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Polyester polyol and phenolic resin composite cold box core-making binder system

A polyester polyol, phenolic resin technology, applied in the direction of cores, casting molds, manufacturing tools, etc., can solve the problem of low instant strength, and achieve the effect of high later strength and improved instant strength

Inactive Publication Date: 2018-07-13
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still uses some phenylene ether type phenolic resins, which contain lower free aldehydes and free phenols, but the immediate strength and later strength are lower than those of traditional phenylene ether type phenolic resin cold box resins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The resin is a binder system mixed with components I and II. The polyester polyol used is an aromatic polyester polyol synthesized from 1,2-propanediol and phthalic anhydride under the condition that the raw material alkyd molar ratio is 1.25:1, and the hydroxyl value is about 100mgKOH / g. Component I contains 35% polyester polyol, 40% mixed solvent and 25% phenylene ether type phenolic resin, wherein the mixed solvent consists of 45% DBE, 51.5% 100# solvent oil, 2% oleic acid and 0.5% HF and 1% KH560; Component II contains 75% polyisocyanate MR-200 and 25% 100# solvent oil. The amount of sand used is 200g, the optimal mass ratio of component I and component II is 1:2, the total amount of resin accounts for 1.5% of the sand, and the triethylamine generator is used to blow amine for curing, blowing amine for 4s, blowing amine amount to 4mL. After blowing and curing, the immediate tensile strength, 1min strength and 24h strength are 0.79Mpa, 1.4Mpa and 0.76Mpa respective...

Embodiment 2

[0056] The resin is a binder system mixed with components I and II. The polyester polyol used is an aromatic polyester polyol synthesized from 1,2-propanediol and phthalic anhydride under the condition that the raw material alkyd molar ratio is 1.25:1, and the hydroxyl value is about 100mgKOH / g. Component I contains 40% polyester polyol, 40% mixed solvent and 20% phenolic resin, wherein the mixed solvent consists of 45% DBE, 51.5% 100# solvent oil, 2% oleic acid, 0.5% HF and 1% KH560 ; Component II contains 75% polyisocyanate MR-200 and 25% 100# solvent naphtha. The amount of sand used is 200g, the optimal mass ratio of component I and component II is 1:2, the total amount of resin accounts for 1.5% of the sand, and the triethylamine generator is used to blow amine for curing, blowing amine for 4s, blowing amine amount is 5mL. After air blowing and solidification, the immediate tensile strength, 1min strength and 24h strength of the resin sand are 0.95Mpa, 1.25Mpa and 0.75Mp...

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PUM

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Abstract

The invention discloses a polyester polyol and phenolic resin compound type cold box core-making binder system, including component I and component II; the component I, in terms of mass percentage, contains 20% of polyester polyol- 60%, 10%-30% of phenylene ether type phenolic resin, and the balance is anti-moisture agent and solvent I; the components include polyisocyanate, retarder and solvent II. It greatly reduces the waste water with high free aldehydes and free phenols in the production of existing cold box resins and the environmental pollution caused by free aldehydes and free phenols in the application of cold box resins.

Description

technical field [0001] The invention relates to a novel cold box casting binder system catalyzed by vaporized organic tertiary amine, in particular to a composite cold box core-making binder system of polyester polyol and phenolic resin. Background technique [0002] The cold box core making (type) process is a new type of core making process developed in the 1960s. It used to refer to the ISOCURE method of the Ashland Company in the United States. A resin sand process in which the binder hardens at room temperature with a gas catalyst. In this type of method, firstly, the binder component is mixed uniformly with sand, and then the sand mixed with the binder is shot into the desired mold through a core shooter. The mold-filled sand is solidified at room temperature with the aid of a vaporized catalyst to produce the desired core / mold with sufficiently high strength. Most cold box coremaking refers to gaseous organic amine-cured polyurethane binder systems, such as US340957...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/20B22C1/02
CPCB22C1/02B22C1/20
Inventor 黄仁和张宝平
Owner SHANDONG UNIV OF SCI & TECH
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