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Hydroxyl-terminated alkaline phenolic resin and preparation thereof

A technology of phenolic resin and terminal hydroxyl group, which is applied in the field of preparation of organic polymer binders for foundry, and can solve problems such as limitations, difficulty in sand mixing, and short usable time

Inactive Publication Date: 2009-01-21
LIAONING FU-AN HEAVY INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the production of large steel castings, there are the following disadvantages: fast curing speed, short service life, high resin viscosity (150mPa.s / 25°C), relatively difficult sand mixing
The use of basic phenolic resins is limited to a certain extent

Method used

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  • Hydroxyl-terminated alkaline phenolic resin and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 200 grams of phenol into the reaction kettle, raise the temperature to 90°C, slowly add 200 grams of potassium hydroxide solution (50%), and 350 grams of 37% formaldehyde solution, and complete the addition in two hours.

[0029] Then add 30 grams of modifier ethylene glycol, keep warm at 90°C for 30 minutes, then cool down to 80°C, check the viscosity every 30 minutes, when the viscosity reaches 60-80mpa.S / 25°C, cool down below 40°C and add Combined agent γ-aminopropyltriethoxysilane 4 grams, after stirring evenly, discharge.

Embodiment 2

[0031] Add 210 grams of phenol into the reaction kettle, raise the temperature to 90° C., slowly add 300 grams of potassium hydroxide solution (50%), and 300 grams of 37% formaldehyde solution, and finish adding in two hours.

[0032] Add 10 grams of modifier glycerol, keep warm at 90°C for 40 minutes, then cool down to 80°C, check the viscosity every 30 minutes, when the viscosity reaches 60-80mpa.S / 25°C, drop the temperature below 40°C and add coupling Agent γ-glycidyl ether oxypropyl trimethoxysilane 5 grams, after stirring evenly, discharge.

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Abstract

The invention relates to a preparation method for an organic macromolecular binder for casting, in particular to a hydroxy terminated alkaline phenolic resin as a binder of resin sand for large-sized castings and a preparation method thereof. The hydroxy terminated alkaline phenolic resin is prepared by phenolic compounds, aldehyde compounds, modifiers, solution of a catalyst, and a coupling agent according to proper weight proportion. The hydroxy terminated alkaline phenolic resin adopts polyols as modifiers and a hydroxy for macromolecular termination. The product can remarkably improve the activity of cure reaction of the phenolic resin, the strength of the resin and the service performance of the resin. Therefore, the organic macromolecular binder is suitable for preparing an organic curing alkaline phenolic resin.

Description

technical field [0001] The invention relates to a method for preparing an organic polymer binder for casting, which is used as a resin sand binder and is suitable for large castings. Background technique [0002] Ester-hardened alkaline phenolic resin no-bake sand is an advanced molding process, which mixes raw sand, alkaline phenolic resin, and organic ester curing agent evenly before molding. Because it does not contain N, S, P and other elements. Therefore, it has the characteristics of good casting quality and low environmental pollution. However, at present, alkaline phenolic resin is mainly used in the production of small cast steel parts. For the production of large steel castings, it has the following disadvantages: fast curing speed, short service life, high resin viscosity (150mPa.s / 25°C), and relatively difficult sand mixing. The use of basic phenolic resins is limited to a certain extent. Contents of the invention [0003] The object of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C09J161/14B22C1/22
Inventor 雷士文张洪生吴青田
Owner LIAONING FU-AN HEAVY INDUSTRY CO LTD
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