Production method for furan resin for 3D (three dimensional) sand mould printing casting

Abstract

The invention relates to a production method for furan resin and particularly relates to a production method for furan resin for 3D (three dimensional) sand mould printing casting. The production method is characterized by comprising the following steps: starting a stirrer, adding formaldehyde aqueous liquor, adding furfuryl alcohol into a reaction kettle, and regulating pH value of feed liquid by formic acid; opening a steam valve, slowly heating, timing and preserving heat; after heat preservation is ended, cooling, adding m-cresol, regulating the pH value by sodium hydroxide, heating, timing and preserving heat; after heat preservation is ended, adding furfuryl alcohol and dehydrating in vacuum; after dehydrating is ended, adding furfuryl alcohol and a modifier; opening the steam valve, slowly heating, timing and preserving the heat; after heat preservation is ended, adding furfuryl alcohol and a coupling agent while cooling to 70 DEG C, adding alkaline to regulate the pH value, and discharging after continuously stirring; and packaging and warehousing. The method disclosed by the invention is unique and capable of realizing quick hardening.

Description

technical field

[0001] The invention relates to a production method of furan resin, in particular to a production method of furan resin for 3D sand printing casting. Background technique

[0002] 3D printing technology is an advanced manufacturing technology developed in the 1990s. Since the advent of this technology, it has been widely used in the manufacturing industry in developed countries, and a new technical field has emerged. Since 2013 ’s first metal pistol printing came out, and 3D technology set off a climax again. 3D printing, commonly known as rapid prototyping, is divided into many different technologies according to different printing processes, which are used in various industries. The general process of 3D sand mold rapid printing is: the catalyst or curing agent is pre-mixed with sand, which requires high sand, and the roller is pre-laid with a very thin layer of sand on the printing platform, and then the inkjet head, many inkjet heads are densely distribu...

Examples

Embodiment 1

[0022] Embodiment one: a kind of production method of furan resin for 3D sand printing casting, the method comprises the steps:

[0023] Ⅰ. Start the mixer, add 1.5% formaldehyde solution, add 12.5% ​​furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0024] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 150 minutes;

[0025] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 7.7% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 60 minutes;

[0026] Ⅳ. At the end of the heat preservation, add 12.5% ​​furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0027] Ⅴ. After dehydration, add 18.5% furfuryl alcohol and 3% modifier;

[0028] Ⅵ. Open the steam valve, slowly heat up to 88-96°C ...

Embodiment 2

[0031] Embodiment two: a kind of production method of furan resin for 3D sand printing casting, the method comprises the following steps:

[0032] Ⅰ. Start the mixer, add 6.6% formaldehyde solution, add 11% furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0033] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 60 minutes;

[0034] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 9.2% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 150 minutes;

[0035] Ⅳ. At the end of the heat preservation, add 11% furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0036] Ⅴ. After dehydration, add 17% furfuryl alcohol and 6% modifier;

[0037] Ⅵ. Open the steam valve, slowly heat up to 88-96°C ...

Embodiment 3

[0040] Embodiment three: a kind of production method of furan resin for 3D sand printing casting, the method comprises the following steps:

[0041] Ⅰ. Start the mixer, add 4.5% formaldehyde solution, add 11% furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0042] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 60 minutes;

[0043] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 14% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 150 minutes;

[0044] Ⅳ. At the end of the heat preservation, add 11% furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0045] Ⅴ. After dehydration, add 17% furfuryl alcohol and 3% modifier;

[0046] Ⅵ. Open the steam valve, slowly heat up to 88-96°C...

technical field

[0001] The invention relates to a production method of furan resin, in particular to a production method of furan resin for 3D sand printing casting. Background technique

[0002] 3D printing technology is an advanced manufacturing technology developed in the 1990s. Since the advent of this technology, it has been widely used in the manufacturing industry in developed countries, and a new technical field has emerged. Since 2013 ’s first metal pistol printing came out, and 3D technology set off a climax again. 3D printing, commonly known as rapid prototyping, is divided into many different technologies according to different printing processes, which are used in various industries. The general process of 3D sand mold rapid printing is: the catalyst or curing agent is pre-mixed with sand, which requires high sand, and the roller is pre-laid with a very thin layer of sand on the printing platform, and then the inkjet head, many inkjet heads are densely distribu...

Examples

Embodiment 1

[0022] Embodiment one: a kind of production method of furan resin for 3D sand printing casting, the method comprises the steps:

[0023] Ⅰ. Start the mixer, add 1.5% formaldehyde solution, add 12.5% ​​furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0024] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 150 minutes;

[0025] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 7.7% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 60 minutes;

[0026] Ⅳ. At the end of the heat preservation, add 12.5% ​​furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0027] Ⅴ. After dehydration, add 18.5% furfuryl alcohol and 3% modifier;

[0028] Ⅵ. Open the steam valve, slowly heat up to 88-96°C ...

Embodiment 2

[0031] Embodiment two: a kind of production method of furan resin for 3D sand printing casting, the method comprises the following steps:

[0032] Ⅰ. Start the mixer, add 6.6% formaldehyde solution, add 11% furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0033] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 60 minutes;

[0034] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 9.2% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 150 minutes;

[0035] Ⅳ. At the end of the heat preservation, add 11% furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0036] Ⅴ. After dehydration, add 17% furfuryl alcohol and 6% modifier;

[0037] Ⅵ. Open the steam valve, slowly heat up to 88-96°C ...

Embodiment 3

[0040] Embodiment three: a kind of production method of furan resin for 3D sand printing casting, the method comprises the following steps:

[0041] Ⅰ. Start the mixer, add 4.5% formaldehyde solution, add 11% furfuryl alcohol into the reaction kettle, and adjust the pH value of the feed solution to 2-5 with formic acid;

[0042] Ⅱ. Open the steam valve, slowly heat up to 95-97°C within 60-90 minutes, and keep the temperature for 60 minutes;

[0043] Ⅲ. At the end of the heat preservation, lower the temperature to 90°C, add 14% m-cresol, adjust the pH to 8-9.5 with sodium hydroxide, raise the temperature to 95-97°C within 40-60 minutes, and keep the temperature for 150 minutes;

[0044] Ⅳ. At the end of the heat preservation, add 11% furfuryl alcohol, vacuum dehydrate, and the dehydration amount is 70% of the weight of the formaldehyde solution;

[0045] Ⅴ. After dehydration, add 17% furfuryl alcohol and 3% modifier;

[0046] Ⅵ. Open the steam valve, slowly heat up to 88-96°C...