Preparation method of environmentally friendly water-based release agent and its prepared products and applications

Abstract

The present invention belongs to the technical field of release agents, and specifically relates to a method for preparing an environmentally friendly water-based release agent, and products and applications thereof. The preparation method of the environmentally friendly water-based release agent is as follows: (1) heating and melting a hydrocarbon wax substance, adding a silicone oil surfactant and an emulsifier to the melted hydrocarbon wax substance and mixing, then adding water with a temperature of ≥90°C and mixing to obtain a mixed solution; adding an ethanol aqueous solution to the mixed solution and mixing to obtain an emulsion; (2) adding a polylactic acid solution to the emulsion, stirring and mixing at 60°C-70°C to obtain the environmentally friendly water-based release agent. The water-based release agent prepared by the present invention is green and environmentally friendly, has a low preparation cost, and has good demolding properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of release agents, and specifically provides a method for preparing an environmentally friendly water-based release agent, and a product prepared therefrom and applications thereof. Background Art

[0002] Polyurethane is a widely used polymer synthetic material. Its diverse raw materials and formulations contribute to its unique properties and wide range of applications. Polyurethane foam is the primary type of polyurethane product, accounting for over half of all polyurethane production. The molding process for polyurethane foam requires high-temperature hot pressing, and molds are typically made of highly thermally conductive materials such as aluminum and steel. However, because the isocyanate component in the polyurethane foaming raw material is adhesive and forms a strong bond with the metal, a suitable release agent is required to prevent adhesion between the polyurethane foam product and the mold, tearing the foam surface during demolding, and damaging the foam surface quality. Commonly used release agents include oil-based and water-based release agents. Existing oil-based release agents contain volatile organic compounds, which pollute the environment. Existing water-based release agents, most of which contain fluorinated substances, are also highly polluting. Furthermore, they can easily form lumps and resist dispersion after multiple spraying applications, and their water evaporates slowly, reducing the production efficiency of polyurethane plastic products. Therefore, there is an urgent need for a water-based release agent that provides effective and environmentally friendly release. Summary of the Invention

[0003] In view of the problems and shortcomings in the prior art, the purpose of the present invention is to provide a method for preparing an environmentally friendly water-based release agent and the products prepared therefrom and their applications.

[0004] To achieve the purpose of the invention, the technical solution adopted by the present invention is as follows:

[0005] The first aspect of the present invention provides a method for preparing an environmentally friendly water-based release agent, comprising the following steps:

[0006] (1) heating and melting a hydrocarbon wax material, adding a silicone oil surfactant and an emulsifier to the melted hydrocarbon wax material and mixing evenly, then adding water with a temperature of ≥90° C. and mixing evenly to obtain a mixed solution; adding an ethanol aqueous solution to the mixed solution and mixing evenly to obtain an emulsion;

[0007] (2) adding the polylactic acid solution to the emulsion prepared in step (1), stirring and mixing at 60° C.-70° C. to obtain the environmentally friendly water-based release agent.

[0008] According to the above preparation method, preferably, the polylactic acid solution is prepared using acetone as solvent, and the mass ratio of polylactic acid to hydrocarbon wax substances in the polylactic acid solution is (0.75-2):1; more preferably, the mass ratio of polylactic acid to hydrocarbon wax substances in the polylactic acid solution is 1:1.

[0009] According to the above preparation method, preferably, the emulsifier is a mixture of Span-80 and Tween-80, and the content of Span-80 in the emulsifier is 50%-60%; more preferably, the content of Span-80 in the emulsifier is 57%.

[0010] According to the above preparation method, preferably, the mass ratio of the total mass of the silicone oil surfactant and emulsifier to the hydrocarbon wax substance is (1.1-1.3):1; more preferably, the mass ratio of the total mass of the silicone oil surfactant and emulsifier to the hydrocarbon wax substance is 1.25:1.

[0011] According to the above preparation method, preferably, the mass ratio of the emulsifier to the silicone oil surfactant is 5:4.

[0012] According to the above preparation method, preferably, the preparation method of the silicone oil surfactant is: epoxy-modified silicone oil, polyetheramine and solvent are evenly mixed, refluxed at 45°C-60°C for 3h-5h, and the solvent is removed after the reaction to obtain the silicone oil surfactant; more preferably, the reflux reaction temperature is 50°C and the reflux reaction time is 4h.

[0013] According to the above preparation method, preferably, the mass ratio of the polyetheramine to the epoxy-modified silicone oil is 1:(4-6); more preferably, the mass ratio of the polyetheramine to the epoxy-modified silicone oil is 1:4.

[0014] According to the above preparation method, preferably, the mass ratio of the solvent to the epoxy-modified silicone oil is 2:(5-10), more preferably, the mass ratio of the solvent to the epoxy-modified silicone oil is 2:5; most preferably, the solvent is toluene.

[0015] According to the above preparation method, preferably, the molecular weight of the polyetheramine is 2000.

[0016] According to the above preparation method, preferably, the volume fraction of the ethanol aqueous solution is 40%-55%, more preferably, the volume fraction of the ethanol aqueous solution is 50%.

[0017] According to the above preparation method, preferably, the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:(4-5), more preferably 1:4.5.

[0018] According to the above preparation method, preferably, the mass fraction of polylactic acid in the polylactic acid solution is 4%-8%, more preferably, the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0019] According to the above preparation method, preferably, the mass ratio of the hydrocarbon wax substance to water is 1:(4-6); more preferably, the mass ratio of the hydrocarbon wax substance to water is 1:5.

[0020] According to the above preparation method, preferably, the hydrocarbon wax material is at least one of palm wax, jojoba wax, and paraffin wax. More preferably, the hydrocarbon wax material is a mixture of palm wax and paraffin wax in a mass ratio of 2:5.

[0021] The present invention also provides an environmentally friendly water-based release agent product prepared using the preparation method described in the first aspect above.

[0022] The present invention also provides the use of the environmentally friendly water-based release agent product described in the second aspect in the processing and molding of polyurethane plastic products.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] (1) The present invention adopts silicone oil surfactant and emulsifier (emulsifier composed of Tween 80 and Span 80) to emulsify and disperse hydrocarbon wax substances, and then mixes them with water. Not only can the hydrocarbon wax substances be evenly dispersed in water to form a stable and uniform emulsion, but the prepared water-based release agent has excellent storage stability, shear stability and thermal stability, and will not experience stratification, demulsification, precipitation and the like during long-term storage. This solves the technical problem that when silicone oil surfactant is used alone to disperse hydrocarbon wax substances, the emulsification is difficult due to the lower surface tension of silicone oil surfactant than that of hydrocarbon wax substances, and the emulsification amount is large, resulting in poor release effect of the prepared release agent.

[0025] (2) The silicone oil surfactant of the present invention is prepared by modifying epoxy-modified silicone oil with polyetheramine. The silicone oil surfactant can not only reduce foaming, but also increase the wettability to the substrate, effectively prevent the prepared release agent from agglomerating, and reduce the impact on the release agent spraying.

[0026] (3) The release agent of the present invention contains polylactic acid, which can form a micro-nano structure during the film formation process of the release agent, thereby helping to reduce the adhesion of polyurethane and enhance the demolding effect. At the same time, hydrocarbon wax substances and polylactic acid act synergistically to adjust the hydrophobic properties of the surface of the water-based release agent, thereby improving the demolding performance of the release agent. The demolding force of the prepared water-based release agent is minimized, and the demolding is complete.

[0027] (4) The ethanol solution is added to the emulsion of the present invention, so that the prepared release agent can be quickly dried to form a film after spraying, so that the unreacted NCO in the polyurethane will not react with the unvolatile water in the release agent to cause incomplete demolding, saving time and not affecting the demolding performance of the release agent.

[0028] (5) The water-based release agent prepared by the present invention does not contain toxic and harmful substances such as fluorine, is green and environmentally friendly, has low preparation cost, and has good demoulding properties. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below by means of specific embodiments. Those skilled in the art should understand that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention. The experimental methods in the following examples, for which specific conditions are not specified, all adopt conventional techniques in the art or follow the conditions recommended by the manufacturer; the reagents or instruments used, for which the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0030] (1) Discussion on the mass ratio of emulsifier and silicone oil surfactant

[0031] In order to understand the influence of the mass ratio of emulsifier to silicone oil surfactant on the performance of the release agent, the present invention has carried out Examples 1 to 2 and Comparative Examples 1 to 2. The specific contents of Examples 1 to 2 and Comparative Examples 1 to 2 are as follows:

[0032] Example 1:

[0033] A method for preparing a water-based release agent, comprising the following specific steps:

[0034] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., a silicone oil surfactant and an emulsifier are added to the melted hydrocarbon wax material, the mixture is evenly mixed, and then water with a temperature of ≥98° C. is added and mixed to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and the emulsifier to the hydrocarbon wax material is 1.25:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0035] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution and mixing the mixture to obtain a water-based release agent, wherein the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0036] In step (1), the silicone oil surfactant is prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing, then refluxing and stirring at 50°C for 4 hours to stop the reaction; after the reaction is completed, the toluene is removed by reduced pressure distillation to obtain a light yellow transparent product, which is the silicone oil surfactant. The molecular weight of the polyetheramine is 2000, the mass ratio of the polyetheramine to the epoxy-modified silicone oil is 1:5, and the mass ratio of toluene to the epoxy-modified silicone oil is 2:5.

[0037] Example 2:

[0038] The content of Example 2 is basically the same as that of Example 1, except that in step (1), the mass ratio of the emulsifier to the silicone oil surfactant is 7:2.

[0039] Comparative Example 1:

[0040] A method for preparing a water-based release agent, comprising the following specific steps:

[0041] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., an emulsifier is added to the melted hydrocarbon wax material, the mixture is evenly mixed, and water with a temperature of ≥98° C. is added and mixed to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the emulsifier to the hydrocarbon wax material is 1.25:1; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0042] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution and mixing the mixture to obtain a water-based release agent, wherein the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0043] Comparative Example 2:

[0044] A method for preparing a water-based release agent, comprising the following specific steps:

[0045] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., a silicone oil surfactant is added to the melted hydrocarbon wax material, the mixture is evenly mixed, and water having a temperature of ≥98° C. is added and mixed to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the silicone oil surfactant to the hydrocarbon wax material is 1.25:1. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0046] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution and mixing the mixture to obtain a water-based release agent, wherein the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0047] In step (1), the preparation of the silicone oil surfactant is the same as that in Example 1.

[0048] In order to study the effect of the mass ratio of emulsifier to silicone oil surfactant on the performance of the prepared release agent, the present invention conducted stability tests and release force performance tests on the release agents prepared in Examples 1 and 2 and Comparative Examples 1 and 2. The specific method of the stability test is as follows:

[0049] (1) Storage stability: The prepared release agent was left at room temperature for 7 days and observed for delamination. If there was no delamination after 7 days, the storage stability was rated as excellent; if there was delamination, the storage stability was rated as good.

[0050] (2) Shear stability: The prepared release agent was diluted 150 times and stirred with a high-speed stirrer at 3000 rpm / min for 10 min. The release agent was observed for demulsification, stratification, precipitation, etc. The absence of demulsification, stratification, precipitation, etc. was scored as excellent storage stability, while the presence of demulsification, stratification, precipitation, etc. was scored as good storage stability.

[0051] (3) Centrifugal stability: The prepared release agent was diluted 150 times and centrifuged at 3000 rpm for 15 min to observe whether the release agent showed demulsification, stratification, or precipitation. The absence of demulsification, stratification, or precipitation was considered excellent storage stability, while the presence of demulsification, stratification, or precipitation was considered good storage stability.

[0052] (4) Thermal stability: The prepared release agent was placed in a test tube and heated and boiled for 10 minutes. The release agent was observed to see if there was any demulsification, stratification, or precipitation. If there was no demulsification, stratification, or precipitation, the storage stability was rated as excellent. If there was any demulsification, stratification, or precipitation, the storage stability was rated as good.

[0053] The demoulding force performance test method is as follows: after spraying the demoulding agent on the stainless steel mold, the stainless steel mold is dried for 40 seconds; then, commercially available polyurethane foam raw materials are mixed in the specified proportion and injected into the mold, and aged at 55°C for 3 minutes. Then, the force required to remove the polyurethane foam mold from the mold is measured using a dynamometer (unit: N / cm2). 2 ).

[0054] The stability test and demoulding force performance test results of the release agents prepared in Examples 1 to 2 and Comparative Examples 1 to 2 are shown in Table 1 (the test results in Table 1 are the average values ​​of multiple experiments). Table 1 shows the stability test and demoulding force performance test results of the release agents prepared in Examples 1 to 2 and Comparative Examples 1 to 2.

[0055]

[0056] As can be seen from Table 1, when the silicone oil surfactant is used alone, the prepared release agent has poor stability (Comparative Example 2), and a uniform and stable release agent cannot be formed. Moreover, the release agent cannot form a uniform film on the surface of the stainless steel mold after spraying (resulting in the inability to detect the demoulding force), and cannot be used as a release agent in the processing and molding of polyurethane plastic products. This result also shows that polyurethane shows that the use of silicone oil surfactant alone cannot effectively emulsify hydrocarbon wax substances; when the emulsifier is used alone, the prepared release agent has good stability, but the demoulding force is large and the demoulding effect is poor (Comparative Example 1). When the emulsifier and the silicone oil surfactant are mixed in a certain proportion, the prepared release agent has good stability and a small demoulding force, indicating that the emulsifier and the silicone oil surfactant are compounded, and the obtained emulsifier has both good emulsification effect and demoulding performance. Moreover, when the mass ratio of the emulsifier to the silicone oil surfactant is 5:4, the demoulding force is the smallest, reaching 45N / Cm 2 Therefore, the mass ratio of emulsifier to silicone oil surfactant is preferably 5:4.

[0057] (2) Discussion on the mass ratio of polylactic acid and hydrocarbon wax substances

[0058] In order to understand the influence of the mass ratio of polylactic acid to hydrocarbon wax on the performance of the release agent, the present invention carried out Examples 3 to 6 and Comparative Example 3. The specific contents of Examples 3 to 6 and Comparative Example 3 are as follows:

[0059] Example 3:

[0060] A method for preparing a water-based release agent, comprising the following specific steps:

[0061] (1) Heat 22.5g of hydrocarbon wax material at 90-100℃ to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix well, then add water with a temperature of ≥98℃, stir while adding, and mix well to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and emulsifier to the hydrocarbon wax material is 1.25:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0062] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:5; the mass ratio of toluene to epoxy-modified silicone oil was 2:5.

[0063] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution, stirring while adding, and mixing to obtain an emulsifier; the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0064] (3) Adding the polylactic acid solution to the emulsion prepared in step (2), stirring and mixing at 65° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 0.75:1; and the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0065] Example 4:

[0066] The content of Example 4 is the same as that of Example 1, except that in step (3), the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1.

[0067] Example 5:

[0068] The content of Example 5 is the same as that of Example 1, except that in step (3), the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1.5:1.

[0069] Example 6:

[0070] The content of Example 6 is the same as that of Example 1, except that in step (3), the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 2:1.

[0071] Comparative Example 3:

[0072] The content of Comparative Example 3 is the same as that of Example 1, except that in step (3), the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 2.5:1.

[0073] In order to study the effect of the mass ratio of emulsifier to silicone oil surfactant on the performance of the prepared release agent, the present invention conducted stability tests and demolding force performance tests on the release agents prepared in Examples 3 to 6 and Comparative Examples 3 to 4, and the results are shown in Table 2.

[0074] Table 2 shows the stability test and demoulding force performance test results of the release agents prepared in Examples 3 to 6 and Comparative Example 3.

[0075]

[0076] As shown in Table 2, compared with Example 1, the demoulding force of the release agent prepared in Example 3-Example 6 and Comparative Example 3 is significantly reduced, indicating that adding an appropriate proportion of polylactic acid can effectively improve the demoulding effect of the release agent; however, it is not the case that the more polylactic acid is added, the better. When the mass ratio of polylactic acid to hydrocarbon wax substances is (0.75-2): 1, the prepared release agent has good stability, small demoulding force, and good demoulding effect. When the amount of polylactic acid is further increased, the stability and demoulding performance of the prepared release agent deteriorate, indicating that excessive addition of polylactic acid will affect the stability of the release agent and reduce the demoulding effect of the release agent. Therefore, the mass ratio of polylactic acid to hydrocarbon wax substances is preferably (0.75-2): 1, and more preferably 1: 1.

[0077] (III) Discussion on the influence of adding ethanol aqueous solution on the release performance of release agent:

[0078] In order to study the effect of adding ethanol aqueous solution on the performance of the release agent, the present invention carried out comparative example 4, and the specific content of comparative example 4 is as follows:

[0079] Comparative Example 4:

[0080] A method for preparing a water-based release agent, comprising the following specific steps:

[0081] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., a silicone oil surfactant and an emulsifier are added to the melted hydrocarbon wax material, the mixture is evenly mixed, and then water with a temperature of ≥98° C. is added and mixed to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and the emulsifier to the hydrocarbon wax material is 1.25:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0082] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:5; the mass ratio of toluene to epoxy-modified silicone oil was 2:5.

[0083] (2) Adding the polylactic acid solution to the emulsion prepared in step (1), stirring and mixing at 65° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; and the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0084] In order to study the effect of adding ethanol solution on the performance of the prepared release agent, the present invention conducted stability tests and demoulding force performance tests on the release agents prepared in Example 4 and Comparative Example 4, and the results are shown in Table 3.

[0085] Table 3 shows the stability test and demoulding force performance test results of the release agents prepared in Example 4 and Comparative Example 4

[0086]

[0087] As shown in Table 3, the stability and demolding force of the release agent prepared without adding ethanol aqueous solution are no different from those prepared with adding ethanol solution, indicating that ethanol aqueous solution can shorten the film-forming and drying time of the water-based release agent without affecting the stability and demolding force of the water-based release agent.

[0088] Example 5:

[0089] A method for preparing a water-based release agent, comprising the following specific steps:

[0090] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., a silicone oil surfactant and an emulsifier are added to the melted hydrocarbon wax material, the mixture is evenly mixed, and water with a temperature of ≥98° C. is added while stirring to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and jojoba wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and the emulsifier to the hydrocarbon wax material is 1.25:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0091] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:5; the mass ratio of toluene to epoxy-modified silicone oil was 2:5.

[0092] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution, stirring while adding, and mixing to obtain an emulsifier; the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0093] (3) Adding the polylactic acid solution to the emulsion prepared in step (2), stirring and mixing at 65° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; and the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0094] Example 6:

[0095] A method for preparing a water-based release agent, comprising the following specific steps:

[0096] (1) 22.5 g of hydrocarbon wax material is heated and melted at 90-100° C., a silicone oil surfactant and an emulsifier are added to the melted hydrocarbon wax material, the mixture is evenly mixed, and water with a temperature of ≥98° C. is added while stirring to obtain a mixed solution. The hydrocarbon wax material is carnauba wax. The mass ratio of the total mass of the silicone oil surfactant and the emulsifier to the hydrocarbon wax material is 1.1:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 57%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0097] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:5; the mass ratio of toluene to epoxy-modified silicone oil was 2:5.

[0098] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution, stirring while adding, and mixing to obtain an emulsifier; the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.

[0099] (3) Adding the polylactic acid solution to the emulsion prepared in step (2), stirring and mixing at 60° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; and the mass fraction of polylactic acid in the polylactic acid solution is 8%.

[0100] Example 7:

[0101] A method for preparing a water-based release agent, comprising the following specific steps:

[0102] (1) Heat 22.5g of hydrocarbon wax material at 90-100℃ to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix well, then add water with a temperature of ≥98℃, stir while adding, and mix well to obtain a mixed solution. The hydrocarbon wax material is a mixture of jojoba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and emulsifier to the hydrocarbon wax material is 1.3:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 50%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0103] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:4; the mass ratio of toluene to epoxy-modified silicone oil was 2:10.

[0104] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution, stirring while adding, and mixing to obtain an emulsifier; the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:5.

[0105] (3) Adding the polylactic acid solution to the emulsion prepared in step (2), stirring and mixing at 70° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; and the mass fraction of polylactic acid in the polylactic acid solution is 4%.

[0106] Example 8:

[0107] A method for preparing a water-based release agent, comprising the following specific steps:

[0108] (1) Heat 22.5g of hydrocarbon wax material at 90-100℃ to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix evenly, then add water with a temperature of ≥98℃, stir while adding, and mix evenly to obtain a mixed solution. The hydrocarbon wax material is a mixture of carnauba wax and paraffin wax in a mass ratio of 2:5. The mass ratio of the total mass of the silicone oil surfactant and emulsifier to the hydrocarbon wax material is 1.2:1; the mass ratio of the emulsifier to the silicone oil surfactant is 5:4; the emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 60%. The mass ratio of the hydrocarbon wax material to water is 1:5.

[0109] The silicone oil surfactant was prepared by adding 20g of epoxy-modified silicone oil, polyetheramine, and toluene to a 250mL three-necked flask equipped with a reflux condenser, stirring and mixing until uniform, then refluxing at 50°C with stirring for 4 hours to terminate the reaction. After the reaction, the toluene was removed by vacuum distillation to obtain a light yellow, transparent product. The polyetheramine had a molecular weight of 2000, and the mass ratio of polyetheramine to epoxy-modified silicone oil was 1:6; the mass ratio of toluene to epoxy-modified silicone oil was 2:5.

[0110] (2) adding 50% by volume of an ethanol aqueous solution to the mixed solution, stirring while adding, and mixing to obtain an emulsifier; the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:4.5.

[0111] (3) Adding the polylactic acid solution to the emulsion prepared in step (2), stirring and mixing at 65° C., thereby obtaining the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, wherein the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; and the mass fraction of polylactic acid in the polylactic acid solution is 5%.

[0112] Example 9:

[0113] The content of Example 9 is substantially the same as that of Example 4, except that in step (1), the hydrocarbon wax substance is jojoba wax, and the content of Span 80 in the emulsifier is 52%.

[0114] Example 10:

[0115] The content of Example 10 is substantially the same as that of Example 4, except that in step (1), the hydrocarbon wax substance is paraffin.

[0116] The above embodiments are specific implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other combination, change, modification, substitution, and simplification that does not exceed the design concept of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing an environmentally friendly water-based release agent, characterized in that: The steps include: (1) heating and melting a hydrocarbon wax material, adding a silicone oil surfactant and an emulsifier to the melted hydrocarbon wax material and mixing them evenly, then adding water with a temperature of ≥90°C and mixing them evenly to obtain a mixed solution; adding an ethanol aqueous solution to the mixed solution and mixing them evenly to obtain an emulsion; (2) adding the polylactic acid solution to the emulsion prepared in step (1), stirring and mixing at 60° C.-70° C. to obtain the environmentally friendly water-based release agent; The preparation method of the silicone oil surfactant comprises: uniformly mixing epoxy modified silicone oil, polyetheramine and solvent, refluxing at 45-60° C. for 3-5 hours, and removing the solvent after the reaction to obtain the silicone oil surfactant; The mass ratio of the polyetheramine to the epoxy-modified silicone oil is 1:(4-6), the mass ratio of the solvent to the epoxy-modified silicone oil is 2:(5-10), and the molecular weight of the polyetheramine is 2000; The volume fraction of the ethanol aqueous solution is 40%-55%, the mass ratio of the ethanol aqueous solution to the hydrocarbon wax substance is 1:(4-5); the mass fraction of polylactic acid in the polylactic acid solution is 4%-8%; the mass ratio of the hydrocarbon wax substance to water is 1:(4-6); the hydrocarbon wax substance is at least one of palm wax, jojoba wax, and paraffin wax.

2. The preparation method according to claim 1, characterized in that The polylactic acid solution is prepared using acetone as a solvent, and the mass ratio of polylactic acid to hydrocarbon wax substances in the polylactic acid solution is (0.75-2):

1.

3. The preparation method according to claim 1 or 2, characterized in that The emulsifier is a mixture of Span 80 and Tween 80, and the content of Span 80 in the emulsifier is 50%-60%.

4. The preparation method according to claim 3, characterized in that The mass ratio of the total mass of the silicone oil surfactant and the emulsifier to the mass of the hydrocarbon wax substance is (1.1-1.3):

1.

5. The preparation method according to claim 4, characterized in that The mass ratio of the emulsifier to the silicone oil surfactant is 5:

4.

6. An environmentally friendly water-based release agent product prepared by the preparation method according to any one of claims 1 to 5.

7. Use of the environmentally friendly water-based release agent product according to claim 6 in the processing and molding of polyurethane plastic products.

Images