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A kind of organic furfuryl alcohol modified amino resin-inorganic sol composite coating for casting filter screen, preparation method and application

An amino resin, inorganic sol technology, applied in textiles and papermaking, etc., can solve the problems of inability to meet the requirements of high temperature use of filters, methanol pollution of the workshop environment, poor heat resistance, etc. Low smoke and good heat resistance

Active Publication Date: 2021-09-03
SHANDONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Cast filter screen coating material is mainly thermoplastic phenolic resin alcohol solution at present, and they all have higher heat resistance and higher carbon residual rate, but inventor finds: release free formaldehyde, free phenol and Ammonia and a large amount of solvent methanol pollute the workshop environment, and the cost is high
However, the current low-toxic resins have poor heat resistance and cannot meet the requirements of high-temperature use of the filter. For example, the heat-resistant temperature of melamine-formaldehyde resin is generally only about 130-150°C

Method used

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  • A kind of organic furfuryl alcohol modified amino resin-inorganic sol composite coating for casting filter screen, preparation method and application
  • A kind of organic furfuryl alcohol modified amino resin-inorganic sol composite coating for casting filter screen, preparation method and application
  • A kind of organic furfuryl alcohol modified amino resin-inorganic sol composite coating for casting filter screen, preparation method and application

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preparation example Construction

[0043] The present invention also provides a kind of preparation method of the organic furfuryl alcohol modified amino resin-inorganic sol composition that is used for casting filter screen, comprising:

[0044] Mix appropriate amount of water or furfuryl alcohol or low-condensation furfuryl alcohol with sol or solid sol, then add furfuryl alcohol modified amino resin or amino resin and mix evenly, then add appropriate amount of additives or other auxiliary materials and mix evenly.

[0045] The present invention also provides a method for preparing an organic furfuryl alcohol-modified amino resin-inorganic sol composite coating for a filter screen for casting, wherein alkali-free glass fibers or high-silica glass fibers are impregnated in the above-mentioned composition, Finally, after solidification or / and carbonization, an organic-inorganic coating is formed on the glass fiber cloth to obtain a filter net for casting.

[0046] Coating material preparation: water or furfuryl...

Embodiment 1

[0053] (1) Synthesis of low free aldehyde melamine formaldehyde resin: Add 90 grams of water and 55.3 grams of paraformaldehyde to the there-necked bottle, heat up to 80°C to dissolve, add 63 grams of melamine, react at 80°C for 0.5 hours, pH is 8 to 9, add 120 grams of methanol, adjust the pH to 5 to 6, the temperature is 50 ° C, keep the reaction for 0.5 hours, and adjust the pH to 8-9 with liquid caustic soda.

[0054] (2) Organic-inorganic coating composition:

[0055] Wherein, low free aldehyde melamine formaldehyde resin: 30g (solid content about 35%);

[0056] Furfuryl alcohol: 35g

[0057] The curing agent is maleic anhydride: 2g

[0058] Alkaline silica sol (40%): 33g

[0059] (3) The organic-inorganic composite coating material is cured and carbonized at 150°C and 300°C for a certain period of time, and the carbonization rate and thermogravimetric curve of the carbide are measured;

[0060] (4) Dip coating in the above-mentioned coating material with alkali-free ...

Embodiment 2

[0062] (1) Synthesis of furfuryl alcohol modified melamine formaldehyde resin: Add 150g of 37% liquid formaldehyde and 50g of furfuryl alcohol into a three-necked flask with a condenser and a stirring device, start stirring, adjust the pH to 8.5-9 with liquid alkali, and then add 63g of melamine , raise the temperature to 70°C, after the melamine is dissolved, react for another 20 minutes, cool down to about 65°C, add 55g of methanol and 80g of furfuryl alcohol, adjust the pH to 5.0-5.5 with dilute hydrochloric acid, and finally keep the reaction at 90°C for about 30 minutes, and discharge;

[0063] (2) Organic-inorganic coating composition:

[0064] Wherein, furfuryl alcohol modified melamine formaldehyde resin: 200g;

[0065] The curing agent is maleic anhydride: 10g;

[0066] water: 20;

[0067] Aluminum sol powder: 52g;

[0068] (3) The organic-inorganic composite coating material is cured and carbonized at 150°C and 300°C for a certain period of time, and the carboniza...

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Abstract

The invention provides a method for preparing an organic resin-inorganic sol composite coating used for a filter screen for casting. Use furfuryl alcohol modified amino resin or furfuryl alcohol and low free aldehyde etherified melamine-formaldehyde resin or water-based urea-formaldehyde resin as the organic resin binder component, and use inorganic sol, silica sol, aluminum sol, etc. and pseudoboehmite as peptizers An organic-inorganic coating material compounded with an inorganic adhesive is used as the patented coating material to prepare filters for cast aluminum, cast copper and cast iron. Compared with the currently used alcohol solution thermoplastic phenolic solution as the coating material, the filter screen coating material has low toxicity and low cost, and the strength and heat resistance of the filter screen casted by alloys or metals with lower melting points can fully meet the requirements of pouring filtration. Requirements.

Description

technical field [0001] The invention belongs to the technical field of preparation of organic furfuryl alcohol-modified amino resin-inorganic sol composite coating, and in particular relates to an organic resin-inorganic sol composite coating for casting filter nets, a preparation method and application. Background technique [0002] Casting filter screen is used under high temperature conditions to filter the molten slag caused by various impurities, slag removers and various non-metallic substances in liquid metals such as iron, steel, aluminum and so on. Obtain high-quality castings and reduce the rejection rate of castings. At present, the filter screen for casting is obtained by impregnating high-silica glass fiber cloth with the alcohol solution of thermoplastic phenolic resin, and then curing at low temperature or carbonizing at high temperature. It is widely used in the foundry industry, but the heat resistance of thermoplastic phenolic resin , burning resistance, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/00D06N3/12
Inventor 黄仁和陈登宁袁振飞唐尧基李廷树
Owner SHANDONG UNIV OF SCI & TECH
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