Water-based release agent and preparation method thereof

Abstract

The invention discloses a water-based release agent and a preparation method thereof, and belongs to the technical field of chemical engineering, and the water-based release agent comprises deionized water, acrylate resin, water-based polyurethane containing tetramethylbenzene dimethyl diisocyanate groups, epoxy resin, a surfactant, a plasticizer, a nano filler, a preservative, an antistatic agent, a defoaming agent and a thickening agent. The resin system in the formula system comprises the acrylate resin, the waterborne polyurethane containing the tetramethyl benzene dimethyl diisocyanate group and the epoxy resin, the acrylate resin has good adhesive force, weather resistance and wear resistance, the strength and durability of a coating film can be remarkably improved, and the coating film is not prone to falling off. Chemical bonds can be formed among molecules in a coating film by the waterborne polyurethane containing the tetramethyl benzene dimethyl diisocyanate group and the epoxy resin, so that the cohesive force and the strength of a film layer are improved; the hardness and wear resistance of the coating film can be enhanced by adding the nano filler, so that the water-based release agent solves the problems that the coating film is fragile, cracks and loss are easy to generate and the drying time is relatively long.

Description

Technical Field

[0001] The invention relates to the technical field of chemical engineering, and in particular to a water-based release agent and a preparation method thereof. Background Art

[0002] Release agent is a kind of isolation film applied between the product and the mold to prevent the molded composite product from sticking to the mold, so that the product can be easily removed from the mold while ensuring the surface quality of the product and the mold are intact. The application of release agent is very important in many industrial fields, especially in the processing and molding of polymer materials such as rubber, plastic, food, etc.

[0003] The main component of water-based release agent is water, which is non-toxic, odorless, non-corrosive and non-irritating. During the production process, the water-based release agent is adsorbed on the mold surface to improve the smoothness of the mold surface and prevent plastics, rubber, etc. from adhering to the mold surface, thereby achieving the purpose of increasing the mold life and improving the quality of the product.

[0004] The water-based release agents in the prior art have the disadvantages of being relatively fragile in coating film, prone to cracking and loss, and having a relatively long drying time. Summary of the invention

[0005] Based on the above problems, the embodiments of the present invention provide a water-based release agent and a preparation method thereof. The coating film of the water-based release agent does not have the disadvantages of being fragile, prone to cracking and loss, and having a relatively long drying time. The contents of the present invention are as follows:

[0006] The object of the present invention is to provide a water-based release agent, which technical point is that, in parts by weight, it comprises 30-60 parts by weight of deionized water, 20-30 parts by weight of an acrylate resin, 10-20 parts by weight of an aqueous polyurethane containing a tetramethylxylylene diisocyanate group, 10-20 parts by weight of an epoxy resin, 1-5 parts by weight of a surfactant, 1-5 parts by weight of a plasticizer, 2-4 parts by weight of a nanofiller, 0.1-1 parts by weight of a preservative, 0.1-1 parts by weight of an antistatic agent, 0.1-1 parts by weight of a defoamer and 0.5-5 parts by weight of a thickener.

[0007] In order to better realize the above technical solution, the surfactant in the water-based release agent of the present invention is a nonionic surfactant or an anionic surfactant.

[0008] In order to better realize the above technical scheme, the nonionic surfactant in the water-based release agent of the present invention is at least one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and fatty amine polyoxyethylene ether.

[0009] In order to better realize the above technical solution, the anionic surfactant in the water-based release agent of the present invention is at least one of alkylbenzene sulfonate, alkyl ether sulfate and alkyl sulfate.

[0010] In order to better realize the above technical solution, the nano filler in the water-based release agent of the present invention is at least one of nano silicon dioxide and nano aluminum oxide.

[0011] In order to better realize the above technical scheme, the antistatic agent in the water-based release agent of the present invention is at least one of glyceryl monostearate, ethoxylated alkylamine and (3-laurylamidopropyl)trimethylammonium methyl sulfate.

[0012] In order to better realize the above technical solution, the defoamer in the water-based release agent of the present invention is at least one of an organosilicon defoamer, a polyether defoamer and a silicone ether defoamer.

[0013] Another object of the present invention is to provide a method for preparing a water-based release agent, which comprises the following steps:

[0014] Step 1: Evenly mix acrylate resin, waterborne polyurethane containing tetramethylxylene diisocyanate group and epoxy resin, disperse them in deionized water, mix evenly at a speed of 100-200 rpm and heat to 40-50° C.;

[0015] Step 2: Add surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener to the mixture in step 1, mix evenly at a speed of 120-150 rpm, heat to 85-95° C., mix evenly and cool to below 40° C. to obtain the water-based release agent.

[0016] Compared with the prior art, the water-based release agent and the preparation method thereof of the present invention have the following beneficial effects:

[0017] The water-based release agent of the present invention comprises deionized water, acrylate resin, water-based polyurethane containing tetramethylphenylenedimethyl diisocyanate groups, epoxy resin, surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener. The resin system in the formula system of the present invention comprises acrylate resin, water-based polyurethane containing tetramethylphenylenedimethyl diisocyanate groups and epoxy resin, wherein the acrylate resin has good adhesion, weather resistance and wear resistance, and can significantly improve the strength and durability of the coating film; the water-based polyurethane containing tetramethylphenylenedimethyl diisocyanate groups and the epoxy resin can form chemical bonds between molecules in the coating film, and improve the cohesion and strength of the film layer; the addition of nanofiller can enhance the hardness and wear resistance of the coating film, so the water-based release agent of the present invention solves the problems that the coating film is fragile, easy to crack and lose, and has a relatively long drying time. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments 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 work are within the scope of protection of the present invention.

[0019] Example 1

[0020] A water-based release agent includes 45 kg of deionized water, 25 kg of acrylate resin, 15 kg of water-based polyurethane containing tetramethylxylene diisocyanate groups, 15 kg of epoxy resin, 3 kg of surfactant, 3 kg of plasticizer, 3 kg of nanofiller, 0.5 kg of preservative, 0.5 kg of antistatic agent, 0.5 kg of defoamer and 2.5 kg of thickener.

[0021] Furthermore, the surfactant in the water-based release agent of this embodiment is a non-ionic surfactant.

[0022] Furthermore, the nonionic surfactant in the water-based release agent of this embodiment is alkylphenol polyoxyethylene ether.

[0023] Furthermore, the nano filler in the water-based release agent of this embodiment is nano silicon dioxide.

[0024] Furthermore, the antistatic agent in the water-based release agent of this embodiment is glyceryl monostearate.

[0025] Furthermore, the defoaming agent in the water-based release agent of this embodiment is a silicone defoaming agent.

[0026] According to the above formula, a method for preparing a water-based release agent of the present invention comprises the following steps:

[0027] Step 1: Mix acrylate resin, waterborne polyurethane containing tetramethylxylene diisocyanate group and epoxy resin evenly, disperse them in deionized water, mix them evenly at a speed of 150 rpm and heat them to 45° C.;

[0028] Step 2: Add surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener to the mixture in step 1, mix evenly at 135 rpm, heat to 90° C., mix evenly and cool to below 40° C. to obtain the water-based release agent.

[0029] Example 2

[0030] A water-based release agent includes 30 kg of deionized water, 20 kg of acrylate resin, 10 kg of water-based polyurethane containing tetramethylxylene diisocyanate groups, 10 kg of epoxy resin, 1 kg of surfactant, 1 kg of plasticizer, 2 kg of nanofiller, 0.1 kg of preservative, 0.1 kg of antistatic agent, 0.1 kg of defoamer and 0.5 kg of thickener.

[0031] Furthermore, the surfactant in the water-based release agent of this embodiment is an anionic surfactant.

[0032] Furthermore, the nonionic surfactant in the water-based release agent of this embodiment is fatty alcohol polyoxyethylene ether.

[0033] Furthermore, the anionic surfactant in the water-based release agent of this embodiment is alkylbenzene sulfonate.

[0034] Furthermore, the nano filler in the water-based release agent of this embodiment is nano alumina.

[0035] Furthermore, the antistatic agent in the water-based release agent of this embodiment is ethoxylated alkylamine.

[0036] Furthermore, the defoaming agent in the water-based release agent of this embodiment is a polyether defoaming agent.

[0037] According to the above formula, a method for preparing a water-based release agent of the present invention comprises the following steps:

[0038] Step 1: Mix acrylate resin, waterborne polyurethane containing tetramethylxylene diisocyanate group and epoxy resin evenly, disperse them in deionized water, mix evenly at 100 rpm and heat to 50° C.;

[0039] Step 2: Add surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener to the mixture in step 1, mix evenly at 120 rpm, heat to 95° C., mix evenly and cool to below 40° C. to obtain the water-based release agent.

[0040] Example 3

[0041] A water-based release agent includes 60 kg of deionized water, 30 kg of acrylate resin, 20 kg of water-based polyurethane containing tetramethylxylene diisocyanate groups, 20 kg of epoxy resin, 5 kg of surfactant, 5 kg of plasticizer, 4 kg of nanofiller, 1 kg of preservative, 1 kg of antistatic agent, 1 kg of defoamer and 5 kg of thickener.

[0042] Furthermore, the surfactant in the water-based release agent of this embodiment is a mixture of a nonionic surfactant and an anionic surfactant, and the mass ratio of the two is 1:1.

[0043] Furthermore, the nonionic surfactant in the water-based release agent of this embodiment is fatty alcohol polyoxyethylene ether.

[0044] Furthermore, the anionic surfactant in the water-based release agent of this embodiment is an alkyl sulfate.

[0045] Furthermore, the nanofiller in the water-based release agent of this embodiment is a mixture of nano-silicon dioxide and nano-aluminum oxide, and the mass ratio of the two is 1:1.

[0046] Furthermore, the antistatic agent in the water-based release agent of this embodiment is (3-laurylamidopropyl)trimethylammonium methyl sulfate.

[0047] Furthermore, the defoaming agent in the water-based release agent of this embodiment is a silicone ether defoaming agent.

[0048] According to the above formula, a method for preparing a water-based release agent of the present invention comprises the following steps:

[0049] Step 1: Mix acrylate resin, waterborne polyurethane containing tetramethylxylene diisocyanate group and epoxy resin evenly, disperse them in deionized water, mix them evenly at 200 rpm and heat to 40° C.;

[0050] Step 2: Add surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener to the mixture in step 1, mix evenly at 150 rpm, heat to 85° C., mix evenly and cool to below 40° C. to obtain the water-based release agent.

[0051] Comparative Example 1

[0052] The "45 kg of deionized water, 25 kg of acrylate resin, 15 kg of aqueous polyurethane containing tetramethylxylene diisocyanate groups, 15 kg of epoxy resin, 3 kg of surfactant, 3 kg of plasticizer, 3 kg of nanofiller, 0.5 kg of preservative, 0.5 kg of antistatic agent, 0.5 kg of defoamer and 2.5 kg of thickener" in Example 1 is changed to "45 kg of deionized water, 40 kg of acrylate resin, 15 kg of aqueous polyurethane containing tetramethylxylene diisocyanate groups, 3 kg of surfactant, 3 kg of plasticizer, 3 kg of nanofiller, 0.5 kg of preservative, 0.5 kg of antistatic agent, 0.5 kg of defoamer and 2.5 kg of thickener", and the remaining operations are the same as Example 1.

[0053] Comparative Example 2

[0054] The "45 kg of deionized water, 25 kg of acrylate resin, 15 kg of aqueous polyurethane containing tetramethylxylene diisocyanate groups, 15 kg of epoxy resin, 3 kg of surfactant, 3 kg of plasticizer, 3 kg of nanofiller, 0.5 kg of preservative, 0.5 kg of antistatic agent, 0.5 kg of defoamer and 2.5 kg of thickener" in Example 1 is changed to "45 kg of deionized water, 40 kg of acrylate resin, 15 kg of epoxy resin, 3 kg of surfactant, 3 kg of plasticizer, 3 kg of nanofiller, 0.5 kg of preservative, 0.5 kg of antistatic agent, 0.5 kg of defoamer and 2.5 kg of thickener", and the remaining operations are the same as Example 1.

[0055] Test example

[0056] The performance of the water-based release agents prepared in Examples 1-3 and Comparative Examples 1-2 was tested with reference to Standard Q / 32050KZ04-2022. The test results are shown in Table 1:

[0057] Peel force: Cut the coating film into strips with a width of 15 mm, and use a tensile testing machine (with a minimum scale of 0.01 g) to test the tensile force after the break, in g.

[0058] Temperature resistance test method: Cut the coated paint film into 10×10cm 2 Put the large and small films into a constant temperature blast oven and bake them at 180℃ for 5 minutes. Take them out and observe. If there are no defects such as panning and loss of gloss, it is judged that the temperature resistance is greater than 180℃.

[0059] Table 1

[0060]

[0061] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A water-based release agent, characterized in that: In parts by weight, the invention comprises 30-60 parts by weight of deionized water, 20-30 parts by weight of an acrylate resin, 10-20 parts by weight of an aqueous polyurethane containing a tetramethylxylylene diisocyanate group, 10-20 parts by weight of an epoxy resin, 1-5 parts by weight of a surfactant, 1-5 parts by weight of a plasticizer, 2-4 parts by weight of a nanofiller, 0.1-1 parts by weight of a preservative, 0.1-1 parts by weight of an antistatic agent, 0.1-1 parts by weight of a defoaming agent and 0.5-5 parts by weight of a thickener.

2. A water-based release agent according to claim 1, characterized in that: The surfactant is a nonionic surfactant or an anionic surfactant.

3. A water-based release agent according to claim 2, characterized in that: The nonionic surfactant is at least one of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and fatty amine polyoxyethylene ether.

4. A water-based release agent according to claim 2, characterized in that: The anionic surfactant is at least one of alkylbenzene sulfonate, alkyl ether sulfate and alkyl sulfate.

5. The water-based release agent according to claim 1, characterized in that: The nano filler is at least one of nano silicon dioxide and nano aluminum oxide.

6. A water-based release agent according to claim 1, characterized in that: The antistatic agent is at least one of glyceryl monostearate, ethoxylated alkylamine and (3-laurylamidopropyl)trimethylammonium methyl sulfate.

7. The water-based release agent according to claim 1, characterized in that: The defoamer is at least one of an organosilicon defoamer, a polyether defoamer and a silicone ether defoamer.

8. A method for preparing a water-based release agent, characterized in that: The following steps are involved: Step 1: Evenly mix acrylate resin, waterborne polyurethane containing tetramethylxylene diisocyanate group and epoxy resin, disperse them in deionized water, mix evenly at a speed of 100-200 rpm and heat to 40-50° C.; Step 2: Add surfactant, plasticizer, nanofiller, preservative, antistatic agent, defoamer and thickener to the mixture in step 1, mix evenly at a speed of 120-150 rpm, heat to 85-95° C., mix evenly and cool to below 40° C. to obtain the water-based release agent.

Images