CN104893621A - Adhesive for casting core mold and preparation method of adhesive - Google Patents

Abstract

The invention discloses an adhesive for a casting core mold. Lactic acid/glycerol organic zirconium is taken as a crosslinking agent and has a remarkable thermo-sensitive crosslinking characteristic; an ethylene-ethyl acrylate polymer fiber base solution is taken as a thickening agent, gel with good temperature resistance and anti-shearing performance can be formed under the crosslinking function, the polymer base solution processed through fiber is adopted, the surface activity of a polymer can be improved, the crosslinking effect is promoted, and the viscoelasticity and the thixotropy are improved.

Description

A kind of casting core Mold binder and preparation method thereof

Technical field

The present invention relates to a kind of tackiness agent, particularly relate to a kind of casting core Mold binder and preparation method thereof.

Background technology

Traditional vegetable jelly tackiness agent, at high temperature facile hydrolysis, poor to the protectiveness of base material, and the thickening capabilities of ethylene-ethyl acrylate copolymer is strong, heat resistance is good;

The most frequently used linking agent of usual acquisition polymer gel is organic boron or organic zirconium, and organic borate cross-linker heatproof is the highest can only reach 150 DEG C, and organic zirconium can be cross-linked in acid condition, and heatproof is high, can reach 200 DEG C, has broad application prospects.

Summary of the invention

Object of the present invention is just to provide a kind of casting core Mold binder and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of casting core Mold binder, it is made up of the raw material of following weight parts:

Exsiccated ammonium alum 0.8-1, Magnesium Stearate 3-4, resol 17-20, the salpeter solution 0.3-0.4 of glycerin fatty acid ester 3-5, sp-80 0.8-2,10-12mol/l, ethylene-ethyl acrylate copolymer 200-210, zirconium oxychloride 1.3-2, lactic acid 0.5-1, glycerol 0.6-1, sisal fibers 10-15, polyurethane(s) 4-6, tetrahydrofurfuryl alcohol 0.1-0.2, polyacrylamide 2.4-3, maleic anhydride inoculated polypropylene 10-16.

2, a preparation method for casting core Mold binder as claimed in claim 1, is characterized in that comprising the following steps:

(1) joined by exsiccated ammonium alum in 35-40 times of water, heated and stirred is dissolved, and adds the 10-20% of Magnesium Stearate, above-mentioned sp-80 weight, stirs, obtain emulsion; ,

(2) joined by polyacrylamide in 100-120 times of water, stirring and dissolving, adds tetrahydrofurfuryl alcohol, and raised temperature is 60-65 DEG C, adds remaining sp-80, ethylene-ethyl acrylate copolymer, insulated and stirred 10-20 minute, obtains polymer emulsion;

(3) sisal fibers being joined concentration is infiltrate 3-4 hour in the bisulfite potassium solution of 5-7%, take out post-drying abrasive dust, add above-mentioned emulsion, drip the salpeter solution of 10-12mol/l, be heated to boiling, add polymer emulsion, and regulate PH to be 6-6.5, be stirred to normal temperature, obtain polymer fiber base fluid;

(4) joined by zirconium oxychloride in 2-3 times of water, stirring and dissolving, adds lactic acid, glycerol, and regulation system pH value, to 4-5, is uniformly mixed 4-5 hour, obtains organic zirconium crosslinker;

(5) by above-mentioned polymer fiber base fluid, organic zirconium crosslinker mixing, in the constant temperature oil bath of 80-90 DEG C, stir 20-30 minute, add polyurethane(s), stir, obtain organic zirconium gel;

(6) by above-mentioned maleic anhydride inoculated polypropylene, glycerin fatty acid ester mixing, heat-insulation preheating 10-15 minute at 80-90 DEG C, mixes with organic zirconium gel, raised temperature is 110-130 DEG C, insulated and stirred 30-40 minute, add each raw material of residue, raised temperature is 170-180 DEG C, insulated and stirred 2-3 hour, through tank cooling, cut off shaping, dehydration, vacuum-drying, to obtain final product.

Advantage of the present invention is:

The present invention with lactic acid/glycerol organic zirconium for linking agent, it has obvious temperature sensitive crosslinking feature, with ethylene-ethyl acrylate copolymer fiber base fluid for viscosifying agent, pass through crosslinked action, the gel with good temperature and shearing sustainability can be formed, adopt the multipolymer base fluid of fiber treatment, multipolymer surfactivity can be improved, promote cross-linking effect, improve visco-elasticity and thixotropy.

Tackiness agent good weatherability of the present invention, intensity is high, good toughness, for the manufacture of the core mould of casting metal foundry goods, casting resin sand intensity can be made to significantly improve, and using method is simple, directly joins in casting aggregate after heating and melting.

Embodiment

Below in conjunction with embodiment, the present invention is described in further detail:

Embodiment 1:

A kind of casting core Mold binder, it is made up of the raw material of following weight parts:

The salpeter solution 0.4 of exsiccated ammonium alum 0.8, Magnesium Stearate 4, resol 20, glycerin fatty acid ester 5, sp-80 0.8,12mol/l, ethylene-ethyl acrylate copolymer 210, zirconium oxychloride 1.3, lactic acid 0.5, glycerol 0.6, sisal fibers 15, polyurethane(s) 6, tetrahydrofurfuryl alcohol 0.2, polyacrylamide 2.4, maleic anhydride inoculated polypropylene 16.

A preparation method for casting core Mold binder, comprises the following steps:

(1) exsiccated ammonium alum is joined in 40 times of water, heated and stirred dissolve, add Magnesium Stearate, above-mentioned sp-80 weight 10%, stir, obtain emulsion; ,

(2) joined by polyacrylamide in 120 times of water, stirring and dissolving, adds tetrahydrofurfuryl alcohol, and raised temperature is 65 DEG C, adds remaining sp-80, ethylene-ethyl acrylate copolymer, insulated and stirred 10-20 minute, obtains polymer emulsion;

(3) sisal fibers being joined concentration is infiltrate 4 hours in the bisulfite potassium solution of 5%, takes out post-drying abrasive dust, adds above-mentioned emulsion, drip the salpeter solution of 12mol/l, be heated to boiling, add polymer emulsion, and regulate PH to be 6.5, be stirred to normal temperature, obtain polymer fiber base fluid;

(4) joined by zirconium oxychloride in 3 times of water, stirring and dissolving, adds lactic acid, glycerol, and regulation system pH value to 5 is uniformly mixed 4 hours, obtains organic zirconium crosslinker;

(5) by above-mentioned polymer fiber base fluid, organic zirconium crosslinker mixing, stir 20 minutes in the constant temperature oil bath of 90 DEG C, add polyurethane(s), stir, obtain organic zirconium gel;

(6) by above-mentioned maleic anhydride inoculated polypropylene, glycerin fatty acid ester mixing, at 90 DEG C, heat-insulation preheating 15 minutes, mixes with organic zirconium gel, raised temperature is 130 DEG C, insulated and stirred 40 minutes, add each raw material of residue, raised temperature is 180 DEG C, insulated and stirred 2 hours, through tank cooling, cut off shaping, dehydration, vacuum-drying, to obtain final product.

Performance test:

Cohesive strength: 3.9MPa;

Viscosity: 3400mPa.s.

Claims (2)

1. a casting core Mold binder, is characterized in that what it was made up of the raw material of following weight parts:

Exsiccated ammonium alum 0.8-1, Magnesium Stearate 3-4, resol 17-20, the salpeter solution 0.3-0.4 of glycerin fatty acid ester 3-5, sp-80 0.8-2,10-12mol/l, ethylene-ethyl acrylate copolymer 200-210, zirconium oxychloride 1.3-2, lactic acid 0.5-1, glycerol 0.6-1, sisal fibers 10-15, polyurethane(s) 4-6, tetrahydrofurfuryl alcohol 0.1-0.2, polyacrylamide 2.4-3, maleic anhydride inoculated polypropylene 10-16.

2. a preparation method for casting core Mold binder as claimed in claim 1, is characterized in that comprising the following steps:

(1) joined by exsiccated ammonium alum in 35-40 times of water, heated and stirred is dissolved, and adds the 10-20% of Magnesium Stearate, above-mentioned sp-80 weight, stirs, obtain emulsion; ,

(2) joined by polyacrylamide in 100-120 times of water, stirring and dissolving, adds tetrahydrofurfuryl alcohol, and raised temperature is 60-65 DEG C, adds remaining sp-80, ethylene-ethyl acrylate copolymer, insulated and stirred 10-20 minute, obtains polymer emulsion;

(3) sisal fibers being joined concentration is infiltrate 3-4 hour in the bisulfite potassium solution of 5-7%, take out post-drying abrasive dust, add above-mentioned emulsion, drip the salpeter solution of 10-12mol/l, be heated to boiling, add polymer emulsion, and regulate PH to be 6-6.5, be stirred to normal temperature, obtain polymer fiber base fluid;

(4) joined by zirconium oxychloride in 2-3 times of water, stirring and dissolving, adds lactic acid, glycerol, and regulation system pH value, to 4-5, is uniformly mixed 4-5 hour, obtains organic zirconium crosslinker;

(5) by above-mentioned polymer fiber base fluid, organic zirconium crosslinker mixing, in the constant temperature oil bath of 80-90 DEG C, stir 20-30 minute, add polyurethane(s), stir, obtain organic zirconium gel;

(6) by above-mentioned maleic anhydride inoculated polypropylene, glycerin fatty acid ester mixing, heat-insulation preheating 10-15 minute at 80-90 DEG C, mixes with organic zirconium gel, raised temperature is 110-130 DEG C, insulated and stirred 30-40 minute, add each raw material of residue, raised temperature is 170-180 DEG C, insulated and stirred 2-3 hour, through tank cooling, cut off shaping, dehydration, vacuum-drying, to obtain final product.