High-performance nodular cast iron release agent and preparation method thereof

Abstract

The invention belongs to the technical field of demolding materials, and discloses a nodular cast iron demolding agent and a preparation method thereof. The release agent comprises the following components in percentage by mass: 10-40% of base oil, 2-5% of an antirust agent, 0.5-2% of an antioxidant, 6-17% of an emulsifier, 0.8-2.8% of a film-forming agent, 0.01-0.1% of a surfactant, 0.1-0.5% of a defoaming agent and the balance of water, and the sum of the percentages of the components is 100%. The demolding material is suitable for spheroidal graphite cast iron molding demolding with high requirements on spheroidal graphite cast iron workpiece molding surface quality. The optimized additives are optimized and combined, so that the release agent is high in comprehensiveness, workpieces are high in aesthetic degree and easy to demould, and the production efficiency is improved; and the casting forming quality of the nodular cast iron is greatly improved due to excellent surface attractiveness, flatness and anti-rust performance.

Description

Technical Field

[0001] The invention belongs to the technical field of demoulding materials, and in particular relates to a high-performance ductile iron demoulding agent and a preparation method thereof. Background Art

[0002] With the continuous advancement of industrial and metal refining technologies, ductile iron products have become an indispensable part of production and daily life. Exploiting the full potential of ductile iron and creating a variety of workpieces through specific forming methods, such as forging and die-casting, can further enhance socioeconomic productivity. For manufacturers of ductile iron workpieces, achieving high-quality workpieces free of surface defects, such as smoothness and a lack of shrinkage cavities and porosity, ensuring easy separation between the mold and workpiece, and extending the life of the mold have become key production efficiency goals. Therefore, using a high-performance release agent that can achieve these requirements to assist in casting can significantly improve production efficiency and reduce labor costs. However, existing cast iron release agents on the market often suffer from issues such as friction marks on the workpiece surface due to insufficient lubrication, uneven surface finishes due to uneven application, and adhesion to the mold, making release difficult. Summary of the Invention

[0003] To overcome the shortcomings and deficiencies of the aforementioned prior art, the primary objective of the present invention is to provide a ductile iron release agent that achieves a smooth and aesthetically pleasing workpiece appearance, high finish, ease of demolding, and high lubricity. This release agent is particularly suitable for demolding ductile iron workpieces requiring high surface quality. It exhibits excellent film-forming properties, lubricity, demolding properties, and high-temperature resistance, significantly improving the surface finish of demolded workpieces. It also reduces the time and labor associated with manual mold tapping, improving production efficiency, and extending the life of the mold.

[0004] Another object of the present invention is to provide a method for preparing the ductile iron release agent.

[0005] The purpose of the present invention is achieved through the following solutions:

[0006] A ductile iron mold release agent comprises the following components in percentage by mass: 10-40% base oil, 2-5% rust inhibitor, 0.5-2% antioxidant, 6-17% emulsifier, 0.8-2.8% film-forming agent, 0.01-0.1% surfactant, 0.1-0.5% defoaming agent, and the remainder is water, wherein the sum of the percentages of the above components is 100%.

[0007] The base oil is synthetic ester, alkyl naphthalene, paraffin base oil, naphthenic base oil, PAO, and alkyl naphthalene.

[0008] Preferably, the base oil is isooctyl stearate 8103, paraffin base oil 150N, both of which have a kinematic viscosity of 15-25 mm 2 / s.

[0009] The rust inhibitor is at least one of dodecylene succinic acid, calcium / carboxylate alkyl naphthalene sulfonate, calcium / carboxylate dinonyl naphthalene sulfonate, barium petroleum sulfonate, barium dinonyl naphthalene sulfonate, lanolin sulfonate, lauric acid.

[0010] Preferably, the rust inhibitor is ash-free dodecylene succinic acid, lauric acid, both of which are in a ratio of 2:1.

[0011] The antioxidant is one or two of BHT, 2,4,6-tri-tert-butyl phenol, AO80 (3,9-bis[1,1-dimethyl-2-[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane), L135 liquid high molecular weight phenolic ester antioxidant, L57 octyl butyl diphenylamine.

[0012] Preferably, the antioxidant is AO80, L135, both of which are in a ratio of 4:3.

[0013] The emulsifier is a combination of two or more of sorbitan tristearate, polyoxyethylene sorbitol 4,5 oleate, triethanolamine oleate, polyoxyethylene monolaurate, polyoxyethylene monooleate.

[0014] Preferably, the emulsifier is a combination of sorbitan tristearate and polyoxyethylene monolaurate.

[0015] The film forming agent is one of water-based polyamide-imide modified bisphenol A type epoxy resin, water-based polyamide-imide o-cresol type epoxy resin, polyamide-imide modified methacrylate resin.

[0016] Preferably, the film forming agent is water-based polyamide-imide modified bisphenol A type epoxy resin.

[0017] The wetting agent is one of fluorine-containing fatty alcohol polyoxyethylene ether and fluorine-containing alkyl phenol polyoxyethylene ether.

[0018] Preferably, the wetting agent is fluorine-containing polyethylene glycol cetyl alcohol ether and fluorine-containing hexyl betaine.

[0019] The defoaming agent is polyether defoaming agent.

[0020] Preferably, the defoaming agent is glycerol polyoxypropylene ether.

[0021] The nodular cast iron release agent can be prepared by a conventional stirring and mixing method in the art: 1. The antioxidant and the rust inhibitor are added to a certain amount of base oil, heated to 60-70 DEG C, and stirred at constant temperature for 90 min, so that the antioxidant and the rust inhibitor are completely dissolved in the base oil; 2. The temperature of the base oil is controlled at 20-50 DEG C, the antioxidant and the rust inhibitor dissolved in the base oil are added, the film forming agent, the emulsifier, the surfactant and the deionized water are sequentially added to the reaction kettle under stirring, and stirring is performed until the mixture is uniformly mixed and transparent; 3. The defoaming agent is added to the transparent mixed oil sample, and finally the nodular cast iron release agent is obtained.

[0022] Compared with the prior art, the nodular cast iron release agent has the following advantages and beneficial effects:

[0023] The nodular cast iron release agent obtained by optimizing the combination of the preferred additives has excellent comprehensive performance, the formula system of the application has the advantages of rapid and uniform film forming and stability, the surface film layer of the mold has high compactness, the wear resistance after film forming is high, the workpiece has high smoothness, and the release is easy; by optimizing the surfactant, the film forming agent, the base oil and the rust inhibitor, the high qualified rate and high smoothness of the cast workpiece are achieved, the problem of manual knocking for release is solved, and the output efficiency of the workpiece of the production line is improved. DETAILED DESCRIPTION

[0024] The application will be further described in detail below in combination with examples, but the embodiments of the application are not limited thereto.

[0025] Example 1: Preparation of a nodular cast iron release agent

[0026] A nodular cast iron release agent comprises the following raw materials by weight percentage: isooctyl stearate 8103 25%, paraffin base oil 150N 12%, ashless dodecene succinic acid 3%, lauric acid 1.6%, AO80 0.4%, L135 0.3%, sorbitan tristearate 4%, polyoxyethylene monolaurate 7%, water-based polyamide imide o-cresol type epoxy resin 1%, fluorine-containing polyethylene glycol cetyl alcohol ether 0.01%, glycerol polyoxypropylene ether 0.1%, and the rest is water.

[0027] Preparation method:

[0028] 1. The AO80, the L135, the ashless dodecene succinic acid and the lauric acid are first added to a certain amount of isooctyl stearate 8103, heated to 60-70 DEG C, and stirred at constant temperature for 90 min, so that they are completely dissolved in the base oil;

[0029] 2, the remaining part of the temperature of the isooctyl stearate 8103 control at 20~50 ℃, the AO80, L135, ash-free dodecylene succinic acid, lauric acid dissolved in step 1 with isooctyl stearate 8103 is added to it, and the sorbitol tristearate, polyoxyethylene monolaurate, water-based polyamide imide o-cresol type epoxy resin, fluorine-containing polyethylene glycol cetostearyl ether, water are added to the reaction kettle under stirring, and the mixture is mixed uniformly and transparent, and finally the glycerol polyoxypropylene ether is obtained.

[0030] Performance test:

[0031] The nodular cast iron release agent prepared by the example is detected:

[0032]

[0033] Note: the test method is as follows:

[0034] Film thickness: a layer of release agent is brushed on the surface of the cleaned metal material sand mold, and after natural drying, a certain area of the layer film is scraped off, and the cross-sectional image of the material is observed by scanning electron microscope (SEM) and transmission electron microscope (TEM), and the actual thickness of the film is measured and calculated according to the scale beside the microscope image.

[0035] Shape appearance: visual evaluation criteria: the outline, round angle and other aspects of the castings are divided into 5 levels according to their correctness and beauty.

[0036] 1st: the appearance outline is clear, the round angle size is correct and the transition is smooth and beautiful;

[0037] 2nd: the appearance outline is less than 30% unclear, and the round angle transition is not smooth enough;

[0038] 3rd: the appearance outline is less than 50% unclear, and the round angle is less than 50% not made;

[0039] 4th: the appearance outline is less than 70% unclear, and the round angle is not made;

[0040] 5th: the appearance outline is not clear, the casting round angle is not made, and the bonding line (surface) is uneven;

[0041] Ejection force: the release agent is uniformly sprayed on the surface of the stainless steel mold, dried at room temperature (20~25) ℃ for 1-3 min, and a release agent coating is formed. Then the mixed uniform resin sand is filled into the stainless steel mold and compacted, and after complete curing, the stainless steel mold and the sand block are separated by using a hydraulic strength machine, and the data of the measuring instrument is recorded directly to obtain the force of the mold during the release process.

[0042] Single sheet rust prevention: using a dropper to take the test solution, according to the plum blossom format into five drops, on the test piece polished surface. Each drop diameter of about 4-5mm, then the test piece is placed on the drying rack, close the drying rack cover, placed in a constant temperature to 35℃±2℃ constant temperature oven, continuous test to the specified time to take out the test piece, observation.

[0043] Evaluation criteria: five drops of rust A level

[0044] Four drops of rust B level

[0045] Three drops of rust C level

[0046] Four to five drops of rust D level

[0047] A level is qualified

[0048] Laminated sheet rust prevention: the prepared test piece flat on the drying rack, the test piece polished surface upward, using a dropper to take the test solution, coated on the test piece, and then use another test piece of polished surface overlap. Close the drying rack cover, placed in a constant temperature to 35℃±2℃ constant temperature oven, continuous test to the specified time, open the test piece, using degreasing cotton dipped in anhydrous ethanol to wipe the test solution, immediately observe, within 1mm from the edge of the test piece two laminated surface, no rust or no obvious overlap for qualified.

[0049] Example 2: preparation of nodular cast iron release agent

[0050] A nodular cast iron release agent, comprising the following raw materials by weight percentage: isooctyl stearate 8103 is 38%, ashless dodecene succinic acid 2.8%, lauric acid 1.4%, AO80 is 0.6%, L135 is 0.4%, sorbitan tristearate 5.3%, polyoxyethylene monolaurate 8.2%, water-based polyamide imide o-cresol type epoxy resin 1.5%, fluorine-containing polyethylene glycol cetyl alcohol ether 0.02%, glycerol polyoxypropylene ether 0.1%, the rest is water.

[0051] Preparation method:

[0052] 1. First, add AO80, L135, ashless dodecene succinic acid, lauric acid to a certain amount of isooctyl stearate 8103, heated to 60-70℃, and stirred constant temperature 90min, so that they are completely dissolved in the base oil;

[0053] 2, the remaining part of the temperature control in the range of 20 ~ 50 ℃ stearic acid isooctyl ester 8103, the AO80, L135, ashless dodecene succinic acid, lauric acid in step 1 is dissolved in stearic acid isooctyl ester 8103 is added, under stirring, sorbitol tristearate, polyoxyethylene monolaurate, water-based polyamide imide o-cresol type epoxy resin, fluorine containing polyethylene glycol cetostearyl ether, water is added to the reaction kettle, stirring to mix evenly and clear transparent, finally add glycerol polyoxypropylene ether can get nodular cast iron release agent.

[0054] Performance test:

[0055] The nodular cast iron release agent prepared in the example is detected:

[0056]

[0057] Example 3: preparation of nodular cast iron release agent

[0058] A nodular cast iron release agent, comprising the following raw materials by weight percentage: stearic acid isooctyl ester 8103 is 17%, paraffin base oil 150N is 22%, ashless dodecene succinic acid 2.6%, lauric acid 1.2%, AO80 is 0.7%, L1350 is 0.46%, sorbitol tristearate 6.9%, polyoxyethylene monolaurate 9.0%, water-based polyamide imide o-cresol type epoxy resin 1.2%, fluorine containing polyethylene glycol cetostearyl ether 0.01%, glycerol polyoxypropylene ether 0.2%, the rest is water.

[0059] Preparation method:

[0060] 1, first add AO80, L135, ashless dodecene succinic acid, lauric acid to a certain amount of stearic acid isooctyl ester 8103, heated to 60 ~ 70 ℃, and stirring constant temperature 90 min, so that they are completely dissolved in the base oil;

[0061] 2, the remaining part of the temperature control in the range of 20 ~ 50 ℃ stearic acid isooctyl ester 8103, the AO80, L135, ashless dodecene succinic acid, lauric acid in step 1 is dissolved in stearic acid isooctyl ester 8103 is added, under stirring, sorbitol tristearate, polyoxyethylene monolaurate, water-based polyamide imide o-cresol type epoxy resin, fluorine containing polyethylene glycol cetostearyl ether, water is added to the reaction kettle, stirring to mix evenly and clear transparent, finally add glycerol polyoxypropylene ether can get nodular cast iron release agent.

[0062] Performance test:

[0063] The nodular cast iron release agent prepared in the example is detected:

[0064]

[0065] Example 4: Performance test of nodular cast iron release agent products on the market at present:

[0066]

[0067] From the performance tests of Examples 1-4 above, it can be seen that the nodular cast iron release agent of the present application is superior to the comparative examples in film thickness, shape appearance, drawing force and rust resistance. It is shown that the nodular cast iron release agent of the present application has good film forming performance and excellent release performance, not only can meet the molding requirements of nodular cast iron, but also is easy to be released from the mold after molding, improves the appearance of nodular cast iron workpieces, reduces the subsequent manual knock-out release times, and improves the production efficiency and yield.

[0068] The above examples are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application should be equivalent replacement methods, and are all included in the protection scope of the present application.

Claims

1. A ductile iron release agent, characterized in that The invention comprises the following components in percentage by mass: 10-40% base oil, 2-5% rust inhibitor, 0.5-2% antioxidant, 6-17% emulsifier, 0.8-2.8% film-forming agent, 0.01-0.1% surfactant, 0.1-0.5% defoaming agent, and the rest is water, and the sum of the percentages of the above components is 100%.

2. The ductile iron release agent according to claim 1, wherein: The base oil is synthetic ester, alkyl naphthalene, paraffin base oil, naphthenic base oil, PAO, alkyl naphthalene, and its kinematic viscosity at 40°C is 15-25 mm 2 / s.

3. The ductile iron release agent according to claim 1, wherein: The rust preventive agent is at least one of dodecene succinic acid, alkyl naphthalene sulfonate calcium / carboxylate, dinonyl naphthalene sulfonate calcium / carboxylate, petroleum barium sulfonate, dinonyl naphthalene sulfonate barium, lanolin sulfonate, and lauric acid.

4. The ductile iron release agent according to claim 1, wherein: The antioxidant is one or two of BHT, 2,4,6-tri-tert-butylphenol, AO80 (3,9-bis[1,1-dimethyl-2-[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane), L135 liquid high molecular weight phenol ester antioxidant, and L57 octylbutyldiphenylamine.

5. The ductile iron release agent according to claim 1, wherein: The emulsifier is a combination of two or more of sorbitan tristearate, polyoxyethylene sorbitol 4,5 oleate, triethanolamine oleate, polyoxyethylene monolaurate and polyoxyethylene monooleate.

6. The ductile iron release agent according to claim 1, characterized in that: The film-forming agent is one of water-based polyamide-imide epoxy resin and water-based polyamide-imide acrylic resin.

7. The ductile iron release agent according to claim 1, characterized in that: The surfactant is one of fluorinated fatty alcohol polyoxyethylene ether and fluorinated alkylphenol polyoxyethylene ether.

8. The ductile iron release agent according to claim 1, characterized in that: The defoamer is a polyether defoamer.

9. A method for preparing a ductile iron release agent according to any one of claims 1 to 8, characterized in that The method comprises the following specific steps: (1) adding an antioxidant and a rust preventive to a certain amount of base oil, heating the mixture to 60° C. to 70° C., and stirring the mixture at a constant temperature for 90 minutes, so that the antioxidant and the rust preventive are completely dissolved in the base oil; (2) controlling the temperature of the base oil at 20° C. to 50° C., adding the antioxidant and the rust preventive dissolved in the base oil, and sequentially adding a film-forming agent, an emulsifier, a surfactant, and deionized water into a reactor under stirring, stirring the mixture until the mixture is uniform and clear, and finally adding a defoaming agent to obtain a ductile iron release agent.

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