CN112059103B - Preparation method and application of acid-process cold core box resin for casting - Google Patents
Preparation method and application of acid-process cold core box resin for casting Download PDFInfo
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- CN112059103B CN112059103B CN202010896384.5A CN202010896384A CN112059103B CN 112059103 B CN112059103 B CN 112059103B CN 202010896384 A CN202010896384 A CN 202010896384A CN 112059103 B CN112059103 B CN 112059103B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2206—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2226—Polymers containing halogens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2266—Polyesters; Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F259/00—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00
- C08F259/02—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00 on to polymers containing chlorine
- C08F259/04—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00 on to polymers containing chlorine on to polymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
- C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
- C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
- C08G14/12—Chemically modified polycondensates
Abstract
The invention discloses a preparation method and application of acid-process cold core box resin for casting, which belongs to the technical field of casting materials.
Description
Technical Field
The invention relates to the technical field of casting materials, in particular to a preparation method and application of acid-process cold core box resin for casting.
Background
The cold-box resin sand is different from the hot-box resin sand, and the cold-box resin sand is used for hardening the core sand in the core box by blowing gas or an aerosol hardening agent at normal temperature. The triethylamine cold box method, the adhesive is composed of thermoplastic liquid phenolic resin, toluene di-isocyanate and amine catalyst. In general, the ratio of liquid phenolic resin to toluene diisocyanate is l: 1, the total amount of the two adhesives is 1.5-2.0% of the mass of the sand, and triethylamine aerosol is blown in after core shooting to harden the sand core. The triethylamine cold-box method has good core sand fluidity and smooth casting surface, but the triethylamine is toxic, and the precautionary measures should be strengthened. The "cold box method" is a core making method which can completely harden resin in a short time at normal temperature, and can produce sand core and sand mold in parallel on an automatic assembly line, which is favorable for improving productivity. The core box can be made of no metal, and heating equipment is saved, so that the cost is reduced. In addition, the sand core has high sand discharging performance, high surface smoothness and high size precision. The diffusion gas cold-box resin sand is referred to as gas hard cold-box resin sand. The method is characterized in that after resin sand is injected into a core box at room temperature, a gas catalyst is blown into the core box immediately, so that a chemical reaction is generated in a sand core and the sand core is rapidly hardened. The triethylamine method is the earliest process applied to a modern air-blowing cold core box, is successfully developed by American Saybolt grease chemical company, and is popularized and applied to a foundry in 1968. The core making method is characterized in that a component I is liquid phenolic resin, a component II is a bi-component binder of polyisocyanate, the bi-component binder is added into raw sand and uniformly mixed, the mixture is injected into a core box, and triethylamine taking carbon dioxide, air or nitrogen as a carrier is introduced to harden a sand core within seconds. The method has the advantages of short curing time, high sand core strength, long sand core storage period, good shakeout performance, high production efficiency, energy conservation and smooth casting surface, and can be used for manufacturing sand cores with different complexity and sizes. Therefore, the triethylamine method is widely applied to the production of iron castings in the industries of automobiles, tractors, diesel engines, internal combustion engines and the like. At present, a large number of cold box sand cores come from the process of making cores by a triethylamine method, and the technology of making cores by the triethylamine method plays an important role in the production of engine cylinder bodies. After core blowing, triethylamine catalyst is introduced immediately to make it absorbed by resin to produce chemical reaction to produce carbamate resin, so that the sand core has good technological properties. But is harmful to human body due to the resin and catalyst used; the cast parts often produce burrs and have poor surface quality. Thus, this core-making process is relatively slow to develop. The technical personnel in the field need to develop a preparation method and application of acid-method cold box resin for casting to meet the existing use requirement.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing an acid-process cold box resin for casting, and the curing gas source of the acid-process cold box resin is acidic substances such as oxalic acid, acetic acid or carbon dioxide gas.
A preparation method of acid-process cold box resin for casting comprises the following steps:
(1) weighing the following raw materials in parts by weight: 39-42 parts of modified benzoxazine resin, 31-33 parts of epichlorohydrin resin, 13-15 parts of diisocyanate, 19-22 parts of maleic anhydride, 9-11 parts of polyester resin softener, 1-3 parts of catalyst and 0.5-1 part of sand surface modifier;
(2) resin sizing agent: adding epichlorohydrin resin and maleic anhydride into a grinder, grinding for 20-30 min, pouring the mixture into a high-speed mixer, adding diisocyanate, a catalyst and a polyester resin softener into the high-speed mixer according to a formula, and fully stirring for 10-20 min to obtain resin slurry;
(3) and fully mixing and stirring the resin slurry and the modified benzoxazine resin uniformly to obtain the benzoxazine resin.
Further, the diisocyanate is one or more of toluene diisocyanate, L-lysine diisocyanate and 1, 6-hexamethylene diisocyanate.
Further, the preparation method of the modified benzoxazine comprises the steps of putting 11.5-12.8 parts of phenol, 7-8 parts of paraformaldehyde, 17-18 parts of 4-propargyl ether phenylamine and 0.6-1.1 parts of triphenylboron into a reaction kettle with a condensing tube and a thermometer, electromagnetically stirring for 25-35 min at 25-30 ℃ to fully mix the materials, then performing microwave irradiation reaction at 2450kHz under electromagnetic stirring for 5-10 min, dispersing the product into tetrahydrofuran, washing with 0.5-1 mol/L NaOH solution, washing with water to be neutral, adding anhydrous calcium sulfate to remove water, filtering, performing rotary evaporation on the tetrahydrofuran to remove the water, and drying at 65-70 ℃ for 2-3 h to obtain the modified benzoxazine.
Further, the chlorinated polyether resin is a copolymer of vinyl chloride and isobutyl vinyl ether, wherein the content of isobutyl vinyl ether is 25%.
Further, the catalyst is one of dibenzoyl peroxide and azobisisobutyronitrile.
Further, the sand surface modifier is one of 2-chromium chloride methacrylate, tetra-n-propyl zirconate and vinyl benzyl amino ethyl trimethoxy silane hydrochloride.
In the application method of the acid-process cold box resin for casting as the acid-process cold box resin for casting, the solidified gas source of the acid-process cold box resin for casting is an acidic substance, and the acidic substance is one of oxalic acid, acetic acid and carbon dioxide gas.
The invention has the beneficial effects that:
the invention relates to an acid-method cold-box resin for casting, which is a cold-box resin adopting a curing gas source with acid property, a catalyst adopted by the resin slurry can be decomposed to form free radicals, and the epichlorohydrin resin slurry is initiated to form macromolecular free radicals, the macromolecular free radicals and maleic anhydride containing double bonds in a system are subjected to a grafting reaction to form a grafted maleic anhydride polymer, so that the heat resistance of the cold-box resin is improved, hydrogen chloride is released in the process, the defect that the benzoxazine and the epichlorohydrin resin are crosslinked in the prior art is overcome, the crosslinking density is rapidly improved in the acid-blowing curing process of the benzoxazine, the benzoxazine absorbs the hydrogen chloride, and the benzoxazine has a high-reaction-activity cation structure, so that the curing temperature is reduced, a uniform crosslinked network structure is formed in a blend, and the cold-box resin has high bonding strength, excellent heat resistance, flame retardance and the like, the strength of the cold core box resin is further improved, the polyester resin softener and the chlorinated polyether resin can form resin slurry with good rheological property due to the internal plasticization effect of isobutyl vinyl ether, and the resin slurry is mixed with benzoxazine to improve the toughness of the benzoxazine resin to prepare the acid-property-cured cold core box resin, and the cold core box resin has high dimensional precision and small shrinkage rate, does not use gas curing agents such as triethylamine and other toxic odors, can be directly discharged into the atmosphere, does not need a tail gas treatment device, is not sensitive to environmental humidity, has little influence on strength after moisture absorption, and aims at the environmental pollution problem of the curing agents, so that the curing agent treatment equipment is greatly simplified, harmful components in the resin and the curing agents are reduced, the environment-friendly core making period is basically short, and the production efficiency is high; the sand core is hardened at normal temperature, so that energy sources can be saved, labor conditions can be improved, cheap wood and plastic core boxes can be used, and the manufacturing cost of the core box is reduced; the core box is free from the problem of thermal deformation, the manufactured sand core is high in dimensional accuracy, good in surface quality and free from the problem of over hardening, the size and the change of the section size of the sand core are not limited, and acid media such as oxalic acid, acetic acid and carbon dioxide can be used for blowing and curing.
Compared with the prior art, the invention has the following advantages:
the acid-method cold core box for casting disclosed by the invention has the advantages that the resin core making period is short, the production efficiency is high, the sand core is hardened at normal temperature, the energy can be saved, the labor condition can be improved, the cheap wood and plastic core box can be used, and the core box manufacturing cost is reduced; the core box is not deformed by heating, and the manufactured sand core has high dimensional precision and good surface quality; the method has no over hardening problem and has no limit on the size and change of the section size of the sand core. The defects of the method are as follows: the resin and the curing agent are inflammable and need to be stored at the temperature of below 30 ℃; the strength of the sand core is slightly lower than that of the shell core and the hot core box; the method does not use gas curing agents such as triethylamine, sulfur dioxide and the like, has toxic and odorous substances, cannot be directly discharged into the atmosphere, needs a tail gas treatment device, and needs to seal a core box during core making; the sand core is not sensitive to the environmental humidity, and the strength is not greatly influenced after moisture absorption. Aiming at the problem of environmental pollution of the curing agent, the curing agent treatment equipment is greatly simplified, harmful ingredients in the resin and the curing agent are reduced, the environment is not polluted basically, the core making period is short, and the production efficiency is high; the sand core is hardened at normal temperature, so that energy sources can be saved, labor conditions can be improved, cheap wood and plastic core boxes can be used, and the manufacturing cost of the core box is reduced; the core box is not deformed by heating, and the manufactured sand core has high dimensional precision and good surface quality; the method has no over hardening problem and has no limit on the size and change of the section size of the sand core. The defects of the method are as follows: the resin and the curing agent are inflammable and need to be stored at the temperature of below 30 ℃; the strength of the sand core is slightly lower than that of the shell core and the hot core box; the method does not use toxic and odorous gas curing agents such as triethylamine and the like, can be directly discharged into the atmosphere, and a core box is sealed when a tail gas treatment device is required; the sand core is not sensitive to the environmental humidity, and the strength is not greatly influenced after moisture absorption. Aiming at the problem of environmental pollution of the curing agent, the curing agent treatment equipment is greatly simplified, harmful components in the resin and the curing agent are reduced, and the environment is basically not polluted.
Detailed Description
Example 1
Firstly, weighing the following raw materials in parts by weight: 42 parts of modified benzoxazine resin, 33 parts of chlorinated polyether resin, 15 parts of L-lysine diisocyanate, 22 parts of maleic anhydride, 11 parts of polyester resin softener, 3 parts of catalyst dibenzoyl peroxide and 1 part of sand surface modifier 2-chromium methacrylate chloride; step two, resin sizing agent: adding epichlorohydrin resin and maleic anhydride into a grinder, grinding for 30min, pouring the mixture into a high-speed mixer, adding diisocyanate, a catalyst and a polyester resin softener into the high-speed mixer according to a formula, and fully stirring for 10min to obtain resin slurry; and thirdly, fully mixing and uniformly stirring the resin slurry and modified benzoxazine resin, wherein the modified benzoxazine is obtained by putting 12.8 parts of phenol, 8 parts of paraformaldehyde, 18 parts of 4-propargyl ether aniline and 01.1 parts of triphenylboron into a reaction kettle with a condenser tube and a thermometer, electromagnetically stirring for 35min at 30 ℃ to fully mix the mixture, then carrying out microwave irradiation reaction at 2450kHz under electromagnetic stirring for 10min, dispersing the product in tetrahydrofuran, washing with a 01mol/L NaOH solution, washing with water to neutrality, adding anhydrous calcium sulfate to remove water, filtering, carrying out rotary evaporation on the tetrahydrofuran by using a rotary evaporator, and drying for 3h at 70 ℃ to obtain the modified benzoxazine, wherein the chloroether resin is a copolymer of vinyl chloride and isobutyl vinyl ether, and the content of the isobutyl vinyl ether is 25%.
In the application method of the acid-process cold box resin for casting as the acid-process cold box resin for casting, the curing gas source of the acid-process cold box resin for casting is an acidic substance, and the acidic substance is an acetic acid solution with the mass fraction of 1.5%.
Chloroether resin was purchased from MP25, Texin science and technology, Xinxin, Xinjiang, and polyester resin softener was purchased from DIC polyester plasticizer W-2050.
Example 2
Firstly, weighing the following raw materials in parts by weight: 39 parts of modified benzoxazine resin, 31 parts of chlorinated polyether resin, 13 parts of toluene diisocyanate, 19 parts of maleic anhydride, 9 parts of polyester resin softener, 1 part of azodiisobutyronitrile serving as a catalyst and 0.5 part of vinylbenzylaminoethyl trimethoxysilane hydrochloride serving as a sand surface modifier; step two, resin sizing agent: adding epichlorohydrin resin and maleic anhydride into a grinder, grinding for 20min, pouring the mixture into a high-speed mixer, adding diisocyanate, a catalyst and a polyester resin softener into the high-speed mixer according to a formula, and fully stirring for 10min to obtain resin slurry; and thirdly, fully mixing and uniformly stirring the resin slurry and modified benzoxazine resin, wherein the modified benzoxazine is obtained by putting 11.5 parts of phenol, 7 parts of paraformaldehyde, 17 parts of 4-propargyl ether aniline and 0.6 part of triphenylboron into a reaction kettle with a condenser tube and a thermometer, electromagnetically stirring for 25min at 25 ℃ to fully mix the phenol, the paraformaldehyde, the 4-propargyl ether aniline and the triphenylboron, performing microwave irradiation reaction for 5min at 2450kHz under electromagnetic stirring, dispersing a product in tetrahydrofuran, washing with 0.5mol/L NaOH solution, washing with water to neutrality, adding anhydrous calcium sulfate to remove water, filtering, performing rotary evaporation on the tetrahydrofuran by using a rotary evaporator, and drying for 2h at 65 ℃ to obtain the modified benzoxazine, wherein the chloroether resin is a copolymer of vinyl chloride and isobutyl vinyl ether, and the content of the isobutyl vinyl ether is 25%.
In the application method of the acid-process cold core box resin for casting as the acid-process cold core box resin for casting, the curing gas source of the acid-process cold core box resin for casting is an acidic substance, and the acidic substance is an oxalic acid solution, specifically an oxalic acid solution with the mass fraction of 2.5%, and is purchased from the chemical industry of Jiaxing city Chang Li.
The epichlorohydrin resin was obtained from MP25 from Xinxin science and technology, Xinjiang, and the polyester resin softener was obtained from DIC polyester plasticizer W-8000.
Comparative example 1
In comparison with example 2, in the raw material weighing step, the polyester resin softener component was omitted, except that the other method steps were the same.
Comparative example 2
In this comparative example, compared to example 2, the maleic anhydride component was omitted in the first step, except that the process steps were otherwise identical.
Comparative example 3
In this comparative example, compared to example 2, in the first step, the sand surface modifier component was omitted, except that the process steps were the same.
The cold box resins of examples 1-2 and comparative examples 1-3 were subjected to performance tests, and the test results are shown in Table 1
TABLE 1 Performance test results for Cold-Box resins of examples 1-2 and comparative examples 1-3
Note: hot box resins for JB/T3828-1999 foundry; the density measurement is carried out according to the regulation of GB/T4472; the measurement of the viscosity was carried out according to the regulations of GB/T2794; heating a recording gas evolution tester to 850 ℃, keeping constant temperature, weighing 1g of sand ground from a fracture of a molding sand sample, uniformly putting the sand into a porcelain boat (the porcelain boat needs to be burnt at 1000 ℃ for 30min before use and then placed in a dryer to be cooled to room temperature), sending the porcelain boat containing the sample into a red heat part of a quartz tube of the gas evolution tester, rapidly sealing the fracture with a plug, simultaneously starting working of a recording part of the gas evolution tester, recording the gas evolution of the tested sample, and reading the gas evolution of the sample after 1 min; testing SWY hydraulic strength testing machine for testing normal temperature tensile strength; an SHY resin sand mixer; the 8-shaped standard test block model is executed according to the specification of GB/T2684; standard sand for Tongliaodalin: the regulation of GB/T25138 is met; injecting oxalic acid and acetic acid, wherein the acetic acid in the embodiment 1, the oxalic acid in the embodiment 2 and the oxalic acid in the comparative examples 1-3, the amount of the injected acid is 70% of the volume of the storage tank, opening a core shooter switch, pressing a 'SPECISUNG' key, and opening an air instrument switch, wherein the parameters are set as follows: air pressure 0.45Mpa, core shooting time 3 s; blowing acid for 2s, and blowing amine under the pressure of 0.2 Mpa; the purification time is 10s, and the purification pressure is 0.2 MPa. Loading an empty charging barrel, empty core shooting for three times, removing residual sand in a core box, preparing a mixture, weighing 2000g of standard sand on a tray, reserving two resin positions on the sand, respectively weighing 20g of cold core box resin, putting the cold core box resin into an SHY resin sand mixer, stirring for 1 minute, kneading the resin which is not dispersed, discharging after continuously stirring for 1 minute, preparing a sample, pouring the mixture into a COLDBOX charging barrel, uniformly shaking, loading into a core shooting machine, pressing a Start key, starting core shooting, wherein the core shooting time is 3s, and the acid blowing is 10s for curing. After solidification is finished, taking down the 8-shaped sand core and placing the sand core on a platform to be measured; measuring tensile strength, placing 8 characters to be measured according to specified items and specified time in groups, wherein each group comprises 5 characters, and measuring instant, 1h, 24h and 24h moisturizing, normal-temperature and normal-humidity samples: is placed on the table top to be measured. Saturated humidity sample: is placed on a disc filled with water at the lower part of the dryer. The method comprises the steps of measuring a sample on an SWY hydraulic strength tester of Jinan spring instrument equipment Limited according to specified time and project, placing the sample in a clamp of the strength tester, enabling planes of four rollers in the clamp to be attached to the waist of the sample, gradually loading by rotating a hand wheel at a constant speed until the sample is broken, recording the reading of a pressure gauge as a tensile strength value, calculating and measuring 5 sample strength values according to the result, then removing the maximum value and the minimum value, and taking the average value of other three values to obtain the strength value of the sample.
Claims (8)
1. The preparation method of the acid-process cold box resin for casting is characterized by comprising the following steps of:
(1) weighing the following raw materials in parts by weight: 39-42 parts of modified benzoxazine resin, 31-33 parts of chlorinated polyether resin, 13-15 parts of diisocyanate, 19-22 parts of maleic anhydride, 9-11 parts of polyester resin softener, 1-3 parts of catalyst and 0.5-1 part of sand surface modifier, wherein the modified benzoxazine is prepared by placing 11.5-12.8 parts of phenol, 7-8 parts of paraformaldehyde, 17-18 parts of 4-propargyl ether aniline and 0.6-1.1 part of triphenylboron into a reaction kettle with a condenser tube and a thermometer, electromagnetically stirring for 25-35 min at 25-30 ℃ to fully mix, then performing microwave irradiation reaction at 2450kHz under electromagnetic stirring for 5-10 min, dispersing the product into tetrahydrofuran, washing with 0.5-1 mol/L NaOH solution, washing with water to neutrality, adding anhydrous calcium sulfate to remove water, filtering, removing tetrahydrofuran by rotary evaporation with a rotary evaporator, drying at 65-70 ℃ for 2-3 h, obtaining modified benzoxazine;
(2) resin sizing agent: adding epichlorohydrin resin and maleic anhydride into a grinder, grinding for 20-30 min, pouring the mixture into a high-speed mixer, adding diisocyanate, a catalyst and a polyester resin softener into the high-speed mixer according to a formula, and fully stirring for 10-20 min to obtain resin slurry;
(3) and fully mixing and stirring the resin slurry and the modified benzoxazine resin uniformly to obtain the benzoxazine resin.
2. The method for preparing the acid-method cold box resin for foundry according to claim 1, wherein the diisocyanate is one or more of toluene diisocyanate, L-lysine diisocyanate and 1, 6-hexamethylene diisocyanate.
3. The method for preparing acid-method cold-box resin for foundry according to claim 1, wherein the chlorinated polyether resin of step (1) is a copolymer of vinyl chloride and isobutyl vinyl ether, wherein the content of isobutyl vinyl ether is 25%.
4. The method for preparing acid-method cold-box resin for foundry according to claim 1, wherein the catalyst of step (1) is one of dibenzoyl peroxide and azobisisobutyronitrile.
5. The method for preparing acid-process cold-box resin for foundry according to claim 1, wherein the sand surface modifier of step (1) is one of 2-chromium (meth) acrylate chloride, tetra-n-propyl zirconate, vinylbenzylaminoethyltrimethoxysilane hydrochloride.
6. The acid-process cold-box resin for foundry prepared by the method for preparing the acid-process cold-box resin for foundry of any one of claims 1 to 5.
7. Use of the acid-method cold-box resin for foundry as defined in claim 6 as an acid-method cold-box resin for foundry.
8. The use of the acid-process cold-box resin for casting as a casting acid-process cold-box resin for casting according to claim 7, wherein the curing gas source of the acid-process cold-box resin for casting is an acidic substance, and the acidic substance is one of oxalic acid, acetic acid and carbon dioxide gas.
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| US3549584A (en) * | 1967-12-26 | 1970-12-22 | Cpc International Inc | No-bake resin binders |
| CN1065029A (en) * | 1992-02-15 | 1992-10-07 | 刘孝慈 | Chilled resin for casting |
| CN1871080A (en) * | 2003-07-25 | 2006-11-29 | 亚什兰许可和知识产权有限公司 | Cold-box binders containing an epoxy resin, acrylate, and certain akyl esters |
| CN101314175A (en) * | 2007-05-28 | 2008-12-03 | 洛阳双瑞特钢科技有限公司 | Alkalescent phenol resin sand carbonic anhydride induration cold box core-manufacturing method and application thereof |
| CN103113526A (en) * | 2013-02-01 | 2013-05-22 | 海宁永大电气新材料有限公司 | Solvent-less impregnating resin for high-voltage motor and curing method |
| CN103554832A (en) * | 2013-11-04 | 2014-02-05 | 宁夏共享集团有限责任公司 | Preparation method of resin for casting |
| CN106188538A (en) * | 2015-04-10 | 2016-12-07 | 台光电子材料股份有限公司 | modified benzoxazine resin, composition and application thereof |
| CN106040966A (en) * | 2015-06-18 | 2016-10-26 | 济南圣泉集团股份有限公司 | Cold core box binder and casting molding body |
| CN109954837A (en) * | 2017-12-22 | 2019-07-02 | 沈阳汇亚通铸造材料有限责任公司 | A kind of carbonic anhydride induration cold box core-manufacturing composition and core-making method |
| CN108907068A (en) * | 2018-06-29 | 2018-11-30 | 宁夏共享化工有限公司 | It is a kind of for casting the phenolic resin high-temperature curing agent in 3D inkjet printing field |
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