CN111940672A - Preparation method of energy-saving and environment-friendly cold core box resin for casting - Google Patents
Preparation method of energy-saving and environment-friendly cold core box resin for casting Download PDFInfo
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- CN111940672A CN111940672A CN202010820858.8A CN202010820858A CN111940672A CN 111940672 A CN111940672 A CN 111940672A CN 202010820858 A CN202010820858 A CN 202010820858A CN 111940672 A CN111940672 A CN 111940672A
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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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- 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
- B22C1/2273—Polyurethanes; Polyisocyanates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a preparation method of an energy-saving and environment-friendly cold core box resin for casting, which comprises a component A and a component B, wherein the component A is a phenolic resin solution, the component B is a polyisocyanate solution, and the phenolic resin adopted in the component A is alkylphenol modified phenolic resin.
Description
Technical Field
The invention belongs to the technical field of cold box resin preparation, and particularly relates to a preparation method of an energy-saving and environment-friendly cold box resin for casting.
Background
The cold-box resin is an adhesive for casting, is a material for bonding molding sand or core sand, and is almost a synthetic resin material in the manufacturing processes of self-hardening cores, shell cores, hot-core box cores, cold-core box cores, warm-core box cores and the like along with the continuous progress of a core-making technology in the core-making process.
In the casting industry, the existing binder of the cold core box is bi-component resin, and is solidified under the catalysis of triethylamine, dimethylethylamine, dimethylisopropylamine and the like. In order to ensure sufficient strength of the resin sand core, facilitate mold removal, handling and storage, the resin addition is generally high, between 1.0 and 2.0%. The resin addition amount is high, can lead to manufacturing cost's improvement, and organic volatile matter increases (unfavorable to the environment) during the casting, and too high resin addition amount also causes to pour the back metal mold on residual tar volume higher, has not only influenced casting quality, need constantly clear up the residual tar on the mould during production moreover, has reduced production efficiency.
Disclosure of Invention
The invention aims to: in order to solve the technical problems in reality, the preparation method of the energy-saving and environment-friendly cold core box resin for casting is provided.
The technical scheme adopted by the invention is as follows: the cold box resin consists of a component A and a component B, wherein the component A is a phenolic resin solution, the component B is a polymeric isocyanate solution, and the phenolic resin adopted in the component A is alkylphenol modified phenolic resin.
Wherein the alkylphenol-modified phenolic resin is a high ortho phenolic resin of the phenylene ether type having at least two-OH groups per molecule.
Wherein the alkylphenol-modified phenolic resin is obtained by reacting a mixture of phenol and alkylphenol with formaldehyde, para-formaldehyde, acetaldehyde, furfural and mixtures thereof.
Wherein the mixing proportion of the alkylphenol and the phenol is 1-50%, and the optimal proportion is 5-20%.
Wherein the alkylphenol has the following characteristics:
s1, presence of a branched or unbranched alkyl group in ortho or para position to the phenol;
s2, the number of the alkyl groups substituted on the phenol ring is only 1, and the number of the carbon atoms contained in the alkyl groups is 1-10;
s3 preferred alkylphenols are o/p-cresol, o/p-tert-butylphenol and o/p-nonylphenol.
Wherein the polymeric isocyanate has at least two-NCO groups per molecule.
Wherein the polymeric isocyanate is an aromatic polyisocyanate.
Wherein the component A and the component B are also provided with a solvent, and the solvent comprises one or more solvents selected from the following solvents:
-an aromatic hydrocarbon;
-fatty acid alkyl esters;
-diesters of dicarboxylic acids;
-propylene carbonate;
-an alkyl silicate.
The cold box resin is used for manufacturing a cast core or a cast mould, and the specific method comprises the following steps:
-mixing a moulding feedstock with component a and component B according to claim 1;
-moulding the resulting mixture comprising the moulding raw material and the components of the binder system;
-contacting the resulting molded mixture with a tertiary amine catalyst such that the binder system hardens and binds the molding material.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the present invention, the phenolic resin synthesized by using alkylphenol has lower molecular weight, so that more phenolic resin can be used in the component A because of the lower molecular weight, so that the viscosity of the component A is not too high to be beneficial to practical use, and the resin is not beneficial to uniformly coating the surface of sand grains.
2. In the invention, when the phenolic resin is used for manufacturing the cold core resin, the reactivity of the A component and the B two component (polyisocyanate) is higher, and the sufficient strength of the resin sand core can still be ensured under the condition of lower resin adding amount.
3. In the invention, the alkylphenol is used, so that the yield of the prepared phenolic resin is higher, the use cost of a user is reduced, and the release of harmful gas during sand mulling and casting can be reduced and the residual tar amount on a metal mould after casting can be reduced due to the reduction of the addition amount.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a technical scheme: a preparation method of energy-saving and environment-friendly cold core box resin for casting is characterized by comprising the following steps: the cold box resin consists of a component A and a component B, wherein the component A is a phenolic resin solution, the component B is a polyisocyanate solution, and the phenolic resin adopted in the component A is alkylphenol modified phenolic resin.
Example 1
51% of non-alkylphenol modified phenolic resin is used as the component A, the rest components are dibasic ester, aromatic solvent, methyl rapeseed oil, silane, hydrofluoric acid and the like, the viscosity (20 ℃) of the prepared resin is 70-90CP, and the component B adopts polyisocyanate solution.
Example 2
Component A was 55% o-cresol modified phenolic resin (wherein o-cresol/phenol was 1/10(wt/wt)), the remaining components were in accordance with the examples, and the resin was prepared to have a viscosity (20 ℃ C.) of 50-70CP, and component B was also prepared using a polyisocyanate solution.
Example 3
Component A was 57% o-cresol-modified phenolic resin (wherein o-cresol/phenol was 1/10(wt/wt)), the remainder being in accordance with the examples, and the resin prepared had a viscosity (20 ℃ C.) of 160-220CP and component B was likewise a polyisocyanate solution.
The test sand core is prepared according to the following method: to 3kg of Dahlin standard sand, 30g of the first binder set and 30g of the second binder set were added, and with the aid of the mixture obtained, the test specimens (test bars) were treated with triethylamine at a shot pressure of 0.45MPa, a post-gassing pressure of 0.25MPa for 10s and then flushed with air for 10 s.
In a test embodiment of the invention, the flexural and wet strength of a sand core prepared from the resin binder prepared as described above was measured using a Morek Lru-2e strength tester, and a "bar" block of the sand core was placed on a test support and a load was applied until the core broke. The load at this point is referred to as flexural strength, which is expressed in N/cm 2. The test items include: the strength 20s after core making, the strength 1h after core making, the strength 24h after core making and the moisture retention strength 24h after core making, wherein the moisture retention strength 24h is obtained by placing the test sand core in a high humidity environment (100% RH) for 24h and then performing a strength test to observe the influence of moisture on the strength of the sand core. The experimental data are shown in the following table:
| example 1 | Example 2 | Example 3 | |
| Flexural strength at 20s, N/cm2 | 222 | 263 | 312 |
| 1h bending strength, N/cm2 | 367 | 387 | 368 |
| Bending strength at 24h, N/cm2 | 425 | 428 | 382 |
| Moisturizing strength of 24 hours, N/cm2 | 241 | 260 | 220 |
From the test data in the table above, it can be seen that: the phenolic resin modified by the o-cresol is used, so that the resin sand core can still have enough strength under the condition of lower resin addition amount, the effect of reducing the use cost of a user is realized, the release of harmful gas during sand mixing and casting can be reduced due to the reduction of the addition amount, and the residual tar amount on a metal mold after casting can also be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A preparation method of energy-saving and environment-friendly cold core box resin for casting is characterized by comprising the following steps: the cold box resin consists of a component A and a component B, wherein the component A is a phenolic resin solution, the component B is a polymeric isocyanate solution, and the phenolic resin adopted in the component A is alkylphenol modified phenolic resin.
2. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 1, characterized by comprising the following steps: the alkylphenol-modified phenolic resin is a high ortho phenolic resin of the phenylene ether type having at least two-OH groups per molecule.
3. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 2, characterized by comprising the following steps: the alkylphenol modified phenolic resin is obtained by reacting a mixture of phenol and alkylphenol with formaldehyde, p-formaldehyde, acetaldehyde, furfural and a mixture thereof.
4. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 3, characterized by comprising the following steps: the mixing proportion of the alkylphenol and the phenol is 1-50%, and the optimal proportion is 5-20%.
5. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 4, characterized by comprising the following steps: the alkylphenol has the following characteristics:
s1, presence of a branched or unbranched alkyl group in ortho or para position to the phenol;
s2, the number of the alkyl groups substituted on the phenol ring is only 1, and the number of the carbon atoms contained in the alkyl groups is 1-10;
s3 preferred alkylphenols are o/p-cresol, o/p-tert-butylphenol and o/p-nonylphenol.
6. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 1, characterized by comprising the following steps: the polymeric isocyanate has at least two-NCO groups per molecule.
7. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 1, characterized by comprising the following steps: the polymeric isocyanate is an aromatic polyisocyanate.
8. The preparation method of the energy-saving and environment-friendly cold box resin for casting according to claim 1, characterized by comprising the following steps: the component A and the component B are also provided with a solvent, and the solvent comprises one or more solvents selected from the following solvents:
-an aromatic hydrocarbon;
-fatty acid alkyl esters;
-diesters of dicarboxylic acids;
-propylene carbonate;
-an alkyl silicate.
9. The preparation method of the energy-saving and environment-friendly cold box resin for casting as claimed in claim 1, wherein the preparation method comprises the following steps: the cold box resin is used for manufacturing a cast core or a cast mould, and the specific method comprises the following steps:
-mixing a moulding feedstock with component a and component B according to claim 1;
-moulding the resulting mixture comprising the moulding raw material and the components of the binder system;
-contacting the resulting molded mixture with a tertiary amine catalyst such that the binder system hardens and binds the molding material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820858.8A CN111940672A (en) | 2020-08-14 | 2020-08-14 | Preparation method of energy-saving and environment-friendly cold core box resin for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820858.8A CN111940672A (en) | 2020-08-14 | 2020-08-14 | Preparation method of energy-saving and environment-friendly cold core box resin for casting |
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| CN111940672A true CN111940672A (en) | 2020-11-17 |
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| CN202010820858.8A Pending CN111940672A (en) | 2020-08-14 | 2020-08-14 | Preparation method of energy-saving and environment-friendly cold core box resin for casting |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590229A (en) * | 1984-06-04 | 1986-05-20 | Ashland Oil, Inc. | Phenolic resin-polyisocyanate binder systems |
| CN103080179A (en) * | 2010-07-30 | 2013-05-01 | Ask化学品股份有限公司 | Binder system based on polyurethane for producing cores and casting molds using cyclic formaldehydes, molding material mixture, and method |
| CN106046283A (en) * | 2015-06-18 | 2016-10-26 | 济南圣泉集团股份有限公司 | High-ortho benzyl ether phenolic resin and preparation method thereof, and method for applying high-ortho benzyl ether phenolic resin to cold box binder |
| CN106694794A (en) * | 2017-03-14 | 2017-05-24 | 山东科技大学 | Novel triethylamine cold core box binding agent with low cost and low polar solvent dosage |
-
2020
- 2020-08-14 CN CN202010820858.8A patent/CN111940672A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590229A (en) * | 1984-06-04 | 1986-05-20 | Ashland Oil, Inc. | Phenolic resin-polyisocyanate binder systems |
| CN103080179A (en) * | 2010-07-30 | 2013-05-01 | Ask化学品股份有限公司 | Binder system based on polyurethane for producing cores and casting molds using cyclic formaldehydes, molding material mixture, and method |
| CN106046283A (en) * | 2015-06-18 | 2016-10-26 | 济南圣泉集团股份有限公司 | High-ortho benzyl ether phenolic resin and preparation method thereof, and method for applying high-ortho benzyl ether phenolic resin to cold box binder |
| 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 |
| CN106694794A (en) * | 2017-03-14 | 2017-05-24 | 山东科技大学 | Novel triethylamine cold core box binding agent with low cost and low polar solvent dosage |
Non-Patent Citations (1)
| Title |
|---|
| 黄仁和等: "铸造用聚氨酯粘合剂组份Ⅰ酚醛树脂合成研究", 《中国铸造装备与技术》 * |
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Application publication date: 20201117 |
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