CN115109216A - High-viscosity furan resin for casting and preparation method thereof - Google Patents
High-viscosity furan resin for casting and preparation method thereof Download PDFInfo
- Publication number
- CN115109216A CN115109216A CN202210799554.7A CN202210799554A CN115109216A CN 115109216 A CN115109216 A CN 115109216A CN 202210799554 A CN202210799554 A CN 202210799554A CN 115109216 A CN115109216 A CN 115109216A
- Authority
- CN
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- Prior art keywords
- furan resin
- casting
- viscosity
- parts
- furfuryl alcohol
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- Pending
Links
- 239000007849 furan resin Substances 0.000 title claims abstract description 26
- 238000005266 casting Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 72
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 35
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003513 alkali Substances 0.000 claims abstract description 18
- 239000004202 carbamide Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 229930040373 Paraformaldehyde Natural products 0.000 claims abstract description 13
- 229920002866 paraformaldehyde Polymers 0.000 claims abstract description 13
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910000077 silane Inorganic materials 0.000 claims abstract description 12
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 235000014633 carbohydrates Nutrition 0.000 claims description 4
- 150000001720 carbohydrates Chemical class 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 claims description 3
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 claims description 3
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 claims description 3
- 239000000811 xylitol Substances 0.000 claims description 3
- 229960002675 xylitol Drugs 0.000 claims description 3
- 235000010447 xylitol Nutrition 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 150000008065 acid anhydrides Chemical class 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 150000007524 organic acids Chemical class 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- -1 xylitol Chemical class 0.000 description 1
Classifications
-
- 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
- C08G16/00—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00
- C08G16/02—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes
- C08G16/025—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with heterocyclic organic compounds
- C08G16/0256—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with heterocyclic organic compounds containing oxygen in the ring
- C08G16/0262—Furfuryl alcohol
-
- 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
- B22C1/224—Furan polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to high-viscosity furan resin for casting and a preparation method thereof, wherein the high-viscosity furan resin comprises the following raw materials: formaldehyde and paraformaldehyde (one or two of them can be used), urea, furfuryl alcohol, urotropine, alkali liquor, acid liquor and silane. The selected raw materials are necessary, so that the production cost of an enterprise can be reduced to the greatest extent, the quality and the efficiency are improved, the proportion of the raw materials can be flexibly adjusted according to the requirement of a customer on the product quality, the production requirement of the customer is met to the greatest extent, and the production cost is reduced.
Description
Technical Field
The invention relates to a binder, in particular to a high-viscosity furan resin for casting and a preparation method thereof.
Background
Furan resin is the most used polycondensation resin in casting production so far, and the dosage of furan resin is over 50 million tons each year. At present, the traditional furan resin production generally uses an alkali-acid-alkali method, but the invention selects an acidification method for production according to the requirements of customers on high product quality viscosity and low cost, and has higher viscosity under the same quality compared with the traditional furan resin production alkali-acid-alkali method; meanwhile, the low cost requirement is considered, and the furfuryl alcohol content which accounts for the highest cost in the raw materials is reduced, so that the requirements of low cost, quality improvement and efficiency improvement are met.
Disclosure of Invention
In view of this, the invention provides a furan resin with high viscosity for casting and a preparation method thereof.
A high-viscosity furan resin for casting comprises the following raw materials:
formaldehyde, paraformaldehyde, urea, urotropine, furfuryl alcohol, alkali liquor, acid liquor and silane.
And the high-viscosity furan resin for casting comprises the following raw materials in parts by weight:
0-45 parts of formaldehyde, 1-17 parts of paraformaldehyde, 1-16 parts of urea, 25-55 parts of furfuryl alcohol, urotropine, alkali liquor, acid liquor and silane.
The preparation method of the high-viscosity furan resin for casting comprises the following steps:
(1) primary feeding: closing a discharge valve at the bottom of the kettle, opening a charging valve, adding a proper amount of formaldehyde and paraformaldehyde, adding a certain proportion of urea and a small amount of urotropine, adding part of furfuryl alcohol and other carbohydrates, then adding acid liquor, closing the charging valve, and starting a stirrer;
(2) primary heat preservation: opening a steam valve, keeping the temperature in the kettle between 95 and 100 ℃, and preserving the heat for 50 to 120 minutes;
(3) secondary feeding: adding urea and furfuryl alcohol in a certain proportion, cooling and adding acid liquor;
(4) secondary heat preservation: opening a steam valve, keeping the temperature in the kettle between 95 and 104 ℃, and preserving the heat for 50 to 100 minutes;
(5) and (3) feeding for three times: adding the rest urea and furfuryl alcohol in a certain proportion;
(6) and (3) heat preservation for three times: opening a steam valve, keeping the temperature in the kettle between 70 and 100 ℃, and preserving the heat for 20 to 60 minutes;
(7) four times of feeding: adding alkali liquor at 76 ℃, adding the rest furfuryl alcohol, cooling to below 50 ℃, adding a proper amount of ammonia water, methanol and silane, uniformly stirring, and discharging to obtain the high-viscosity furan resin for casting.
It should be noted that, in the present invention, the urea is added in 3 times to better react with formaldehyde (paraformaldehyde) completely, so as to reduce the content of free formaldehyde in the finished product; and the furfuryl alcohol is added in 4 times to form a spatial network structure in the product.
Preferably, the raw material formaldehyde is industrial formaldehyde, commonly called formalin, and the concentration is greater than or equal to 36.5%.
Preferably, the source of the raw material paraformaldehyde comprises domestic and foreign countries, and the mass percentage is more than or equal to 96%.
Preferably, the raw materials of formaldehyde and paraformaldehyde can be selected from one or two of the raw materials according to the requirements of customers on product quality and by combining the production process of enterprises.
Preferably, the raw material furfuryl alcohol is greater than or equal to 99% in mass percentage.
Preferably, the alkali liquor comprises inorganic alkali liquor and organic alkali liquor, various amines or ammonia substances and substances which are alkaline in the solution, and the alkali liquor comprises but is not limited to one or more of the following raw materials: such as sodium hydroxide, potassium hydroxide, triethanolamine, ammonia water, etc.
Preferably, the acid solution comprises inorganic acid solution and organic acid solution, various acid anhydrides and substances which are acidic in the solution, including but not limited to one or more of the following raw materials: such as hydrochloric acid, formic acid, maleic anhydride, and the like.
Preferably, the silane includes but is not limited to one or more of the following raw materials: various types of silane coupling agents (e.g., 602, 550, etc.), and various types of red silanes.
In addition, in the step (1), other carbohydrates including xylitol, sugar and various alcohols, and byproducts in the production of sugar can be optionally added according to the requirements of customers.
According to the technical scheme, compared with the prior art, the high-viscosity furan resin for casting and the preparation method thereof provided by the invention have the following excellent effects:
1. part of paraformaldehyde replaces part or all of industrial formaldehyde aqueous solution, so that a large amount of volatile formaldehyde gas is avoided, the environment and the physical health of workers are protected, and the transportation cost is saved.
2. The selected raw materials are all necessary, so that the production cost of an enterprise is reduced to the maximum extent, and the quality and the efficiency are improved.
3. The proportion of the raw materials can be flexibly adjusted according to the requirements of customers on the product quality, the production requirements of the customers are met to the maximum extent, and the production cost is reduced.
The analysis shows that the high-viscosity furan resin disclosed by the invention has no waste water, waste gas and waste residue in the production process, and is scientific and environment-friendly.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a preparation method of high-viscosity furan resin for casting.
The technical solution of the present invention will be further described with reference to the following specific examples.
Example 1
A method for preparing high-viscosity furan resin for casting comprises the following steps:
(1) primary feeding: closing a discharge valve at the bottom of the kettle, opening a charging valve, adding 32 parts of formaldehyde and 4 parts of paraformaldehyde, adding 12.5 parts of urea and a small amount of urotropine, adding 10.5 parts of furfuryl alcohol, adding acid liquor, closing the charging valve, and starting a stirrer;
(2) primary heat preservation: opening a steam valve, keeping the temperature in the kettle at 95 ℃, and keeping the temperature for 120 minutes;
(3) secondary feeding: adding 1.9 parts of urea, adding 6.3 parts of furfuryl alcohol, cooling, and adding acid liquor;
(4) secondary heat preservation: opening a steam valve, keeping the temperature in the kettle at 95 ℃, and keeping the temperature for 100 minutes;
(5) and (3) feeding for the third time: adding the rest 1.7 parts of urea and 6.3 parts of furfuryl alcohol;
(6) and (3) heat preservation for three times: opening a steam valve, keeping the temperature in the kettle at 70 ℃, and preserving the heat for 60 minutes;
(7) four times of feeding: adding alkali liquor at 76 ℃, adding the rest 12.5 parts of furfuryl alcohol, cooling to below 50 ℃, adding 1.7 parts of ammonia water, 9 parts of methanol and 1.3 parts of silane, uniformly stirring, and discharging.
Example 2
A method for preparing high-viscosity furan resin for casting comprises the following steps:
(1) primary feeding: closing a discharge valve at the bottom of the kettle, opening a charging valve, adding 31 parts of formaldehyde and 4.7 parts of paraformaldehyde, adding 12 parts of urea and a small amount of urotropine, adding 10.3 parts of furfuryl alcohol and 2.7 parts of xylitol, adding acid liquor, closing the charging valve, and starting a stirrer;
(2) primary heat preservation: opening a steam valve, keeping the temperature in the kettle at 95 ℃, and keeping the temperature for 120 minutes;
(3) secondary feeding: adding 2 parts of urea, adding 6.2 parts of furfuryl alcohol, cooling and adding acid liquor;
(4) secondary heat preservation: opening a steam valve, keeping the temperature in the kettle at 95 ℃, and keeping the temperature for 100 minutes;
(5) and (3) feeding for three times: the remaining 2 parts of urea are added and 6.2 parts of furfuryl alcohol are added.
(6) And (3) heat preservation for three times: opening a steam valve, keeping the temperature in the kettle at 70 ℃, and preserving the heat for 60 minutes;
(7) four times of feeding: adding alkali liquor at 76 ℃, adding the rest 10.3 parts of furfuryl alcohol, cooling to below 50 ℃, adding 1.7 parts of ammonia water, 8.8 parts of methanol and 1.2 parts of silane, uniformly stirring, and discharging.
The devices used in this patent are all common devices in the art, and are not described herein again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The high-viscosity furan resin for casting is characterized by comprising the following raw materials:
formaldehyde, paraformaldehyde, urea, furfuryl alcohol, urotropine, alkali liquor, acid liquor and silane.
2. The high-viscosity furan resin for casting as claimed in claim 1, comprising the following raw materials in parts by weight: 0-45 parts of formaldehyde, 1-17 parts of paraformaldehyde, 1-16 parts of urea, 25-55 parts of furfuryl alcohol, urotropine, alkali liquor, acid liquor and silane.
3. A furan resin with high viscosity for casting as claimed in claim 1 or 2, wherein said alkali solution comprises inorganic alkali solution and organic alkali solution, various amines or ammonia substances and substances which are alkaline in solution.
4. A furan resin with high viscosity for casting according to claim 1 or 2, wherein the acid solution comprises inorganic acid solution and organic acid solution, various acid anhydrides and acidic substances in solution.
5. The furan resin with high viscosity for casting as claimed in claim 1 or 2, wherein the silane is at least one of a silane coupling agent and red silane.
6. The method for preparing furan resin with high viscosity for casting according to claim 1 or 2, comprising the following steps:
(1) primary feeding: closing a discharge valve at the bottom of the kettle, opening a feed valve, adding a proper amount of formaldehyde and paraformaldehyde, adding a certain proportion of urea and a small amount of urotropine, adding part of furfuryl alcohol and other carbohydrates, then adding acid liquor, closing the feed valve, and starting a stirrer;
(2) primary heat preservation: opening a steam valve, keeping the temperature in the kettle between 95 and 100 ℃, and preserving the heat for 50 to 120 minutes;
(3) secondary feeding: adding urea and furfuryl alcohol in a certain proportion, cooling and adding acid liquor;
(4) secondary heat preservation: opening a steam valve, keeping the temperature in the kettle between 95 and 104 ℃, and preserving the heat for 50 to 100 minutes;
(5) and (3) feeding for three times: adding the rest urea and furfuryl alcohol in a certain proportion;
(6) and (3) heat preservation for three times: opening a steam valve, keeping the temperature in the kettle between 70 and 100 ℃, and preserving the heat for 20 to 60 minutes;
(7) four times of feeding: adding alkali liquor at 76 ℃, adding the residual furfuryl alcohol, cooling to below 50 ℃, adding a proper amount of ammonia water, methanol and silane, uniformly stirring, and discharging to obtain the high-viscosity furan resin for casting.
7. The method according to claim 6, wherein in the step (1), the other carbohydrates include xylitol, sugar and various alcohols or by-products of sugar production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210799554.7A CN115109216A (en) | 2022-07-06 | 2022-07-06 | High-viscosity furan resin for casting and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210799554.7A CN115109216A (en) | 2022-07-06 | 2022-07-06 | High-viscosity furan resin for casting and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115109216A true CN115109216A (en) | 2022-09-27 |
Family
ID=83333095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210799554.7A Pending CN115109216A (en) | 2022-07-06 | 2022-07-06 | High-viscosity furan resin for casting and preparation method thereof |
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| Country | Link |
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| CN (1) | CN115109216A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516482A (en) * | 2011-12-09 | 2012-06-27 | 宁夏共享集团有限责任公司 | Production technology of furan resin for casting |
| CN102775572A (en) * | 2012-07-26 | 2012-11-14 | 宁夏共享集团有限责任公司 | Production technology of furan resin used for casting steel |
| CN103819643A (en) * | 2014-01-17 | 2014-05-28 | 山东时风（集团）有限责任公司 | Furan resin for casting and preparation method thereof |
| CN104193935A (en) * | 2014-08-29 | 2014-12-10 | 玉林市兰科铸造材料有限公司 | Furan resin for cast steel and synthesis method thereof |
| CN105037671A (en) * | 2015-07-15 | 2015-11-11 | 天津宁康科技有限公司 | Long-storage casting furan resin with low furfuryl alcohol content and preparation method thereof |
-
2022
- 2022-07-06 CN CN202210799554.7A patent/CN115109216A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516482A (en) * | 2011-12-09 | 2012-06-27 | 宁夏共享集团有限责任公司 | Production technology of furan resin for casting |
| CN102775572A (en) * | 2012-07-26 | 2012-11-14 | 宁夏共享集团有限责任公司 | Production technology of furan resin used for casting steel |
| CN103819643A (en) * | 2014-01-17 | 2014-05-28 | 山东时风（集团）有限责任公司 | Furan resin for casting and preparation method thereof |
| CN104193935A (en) * | 2014-08-29 | 2014-12-10 | 玉林市兰科铸造材料有限公司 | Furan resin for cast steel and synthesis method thereof |
| CN105037671A (en) * | 2015-07-15 | 2015-11-11 | 天津宁康科技有限公司 | Long-storage casting furan resin with low furfuryl alcohol content and preparation method thereof |
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