A clear finish for household products and a preparation method and application thereof

Abstract

The present application relates to the technical field of light polyurethane varnish, especially to the field of IPC C09D175 / 175, more particularly to a clear finish for home products, a preparation method and application thereof. The components include: A component and B component, the weight ratio between the A component and the B component is 1:(0.3-0.6); the A component, by weight percentage, the raw materials include: 50-70% alkyd resin, 1-15% nitrocellulose, 1-5% polyamide wax, 1-5% additives, 3-8% matting powder, and the first solvent makes up the balance; the B component, by weight percentage, the raw materials include: 50-90% TDI curing agent, 0.1-2% dehydrating agent, and the second solvent makes up the balance. The short oil alkyd resin is used in combination with 3106-B-70 and 33089 from Changxing Chemical Industry, which can effectively solve the problem of large difference between positive and negative gloss in the actual production process.

Description

Technical Field

[0001] This invention relates to the field of photopolymer clear varnish technology, particularly to the field of IPC C09D175, and more specifically, to a clear topcoat for household products, its preparation method, and its application. Background Technology

[0002] Polyurethane paint, also known as polyurethane-based formate paint, features a tough film, water and abrasion resistance, a full gloss, and stable adhesion. Therefore, it is widely used on the surfaces of high-end furniture and wooden products for protection. Currently, with people's increasing demands and appreciation for furniture and wooden doors, more and more types of clear varnishes have emerged to meet market needs and satisfy the requirements of furniture manufacturers for application and customers for desired results. However, existing products cannot effectively solve the problem of consistent gloss on both sides of the surface.

[0003] CN111040591A discloses a one-step resin matting technology to achieve one-step matting of HAA system powder coatings. The raw materials used in this resin matting technology include: high-acid-value semi-crystalline carboxylated polyester resin, random carboxylated polyester resin, hydroxyalkylamide curing agents and additives, and / or pigments and fillers. By utilizing the high-acid-value semi-crystalline carboxylated polyester resin and random carboxylated polyester resin together as film-forming resins and undergoing a crosslinking reaction with the hydroxyalkylamide curing agent, the desired low-gloss effect can be achieved in one step. However, this technical solution has technical defects in practical applications, such as poor gloss sensitivity and coating blooming, and the gloss changes with the coating thickness. Summary of the Invention

[0004] The first aspect of the present invention provides a clear topcoat for household products, comprising, by weight, a component A and a component B, wherein the weight ratio of component A to component B is 1:(0.3-0.6).

[0005] Preferably, the weight ratio of component A to component B is 1:0.5.

[0006] Component A, by weight percentage, comprises: 50-70% alkyd resin, 1-15% nitrocellulose, 1-5% polyamide wax, 1-5% additives, 3-8% matting agent, with the first solvent making up the balance; Component B, by weight percentage, comprises: 50-90% TDI curing agent, 0.1-2% dehydrating agent, with the second solvent making up the balance.

[0007] Preferably, component A, by weight percentage, comprises: 60-70% alkyd resin, 5-15% nitrocellulose, 2-5% polyamide wax, 1-3% additives, 3-6% matting agent, with the first solvent making up the balance; component B, by weight percentage, comprises: 60-90% TDI curing agent, 0.1-1% dehydrating agent, with the second solvent making up the balance.

[0008] Preferably, the weight ratio of alkyd resin to nitrocellulose is (5-8):1.

[0009] More preferably, component A, by weight percentage, comprises: 65% alkyd resin, 10% nitrocellulose, 2% polyamide wax, 2.5% additives, 5% matting agent, with the first solvent making up the balance; component B, by weight percentage, comprises: 70% TDI curing agent, 0.5% dehydrating agent, with the second solvent making up the balance.

[0010] The nitrocellulose is at least one of nitrocellulose 1 / 2 second, nitrocellulose 1 / 4 second, nitrocellulose 1 / 8 second, and nitrocellulose 1 / 16 second.

[0011] Preferably, the nitrocellulose is at least one of nitrocellulose 1 / 4 second and nitrocellulose 1 / 8 second.

[0012] The alkyd resin includes short-oil alkyd resin.

[0013] The alkyd resin has a hydroxyl value of 90-130 mg KOH / g.

[0014] Preferably, the short-oil alkyd resin is selected from at least one of the following: Changxing Chemical 33089, 3807-B-65, 3903-B-70, 34011-TX-70, 3106-B-70, 3106-X-70, 3107-B-70, TP3811 (Top), 3870E65 (Top), AK2178S (Tongde), and AK2179S (Tongde).

[0015] More preferably, the short-oil alkyd resin is selected from at least one of 33089, 3807-B-65, 3903-B-70, 34011-TX-70, 3106-B-70, and 3107-B-70, all of which are purchased from Changxing Chemical.

[0016] More preferably, the short-oil alkyd resin is from Changxing Chemical, with models 3106-B-70 and 33089, and the weight ratio of 3106-B-70 and 33089 is 2:1 to 1:2.

[0017] More preferably, the short-oil alkyd resin is from Changxing Chemical, with models 3106-B-70 and 33089, and the weight ratio of 3106-B-70 and 33089 is 1:1.

[0018] This application research found that the short-oil alkyd resin, manufactured by Changxing Chemical, with models 3106-B-70 and 33089, can effectively solve the problem of large gloss differences between the front and back sides during actual production. In actual production, due to the different evaporation rates and drying conditions on the front and back sides of the substrate, there are large gloss differences. This application unexpectedly discovered that by using the two resins 3106-B-70 and 33089 in combination, especially with a weight ratio of 2:1 to 1:2, this problem can be effectively solved, while also achieving a clean odor effect. This may be because it balances the evaporation rate of the solvent between layers, reducing the gloss differences caused by uneven solvent evaporation. Further research found that 3106-B-70 and 33089 significantly reduce the xylene content, have better compatibility with nitrocellulose, and further improve the transparency and fullness of the matte paint.

[0019] The matting powder is a wax-treated matting powder.

[0020] The polyamide wax was purchased from Shenzhen Yoshida Chemical Co., Ltd., model: 6900-20X.

[0021] Preferably, the matting agent is one or a combination of ED-2, ED-3, C7, C906, MATT3300, MATT3400, and TS-100.

[0022] The additives include dispersants, defoamers, and leveling agents; the weight ratio of the dispersants, defoamers, and leveling agents is 1:(0.01-0.4):(0.01-0.2).

[0023] The type of dispersant used in this invention is not specifically limited. Preferably, the dispersant is selected from at least one of EFKA4010, BYK110, BYK103, and TEGOTwin4100; more preferably, the dispersant is BYK103.

[0024] The type of defoamer described in this invention is not specifically limited. Preferably, the defoamer is selected from at least one of BYK052, BYK066N, BYK141, BYK8800, AC270, AC300, and HX2300; more preferably, the defoamer is BYK141.

[0025] The type of leveling agent described in this invention is not specifically limited. Preferably, the leveling agent is selected from at least one of BYK358N, BYK333, BYK323, TEGO450, and EFKA3777; more preferably, the leveling agent is TEGO450.

[0026] The first solvent includes at least one of cyclohexanone, methyl isobutyl ketone, ethyl acetate, butyl acetate, and butanone.

[0027] Preferably, the first solvent includes cyclohexanone.

[0028] The second solvent includes at least one of butyl acetate, ethyl acetate, dimethyl carbonate, and propylene glycol methyl ether acetate.

[0029] Preferably, the second solvent comprises butyl acetate.

[0030] The TDI curing agent comprises TDI adduct and TDI trimer, wherein the weight ratio of TDI adduct to TDI trimer is (30-50):(20-40).

[0031] Preferably, the TDI curing agent comprises a TDI adduct and a TDI trimer, wherein the weight ratio of the TDI adduct to the TDI trimer is (30-50):(20-30).

[0032] Preferably, the TDI curing agent comprises a TDI adduct and a TDI trimer, wherein the weight ratio of the TDI adduct to the TDI trimer is 40:30.

[0033] Preferably, the TDI curing agent is selected from at least one of L-75, 1451, 1351, 168E, 50E, and 450BA.

[0034] The dehydrating agent is selected from at least one of dehydrating agent 902, dehydrating agent BF-5, and dehydrating agent G-180; preferably, the dehydrating agent is dehydrating agent BF-5 (Bayer).

[0035] The second aspect of the present invention provides a method for preparing a clear topcoat for household products, comprising the following steps: first, adding an additive to alkyd resin and nitrocellulose, mixing evenly, then adding polyamide wax and matting powder and dispersing evenly, adjusting the viscosity with a first solvent to obtain component A; adding a dehydrating agent and TDI curing agent to a second solvent, mixing and stirring evenly to obtain component B, and mixing component A and component B to obtain the final product.

[0036] The third aspect of this invention provides an application of a clear topcoat for home furnishing products, which is applied to furniture, wooden doors, and desks.

[0037] Beneficial effects:

[0038] 1. The short-oil alkyd resin is from Changxing Chemical, and the model is 3106-B-70. It is used in combination with 33089, which can effectively solve the problem of large difference in gloss between the front and back sides in the actual production process.

[0039] 2. The additives include dispersants, defoamers, and leveling agents; the weight ratio of the dispersants, defoamers, and leveling agents is 1:(0.01-0.4):(0.01-0.2), which can improve the wettability of the paint film and the substrate and improve the workability.

[0040] 3. The TDI curing agent comprises TDI adduct and TDI trimer, wherein the weight ratio of TDI adduct to TDI trimer is (30-50):(20-30), and the surface drying time can be controlled to be less than 35 minutes and the actual drying time to be less than 4 hours.

[0041] 4. The weight ratio of alkyd resin to nitrocellulose is (5-8):1, and the nitrocellulose is 1 / 4 second nitrocellulose, which can further reduce the difference in gloss between the front and back to 2-3 degrees, meeting the application requirements of home furnishing products. Attached Figure Description

[0042] Figure 1 The image shows the gloss test results of the front and back sides in Example 1, with the upper part representing the back side.

[0043] Figure 2 The image shows the gloss test results of the front and back sides in Example 2, with the upper part being the front side.

[0044] Figure 3 The image shows the gloss test results of the front and back sides in Example 3, with the upper part representing the back side.

[0045] Figure 4 This is a gloss test image of the front and back sides of Example 4, with the upper part being the back side.

[0046] Figure 5 The image shows the gloss test results of the front and back sides in Example 5, with the upper part being the front side. Detailed Implementation

[0047] Example 1

[0048] A clear topcoat for home products, by weight, comprises: component A and component B, wherein the weight ratio of component A to component B is 1:0.5.

[0049] Component A, by weight percentage, consists of: 65% alkyd resin, 10% nitrocellulose, 2% polyamide wax, 2.5% additives, 5% matting agent, with the first solvent making up the balance; Component B, by weight percentage, consists of: 70% TDI curing agent, 0.5% dehydrating agent, with the second solvent making up the balance.

[0050] The short-oil alkyd resin is from Changxing Chemical, with models 3106-B-70 and 33089, and the weight ratio of 3106-B-70 and 33089 is 1:1.

[0051] The polyamide wax was purchased from Shenzhen Yoshida Chemical Co., Ltd., model: 6900-20X.

[0052] The nitrocellulose is 1 / 4 second nitrocellulose, purchased from Northern Nitrocellulose Co., Ltd.

[0053] The matting agent is Grace's MSK-C7.

[0054] The additives are dispersants, defoamers, and leveling agents; the weight ratio of the dispersants, defoamers, and leveling agents is 1:0.2:0.1.

[0055] The dispersant is BYK103; the defoamer is BYK141; and the leveling agent is TEGO450.

[0056] The first solvent is cyclohexanone.

[0057] The TDI curing agent comprises a TDI adduct and a TDI trimer, wherein the weight ratio of the TDI adduct to the TDI trimer is 40:30. The TDI adduct is L-75 (Bayer Chemicals); the TDI trimer is HDX-50E from Dongxu Chemicals.

[0058] The second solvent is butyl acetate.

[0059] The dehydrating agent is dehydrating agent BF-5 (Bayer).

[0060] A method for preparing a clear topcoat for home products includes the following steps: First, add the additives to alkyd resin and nitrocellulose, mix them evenly, then add polyamide wax and matting powder and disperse them evenly, adjust the viscosity with a first solvent to obtain component A; add the dehydrating agent and TDI curing agent to a second solvent, mix and stir evenly to obtain component B, and mix components A and B to obtain the final product.

[0061] An application of a clear topcoat for home furnishing products, used in furniture, wooden doors, and desks.

[0062] Example 2

[0063] The specific implementation method is the same as in Example 1; the difference is that in Example 2, the short oil alkyd resin is from Changxing Chemical, and the model is 3106-B-70.

[0064] Example 3

[0065] The specific implementation method is the same as in Example 1; the difference is that in Example 3, the nitrocellulose is nitrocellulose 1 / 8 second, purchased from Northern Nitrocellulose Co., Ltd.

[0066] Example 4

[0067] The specific implementation method is the same as in Example 1; the difference is that in Example 4, the short oil alkyd resin is from Changxing Chemical Co., Ltd., and the model number is 3106-X-70.

[0068] Example 5

[0069] The specific implementation method is the same as in Example 1; the difference is that in Example 5, component B contains 75 wt% TDI curing agent, which includes TDI adduct and TDI trimer, and the weight ratio of TDI adduct to TDI trimer is 40:25.

[0070] Performance testing methods and results

[0071] 1. The clear topcoat prepared in Example 1 to solve the gloss difference between matte front and back spraying was tested for the following properties, and the test results are shown in Table 1.

[0072] Table 1

[0073]

[0074]

[0075] 2. The clear topcoat prepared in Examples 1-5 to address the gloss difference between matte front and back spray coatings was tested according to a simulated on-site environment and established testing standards. The main method was spraying (using a W-71 or W-77 spray gun, with a film thickness of 150-180 g / ㎡; the substrate was mainly solid wood or MDF veneer / multi-layer board veneer, with a PU primer or UV primer applied before the topcoat). The front and back of the coating were separated by a 10 cm distance, then sealed and allowed to dry. After drying, the gloss difference between the front and back was measured; the test results are shown in Table 2.

[0076] Table 2

[0077] Example odor Gloss difference between front and back Example 1 Odorless 1.5 degrees Example 2 Low odor 3 degrees Example 3 Odorless 3 degrees Example 4 Low odor 14.5 degrees Example 5 Odorless 1.5 degrees

Claims

1. A clear finish for a home product, characterized by, The components include, by weight parts: A component, B component, the weight ratio between the A component, B component is 1: (0.3-0.6);The A component, by weight percentage, raw materials include: 50-70% alkyd resin, 1-15% nitrocellulose, 1-5% polyamide wax, 1-5% auxiliary agent, 3-8% mat powder, the first solvent makes up the balance;The B component, by weight percentage, raw materials include: 50-90% TDI curing agent, 0.1-2% dehydrating agent, the second solvent makes up the balance; The alkyd resin includes short oil alkyd resin, the short oil alkyd resin is 3106-B-70 and 33089 compound resin of Changxing Chemical Industry, the weight ratio of 3106-B-70 and 33089 is 2:1-1:2; The TDI curing agent includes TDI adduct and TDI trimer, the weight ratio of TDI adduct and TDI trimer is (30-50):(20-40).

2. The clear finish for a home product according to claim 1, characterized by The nitrocellulose is at least one of nitrocellulose 1 / 2 seconds, nitrocellulose 1 / 4 seconds, nitrocellulose 1 / 8 seconds, nitrocellulose 1 / 16 seconds.

3. The clear finish for a home product according to claim 1, wherein The mat powder is wax treated mat powder.

4. The clear finish for a home product according to claim 1 or 3, characterized by, The auxiliary agent includes dispersant, defoaming agent, leveling agent;The weight ratio between the dispersant, defoaming agent, leveling agent is 1: (0.01-0.4): (0.01-0.2).

5. The clear finish for a household product according to claim 4, wherein The second solvent includes at least one of butyl acetate, ethyl acetate, dimethyl carbonate, propylene glycol methyl ether acetate.

6. A process for the preparation of a clear finish for household products according to any one of claims 1 to 5, characterized in that, It includes the following steps: first, the auxiliary agent is added to the alkyd resin, nitrocellulose, mixed uniformly, then the polyamide wax, mat powder is added and dispersed uniformly, the first solvent is adjusted to the viscosity, the A component is obtained;The dehydrating agent, TDI curing agent is added to the second solvent, mixed and stirred uniformly, the B component is obtained, the A component, B component is mixed, the product is obtained.

7. Use of a clear finish for a household product according to any one of claims 1 to 5, characterized in that, It is applied to furniture, wooden door, desk.

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