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Preparation method of nitrogen-free furan resin

A nitrogen-furan and resin technology is applied in the field of preparation of nitrogen-free furan resin, which can solve the problems of hindering the application of furan resin sand process, adding a large amount of resin, harsh production environment, etc., so as to reduce the harm of the environment and workers, and achieve good fluidity. , the effect of fast gel curing

Inactive Publication Date: 2019-06-07
山东永创材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of nitrogen-free furan resin has always had the disadvantages of high viscosity, high free formaldehyde, and low tensile strength, so that in casting production, the production environment is harsh, the amount of resin added is large, and the amount of gas generation is large, resulting in some casting defects
Thereby hindering the application of furan resin sand technology in the production of steel castings in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of nitrogen-free furan resin, comprising the following steps:

[0021] (1) Add solid formaldehyde and furfuryl alcohol into the reaction kettle, stir and mix, and adjust the pH value to 4.5-6 with acid;

[0022] (2) Add catalyst zinc acetate under the above-mentioned acidic conditions, carry out catalytic reaction at 130-150° C., and keep the temperature for 3-5 hours to obtain a polymer;

[0023] (3) Add aldehyde remover and coupling agent, stir and mix evenly;

[0024] (4) Adjust the pH value to neutrality with sodium hydroxide solution, continue to stir and discharge to obtain the product.

[0025] In parts by weight, the parts by weight of the raw materials in each of the above reaction stages are: 7 parts of solid formaldehyde, 98 parts of furfuryl alcohol, 0.3 parts of zinc acetate, 8 parts of aldehyde removing agent, and 0.6 part of coupling agent.

[0026] The solid formaldehyde is paraformaldehyde with a low degree of polymerization, and ...

Embodiment 2

[0028] A preparation method of nitrogen-free furan resin, comprising the following steps:

[0029] (1) Add solid formaldehyde and furfuryl alcohol into the reaction kettle, stir and mix, and adjust the pH value to 4.5-6 with acid;

[0030] (2) Add catalyst zinc acetate under the above-mentioned acidic conditions, carry out catalytic reaction at 130-150° C., and keep the temperature for 3-5 hours to obtain a polymer;

[0031] (3) Add aldehyde remover and coupling agent, stir and mix evenly;

[0032] (4) Adjust the pH value to neutrality with sodium hydroxide solution, continue to stir and discharge to obtain the product.

[0033] In parts by weight, the parts by weight of the raw materials in each of the above reaction stages are: 5 parts of solid formaldehyde, 95 parts of furfuryl alcohol, 0.2 part of zinc acetate, 6 parts of aldehyde removing agent, and 0.4 part of coupling agent.

[0034] The solid formaldehyde is paraformaldehyde with a low degree of polymerization, and t...

Embodiment 3

[0036] A preparation method of nitrogen-free furan resin, comprising the following steps:

[0037] (1) Add solid formaldehyde and furfuryl alcohol into the reaction kettle, stir and mix, and adjust the pH value to 4.5-6 with acid;

[0038] (2) Add catalyst zinc acetate under the above-mentioned acidic conditions, carry out catalytic reaction at 130-150° C., and keep the temperature for 3-5 hours to obtain a polymer;

[0039] (3) Add aldehyde remover and coupling agent, stir and mix evenly;

[0040] (4) Adjust the pH value to neutrality with sodium hydroxide solution, continue to stir and discharge to obtain the product.

[0041] In parts by weight, the parts by weight of the raw materials in each of the above reaction stages are: 9 parts of solid formaldehyde, 100 parts of furfuryl alcohol, 0.5 parts of zinc acetate, 10 parts of aldehyde remover, and 0.8 parts of coupling agent.

[0042] The solid formaldehyde is paraformaldehyde with a low degree of polymerization, and the ...

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PUM

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Abstract

The invention discloses a preparation method of nitrogen-free furan resin, and belongs to the technical field of furan resin production. The method comprises the following steps: adding solid formaldehyde and furfuryl alcohol into a reaction kettle, performing stirring and mixing, and adjusting the pH value to 4.5-6 by using an acid; adding a catalyst zinc acetate under the acidic condition, performing a catalytic reaction at 130-150 DEG C, and maintaining the temperature for 3-5 h to obtain a polymer; adding an aldehyde removing agent and a coupling agent, and performing stirring for uniformmixing; and adjusting the obtained solution to be neutral by using a sodium hydroxide solution, performing continuous stirring, and discharging the obtained material to obtain the product. Raw materials in all above reaction stages comprise, by weight, 5-9 parts of solid formaldehyde, 95-100 parts of furfuryl alcohol, 0.2-0.5 part of zinc acetate, 6-10 parts of the aldehyde removing agent and 0.4-0.8 part of the coupling agent. The raw materials and the production process are improved to obtain the nitrogen-free furan resin having the advantages of no nitrogen, low free formaldehyde, low cost,energy saving, environmental protection and high strength nitrogen, and the nitrogen-free furan resin can be directly used for producing steel castings.

Description

technical field [0001] The invention relates to the technical field of furan resin production, in particular to a preparation method of nitrogen-free furan resin. Background technique [0002] Furan resin has been widely used in my country after nearly 30 years of promotion since the 1970s. However, nitrogen-containing furan resin is produced and applied more maturely in our country. It is mainly used in the production of steel castings. This is because it contains more nitrogen. Nitrogen can cause defects such as pores in steel castings. Therefore, nitrogen-containing furan resin is not suitable for the production of steel castings, especially large steel castings and alloy steel castings. With the increasing requirements for casting quality, low-nitrogen or nitrogen-free furan resin must be used. However, the production of nitrogen-free furan resin has always had the disadvantages of high viscosity, high free formaldehyde, and low tensile strength, so that in casting prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/02B22C1/22
Inventor 刘萌孙志勇孙笃新
Owner 山东永创材料科技有限公司
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