Water-based filling primer, preparation method thereof and construction method of deep wood grain base material

Abstract

The invention belongs to the technical field of coatings, and discloses a water-based filling primer, a preparation method thereof and a construction method of a deep wood grain base material. The water-based filling primer is prepared from the following components: monoamino silane resin, a bis-amino silane accelerant, lauric acid, epoxy modified organic silicon resin, diethylene glycol monobutyl ether and methyl phenyl silicone resin. The water-based filling primer not only has high filling performance, but also is low in VOC (volatile organic compound) emission and good in comprehensive performance such as adhesive force, grinding property, tolerance and mechanical strength, and can meet actual application requirements.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a water-based filler primer, its preparation method, and its application method on a deep wood grain substrate. Background Technology

[0002] In the process of solid wood furniture finishing, the texture of deep wood grain substrates is relatively deep and complex, and filling it has always been a challenge for the industry. Currently, the main filler primers used on the market are divided into oil-based filler primers and water-based filler primers, but both of them have some significant drawbacks.

[0003] While oil-based filler primers offer good filling performance, they contain large amounts of organic solvents, such as volatile organic compounds (VOCs) like benzene, toluene, and xylene, which not only severely pollute the environment but also pose significant health risks. Water-based filler primers, while more environmentally friendly, suffer from poor filling performance and slow drying times. Furthermore, both oil-based and water-based filler primers share the common problem of complex application processes, requiring multiple sanding and drying cycles, resulting in low efficiency.

[0004] Therefore, the present invention aims to provide a water-based filler primer product that can be used on dark wood grain substrates, has high filling efficiency, and is environmentally friendly. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a water-based filler primer, its preparation method, and an application method for dark wood grain substrates. This water-based filler primer not only possesses high filling performance but also low VOC emissions, and exhibits excellent comprehensive properties such as adhesion, sandability, durability, and mechanical strength, meeting the needs of practical applications.

[0006] This invention provides an aqueous filler primer comprising the following components: monoaminosilane resin, diaminosilane accelerator, lauric acid, epoxy-modified silicone resin, diethylene glycol butyl ether, and methylphenyl silicone resin.

[0007] Preferably, the water-based filler primer comprises the following components in parts by weight: 35-45 parts of monoaminosilane resin, 1-3 parts of diaminosilane accelerator, 12-20 parts of lauric acid, 20-30 parts of epoxy-modified silicone resin, 4-10 parts of diethylene glycol butyl ether, and 8-15 parts of methylphenyl silicone resin.

[0008] Among them, monoaminosilane resin is an organosilicon compound containing amino groups, which has good adhesion and permeability. It can form a good bond with the wood surface and promote the penetration of the filler primer into the depth of the wood grain, thereby improving the filling effect. This invention uses it as one of the main active ingredients in water-based filler primers.

[0009] The bisaminosilane accelerator contains two amino groups, which can further increase the crosslinking density of the filler primer, significantly improving its filling performance, durability, and adhesion. In the water-based filler primer proposed in this invention, although the amount of bisaminosilane accelerator used is relatively small, it plays a crucial role in improving performance. Adding too much will result in an overly strong odor and a brittle paint film with insufficient adhesion.

[0010] Lauric acid is a saturated fatty acid with good leveling properties. It can effectively reduce the surface tension of filler primers, improve the coating performance of filler primers, reduce the occurrence of pinholes, and thus improve the filling effect.

[0011] Epoxy-modified silicone resin is an organosilicon compound containing epoxy groups, exhibiting excellent water resistance and mechanical strength. It can form a strong bond with wood surfaces while simultaneously improving the impact resistance and abrasion resistance of the filler primer. In the water-based filler primer proposed in this invention, epoxy-modified silicone resin is one of the key components for improving the overall performance of the filler primer.

[0012] Diethylene glycol butyl ether (DGE) is an environmentally friendly solvent that can replace traditional organic solvents and reduce VOC emissions from filler primers. It not only has excellent solubility but also improves the application properties of filler primers, making it an important component for achieving low VOC emissions.

[0013] Methylphenyl silicone resin is an organosilicon resin with excellent filling and sanding properties. It enhances the filling performance of filler primers, allowing them to better fill deep wood grain. Simultaneously, methylphenyl silicone resin also improves the sanding properties of filler primers, facilitating subsequent application and making it a key component in enhancing the overall performance of filler primers.

[0014] By adopting the above formulation, the water-based filler primer proposed in this invention achieves high filling efficiency and excellent comprehensive performance (good adhesion, sandability, durability and mechanical strength) while ensuring low VOC emissions.

[0015] Preferably, the monoaminosilane resin is selected from at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, N-ethyl-γ-aminopropyltrimethoxysilane, and N-phenyl-γ-aminopropyltrimethoxysilane.

[0016] Preferably, the bisaminosilane accelerator is selected from at least one of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropyltriethoxysilane.

[0017] Preferably, the epoxy-modified silicone resin is selected from Sichuan Xingli XLT-1743.

[0018] Preferably, the methylphenyl silicone resin is selected from Wacker Chemie SILRES IC 900.

[0019] The present invention also provides a method for preparing the above-mentioned water-based filler primer, comprising the following steps: The components are mixed and dispersed to obtain a water-based filler primer.

[0020] Preferably, the mixing speed is 1000-1500 rpm and the mixing time is 20-60 minutes.

[0021] The present invention also provides a construction method for a deep wood grain substrate, comprising the following steps in sequence: surface treatment of the deep wood grain substrate, application of PU sealing primer, first sanding, spraying of the above-mentioned water-based filling primer, curing, second sanding, spraying of water-based transparent primer, third sanding, and spraying of water-based transparent topcoat.

[0022] The surface treatment of the deep wood grain substrate includes operations such as cleaning, degreasing, and sanding to ensure that the substrate surface is clean and flat; the wet film thickness of the PU sealing primer is 5-10μm; the curing time is about 2 hours (room temperature); the wet film thickness of the water-based transparent primer is about 30μm; and the wet film thickness of the water-based transparent topcoat is about 40μm.

[0023] Preferably, the wet film thickness of the above-mentioned water-based filler primer is 80-120 μm.

[0024] Compared to traditional filler primers that require multiple coats (≥3 coats) to fill deep wood grain, the water-based filler primer proposed in this invention has better filling performance, requiring only one coat to fill deep wood grain, and has a faster curing speed. The interval between each process is also shortened accordingly, further improving construction efficiency, greatly reducing construction time and labor intensity, and achieving low VOC emissions.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The water-based filler primer of the present invention adopts a water-based system and adds the environmentally friendly solvent diethylene glycol butyl ether, which effectively reduces VOC emissions. Compared with traditional oil-based filler primers, VOC emissions are reduced by more than 50%. This not only complies with increasingly stringent environmental regulations, but also reduces the harm to the health of construction workers and improves the construction environment.

[0026] (2) Traditional filler primers require multiple coats (≥3 coats) to fill deep wood grain, while the water-based filler primer of this invention only requires one coat to fill deep wood grain, which greatly reduces construction time and labor intensity and improves construction efficiency.

[0027] (3) The water-based filler primer of the present invention has good adhesion, sandability, water resistance and mechanical strength, and excellent comprehensive performance, which can meet the needs of practical applications. Detailed Implementation

[0028] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0029] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0030] Example 1 A water-based filler primer, the components of which are shown in Table 1: Table 1 The preparation method of the above-mentioned water-based filler primer includes the following steps: Add the above raw materials to a mixing tank and mix them using a high-speed disperser at a speed of 1200 rpm for 30 minutes to form a uniform water-based filler primer.

[0031] Example 2 A water-based filler primer, the components of which are shown in Table 2: Table 2 The preparation method of the above-mentioned water-based filler primer is the same as that in Example 1.

[0032] Comparative Example 1 A water-based filler primer, the components of which are shown in Table 3: Table 3 The preparation method of the above-mentioned water-based filler primer is the same as that in Example 1.

[0033] Compared with Example 1, the difference of the water-based filler primer in Comparative Example 1 is that it does not contain the diaminosilane accelerator (i.e., N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane), and the weight of the monoaminosilane resin (i.e., γ-aminopropyltriethoxysilane) is increased to 42 parts.

[0034] Comparative Example 2 A water-based filler primer, the components of which are shown in Table 4: Table 4 The preparation method of the above-mentioned water-based filler primer is the same as that in Example 1.

[0035] Compared with Example 1, the difference of the water-based filler primer in Comparative Example 2 is that it does not contain epoxy-modified silicone resin, the weight parts of monoaminosilane resin (i.e., γ-aminopropyltriethoxysilane) are increased to 55 parts, and the weight parts of methylphenyl silicone resin are increased to 22 parts.

[0036] Comparative Example 3 A water-based filler primer, the components of which are shown in Table 5: Table 5 The preparation method of the above-mentioned water-based filler primer is the same as that in Example 1.

[0037] Compared with Example 1, the difference of the water-based filler primer in Comparative Example 3 is that it does not contain methylphenyl silicone resin, the weight of monoaminosilane resin (i.e. γ-aminopropyltriethoxysilane) is increased to 50 parts, and the weight of epoxy-modified silicone resin is increased to 27 parts.

[0038] Comparative Example 4 A water-based filler primer, the components of which are shown in Table 6: Table 6 The preparation method of the above-mentioned water-based filler primer is the same as that in Example 1.

[0039] Compared with Comparative Example 1, the difference of the water-based filler primer in Comparative Example 4 is that it does not contain lauric acid, the weight parts of monoaminosilane resin (i.e., γ-aminopropyltriethoxysilane) are increased to 50 parts, and the weight parts of methylphenylsilane resin are increased to 20 parts.

[0040] Performance testing The performance of the water-based filler primers in Example 1 and Comparative Examples 1-4 were tested as follows: Hardness, adhesion, resistance to 10% acetic acid, alcohol resistance, and water resistance: After plate making, dry at 50℃ for 12 hours and then test. Filling properties: After spraying, dry at 50℃ for 12 hours and then test; Leveling properties: Observe after spraying and before surface drying.

[0041] The test results are shown in Table 7: Table 7 Note: Levels 1 to 4 are ranked from best to worst.

[0042] As shown in Table 7, the water-based filler primer in Comparative Example 1 has significantly reduced filling performance and resistance (water resistance, alcohol resistance, and acid resistance) due to the absence of a diaminosilane accelerator. The water-based filler primer in Comparative Example 2 does not contain epoxy-modified silicone resin, resulting in poor hardness and leveling properties. The water-based filler primer in Comparative Example 3 lacks methylphenyl silicone resin, resulting in insufficient filling performance and resistance. Comparative Example 4 further lacks lauric acid compared to Comparative Example 1, resulting in pinholes and poor leveling, thus failing to fill effectively.

[0043] This invention, by simultaneously adding a diaminosilane accelerator and methylphenyl silicone resin to a monoaminosilane resin, effectively improves the filling performance of water-based filler primers, enabling them to better fill deep wood grain and significantly enhance the film's durability. The addition of epoxy-modified silicone resin and lauric acid effectively improves leveling properties and also enhances film hardness, filling properties, and adhesion. Furthermore, this invention uses diethylene glycol butyl ether as an environmentally friendly solvent, replacing traditional organic solvents and greatly reducing VOC emissions. This not only meets environmental protection requirements but also improves the construction environment and reduces health hazards to construction workers.

[0044] Construction of dark wood grain substrate Table 8 shows the application process flow of the water-based filler primer product in Example 1. Table 8 Compared to traditional filler primers that require multiple coats to fill deep wood grain, the water-based filler primer of this invention only requires one coat, significantly reducing construction steps and time, and improving construction efficiency. Furthermore, the water-based filler primer proposed in this invention achieves low VOC emissions, and its adhesion, sandability, water resistance, and mechanical strength are significantly improved, meeting the actual needs of furniture coating.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A water-based filler primer, characterized in that, It includes the following components: monoaminosilane resin, diaminosilane accelerator, lauric acid, epoxy-modified organosilicon resin, diethylene glycol butyl ether, and methylphenyl silicone resin.

2. The water-based filler primer according to claim 1, characterized in that, The water-based filler primer comprises the following components in parts by weight: 35-45 parts monoaminosilane resin, 1-3 parts diaminosilane accelerator, 12-20 parts lauric acid, 20-30 parts epoxy-modified silicone resin, 4-10 parts diethylene glycol butyl ether, and 8-15 parts methylphenyl silicone resin.

3. The water-based filler primer according to claim 1 or 2, characterized in that, The monoaminosilane resin is selected from at least one of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldimethoxysilane, N-ethyl-γ-aminopropyltrimethoxysilane, and N-phenyl-γ-aminopropyltrimethoxysilane.

4. The water-based filler primer according to claim 1 or 2, characterized in that, At least one of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and N-(β-aminoethyl)-γ-aminopropyltriethoxysilane.

5. The water-based filler primer according to claim 1 or 2, characterized in that, The epoxy-modified silicone resin was selected from Sichuan Xingli XLT-1743.

6. The water-based filler primer according to claim 1 or 2, characterized in that, The methylphenyl silicone resin is selected from Wacker Chemie SILRES IC 900.

7. A method for preparing the water-based filler primer according to any one of claims 1-6, comprising the following steps: The components are mixed and dispersed to obtain a water-based filler primer.

8. The preparation method according to claim 7, characterized in that, The mixing speed is 1000-1500 rpm, and the mixing time is 20-60 minutes.

9. A construction method for a deep wood grain substrate, characterized in that, The steps are as follows: The process involves surface treatment of a deep wood grain substrate, application of a PU sealing primer, initial sanding, spraying of the water-based filling primer as described in any one of claims 1-6, curing, secondary sanding, spraying of a water-based transparent primer, tertiary sanding, and spraying of a water-based transparent topcoat.

10. The construction method according to claim 9, characterized in that, The wet film thickness of the water-based filler primer is 80-120 μm.

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