Self-reinforced phenolic resin quick-curing precoated sand and preparation method thereof

A technology of phenolic resin and coated sand, which is used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of high curing temperature, unfavorable environment, and excessively brittle materials, achieve low curing temperature, improve curing speed, The effect of reducing the curing temperature

Active Publication Date: 2015-04-22
应城市力发化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in curing thermoplastic phenolic resin with hexamethylenetetramine: (1) The curing temperature is too high, requir

Method used

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  • Self-reinforced phenolic resin quick-curing precoated sand and preparation method thereof
  • Self-reinforced phenolic resin quick-curing precoated sand and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0023] Example 1

[0024] The aqueous solution containing 37% formaldehyde and phenol are dropped into the reactor 1 according to mol ratio 1:1.1 and fully mixed; then in the reactor 1, add the oxalic acid that accounts for 3% by weight of phenol as a catalyst, and add the γ- Aminopropyltriethoxysilane was used as a silane coupling agent, and the pH of the solution was controlled to be 2.1 to form a mixed solution; the above mixed solution was heated to 60 °C in a water bath and refluxed for 1 hour; is 2kg / min, and the temperature of the solution is controlled to be 80°C, until the molecular weight distribution index of the solution detected by gel permeation chromatography is D=M(w) / M(n) is 1.5, and the dropwise addition of formaldehyde is stopped; finally, the solution is dehydrated under reduced pressure, And remove the unreacted phenol, control the dehydration temperature to 188 ℃, and then the desired thermoplastic phenolic resin can be obtained.

[0025] Phenol, contain...

Example Embodiment

[0027] Example 2

[0028] The aqueous solution containing 37% formaldehyde and phenol are dropped into the reactor 1 according to mol ratio 1:1.1 and fully mixed; then in the reactor 1, add the oxalic acid that accounts for 3% by weight of phenol as a catalyst, and add the γ- Aminopropyltriethoxysilane was used as a silane coupling agent, and the pH of the solution was controlled to be 2.1. The obtained solution was heated to 60 °C in a water bath and refluxed for 1 hour to form a mixed solution; then formaldehyde was added dropwise to the mixed solution at a uniform rate, and the rate of addition was is 2kg / min, the temperature of the control solution is 85°C, until the molecular weight distribution index of the solution detected by gel permeation chromatography is D=M(w) / M(n) is 1.6, the dropwise addition of formaldehyde is stopped; finally, the solution is dehydrated under reduced pressure, And remove the unreacted phenol, control the dehydration temperature to 188 ℃, and t...

Example Embodiment

[0031] Example 3

[0032] The aqueous solution containing 37% formaldehyde and phenol are dropped into the reactor 1 according to mol ratio 1:1.2 and fully mixed; Then in the reactor 1, add the oxalic acid that accounts for 4% by weight of phenol as a catalyst, and add the γ- Aminopropyltriethoxysilane was used as a silane coupling agent, and the pH of the solution was controlled to be 2.1. The obtained solution was heated to 65°C in a water bath and refluxed for 1.5 hours to form a mixed solution; then formaldehyde was added dropwise to the mixed solution at a uniform rate, and the rate of addition was is 2kg / min, the control solution temperature is 85 ℃, until the molecular weight distribution index of the solution detected by gel permeation chromatography is D=M(w) / M(n) is 1.7, stop dripping formaldehyde; finally the solution is decompressed and dehydrated, And remove the unreacted phenol, control the dehydration temperature to 188 ℃, and then the desired thermoplastic phen...

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Abstract

The invention discloses self-reinforced phenolic resin quick-curing precoated sand and a preparation method thereof. The self-reinforced phenolic resin quick-curing precoated sand has the advantages that amine modified thermalsetting phenolic resin is adopted as a curing agent of narrow-distribution low-softening-point quick-curing thermoplastic phenolic resin precoated sand, a curing temperature is low, curing rate is high, maximum temperature is 188 DEG C only, and the curing time is 87s only; urotropine is not needed to be added as the curing agent in a preparation process, no byproduct or harmful gas is produced, and no harm is done to the environment; and aliphatic polyamine is adopted as an amine modifier during curing, so that toughness of the precoated sand obtained after curing is greatly improved, and bending strength can reach up to 7.8MPa.

Description

technical field [0001] The invention relates to a foundry sand and a preparation method thereof, in particular to a self-reinforced phenolic resin fast-curing coated sand and a preparation method thereof. technical background [0002] An important use of thermoplastic phenolic resins is the preparation of coated sands in the metal casting industry. Thermoplastic phenolic resin is the matrix material of coated sand, and its oligomer and cured properties have an important influence on the properties of coated sand. The type and quantity of curing agent determine the properties of phenolic resin after curing. At present, the main curing agent of thermoplastic phenolic resin is urotropine (hexamethylenetetramine), abbreviated as HMTA. The curing mechanism of urotropine is generally considered to be that when the resin is melted, there are unreacted active points on its benzene ring. At this time, urotropine is decomposed and the two phenolic rings are connected by a methine br...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/22C08G8/10C08G8/28
CPCB22C1/02C08G8/10C08G8/28
Inventor 李末银陈亮王长军
Owner 应城市力发化工有限责任公司
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