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Curing agent for inorganic phosphate binder precoated sand and application thereof

A technology of inorganic phosphate and binder, which is used in casting molding equipment, molds, cores, etc., can solve the problems of insufficient strength and poor fluidity, and achieve the effect of improving fluidity and good surface safety.

Active Publication Date: 2021-03-09
保定保蒙新型材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second object of the present invention is to provide an application of a curing agent for inorganic phosphate binder coated sand in the preparation of foundry sand molds, so as to solve the problems of poor fluidity of the current phosphate wet sand and insufficient strength after curing. The scheme adopted by one of the purposes is: a kind of curing agent for inorganic phosphate binder coated sand, the following components:

Method used

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  • Curing agent for inorganic phosphate binder precoated sand and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Weigh 1000g of standard sand, 2g of silane coupling agent, and set aside;

[0044] 2. Add the standard sand and silane coupling agent into the mixer and stir for 90 seconds;

[0045] 3. Weigh and mix 25g of phosphate binder, 2g of citric acid aqueous solution with a mass ratio of 1:2, and 25g of aluminum sulfate octadecahydrate, and then add it to the sand prepared in step 2 and continue sand mixing for 120s;

[0046] 4. Put the wet sand prepared in step 3 in a hot air mixer, and feed hot air at 40°C while stirring. When the sand particles in the mixer are evenly dispersed and there is no obvious agglomeration, dry coated sand is prepared and passed through sieving. Afterwards, keep it airtight for later use;

[0047] 5. Add 30g of PVP-coated magnesia powder to the above dry coated sand and mix the sand for 30 seconds,

[0048] 6. Use the core shooter to shoot the sand, the mold temperature is 130°C, the mold heating time is 3min, and the mold is solidified and for...

Embodiment 2

[0051] 1. Weigh 1000g of standard sand, 2g of silane coupling agent, and set aside;

[0052]2. Add the standard sand and silane coupling agent into the mixer and stir for 90 seconds;

[0053] 3. Weigh and mix 30g of phosphate binder, 4g of citric acid aqueous solution with a mass ratio of 1:2, and 30g of aluminum sulfate octadecahydrate, and then add it to the sand prepared in step 2 and continue sand mixing for 120s;

[0054] 4. Put the wet sand prepared in step 3 in a hot air mixer, and feed hot air at 45°C while stirring. When the sand particles in the mixer are evenly dispersed and there is no obvious agglomeration, dry coated sand is prepared and passed through sieving. Afterwards, keep it airtight for later use;

[0055] 5. Add 40g of PVP-coated magnesia powder to the above-mentioned dry coated sand, mix the sand for 30 seconds, and use a core shooter to shoot the sand. The mold temperature is 150°C, and the mold heating time is 2 minutes to solidify and form;

[0056]...

Embodiment 3

[0058] 1. Weigh 1000g of standard sand, 4g of silane coupling agent, and set aside;

[0059] 2. Add the standard sand and silane coupling agent into the mixer and stir for 90 seconds;

[0060] 3. Weigh and mix 35g of phosphate binder, 6g of citric acid aqueous solution with a mass ratio of 1:2, and 30g of aluminum sulfate octadecahydrate, and then add it to the sand prepared in step 2 and continue sand mixing for 120s;

[0061] 4. Put the wet sand prepared in step 3 in a hot air mixer, and feed hot air at 45°C while stirring. When the sand particles in the mixer are evenly dispersed and there is no obvious agglomeration, dry coated sand is prepared and passed through sieving. Afterwards, keep it airtight for later use;

[0062] 5. Add 50g of PVP-coated magnesia powder to the above-mentioned dry coated sand, mix the sand for 30 seconds, and use a core shooter to shoot the sand. The mold temperature is 150°C, and the mold heating time is 2 minutes to solidify and form;

[0063...

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Abstract

The invention discloses a curing agent for inorganic phosphate binder precoated sand. The curing agent for the inorganic phosphate binder precoated sand comprises the following components: 2 to 6 parts of coupling agent; 25 to 40 parts of a phosphate binder; 2 to 6 parts of an organic weak acid aqueous solution; 25 to 30 parts of crystalline hydrate; and 30 to 50 parts of PVP coated magnesia powder. According to the curing agent for the inorganic phosphate binder precoated sand provided by the invention, the inorganic phosphate binder and the crystalline hydrate are attached to the surfaces ofsand grains, hot air is introduced to enable the binder to be dried, the crystalline hydrate is wrapped in the binder, dry precoated sand is obtained, and the dry precoated sand has excellent flowability; and after sand shooting, the hydrate is decomposed into water molecules through mold heating so as to wet the binder, and the wetting binder and the sand grains are bonded and formed with each other and then rapidly cured to form strength.

Description

technical field [0001] The invention relates to the technical field of phosphate binder sand casting, in particular to a curing agent for inorganic phosphate binder coated sand and an application thereof. Background technique [0002] With the increasingly stringent environmental protection supervision and the awakening of people's awareness of environmental protection, the environmental pollution caused by traditional organic resin coated sand cannot be ignored. The problem is not ideal in practical application. It is imminent to seek a new type of inorganic binder that can replace traditional organic resin sand. [0003] Phosphate binder is a green casting binder with low curing temperature, good heat resistance, small gas generation, good high temperature collapsibility, good reusability, simple process and low cost. It is a very Modeling materials with application value and application prospect. At present, the curing methods of phosphate binder sand mainly include he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/18B22C9/02
CPCB22C1/185B22C9/02
Inventor 张友寿唐文卓夏露夏增权
Owner 保定保蒙新型材料科技有限公司
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