Water-based primer capable of being covered with glue and preparation method of water-based primer

Abstract

The invention discloses a water-based primer capable of being covered with glue and a preparation method of the water-based primer, and relates to the field of water-based primer, and the water-based primer is prepared by mixing the following raw materials in percentage: 45-55% of acrylic emulsion, 0.2-0.4% of wetting agent, 0.3-0.5% of defoaming agent, 0.3-0.8% of dispersing agent, inorganic filler, 3-5% of coalescing agent, 0.5-1% of thickening agent and the balance of water. According to the water-based primer capable of being covered with the glue and the preparation method of the water-based primer, a formed paint film is hard and is easy to crack on the glue; and the Tg value is less than 15 DEG C. A paint film with the performance is very good in flexibility and does not crack on glue. The amount of the filler is controlled to be 20-30%, so that a certain filling property of the primer can be ensured, and the flexibility and hardness of the primer can also be controlled.

Description

Technical Field

[0001] The invention relates to the field of water-based primers, in particular to a water-based primer capable of covering glue and a preparation method thereof. Background Art

[0002] Wood products are glued together during the assembly process before painting. After the glue is glued together, glue will overflow around the wood products. It is difficult to completely clean the glue after it overflows. The use of traditional oil-based paint will not cause cracking in the places where the glue overflows. However, oil-based paint contains a large amount of organic solvents, which will cause great harm to construction workers and the environment, and there are fire safety hazards. For environmental and safety reasons, wood coatings have gradually shifted from oil-based paints to safer and more environmentally friendly water-based paints, especially in wooden children's toys and children's furniture, which have basically become all water-based. Traditional water-based primers are easy to crack on glue due to their high hardness and poor flexibility. The cracking affects the painting effect of wood products and requires rework, resulting in the need for sanding, repainting, and rework, which wastes time and costs. Therefore, it is very beneficial to invent a water-based primer that can cover glue. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a water-based primer capable of covering glue and a preparation method thereof, so as to solve the problem that the traditional water-based primer is prone to cracking when applied on the glue.

[0004] To achieve the above object, the present invention provides the following technical solution: a water-based primer that can cover glue, which is made by mixing the following raw materials according to percentage:

[0005] Acrylic emulsion 45-55%, wetting agent 0.2-0.4%, defoamer 0.3-0.5%, dispersant 0.3-0.8%, inorganic filler, film-forming aid 3-5%, thickener 0.5-1%, and the balance is water.

[0006] Preferably, the Tg value of the acrylic emulsion is 5°C≤Tg≤15°C.

[0007] Preferably, the inorganic filler is calcite powder and / or talc powder.

[0008] Preferably, the inorganic filler is composed of calcite powder and talc powder, which account for 8-15% and 5-10% of the water-based primer raw material respectively.

[0009] Preferably, the wetting agent is a nonionic wetting agent, the defoaming agent is a silicone defoaming agent, the disperser is an inorganic dispersant, the film-forming aid is dipropylene glycol methyl ether, and the thickener is a nonionic thickener.

[0010] The present invention also discloses a method for preparing a water-based primer capable of covering glue, comprising the following steps:

[0011] 45-55% of acrylic emulsion, 0.2-0.4% of wetting agent, 0.3-0.5% of defoaming agent, 0.3-0.8% of dispersant, 20-30% of inorganic filler, 3-5% of film-forming aid and the balance of water are slowly added into a reaction kettle in sequence and stirred to obtain a mixture, and the viscosity of the mixture is adjusted with a thickener to obtain a water-based primer.

[0012] Beneficial Effects

[0013] The present invention provides a water-based primer capable of covering glue and a preparation method thereof, which has the following beneficial effects:

[0014] Traditional water-based primers are easy to crack on glue due to their high hardness and poor flexibility. After cracking, rework is required for repair and secondary coating is required. Even the cracked parts need to be specially polished and brushed with primer to cover the rework, which increases the working time and cost. In the present invention, the water-based primer can be directly applied on the glue without cracking, avoiding the problem of traditional water-based primers cracking and causing rework when applied on the glue. The Tg value of the acrylic emulsion used is 5℃≤Tg≤15℃. When the Tg value is greater than 15℃, the paint film formed is harder and is easy to crack on the glue; when the Tg value is less than 15℃, the paint film has very good flexibility and does not crack on the glue. Controlling the amount of filler between 20-30% can ensure a certain filling property of the primer and control the flexibility and hardness of the primer. DETAILED DESCRIPTION

[0015] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0016] Embodiment 1:

[0017] raw material:

[0018] Prepare the raw materials according to the following mass percentages: acrylic emulsion 45%, RF-1011

[0019] Type wetting agent 0.2%, silicone polyetherketone defoamer 0.3%, epoxy resin dispersant 0.3%, 8% calcite powder, 10% talcum powder, 3% dipropylene glycol methyl ether, 0.5% non-ionic thickener, the balance is water, wherein the Tg value of the acrylic emulsion is 10°C.

[0020] Preparation method: slowly add the above raw materials into a reaction kettle in order and stir to obtain a mixture, and use a non-ionic thickener to adjust the viscosity of the mixture to obtain a water-based primer.

[0021] Embodiment 2:

[0022] raw material:

[0023] Prepare the raw materials according to the following mass percentages: acrylic emulsion 50%, RF-1011

[0024] Type wetting agent 0.3%, silicone polyetherketone defoamer 0.4%, epoxy resin dispersant 0.5%, 12% calcite powder, 9% talcum powder, dipropylene glycol methyl ether 4%, non-ionic thickener 0.8%, the balance is water, wherein the Tg value of the acrylic emulsion used is 12°C.

[0025] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0026] Embodiment 3:

[0027] raw material:

[0028] Prepare the raw materials according to the following mass percentages: acrylic emulsion 55%, RF-1011

[0029] Type wetting agent 0.4%, silicone polyetherketone defoamer 0.5%, epoxy resin dispersant 0.7%, 15% calcite powder, 10% talcum powder, 5% dipropylene glycol methyl ether, 1% non-ionic thickener, the balance is water, wherein the Tg value of the acrylic emulsion is 18°C.

[0030] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0031] Comparative Example 1:

[0032] raw material:

[0033] Prepare the raw materials according to the following mass percentages: acrylic emulsion 45%, RF-1011

[0034] Type wetting agent 0.2%, silicone polyetherketone defoamer 0.3%, epoxy resin dispersant 0.3%, 8% calcite powder, 10% talcum powder, 3% dipropylene glycol methyl ether, 0.5% non-ionic thickener, the balance is water, wherein the Tg value of the acrylic emulsion is 10°C.

[0035] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0036] Comparative Example 2:

[0037] raw material:

[0038] Prepare the raw materials according to the following mass percentages: acrylic emulsion 45%, RF-1011

[0039] Type wetting agent 0.2%, silicone polyetherketone defoamer 0.3%, epoxy resin dispersant 0.3%, 15% calcite powder, 10% talcum powder, dipropylene glycol methyl ether 3%, non-ionic thickener 0.5%, the balance is water, wherein the Tg value of the acrylic emulsion used is 18°C.

[0040] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0041] Comparative Example 3:

[0042] raw material:

[0043] Prepare the raw materials according to the following mass percentages: acrylic emulsion 50%, RF-1011

[0044] Type wetting agent 0.3%, silicone polyetherketone defoamer 0.4%, epoxy resin dispersant 0.5%, 8% calcite powder, 10% talcum powder, dipropylene glycol methyl ether 3%, non-ionic thickener 0.5%, the balance is water, wherein the Tg value of the acrylic emulsion is 10°C.

[0045] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0046] Comparative Example 4:

[0047] raw material:

[0048] Prepare the raw materials according to the following mass percentages: acrylic emulsion 50%, RF-1011

[0049] Type wetting agent 0.3%, silicone polyetherketone defoamer 0.4%, epoxy resin dispersant 0.5%, 15% calcite powder, 10% talcum powder, dipropylene glycol methyl ether 3%, non-ionic thickener 0.5%, the balance is water, wherein the Tg value of the acrylic emulsion used is 18°C.

[0050] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0051] Comparative Example 5:

[0052] raw material:

[0053] Prepare the raw materials according to the following mass percentages: acrylic emulsion 55%, RF-1011

[0054] Type wetting agent 0.4%, silicone polyetherketone defoamer 0.5%, epoxy resin dispersant 0.7%, 8% calcite powder, 10% talcum powder, 3% dipropylene glycol methyl ether, 0.5% non-ionic thickener, the balance is water, wherein the Tg value of the acrylic emulsion used is 10°C.

[0055] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0056] Comparative Example 6:

[0057] raw material:

[0058] Prepare the raw materials according to the following mass percentages: acrylic emulsion 55%, RF-1011

[0059] Type wetting agent 0.4%, silicone polyetherketone defoamer 0.5%, epoxy resin dispersant 0.7%, 15% calcite powder, 10% talcum powder, dipropylene glycol methyl ether 3%, non-ionic thickener 0.5%, the balance is water, wherein the Tg value of the acrylic emulsion used is 18°C.

[0060] Preparation method: A water-based primer is obtained according to the preparation method of Example 1.

[0061] In summary, the flexibility of the water-based primers obtained in Examples 1-3 and Comparative Examples 1-6 was tested by a QTX paint film elasticity tester (test standard is GB / T 1731-93), and the hardness of the water-based primers obtained in Examples 1-3 and Comparative Examples 1-6 was tested by a pendulum damping test (test standard is GB / T 1730-93). Finally, the hardness difference between the water-based primers in Examples 1-3 and Comparative Examples 1-6 was small, the flexibility of the water-based primers in Examples 1-3 was higher than that in Comparative Examples 1-6, and the flexibility of the water-based primer in Example 2 was the best, so Example 2 was the optimal example.

Claims

1. A water-based primer that can cover glue, characterized in that: It is made by mixing the following raw materials according to mass percentage: Acrylic emulsion 45-55%, wetting agent 0.2-0.4%, defoamer 0.3-0.5%, dispersant 0.3-0.8%, inorganic filler 20-30%, film-forming aid 3-5%, thickener 0.5-1%, and the balance is water.

2. The water-based primer capable of covering glue according to claim 1, characterized in that: The Tg value of the acrylic emulsion is 5℃≤Tg≤15℃.

3. The method for preparing a water-based primer capable of covering glue according to claim 2, characterized in that: The inorganic filler is calcite powder and / or talc powder.

4. The water-based primer capable of covering glue according to claim 3, characterized in that: The inorganic filler consists of calcite powder and talcum powder, which respectively account for 8-15% of the water-based primer raw material.

5. The water-based primer capable of covering glue according to claim 4, characterized in that: The wetting agent is a nonionic wetting agent, the defoaming agent is a silicone defoaming agent, the dispersing agent is an inorganic dispersing agent, the film-forming aid is dipropylene glycol methyl ether, and the thickener is a nonionic thickener.

6. A method as claimed in claim 1 The method for preparing the water-based primer capable of covering glue according to any one of the above items is characterized in that: The following steps are involved: Add 45-55% acrylic emulsion, 0.2-0.4% wetting agent, 0.3-0.5% defoamer, 0.3-0.8% dispersant, 20-30% inorganic filler, 3- 5% and the balance being water are slowly added into a reaction kettle in sequence and stirred to obtain a mixture, and a thickener is used to adjust the viscosity of the mixture to obtain a water-based primer.