Preparation method of environment-friendly water-based release agent as well as product prepared by preparation method and application of product

Abstract

The invention belongs to the technical field of release agents, and particularly relates to a preparation method of an environment-friendly water-based release agent, a product prepared through the preparation method and application of the product. The preparation method of the environment-friendly water-based release agent comprises the following steps: (1) heating and melting the hydrocarbon wax substance, adding the silicone oil surfactant and the emulsifier into the molten hydrocarbon wax substance, uniformly mixing, then adding water of which the temperature is greater than or equal to 90 DEG C, and uniformly mixing to obtain a mixed solution; adding an ethanol water solution into the mixed solution, and uniformly mixing to obtain an emulsion; and (2) adding a polylactic acid solution into the emulsion, and uniformly stirring and mixing at 60-70 DEG C to obtain the environment-friendly water-based release agent. The water-based release agent prepared by the preparation method disclosed by the invention is green and environment-friendly, low in preparation cost and good in release property.

Description

Technical Field

[0001] The 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 kind of polymer synthetic material with a wide range of applications. Its raw materials and proportions are diverse, so its performance is unique and widely used. Polyurethane foam plastics are the main varieties of polyurethane products, and its output accounts for more than half of the total polyurethane products. In the molding process of polyurethane foam plastic products, high temperature hot pressing is required. The mold materials used are generally high thermal conductivity materials, such as aluminum, steel, etc. However, since the isocyanate component in the polyurethane foaming raw material has adhesive properties and will produce a strong bonding effect with the metal, it is necessary to use a suitable release agent to prevent the adhesion of polyurethane foam products to the mold, to prevent the foam skin from being torn during demolding, and to damage the surface quality of the foam. Commonly used release agents include oily release agents and water-based release agents; existing oily release agents contain organic volatile substances and pollute the environment; existing water-based release agents mostly contain fluorine-containing substances, which pollute the environment greatly, and there are also problems such as multiple spraying, easy agglomeration, and difficult dispersion, and slow water evaporation, which reduces the production efficiency of polyurethane plastic products. Therefore, it is urgent to study a water-based release agent with good demolding effect and environmental protection. 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, 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 emulsified solution;

[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 the 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 the 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: evenly mix the epoxy modified silicone oil, polyether amine and solvent, reflux reaction at 45°C-60°C for 3h-5h, remove the solvent after the reaction, and 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%, and 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 by the preparation method described in the first aspect.

[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 technical effects achieved by the present invention are as follows:

[0024] (1) The present invention uses silicone oil surfactant and emulsifier (emulsifier composed of Tween 80 and Span 80) to emulsify and disperse hydrocarbon wax substances, and then mix 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 surface tension of silicone oil surfactant is lower than that of hydrocarbon wax substances, resulting in great difficulty in emulsification and a large amount of emulsification, 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-forming 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 work synergistically to adjust the hydrophobic properties of the surface of the water-based release agent and improve the demolding performance of the release agent. The demolding force of the prepared water-based release agent is minimal, and the demolding is complete.

[0027] (4) The emulsion of the present invention contains an ethanol solution, 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, thereby 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 a low preparation cost, and has good demoulding properties. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme of the present invention is further described below by specific implementation methods. Those skilled in the art should understand that the embodiments are only 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 that do not specify specific conditions are all based on conventional techniques in the art, or according to the conditions recommended by the manufacturer; the reagents or instruments used that do not specify the manufacturer are all conventional products that can be purchased commercially.

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

[0031] In order to determine the effect of the mass ratio of the emulsifier to the 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] Embodiment 1:

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

[0034] (1) Heat 22.5g of hydrocarbon wax material at 90-100°C to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix well, then add water with a temperature of ≥98°C 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 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 ethanol aqueous solution to the mixed solution, mixing well, and obtaining 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 evenly, then refluxing and stirring at 50°C for 4h to stop the reaction; after the reaction is completed, 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] Embodiment 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) Heat 22.5g of hydrocarbon wax material at 90-100°C to melt, add emulsifier to the melted hydrocarbon wax material, mix evenly, then add water with a temperature of ≥98°C, 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 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 ethanol aqueous solution to the mixed solution, mixing well, and obtaining 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 ethanol aqueous solution to the mixed solution, mixing well, and obtaining 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 to 2 and Comparative Examples 1 to 2. The specific method of the stability test is:

[0049] (1) Storage stability: The prepared release agent was left at room temperature for 7 days to observe whether there was stratification. If there was no stratification after 7 days, the storage stability was excellent, and if there was stratification, the storage stability was good.

[0050] (2) Shear stability: After the prepared release agent was diluted 150 times, it was stirred with a high-speed stirrer at 3000 rpm / min for 10 min to observe whether the release agent had demulsification, stratification, precipitation, etc. Among them, if there was no demulsification, stratification, precipitation, etc., the storage stability was excellent, and if there was demulsification, stratification, precipitation, etc., the storage stability was good.

[0051] (3) Centrifugal stability: The prepared release agent was diluted 150 times and centrifuged at 3000 rpm / min for 15 min to observe whether the release agent has demulsification, stratification, precipitation, etc. Among them, if there is no demulsification, stratification, or precipitation, the storage stability is excellent, and if there is demulsification, stratification, or precipitation, the storage stability is good.

[0052] (4) Thermal stability: The prepared release agent was placed in a test tube and heated and boiled for 10 min to observe whether the release agent had demulsification, stratification, precipitation, etc. Among them, if there was no demulsification, stratification, or precipitation, the storage stability was excellent, and if there was demulsification, stratification, or precipitation, the storage stability was 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, the commercially available raw materials for polyurethane foam are mixed in a specified proportion and injected into the mold, and aged at 55°C for 3 minutes, and then the force (in N / cm2) required to remove the polyurethane foam mold from the mold is measured with an elastic meter. 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] It can be seen from Table 1 that 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 the emulsifier to the silicone oil surfactant is preferably 5:4.

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

[0058] In order to determine the effect of the mass ratio of polylactic acid to hydrocarbon wax on the performance of the release agent, the present invention has 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] Embodiment 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 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.

[0062] The preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. 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.

[0063] (2) adding 50% by volume of ethanol aqueous solution to the mixed solution, stirring 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., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 0.75:1; the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0065] Embodiment 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] Embodiment 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] Embodiment 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 demoulding agent prepared in Examples 3-6 and Comparative Example 3 is significantly reduced, indicating that adding an appropriate proportion of polylactic acid can effectively improve the demoulding effect of the demoulding 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 demoulding 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 demoulding agent deteriorate, indicating that adding too much polylactic acid will affect the stability of the demoulding agent and reduce the demoulding effect of the demoulding 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) Heat 22.5g of hydrocarbon wax material at 90-100°C to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix well, then add water with a temperature of ≥98°C 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 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 preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. 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.

[0083] (2) Adding the polylactic acid solution to the emulsion prepared in step (1), stirring and mixing at 65° C., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, 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 test and demolding force performance test 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 with adding ethanol solution, which shows that ethanol aqueous solution can shorten the film-forming and drying time of the water-based release agent and does not affect the stability and demolding force of the water-based release agent.

[0088] Embodiment 5:

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

[0090] (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 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 preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. 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.

[0092] (2) adding 50% by volume of ethanol aqueous solution to the mixed solution, stirring 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., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, the mass ratio of polylactic acid to hydrocarbon wax in the polylactic acid solution is 1:1; the mass fraction of polylactic acid in the polylactic acid solution is 6%.

[0094] Embodiment 6:

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

[0096] (1) Heat 22.5g of hydrocarbon wax material at 90-100°C to melt, add silicone oil surfactant and emulsifier to the melted hydrocarbon wax material, mix well, then add water with a temperature of ≥98°C, stir while adding, and mix well to obtain a mixed solution. Wherein, 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 preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. 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.

[0098] (2) adding 50% by volume of ethanol aqueous solution to the mixed solution, stirring 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., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, 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] Embodiment 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 the 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 preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. The molecular weight of the polyetheramine is 2000, the mass ratio of the polyetheramine to the epoxy modified silicone oil is 1:4, and the mass ratio of toluene to the epoxy modified silicone oil is 2:10.

[0104] (2) adding 50% by volume of ethanol aqueous solution to the mixed solution, stirring 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., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, 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] Embodiment 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 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 the 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 preparation of the silicone oil surfactant is as follows: 20g of epoxy modified silicone oil, polyetheramine and toluene are added to a 250mL three-necked flask equipped with a reflux condenser, stirred and mixed evenly, then refluxed and stirred at 50°C for 4h to stop the reaction; after the reaction is completed, toluene is removed by reduced pressure distillation to obtain a light yellow transparent product. The molecular weight of the polyetheramine is 2000, the mass ratio of the polyetheramine to the epoxy modified silicone oil is 1:6, and the mass ratio of toluene to the epoxy modified silicone oil is 2:5.

[0110] (2) adding 50% by volume of ethanol aqueous solution to the mixed solution, stirring 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., to obtain the environmentally friendly water-based release agent. The polylactic acid solution is prepared by dissolving polylactic acid in acetone, 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] Embodiment 9:

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

[0114] Embodiment 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 protection scope 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 evenly, then adding water at a temperature of ≥90°C and mixing evenly to obtain a mixed liquid; adding an ethanol aqueous solution to the mixed liquid and mixing evenly to obtain an emulsified liquid; (2) Adding the polylactic acid solution to the emulsion prepared in step (1), stirring and mixing at 60° C.-70° C., thereby obtaining the environmentally friendly water-based release agent.

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. The preparation method according to claim 5, characterized in that: The preparation method of the silicone oil surfactant is as follows: epoxy modified silicone oil, polyether amine and solvent are uniformly mixed, refluxed at 45-60° C. for 3h-5h, and after the reaction is completed, the solvent is removed to obtain the silicone oil surfactant.

7. The preparation method according to claim 6, characterized in that: 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.

8. The preparation method according to claim 7, characterized in that: The volume fraction of the ethanol aqueous solution is 40%-55%, and 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.

9. An environmentally friendly water-based release agent product prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the environmentally friendly water-based release agent product according to claim 9 in the processing and molding of polyurethane plastic products.

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