A high-stability green sand mold release agent and its preparation method

Abstract

The present invention relates to the technical field of B22C3 / 00, and particularly relates to a high-stability green sand mold release agent and a preparation method thereof. A high-stability green sand mold release agent, by weight, the preparation raw materials include: 2.5-3.5 parts of an emulsifier, 2-4 parts of ethylene base oil, 90-95 parts of solvent oil, 0.1-2 parts of methyl silicone oil, and 10-20 parts of water. The high-stability green sand mold release agent prepared by the present invention has the technical effects of no odor, high adhesion, no delamination, and no residue on the surface of the processed product.

Description

Technical Field

[0001] The present invention relates to the technical field of B22C3 / 00, and particularly relates to a wet sand mold release agent with high stability and a preparation method thereof. Background Art

[0002] Wet sand mold release agents are generally used in the casting and forging industries for shot peening of large and medium-sized parts, such as processing of brake pads, brake hubs, flange parts, cylinder blocks, etc., and are particularly suitable for mass production on production lines. However, the currently prepared wet sand mold release agents still have problems such as easy stratification, poor demolding effect, poor adhesion, and low dimensional accuracy.

[0003] Chinese Patent with application number CN201610856650.5 discloses a mold release agent containing methyl silicone oil and a preparation method thereof, which uses methyl silicone oil and white oil as the interfacial substances between the mold and the finished product, but does not disclose a solution to the technical problems of the stability and demolding uniformity of the mold release agent.

[0004] Therefore, providing a wet sand mold release agent with high stability that is not prone to stratification, has a good demolding effect, and good demolding uniformity is a problem that needs to be solved currently. Summary of the Invention

[0005] To solve the above problems, the present invention provides a wet sand mold release agent with high stability. Calculated by weight, the preparation raw materials include: 2.5 - 3.5 parts of emulsifier, 2 - 4 parts of ethylene base oil, 90 - 95 parts of solvent oil, 0.1 - 2 parts of methyl silicone oil, and 10 - 20 parts of water.

[0006] Preferably, the water is purified water.

[0007] The inventor found in experiments that when water is used in combination with other raw materials, it is necessary to control the addition amount, and the content and quality of water affect the viscosity of the system. When the water content is high, it is easy to cause the problem of sand sticking, resulting in a poor demolding effect. Moreover, using natural water will cause the problem of water-oil separation. The possible reason is that natural water contains different impurities, and the impurities affect the stability of the mold release agent system, resulting in the problem of water-oil separation.

[0008] Emulsifier : An emulsifier generally refers to a class of substances that can form a stable emulsion from a mixed liquid composed of two or more immiscible substances.

[0009] Preferably, the emulsifier is selected from one or more of oleic acid, sodium alkylbenzene sulfonate, methyl linoleate, and ethyl oleate.

[0010] Furthermore, the emulsifier is oleic acid.

[0011] The molecular structure of the oleic acid is a cis structure, and the purchasing manufacturer of the oleic acid is Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0012] The inventor found in the experiment that by using oleic acid with a cis structure as an emulsifier and cooperating with ethylene base oil, solvent oil and methyl silicone oil, the storage stability of the wet sand release agent can be improved, and the problem of strong odor of the wet sand release agent can be solved.

[0013] Preferably, the viscosity of the ethylene base oil at 40 °C is 100 - 300 cSt.

[0014] Further, the viscosity of the ethylene base oil at 40 °C is 150 - 260 cSt.

[0015] Preferably, the ethylene base oil is vinyl silicone oil.

[0016] Preferably, the molar percentage content of vinyl in the vinyl silicone oil is 1 - 4 mol%.

[0017] Further, the molar percentage content of vinyl in the vinyl silicone oil is 1.2 - 3 mol%.

[0018] Further, the vinyl silicone oil is end - vinyl silicone oil, the viscosity of the end - vinyl silicone oil is 200 cSt, the molar percentage content of vinyl in the end - vinyl silicone oil is 1.9 mol%, and the purchasing manufacturer of the end - vinyl silicone oil is Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd.

[0019] Preferably, the viscosity of the solvent oil at 40 °C is 3 - 4 cSt.

[0020] Preferably, the solvent oil is petroleum ether and / or white oil.

[0021] Further, the solvent oil is white oil.

[0022] Further, the viscosity of the white oil at 40 °C is 3.0 - 3.1 cSt, and the purchasing manufacturer of the white oil with a viscosity of 3.0 - 3.1 cSt is Zibo Xinjiu Rubber Auxiliary Co., Ltd., and the model is 3#.

[0023] The inventor found in experiments that when using white oil with a viscosity of 3 - 4 cSt, especially when using white oil with a viscosity of 3.0 - 3.1 cSt in combination with ethylene base oil with a viscosity of 100 - 300 cSt and methyl silicone oil with a viscosity of 2500 - 3500 cSt, the clogging of the nozzle will be reduced, the spraying will be uniform, and the demoulding effect will be good. When the viscosity of the white oil is high, it will affect the viscosity of the demoulding agent system, stick to the nozzle and cause clogging, resulting in uneven spraying; when the viscosity of the white oil is too low, the interaction network with the ethylene base oil will be reduced, resulting in a decrease in the viscosity of the demoulding agent system, poor adhesion of the demoulding agent, and affecting the demoulding effect.

[0024] Preferably, the viscosity of the methyl silicone oil at 40 °C is 2500 - 3500 cSt.

[0025] Preferably, the viscosity of the methyl silicone oil at 40 °C is 2800 - 3200 cSt.

[0026] Furthermore, the viscosity of the methyl silicone oil at 40 °C is 2800 - 3000 cSt, and the methyl silicone oil is purchased from Aladdin in China, with the model PMX - 200.

[0027] The inventor found in experiments that when preparing a green sand demoulding agent by using methyl silicone oil with a viscosity of 2500 - 3500 cSt in combination with white oil with a viscosity of 3.0 - 3.1 cSt and vinyl-terminated silicone oil with a viscosity of 200 cSt and a molar percentage content of vinyl of 1.9 mol%, the adhesion of the green sand demoulding agent to the mold can be improved, and the demoulding effect can be improved. When the viscosity of the methyl silicone oil is too high, there will be residues on the mold, affecting the dimensional accuracy of the processed product; when the viscosity of the methyl silicone oil is too low, the adhesion of the green sand demoulding agent to the mold will be poor, thus affecting the surface brightness of the product, resulting in an average demoulding effect of the product, and the number of demoulded products will be limited after spraying the demoulding agent once.

[0028] The second aspect of the present invention provides a preparation method of a green sand demoulding agent with high stability, including the following steps:

[0029] S1. Add water, emulsifier, ethylene base oil, solvent oil, and methyl silicone oil into a homogenizer in sequence and stir to obtain mixture A;

[0030] S2. Add pigment into mixture A and stir for 2 - 20 min to obtain a green sand demoulding agent with high stability.

[0031] Preferably, the stirring time required in S1 is 20 - 40 min.

[0032] The inventor found in experiments that by selecting vinyl silicone oil, especially vinyl silicone oil with a viscosity of 100 - 300 cSt and a molar percentage content of vinyl of 1 - 4 mol%, especially end - vinyl silicone oil with a viscosity of 150 - 260 cSt and a molar percentage content of vinyl of 1.2 - 3 mol%, and particularly vinyl silicone oil with a viscosity of 200 cSt and a molar percentage content of vinyl of 1.9 mol%, and using it in combination with oleic acid and methyl silicone oil with a viscosity of 2500 - 3500 cSt, after stirring for 20 - 40 min, the functional groups contained in the end - vinyl silicone oil can fully interact with the functional groups contained in oleic acid and methyl silicone oil, generating a certain interaction force, and can be evenly emulsified during the stirring process, avoiding stratification, improving the stability of the green sand mold release agent, and avoiding the problem of uneven spraying film during the use of the green sand mold release agent.

[0033] Beneficial effects

[0034] In the present invention, by using oleic acid with a cis - structure as an emulsifier, the problem of strong odor of the green sand mold release agent with high stability can be improved.

[0035] In the present invention, by limiting the viscosity and type of solvent oil, the problems of poor adhesion, poor demoulding property, nozzle blockage, and uneven spraying of the green sand mold release agent can be improved.

[0036] In the present invention, by limiting the viscosity of methyl silicone oil, the adhesion of the green sand mold release agent to the mold can be improved, and the number of processing times of the product after spraying the green sand mold release agent with high stability can be increased.

[0037] In the present invention, by limiting the type of water used and the stirring time, the stability of the green sand mold release agent with high stability is improved, stratification is avoided, and the problem of uneven spraying film during the use of the green sand mold release agent is avoided. Specific embodiments

[0038] Example 1

[0039] A green sand mold release agent with high stability, by weight, the preparation raw materials include: 2.8 parts of emulsifier, 3.2 parts of ethylene base oil, 92.5 parts of solvent oil, 0.9 part of methyl silicone oil, and 16 parts of water.

[0040] The water is purified water.

[0041] The emulsifier is oleic acid.

[0042] The molecular structure of the oleic acid is a cis - structure, and the manufacturer from which the oleic acid is purchased is Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0043] The vinyl silicone oil is end - vinyl silicone oil. The viscosity of the end - vinyl silicone oil at 40°C is 200 cSt. The molar percentage content of vinyl in the end - vinyl silicone oil is 1.9 mol%. The purchasing manufacturer of the end - vinyl silicone oil is Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd.

[0044] The solvent oil is white oil.

[0045] The purchasing manufacturer of the white oil is Zibo Xinjiu Rubber Auxiliary Co., Ltd., and the model is 3#.

[0046] The purchasing manufacturer of the methyl silicone oil is Aladdin China, and the model is PMX - 200.

[0047] In the second aspect of this embodiment, a preparation method of a high - stability green sand release agent is provided, including the following steps:

[0048] S1. By weight, 16 parts of water, 2.8 parts of emulsifier, 3.2 parts of ethylene base oil, 92.5 parts of solvent oil, and 0.9 part of methyl silicone oil are sequentially added to a homogenizer and stirred to obtain mixture A;

[0049] S2. 0.006 part of pigment is added to mixture A and stirred for 15 min to obtain a high - stability green sand release agent.

[0050] The purchasing manufacturer and color of the pigment in S2 are not limited.

[0051] The stirring time required in S1 is 30 min.

[0052] Example 2

[0053] A high - stability green sand release agent, by weight, the preparation raw materials include: 3.5 parts of emulsifier, 4 parts of ethylene base oil, 95 parts of solvent oil, 2 parts of methyl silicone oil, and 20 parts of water.

[0054] The water is purified water.

[0055] The emulsifier is oleic acid.

[0056] The molecular structure of the oleic acid is a cis structure. The purchasing manufacturer of the oleic acid is Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0057] The vinyl silicone oil is end - vinyl silicone oil. The viscosity of the end - vinyl silicone oil at 40°C is 200 cSt. The molar percentage content of vinyl in the end - vinyl silicone oil is 1.9 mol%. The purchasing manufacturer of the end - vinyl silicone oil is Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd.

[0058] The solvent oil is white oil.

[0059] The purchasing manufacturer of the white oil is Zibo Xinjiu Rubber Auxiliary Co., Ltd., and the model is 3#.

[0060] The purchasing manufacturer of the methyl silicone oil is Aladdin China, and the model is PMX-200.

[0061] The second aspect of this embodiment provides a preparation method of a high-stability green sand release agent, including the following steps:

[0062] S1. By weight, add 20 parts of water, 3.5 parts of emulsifier, 4 parts of ethylene base oil, 95 parts of solvent oil, and 2 parts of methyl silicone oil into a homogenizer in sequence and stir to obtain mixture A;

[0063] S2. Add 0.008 parts of pigment into mixture A and stir for 20 min to obtain a high-stability green sand release agent.

[0064] The purchasing manufacturer and color of the pigment in S2 are not limited.

[0065] The stirring time required in S1 is 40 min.

[0066] Example 3

[0067] A high-stability green sand release agent, by weight, the preparation raw materials include: 2.5 parts of emulsifier, 2 parts of ethylene base oil, 90 parts of solvent oil, 0.5 parts of methyl silicone oil, and 15 parts of water.

[0068] The water is purified water.

[0069] The emulsifier is oleic acid.

[0070] The molecular structure of the oleic acid is a cis structure, and the purchasing manufacturer of the oleic acid is Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0071] The vinyl silicone oil is end-vinyl silicone oil. The viscosity of the end-vinyl silicone oil at 40 °C is 200 cSt, and the molar percentage content of vinyl in the end-vinyl silicone oil is 1.9 mol%. The purchasing manufacturer of the end-vinyl silicone oil is Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd.

[0072] The solvent oil is white oil.

[0073] The purchasing manufacturer of the white oil is Zibo Xinjiu Rubber Auxiliary Co., Ltd., and the model is 3#.

[0074] The purchasing manufacturer of the methyl silicone oil is Aladdin China, and the model is PMX-200.

[0075] The second aspect of this embodiment provides a preparation method of a high-stability green sand release agent, including the following steps:

[0076] S1. By weight, add 15 parts of water, 2.5 parts of emulsifier, 2 parts of ethylene base oil, 90 parts of solvent oil, and 0.5 part of methyl silicone oil into a homogenizer in sequence and stir to obtain mixture A;

[0077] S2. Add 0.004 part of pigment into mixture A and stir for 10 min to obtain a high-stability green sand mold release agent.

[0078] The purchase manufacturer and color of the pigment in S2 are not limited.

[0079] The stirring time required in S1 is 30 min.

[0080] Example 4

[0081] Example 4 provides a high-stability green sand mold release agent, which is different from Example 1 in that the viscosity of the methyl silicone oil at 40 °C is 1000 cSt, and the purchase manufacturer is Guangzhou Sijia Chemical Co., Ltd.

[0082] Example 5

[0083] Example 5 provides a high-stability green sand mold release agent, which is different from Example 1 in that 16 parts of natural water are used, and the natural water is natural river water.

[0084] Example 6

[0085] Example 6 provides a high-stability green sand mold release agent, which is different from Example 1 in that the viscosity of the methyl silicone oil at 40 °C is 12500 cSt, and the purchase manufacturer is Guangzhou Sijia Chemical Co., Ltd.

[0086] Example 7

[0087] Example 7 provides a high-stability green sand mold release agent, which is different from Example 1 in that the viscosity of the white oil at 40 °C is 32 cSt, the purchase manufacturer of the white oil is Zibo Xinjiu Rubber Auxiliary Co., Ltd., and the model is 32#.

[0088] Performance test

[0089] 1. Stability test

[0090] Place the high-stability green sand mold release agents prepared in Examples 1-7 in an oven at 45 °C for 24 h, take them out and observe the stability state of the green sand mold release agents, and record whether there is a layering situation. The test results are shown in Table 1.

[0091] 2. Demoulding property test

[0092] The high-stability green sand release agents without delamination prepared in Examples 1-7 were applied to the demolding of metal parts with dimensions of 30*30*1.5 cm. The spraying uniformity of the green sand release agent on the mold surface was recorded, including the number of times the metal parts could be continuously processed after one spraying (the number of times the release agent was sprayed once on the mold and the metal parts could be continuously processed to prepare metal parts with a flat surface, no sand sticking, and no dimensional defects), and whether there were residues on the surface of the metal parts. The test results are shown in Table 1.

[0093] Table 1

[0094]

Claims

1. A high-stability release agent for green sand, characterized in that, by weight, the raw materials for preparation include: 2.5 - 3.5 parts of emulsifier, 2 - 4 parts of ethylene base oil, 90 - 95 parts of solvent oil, 0.1 - 2 parts of methyl silicone oil, and 10 - 20 parts of water; the water is purified water; the viscosity of the ethylene base oil at 40 °C is 100 - 300 cSt; the ethylene base oil is vinyl silicone oil; the viscosity of the methyl silicone oil at 40 °C is 2500 - 3500 cSt; the emulsifier is oleic acid.

2. The high-stability release agent for green sand according to claim 1, characterized in that, the molar percentage content of vinyl in the vinyl silicone oil is 1 - 4 mol%.

3. The high-stability release agent for green sand according to claim 1 or 2, characterized in that, the viscosity of the solvent oil at 40 °C is 3 - 4 cSt.

4. The high-stability release agent for green sand according to claim 1, characterized in that, the solvent oil is petroleum ether and / or white oil.

5. The high-stability release agent for green sand according to claim 1, characterized in that, the viscosity of the methyl silicone oil at 40 °C is 2800 - 3200 cSt.

6. A preparation method of the high-stability release agent for green sand according to any one of claims 1 - 5, characterized in that, comprises the following steps: S1. Sequentially add water, emulsifier, ethylene base oil, solvent oil, and methyl silicone oil into a homogenizer and stir to obtain mixture A; S2. Add pigment into mixture A and stir for 2 - 20 min to obtain the high-stability release agent for green sand.

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