CN112759733A - Preparation method of low-odor high-strength environment-friendly furan resin - Google Patents
Preparation method of low-odor high-strength environment-friendly furan resin Download PDFInfo
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- CN112759733A CN112759733A CN202011546962.9A CN202011546962A CN112759733A CN 112759733 A CN112759733 A CN 112759733A CN 202011546962 A CN202011546962 A CN 202011546962A CN 112759733 A CN112759733 A CN 112759733A
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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
- 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
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Abstract
The invention is a low-odor high-strength environment-friendly furan resin preparation method, starting from the reaction mechanism, reducing the content of free formaldehyde in the furan resin by controlling the synthesis process and adding polyvinyl alcohol, urea and silane in the reaction process, thereby producing the low-odor high-strength environment-friendly furan resin; the invention ensures that the formaldehyde in the materials reacts fully and thoroughly by optimizing the proportion of the raw materials for producing the resin, thereby reducing the free formaldehyde; in each stage of alkalinity and acidity, free formaldehyde is reduced to a lower level by controlling the reaction temperature, the reaction time and the pH value of reactants. The invention has reasonable process, stable resin quality, low free aldehyde and little smell, and greatly improves the working environment.
Description
Technical Field
The invention relates to the technical field of casting coatings, in particular to a preparation method of low-odor high-strength environment-friendly furan resin.
Background
The furan resin is urea-formaldehyde furan resin with furan ring, which is condensed by using formaldehyde, urea and furfuryl alcohol as main raw materials, and has the characteristics of high hardening speed, high strength, good collapsibility and the like. The self-hardening furan resin for casting has been produced and applied for more than ten years in China, although the effect is still good, the main technical indexes have certain difference compared with similar products in industrially developed countries, and particularly, the resin has large smell and higher content of free formaldehyde, seriously pollutes the operating environment and has great harm to the health of field workers.
Disclosure of Invention
The invention aims to develop a preparation method of low-odor high-strength environment-friendly furan resin.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding sodium hydroxide solution into the mixture obtained in the second step, and adjusting the pH value until the pH value is 8.8-9.2;
first heating
Heating the mixture in the third step at 90-94 deg.c for 2 hr;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 3.8-4.2;
sixth heating
Heating the mixture in the fifth step at the temperature of 100 ℃ and 105 ℃, and preserving the heat for 1.5 hours;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 8.4-9.6;
(iii) heating up for the third time
Heating the mixture in the step (c) at 90-94 ℃, and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
In particular, the parts by weight of the paraformaldehyde, the melamine, the urea and the furfuryl alcohol in the step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
In particular, the mixture in step (ii) is stirred for at least 30 minutes.
In particular, the weight parts of the polyvinyl alcohol and the urea added in the step (c) are respectively 5 parts and 15 parts.
In particular, the weight part of the silane in the step ninthly is 5 parts.
The invention has the beneficial effects that: starting from the reaction mechanism, the invention reduces the content of free formaldehyde in the furan resin by controlling the synthesis process and adding polyvinyl alcohol, urea and silane in the reaction process, thereby producing the environment-friendly furan resin with low odor and high strength; the invention ensures that the formaldehyde in the materials reacts fully and thoroughly by optimizing the proportion of the raw materials for producing the resin, thereby reducing the free formaldehyde; in each stage of alkalinity and acidity, free formaldehyde is reduced to a lower level by controlling the reaction temperature, the reaction time and the pH value of reactants. The invention has reasonable process, stable resin quality, low free aldehyde and little smell, and greatly improves the working environment.
Detailed Description
The invention is further illustrated by the following examples:
a preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding sodium hydroxide solution into the mixture obtained in the second step, and adjusting the pH value until the pH value is 8.8-9.2;
first heating
Heating the mixture in the third step at 90-94 deg.c for 2 hr;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 3.8-4.2;
sixth heating
Heating the mixture in the fifth step at the temperature of 100 ℃ and 105 ℃, and preserving the heat for 1.5 hours;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 8.4-9.6;
(iii) heating up for the third time
Heating the mixture in the step (c) at 90-94 ℃, and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
In particular, the parts by weight of the paraformaldehyde, the melamine, the urea and the furfuryl alcohol in the step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
In particular, the mixture in step (ii) is stirred for at least 30 minutes.
In particular, the weight parts of the polyvinyl alcohol and the urea added in the step (c) are respectively 5 parts and 15 parts.
In particular, the weight part of the silane in the step ninthly is 5 parts.
Example 1
A preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding a sodium hydroxide solution into the mixture obtained in the step II, and adjusting the pH value until the pH value is 8.8;
first heating
Heating the mixture in the third step at 90 ℃ and preserving heat for 2 hours;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 3.8;
sixth heating
Heating the mixture in the fifth step at 100 deg.c for 1.5 hr;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 8.4;
(iii) heating up for the third time
Heating the mixture in the step (c) at 90 ℃ and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
In particular, the parts by weight of the paraformaldehyde, the melamine, the urea and the furfuryl alcohol in the step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
In particular, the mixture in step (ii) is stirred for at least 30 minutes.
In particular, the weight parts of the polyvinyl alcohol and the urea added in the step (c) are respectively 5 parts and 15 parts.
In particular, the weight part of the silane in the step ninthly is 5 parts.
Example 2
A preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding a sodium hydroxide solution into the mixture obtained in the step II, and adjusting the pH value until the pH value is 9.2;
first heating
Heating the mixture in the third step at 94 ℃ and keeping the temperature for 2 hours;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 4.2;
sixth heating
Heating the mixture in the fifth step at 105 deg.c for 1.5 hr;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 9.6;
(iii) heating up for the third time
Heating the mixture in the step (c) at 94 ℃ and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
In particular, the parts by weight of the paraformaldehyde, the melamine, the urea and the furfuryl alcohol in the step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
In particular, the mixture in step (ii) is stirred for at least 30 minutes.
In particular, the weight parts of the polyvinyl alcohol and the urea added in the step (c) are respectively 5 parts and 15 parts.
In particular, the weight part of the silane in the step ninthly is 5 parts.
Example 3
A preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding a sodium hydroxide solution into the mixture obtained in the step II, and adjusting the pH value until the pH value is 9;
first heating
Heating the mixture in the third step at 92 ℃ and preserving heat for 2 hours;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 3.9;
sixth heating
Heating the mixture in the fifth step at 103 deg.c for 1.5 hr;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 9.2;
(iii) heating up for the third time
Heating the mixture in the step (c) at 93 ℃, and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
In particular, the parts by weight of the paraformaldehyde, the melamine, the urea and the furfuryl alcohol in the step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
In particular, the mixture in step (ii) is stirred for at least 30 minutes.
In particular, the weight parts of the polyvinyl alcohol and the urea added in the step (c) are respectively 5 parts and 15 parts.
In particular, the weight part of the silane in the step ninthly is 5 parts.
The invention has been described above by way of example; it is to be understood that the invention is not limited to the specific embodiments described above; various improvements are only needed to be made by adopting the method conception and the technical scheme of the invention; or directly applied to other occasions without improvement; are within the scope of the invention.
Claims (5)
1. A preparation method of low-odor high-strength environment-friendly furan resin is characterized by comprising the following steps;
preparing raw materials
Preparing paraformaldehyde, furfuryl alcohol, urea, silane, polyvinyl alcohol, melamine, methanol, formic acid and sodium hydroxide solution;
② stirring
Adding paraformaldehyde, melamine, urea and furfuryl alcohol into a stirrer, starting stirring, and uniformly stirring the mixture;
third alkaline adjustment
Adding sodium hydroxide solution into the mixture obtained in the second step, and adjusting the pH value until the pH value is 8.8-9.2;
first heating
Heating the mixture in the third step at 90-94 deg.c for 2 hr;
fifth acidity regulation
Cooling the mixture obtained in the step (IV), cooling to 60 ℃, adding formic acid, and adjusting the pH value until the pH value is 3.8-4.2;
sixth heating
Heating the mixture in the fifth step at the temperature of 100 ℃ and 105 ℃, and preserving the heat for 1.5 hours;
seventh alkaline adjustment
Cooling the mixture to below 60 ℃, adding polyvinyl alcohol and urea, adding a sodium hydroxide solution, and adjusting the pH value until the pH value is 8.4-9.6;
(iii) heating up for the third time
Heating the mixture in the step (c) at 90-94 ℃, and keeping the temperature for 30 minutes;
ninthly cooling
Cooling the mixture in the step (V) to below 50 ℃, adding silane, and stirring for 30 minutes;
discharging the red.
2. The method for preparing environment-friendly furan resin with low odor and high strength as claimed in claim 1, wherein the weight parts of paraformaldehyde, melamine, urea and furfuryl alcohol in step (II) are respectively 100 parts, 4 parts, 60 parts and 200 parts.
3. The method for preparing low-odor high-strength environment-friendly furan resin according to claim 1, wherein the mixture in the step (II) is stirred for at least 30 minutes.
4. The method for preparing low-odor high-strength environment-friendly furan resin according to claim 1, wherein the weight parts of polyvinyl alcohol and urea added in step (c) are 5 parts and 15 parts, respectively.
5. The method for preparing low-odor high-strength environment-friendly furan resin as claimed in claim 1, wherein the weight portion of silane in step nini is 5 parts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011546962.9A CN112759733A (en) | 2020-12-24 | 2020-12-24 | Preparation method of low-odor high-strength environment-friendly furan resin |
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| CN202011546962.9A CN112759733A (en) | 2020-12-24 | 2020-12-24 | Preparation method of low-odor high-strength environment-friendly furan resin |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1403827A (en) * | 1972-11-17 | 1975-08-28 | Ashland Oil Inc | Foundry binder containing ketone-aldehyde reaction products and polymers |
| CN102161741A (en) * | 2011-01-27 | 2011-08-24 | 天津市铸诚铸造辅料有限公司 | Preparation method of furan resin for casting |
| CN104086733A (en) * | 2014-06-26 | 2014-10-08 | 宁夏共享装备有限公司 | Production method of furan resin without dehydration property |
| 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 |
| EP3085724A1 (en) * | 2015-04-24 | 2016-10-26 | Cavenaghi SPA | Foundry binder system with a low formaldehyde content and process for obtaining it |
| CN110862500A (en) * | 2019-11-28 | 2020-03-06 | 山东永创材料科技有限公司 | Preparation method of furan resin with low nitrogen and low free furfuryl alcohol |
-
2020
- 2020-12-24 CN CN202011546962.9A patent/CN112759733A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1403827A (en) * | 1972-11-17 | 1975-08-28 | Ashland Oil Inc | Foundry binder containing ketone-aldehyde reaction products and polymers |
| CN102161741A (en) * | 2011-01-27 | 2011-08-24 | 天津市铸诚铸造辅料有限公司 | Preparation method of furan resin for casting |
| CN104086733A (en) * | 2014-06-26 | 2014-10-08 | 宁夏共享装备有限公司 | Production method of furan resin without dehydration property |
| 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 |
| EP3085724A1 (en) * | 2015-04-24 | 2016-10-26 | Cavenaghi SPA | Foundry binder system with a low formaldehyde content and process for obtaining it |
| CN110862500A (en) * | 2019-11-28 | 2020-03-06 | 山东永创材料科技有限公司 | Preparation method of furan resin with low nitrogen and low free furfuryl alcohol |
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Application publication date: 20210507 |
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