CN112079977A - Modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand and preparation method thereof - Google Patents
Modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand and preparation method thereof Download PDFInfo
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- CN112079977A CN112079977A CN202011013996.1A CN202011013996A CN112079977A CN 112079977 A CN112079977 A CN 112079977A CN 202011013996 A CN202011013996 A CN 202011013996A CN 112079977 A CN112079977 A CN 112079977A
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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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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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
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
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Abstract
The invention relates to a modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand and a preparation method thereof, wherein the binder comprises the following components in parts by weight: 100 parts of phenol, 56-65 parts of formaldehyde solution, 0.8-1 part of oxalic acid, 0.5-0.8 part of polyaluminum chloride, 1-1.5 parts of aluminum hydroxide, 3.0-3.5 parts of polysulfone resin, 0.8-1.2 parts of silicon resin and 1.8-2.2 parts of EBS. The method comprises the following steps: adding phenol, a catalyst, a modifier A and a modifier C into a reaction kettle according to the proportion, then dropwise adding a formaldehyde solution into the mixed solution, heating and carrying out vacuum dehydration after the medium-temperature measurement is qualified, and blowing phenol; and adding the modifier B, stirring, adding the silicon resin and the EBS, and performing granulation operation to obtain a finished product. According to the invention, the mixture of polyaluminium chloride, aluminium hydroxide and polysulfone resin is used as the composite modifier, so that the prepared phenolic resin binder for precoated sand has excellent performances of high temperature resistance, high strength, low expansion, low gas evolution, slow gas evolution and the like.
Description
Technical Field
The invention relates to the technical field of production of phenol formaldehyde resin, in particular to a modified high-temperature-resistant and high-strength phenol formaldehyde resin binder for precoated sand and a preparation method thereof.
Background
The precoated sand is the best molding material of a casting mold, is particularly suitable for producing thin-wall precise iron castings and high-requirement steel castings, but has defects in use, such as low melting point, slow curing speed, low thermal strength and the like of the precoated sand, the defects can cause fire running and unshelling, and the key for solving the problems is to improve the high temperature resistance and the strength of the precoated sand. The phenolic resin is used as a binder in the precoated sand, and if the gas evolution is large, the gas exhaust of the casting pore core is not smooth, and the low strength of the phenolic resin causes deformation, breakage and the like of the molding (core). Therefore, the development of a high-temperature-resistant and high-strength phenolic resin is the key for producing the novel precoated sand with excellent high-temperature performance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a modified high-temperature-resistant and high-strength phenolic resin bonding agent for precoated sand and a preparation method thereof.
The technical scheme adopted by the invention is as follows: a modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components: phenol, formaldehyde solution, catalyst, composite modifier, silicone resin and EBS.
Preferably, the composite modifier comprises a modifier A, a modifier B and a modifier C, wherein the modifier A is polyaluminium chloride, the modifier B is aluminium hydroxide, the modifier C is polysulfone resin, and the catalyst is oxalic acid.
Preferably, the binding agent comprises the following components in parts by weight: 100 parts of phenol, 56-65 parts of formaldehyde solution, 0.8-1 part of oxalic acid, 0.5-0.8 part of polyaluminum chloride, 1-1.5 parts of aluminum hydroxide, 3.0-3.5 parts of polysulfone resin, 0.8-1.2 parts of silicon resin and 1.8-2.2 parts of EBS.
Preferably, the mass concentration of the phenol is more than or equal to 99 percent, and the weight content of the formaldehyde in the formaldehyde solution is 36.5-37.8 percent.
A preparation method of the modified high-temperature-resistant and high-strength phenolic resin bonding agent for the precoated sand comprises the following steps:
s1: adding phenol, a catalyst, a modifier A and a modifier C into the reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution;
s2: heating the mixed solution to 85-90 ℃, then dropwise adding a formaldehyde solution into the mixed solution, simultaneously cooling the reaction kettle to maintain the liquid in the reaction kettle in a certain temperature range, keeping the temperature for a certain time after the dropwise adding of the formaldehyde solution is finished to obtain a reaction solution, and taking a reaction solution sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃;
s4: and adding the modifier B into the reaction kettle after phenol blowing is finished, stirring for 20-40min, adding the silicon resin and the EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Preferably, in step S2, the temperature of the reaction kettle is reduced to maintain the temperature of the liquid in the reaction kettle at 90-100 ℃.
Preferably, the formaldehyde solution is added dropwise in step S2 within 150-120 min, and the reaction is carried out for 30-45min after the addition is completed.
Preferably, the time for blowing phenol in step S3 is 150-200 min.
Compared with the prior art, the invention has the following advantages: according to the invention, the mixture of polyaluminium chloride, aluminium hydroxide and polysulfone resin is used as the composite modifier, so that the prepared phenolic resin binder for precoated sand has excellent performances of high temperature resistance, high strength, low expansion, low gas evolution, slow gas evolution and the like; therefore, the precoated sand prepared by the phenolic resin bonding agent has the advantages of high heat strength, long heat-resisting time, small high-temperature deformation, excellent high-temperature performance and comprehensive casting performance, and is particularly suitable for the production of complex thin-wall precise iron castings and steel castings with higher requirements; the steel casting produced by the precoated sand has smooth surface and accurate size, effectively eliminates the casting defects of sand sticking, deformation, heat cracking, air holes and the like, improves the quality of the product and reduces the production cost.
Detailed Description
For a better illustration of the invention, it will now be further illustrated with reference to examples. The following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. The skilled person is well within the scope of the prior art, and substitutions by conventional means and simple combinations with the prior art are possible without departing from the scope of the invention.
The invention provides a modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand, which comprises the following components: phenol, formaldehyde solution, catalyst, composite modifier, silicone resin and EBS; the composite modifier comprises a modifier A, a modifier B and a modifier C, wherein the modifier A is polyaluminium chloride, the modifier B is aluminum hydroxide, the modifier C is polysulfone resin, and the catalyst is oxalic acid. The bonding agent comprises the following components in parts by weight: 100 parts of phenol, 56-65 parts of formaldehyde solution, 0.8-1 part of catalyst, 0.5-0.8 part of modifier A, 1-1.5 parts of modifier B, 3.0-3.5 parts of modifier C, 0.8-1.2 parts of silicon resin and 1.8-2.2 parts of EBS. Wherein the mass concentration of the phenol is more than or equal to 99 percent, and the weight content of the formaldehyde in the formaldehyde solution is 36.5-37.8 percent.
The second aspect of the invention provides a preparation method of a modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand, which comprises the following steps:
s1: adding phenol, a catalyst, a modifier A and a modifier C into the reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 85-90 ℃, then opening a valve of a reaction kettle dripping tank to drip the formaldehyde solution in the reaction kettle dripping tank into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 90-100 ℃, finishing dripping the formaldehyde solution in 120 plus 150min, then carrying out heat preservation reaction for 30-45min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: after the medium temperature is qualified, heating the reaction liquid and performing vacuum dehydration, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 150-;
s4: and adding the modifier B into the reaction kettle after phenol blowing is finished, stirring for 20-40min, adding the silicon resin and the EBS (ethylene bis stearamide) into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Wherein, the modifier A is polyaluminium chloride, the modifier B is aluminium hydroxide, the modifier C is polysulfone resin, and the catalyst is oxalic acid.
The present invention will be specifically described below by way of examples. It is to be noted that the following examples are only for further illustration of the present invention and should not be construed as limiting the scope of the present invention. Many non-essential modifications and adaptations of the present invention will occur to those skilled in the art in view of the foregoing description, and are intended to be within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
56 parts of formaldehyde solution;
0.9 part of oxalic acid;
0.6 part of polyaluminium chloride;
1.2 parts of aluminum hydroxide;
3.0 parts of polysulfone resin;
1.2 parts of silicone resin;
EBS 2.0 parts.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 85 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 90 ℃, finishing dripping the formaldehyde solution within 150min, then preserving heat and reacting for 40min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 170 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 30min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Example 2
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
60 parts of formaldehyde solution;
0.8 part of oxalic acid;
0.8 part of polyaluminium chloride;
1 part of aluminum hydroxide;
3.5 parts of polysulfone resin;
0.8 part of silicone resin;
and 1.8 parts of EBS.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 90 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 100 ℃, finishing dripping the formaldehyde solution within 120min, then carrying out heat preservation reaction for 30min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 150 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 20min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Example 3
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
65 parts of formaldehyde solution;
1.0 part of oxalic acid;
0.5 part of polyaluminium chloride;
1.5 parts of aluminum hydroxide;
3.2 parts of polysulfone resin;
1.0 part of silicone resin;
and 2.2 parts of EBS.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 88 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 95 ℃, finishing dripping the formaldehyde solution within 130min, then keeping the temperature for reacting for 45min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 200 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 40min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Example 4
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
58 parts of formaldehyde solution;
0.85 part of oxalic acid;
0.7 part of polyaluminium chloride;
1.3 parts of aluminum hydroxide;
3.3 parts of polysulfone resin;
0.9 part of silicone resin;
and 1.9 parts of EBS.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 85 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 90 ℃, finishing dripping the formaldehyde solution within 140min, then carrying out heat preservation reaction for 35min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 180 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 35min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Example 5
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
58 parts of formaldehyde solution;
1 part of oxalic acid;
0.8 part of polyaluminium chloride;
1.3 parts of aluminum hydroxide;
3.0 parts of polysulfone resin;
1.0 part of silicone resin;
EBS 2.0 parts.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 90 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 90 ℃, finishing dripping the formaldehyde solution within 120min, then carrying out heat preservation reaction for 30min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 150 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 20min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
Example 6
A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand comprises the following components in parts by weight:
100 parts of phenol;
58 parts of formaldehyde solution;
1 part of oxalic acid;
0.8 part of polyaluminium chloride;
1.3 parts of aluminum hydroxide;
3.0 parts of polysulfone resin;
1.0 part of silicone resin;
EBS 2.0 parts.
The preparation method comprises the following steps:
s1: adding phenol, oxalic acid, polyaluminium chloride and polysulfone resin into a reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution, wherein the oxalic acid is diluted by water and then added into the reaction kettle, the dilution ratio is 1:1, the polyaluminium chloride and the polysulfone resin are also diluted by water and then added into the reaction kettle, and the dilution ratio is 1: 1;
s2: opening a heating steam valve of an interlayer on the wall of the reaction kettle, heating the mixed solution to 90 ℃, then opening a valve of a dripping tank of the reaction kettle to drip the formaldehyde solution in the dripping tank of the reaction kettle into the reaction kettle, closing the heating steam valve and introducing cooling water to cool the reaction kettle after the temperature of the materials in the reaction kettle exceeds 90 ℃ and the liquid level is boiled, keeping the temperature of the liquid in the reaction kettle at 95 ℃, finishing dripping the formaldehyde solution in 140min, then carrying out heat preservation reaction for 38min to obtain a reaction liquid, and taking a reaction liquid sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃, wherein the phenol blowing time is 190 min;
s4: and (3) after phenol blowing is finished, adding aluminum hydroxide into the reaction kettle, stirring for 25min, adding silicon resin and EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
The resin binder prepared by the invention has excellent high-temperature performance, the precoated sand prepared by the resin has the characteristics of high heat strength, long heat-resistant time, small high-temperature deformation, low expansion, low gas evolution, slow gas evolution and the like, the defects of low melting point, low curing speed, low heat strength, large resin gas evolution and the like of the precoated sand are effectively overcome, the precoated sand prepared by the resin binder can better meet the production of complex thin-wall precise iron castings and iron castings with higher requirements, the surfaces of the castings are smooth and accurate in size, and the casting defects of sand sticking, deformation, heat cracking, air holes and the like can be effectively eliminated, so that the product quality is improved, and the production cost is reduced.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. A modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand is characterized in that: the binder comprises the following components: phenol, formaldehyde solution, catalyst, composite modifier, silicone resin and EBS.
2. The modified high temperature resistant, high strength phenolic resin binder for precoated sand according to claim 1, characterized in that: the composite modifier comprises a modifier A, a modifier B and a modifier C, wherein the modifier A is polyaluminium chloride, the modifier B is aluminum hydroxide, the modifier C is polysulfone resin, and the catalyst is oxalic acid.
3. The modified high-temperature-resistant high-strength phenolic resin binder for precoated sand according to claim 2, characterized in that: the bonding agent comprises the following components in parts by weight: 100 parts of phenol, 56-65 parts of formaldehyde solution, 0.8-1 part of oxalic acid, 0.5-0.8 part of polyaluminum chloride, 1-1.5 parts of aluminum hydroxide, 3.0-3.5 parts of polysulfone resin, 0.8-1.2 parts of silicon resin and 1.8-2.2 parts of EBS.
4. The modified high temperature resistant, high strength phenolic resin binder for precoated sand according to any one of claims 1 to 3, characterized in that: the mass concentration of the phenol is more than or equal to 99 percent, and the weight content of the formaldehyde in the formaldehyde solution is 36.5 to 37.8 percent.
5. The method for preparing the modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand according to any one of claims 1 to 4, which is characterized by comprising the following steps: the method comprises the following steps:
s1: adding phenol, a catalyst, a modifier A and a modifier C into the reaction kettle according to the proportion, and uniformly mixing the components by stirring to obtain a mixed solution;
s2: heating the mixed solution to 85-90 ℃, then dropwise adding a formaldehyde solution into the mixed solution, simultaneously cooling the reaction kettle to maintain the liquid in the reaction kettle in a certain temperature range, keeping the temperature for a certain time after the dropwise adding of the formaldehyde solution is finished to obtain a reaction solution, and taking a reaction solution sample for middle measurement;
s3: heating the reaction liquid and performing vacuum dehydration after the medium test is qualified, and opening a steam valve inserted into the kettle to blow phenol when the temperature is raised to 130 ℃;
s4: and adding the modifier B into the reaction kettle after phenol blowing is finished, stirring for 20-40min, adding the silicon resin and the EBS into the reaction kettle, uniformly stirring, and performing granulation operation to obtain a finished product.
6. The method for preparing the modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand according to claim 5, which is characterized by comprising the following steps: in step S2, the reaction kettle is cooled to maintain the temperature of the liquid in the reaction kettle at 90-100 ℃.
7. The method for preparing the modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand according to claim 5, which is characterized by comprising the following steps: and in the step S2, the formaldehyde solution is dropwise added within 150-120-one min, and after the dropwise addition, the reaction is carried out for 30-45min, and then the middle measurement is carried out.
8. The method for preparing the modified high-temperature-resistant and high-strength phenolic resin binder for precoated sand according to claim 5, which is characterized by comprising the following steps: the time for blowing phenol in step S3 was 150-200 min.
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| CN113600740A (en) * | 2021-08-31 | 2021-11-05 | 江西特欣实业有限公司 | Preparation method of high-strength low-gas-evolution precoated sand |
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