has decreased to varying degrees compared with that of treatment group 1B. For treatment group 2B, due to the addition of components A and B in a one-step process, p-toluenesulfonic acid reacts with the amino resin too early, forming coarse particles, resulting in a decrease in polishability and transparency; for treatment group 3B, adding the additive first and then the alkyd resin for dispersion will result in uneven dispersion, which in turn leads to a decrease in its flexibility; and in treatment group 4B, there is also the problem of uneven dispersion, resulting in a decrease in adhesion. Therefore, among treatment groups 1B to 4B, the transparent primer prepared by treatment group 1B has the best performance.
[0094] Table 6. Test results of test case 2
[0095] Test items Treatment group 1B Treatment group 2B Treatment group 3B Treatment group 4B transparency transparent turbid transparent transparent Dry (25℃) 3.5h 5.5h 4h 4h Dry (50℃) 2h 4h 3h 3h flexibility Φ3 Φ5 Φ7 Φ5 Adhesion Level 1 Level 2 Level 2 Level 3 High temperature resistance Level 1 Level 2 Level 2 Level 2 Water resistance No abnormalities No abnormalities No abnormalities No abnormalities coating odor No residual odor No residual odor No residual odor No residual odor
[0096] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.
Claims
1. A transparent primer capable of low temperature baking, characterized in that: The raw materials for preparing the transparent primer include component A and component B; wherein, calculated by weight, the raw materials for preparing component A include 25 to 30 parts of alkyd resin, 38 to 46 parts of amino resin, 1 to 4 parts of epoxy resin, 4 to 7 parts of butyl acetate, 3 to 6 parts of n-butanol, and 4 to 8 parts of ethyl acetate; the raw materials for preparing component B include 23 to 28 parts of p-toluenesulfonic acid; The method for preparing the transparent primer comprises the following steps: Prepare the A component: S1. The alkyd resin and the butyl acetate are mixed and dispersed at a temperature of 20 to 30 ° C for 5 to 10 minutes to obtain a first reaction solution; S2. adding the n-butanol, the amino resin, the epoxy resin, and the ethyl acetate to the first reaction solution and dispersing the mixture at a temperature of 25 to 35 ° C for 8 to 10 minutes to obtain the component A; Preparing the B component: mixing the raw materials for preparing the B component at a temperature of 20 to 30° C. to obtain the B component; Mixing step: mixing the component A and the component B at a temperature of 20-30° C. to prepare the transparent primer.
2. The transparent primer according to claim 1, wherein The amino resin: the p-toluenesulfonic acid = 15-18:
1.
3. The transparent primer according to claim 1, wherein Calculated by weight, the component B further comprises 8 to 86 parts of a solvent, wherein the solvent comprises at least one of ethanol, ethyl acetate, toluene and n-butanol.
4. The transparent primer according to claim 3, wherein: In the raw materials for preparing the transparent primer, the mass ratio of the component A to the component B is 9 to 11:
1.
5. The transparent primer according to claim 1 or 2, characterized in that: The alkyd resin includes AN623 / XE alkyd resin, and the amino resin includes 5220-65D amino resin produced by Changchun Chemical.
6. The transparent primer according to claim 1, wherein When preparing the A component, in S2, a dispersant, talc, an anti-settling agent, and a defoaming agent are sequentially added to the first reaction liquid, and the mixture is dispersed at a temperature of 25 to 35° C. for 10 to 15 minutes. Then, the n-butanol, the amino resin, the epoxy resin, and the ethyl acetate are added, and the mixture is dispersed for another 8 to 10 minutes to obtain the A component.
7. The transparent primer according to claim 6, wherein: When preparing the A component, in S2, the fineness of the A component is less than 50 μm.
8. A method for using a transparent primer, characterized in that: The method of use comprises the following steps: drying the transparent primer according to any one of claims 1 to 7 at a temperature not higher than 50°C.
9. The method of use according to claim 8, wherein: The construction thickness of the transparent primer is 50 to 100 mm.