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Fast-curing type high-temperature resistant binder and pre-coated sand thereof

A binder and high-temperature-resistant technology, applied in the field of materials, can solve the problems of high cost of refractory particles and environmental pollution, and achieve high strength, simple and easy preparation method, and low production cost

Active Publication Date: 2015-05-06
通辽市仁创铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the method of adding particles, so that the physical blending of particles and coated sand can give it a certain high temperature resistance to a certain extent, but the cost of refractory particles is high, and the powder will cause certain environmental pollution, so this kind of technology The solution is not feasible

Method used

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  • Fast-curing type high-temperature resistant binder and pre-coated sand thereof
  • Fast-curing type high-temperature resistant binder and pre-coated sand thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation of embodiment 1 molybdenum modified high ortho phenolic resin

[0045] (1) Put formaldehyde and phenol into the reactor in a molar ratio of 0.7:1, add a catalyst equivalent to 0.6% of the total mass of phenol at the same time, heat and stir to reflux at 100° C. for 3 hours;

[0046] (2) Cool down to 90°C and add a molybdenum modifier equivalent to 1.5% of the phenol mass, and keep stirring for 40 minutes;

[0047] (3) heating up to 100°C, adding oxalic acid and stirring for 1.2 hours;

[0048] (4) Atmospheric distillation to 130° C. was changed to a vacuum distillation device for vacuum distillation to 180° C. and rapid discharging and cooling to obtain molybdenum-modified high-ortho-position phenolic resin.

[0049]Among them, the catalyst is zinc oxide and zinc acetate with a mass ratio of 1:2, the molybdenum modifier is molybdenum acid, and the amount of oxalic acid is 0.3% of the mass of phenol.

[0050] The infrared analysis diagram of molybdenum ...

Embodiment 2

[0051] The preparation of embodiment 2 molybdenum modified high ortho phenolic resin

[0052] (1) Put formaldehyde and phenol into the reactor in a molar ratio of 0.6:1, add a catalyst equivalent to 0.2% of the total mass of phenol at the same time, heat and stir to 100° C. and reflux for 2.5 hours;

[0053] (2) cooling down to 90 DEG C and adding a molybdenum modifier equivalent to 0.5% of the phenol mass, and insulated and stirred for 30 minutes;

[0054] (3) heating up to 100°C, adding oxalic acid and stirring for 1 hour;

[0055] (4) Atmospheric distillation to 130° C. was changed to a vacuum distillation device for vacuum distillation to 180° C. and rapid discharging and cooling to obtain molybdenum-modified high-ortho-position phenolic resin.

[0056] Among them, the catalyst is zinc oxide and zinc acetate with a mass ratio of 1:2, the molybdenum modifier is molybdenum acid, and the amount of oxalic acid is 0.3% of the mass of phenol.

[0057] The infrared analysis dia...

Embodiment 3

[0058] The preparation of embodiment 3 molybdenum modified high ortho phenolic resin

[0059] (1) Put formaldehyde and phenol into the reactor in a molar ratio of 0.8:1, add a catalyst equivalent to 0.8% of the total mass of phenol at the same time, heat and stir to reflux at 100° C. for 3 hours;

[0060] (2) Cool down to 90°C and add a molybdenum modifier equivalent to 2% of the phenol mass, and keep stirring for 35 minutes;

[0061] (3) heating up to 100°C, adding oxalic acid and stirring for 1 hour;

[0062] (4) Atmospheric distillation to 130° C. was changed to a vacuum distillation device for vacuum distillation to 180° C. and rapid discharging and cooling to obtain molybdenum-modified high-ortho-position phenolic resin.

[0063] Among them, the catalyst is zinc oxide and zinc acetate with a mass ratio of 1:2, and the molybdenum modifier is molybdenum oxalic acid, and the amount of oxalic acid is 0.3% of the mass of phenol.

[0064] The infrared analysis diagram of moly...

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Abstract

The invention discloses a fast-curing type high-temperature resistant binder. The binder is molybdenum modified high o-phenolic resin, and the binder has a structure shown in the specification). The invention further discloses a pre-coated sand in which the molybdenum modified high o-phenolic resin is used as binder; with specially selected dehydrating agent, curing agent and lubricating agent, with optimized dosage, without adding functional auxiliaries like fire-resistant particles and accelerant, the curing speed of the pre-coated sand can be improved significantly, furthermore, the high-strength high-temperature bending strength of the fast-curing type high-temperature resistant pre-coated sand is equal to or greater than 6.0MPa, the normal-temperature tensile strength is 3.0MPa, the heat bending strength is equal to or greater than 3.0Mpa, the low tolerance is equal to or less than 18mL / g, and the radiating property is improved significantly. When the preparation method disclosed by the invention is utilized, the effect is more significant, i.e., the novel pre-coated sand with completely improved combination property is obtained by the improvement of the pre-coated sand raw materials and the method.

Description

technical field [0001] The invention relates to the field of materials and provides a novel binder, coated sand containing the binder and a preparation method thereof. Background technique [0002] At present, fast-curing coated sand mostly adopts the method of adding accelerators to make the coated sand quickly solidify. These accelerators include benzoic acid, salicylic acid, salicylic alcohol, hydroxyphenylacetic acid, EPG-217 / 2-methylimidazole Although one or more of these coated sands in etc. achieve the purpose of rapid solidification, the cost of input is relatively large. [0003] In addition, the existing high-temperature-resistant coated sand mostly uses one or more kinds of refractory granular clay, quartz powder, graphite powder, magnesia powder, zircon powder, etc. Adding the method of adding particles, so that the physical blending of particles and coated sand can give it a certain high temperature resistance to a certain extent, but the cost of refractory par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
CPCB22C1/22
Inventor 秦升益胡炜王宏斌龙御云
Owner 通辽市仁创铸造材料有限公司
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