CN104226888B - A kind of easy defeated and dispersed precoated sand and preparation method thereof - Google Patents

A kind of easy defeated and dispersed precoated sand and preparation method thereof Download PDF

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Publication number
CN104226888B
CN104226888B CN201410430800.7A CN201410430800A CN104226888B CN 104226888 B CN104226888 B CN 104226888B CN 201410430800 A CN201410430800 A CN 201410430800A CN 104226888 B CN104226888 B CN 104226888B
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sand
parts
weight
binding agent
firming agent
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CN104226888A (en
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浦巧生
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WUJIANG CASTING HYDRAULIC PARTS FOUNDRY CO Ltd
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WUJIANG CASTING HYDRAULIC PARTS FOUNDRY CO Ltd
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Abstract

The invention discloses a kind of easy defeated and dispersed precoated sand and preparation method thereof.Precoated sand is made up of the raw material of following parts by weight: roughing sand, silane coupler, binding agent, firming agent, additive and lubricant;Described roughing sand crosses 300 mesh sieves, is made up of the fresh sand of 80% and the old sand of 20%;Preparation method comprises the following steps: (1) prepares binding agent: epoxy resin and modified starch is placed in blender and stirs, and is sequentially added into clay and silicone oil, stirs 20-40min, obtains binding agent;(2) firming agent is prepared: polyethylene polyamine, polyurethane and fatty amine are placed in ball mill dry ball milling 60-80min according to weight parts by weight, obtain firming agent;(3) mixing: be placed in puddle mixer by roughing sand heating to 35-40 DEG C, add binding agent, silane coupler and lubricant, after being sufficiently mixed, adds additive under normal temperature condition, is eventually adding after firming agent is sufficiently mixed and obtains precoated sand.

Description

A kind of easy defeated and dispersed precoated sand and preparation method thereof
Technical field
The present invention relates to a kind of easy defeated and dispersed precoated sand and preparation method thereof, belong to foundary industry technical field.
Background technology
Precoated sand is covered with molding sand or the core sand of one layer of hard resin film on sand grain surface before referring to moulding.Having cold process and two kinds of coating techniques of Re Fa: resin is dissolved by cold process ethanol, and add hexamethylenamine in mulling process, make the two be coated on sand grain surface, ethanol volatilizees, and obtains precoated sand;Full-boiled process is preheating to uniform temperature sand, adds resin and makes it melt, and stirring makes resin-coating at sand grain surface, adds hexamethylenamine aqueous solution and lubricant, cools down, crushes, sieves to obtain precoated sand.For steel-casting, ironcasting.Owing to precoated sand has, intensity height, gas forming amount are low, produce casting dimension accuracy height, any surface finish, be easy to the advantages such as preservation, apply increasingly extensive in recent years.
Application number is the formula that 201310068698.6 " heat-resistance stainless steel foundry goods precoated sands " disclose a kind of precoated sand, including 80~85 parts of roughing sand, 1.5~2.5 parts of phenolic resin, 15~20 parts of nice foundry sand, 12~16 parts of lubricants, 4~6 parts of dispersants and hexamethylenamine.Although this invention intensity is high, high temperature resistant, but its poor fluidity, easily scab on foundry goods.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of easy defeated and dispersed precoated sand and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of easy defeated and dispersed precoated sand, is made up of the raw material of following parts by weight: roughing sand 100 parts, silane coupler 2-4 part, binding agent 1.5-2.5 part, firming agent 0.1-0.5 part, additive 1-3 part and lubricant 0.5-1.5 part;Described roughing sand crosses 300 mesh sieves, it is made up of the fresh sand of 80% and the old sand of 20%, described binding agent is epoxy resin, clay, silicone oil and modified starch, described firming agent is polyethylene polyamine, polyurethane and fatty amine, described additive is boron carbide, ethyl acetate and sugar alcohol, and described lubricant is calcium stearate;Described modified starch is obtained through the following steps: be placed in by starch in the water that temperature is 48-52 DEG C, it is sufficiently stirred for, after mix homogeneously, regulate PH to 4.8-5.5, add α-amylase and glucoamylase, react 40-60min, be placed in ultrasonic oscillator, sonic oscillation 30-40min, add acrylamide, react 50-70min, obtain modified starch.
The easy defeated and dispersed precoated sand of described one, in described fresh sand, the content of silicon dioxide is more than 98%, and in described old sand, the content of silicon dioxide is more than 80%.
The easy defeated and dispersed precoated sand of described one, in described binding agent, the parts by weight of each component are respectively as follows: epoxy resin 20-30 part, clay 5-8 part, silicone oil 12-18 part and modified starch 15-20 part.
The easy defeated and dispersed precoated sand of described one, in described firming agent, the parts by weight of each component are respectively as follows: polyethylene polyamine 20-30 part, polyurethane 4-7 part and fatty amine 4-7 part.
The easy defeated and dispersed precoated sand of described one, in described additive, the parts by weight of each component are respectively as follows: boron carbide 20-30 part, ethyl acetate 12-18 part and sugar alcohol 2-4 part.
The easy defeated and dispersed precoated sand of described one, adds 0.1-0.3% and the 0.05-0.15% of the amount respectively starch weight of α-amylase and glucoamylase, adds 2-3 times that amount is starch weight of acrylamide.
The preparation method of described a kind of easy defeated and dispersed precoated sand, comprises the following steps:
(1) prepare binding agent: epoxy resin and modified starch are placed in blender and stir, be sequentially added into clay and silicone oil, stir 20-40min, obtain binding agent;
(2) firming agent is prepared: polyethylene polyamine, polyurethane and fatty amine are placed in ball mill dry ball milling 60-80min according to weight parts by weight, obtain firming agent;
(3) mixing: be placed in puddle mixer by roughing sand heating to 35-40 DEG C, add binding agent, silane coupler and lubricant, after being sufficiently mixed, adds additive under normal temperature condition, is eventually adding after firming agent is sufficiently mixed and obtains precoated sand.
The beneficial effect that the present invention reaches:
The precoated sand preparation method of the present invention is simple, formula is reasonable, as binding agent after being mixed with epoxy resin, clay and silicone oil by modified starch, as firming agent after polyethylene polyamine, polyurethane and fatty amine mixing, react to each other with caking property, improve the collapsibility of precoated sand.Lubricant improves the mobility of precoated sand, and the precoated sand of the present invention is especially suitable for the casting of non-ferrous casting;Tests prove that, the precoated sand room temperature bending strength of the present invention is 8-9MPa, and burning decrement is 0.5-1.3%, and hot bending strength is 2.8-3.2MPa.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Embodiment 1
In the present embodiment, a kind of easy defeated and dispersed precoated sand, it is made up of the raw material of following parts by weight: roughing sand 100 parts, silane coupler 4 parts, binding agent 1.5 parts, 0.5 part of firming agent, additive 1 part and lubricant 1.5 parts;Described roughing sand crosses 300 mesh sieves, is made up of the fresh sand of 80% and the old sand of 20%, and in described binding agent, the parts by weight of each component are respectively as follows: epoxy resin 20 parts, clay 8 parts, silicone oil 18 parts and modified starch 15 parts.In described firming agent, the parts by weight of each component are respectively as follows: polyethylene polyamine 30 parts, polyurethane 7 parts and fatty amine 4 parts.In described additive, the parts by weight of each component are respectively as follows: boron carbide 30 parts, ethyl acetate 12 parts and sugar alcohol 4 parts, described modified starch is obtained through the following steps: be placed in by starch in the water that temperature is 52 DEG C, it is sufficiently stirred for, after mix homogeneously, regulates PH to 5.5, add α-amylase and glucoamylase, reaction 40min, it is placed in ultrasonic oscillator, sonic oscillation 30min, add acrylamide, reaction 50min, obtains modified starch.
Wherein, in described fresh sand, the content of silicon dioxide is more than 98%, and in described old sand, the content of silicon dioxide is more than 80%;The 0.3% and 0.05% of the amount respectively starch weight of addition α-amylase and glucoamylase, adds 3 times that amount is starch weight of acrylamide.
The preparation method of described a kind of easy defeated and dispersed precoated sand, comprises the following steps:
(1) prepare binding agent: epoxy resin and modified starch are placed in blender and stir, be sequentially added into clay and silicone oil, stir 40min, obtain binding agent;
(2) firming agent is prepared: polyethylene polyamine, polyurethane and fatty amine are placed in ball mill dry ball milling 80min according to weight parts by weight, obtain firming agent;
(3) mixing: be placed in puddle mixer by roughing sand heating to 40 DEG C, add binding agent, silane coupler and lubricant, after being sufficiently mixed, adds additive under normal temperature condition, is eventually adding after firming agent is sufficiently mixed and obtains precoated sand.
Embodiment 2
In the present embodiment, a kind of easy defeated and dispersed precoated sand, it is made up of the raw material of following parts by weight: roughing sand 100 parts, silane coupler 2 parts, binding agent 2.5 parts, 0.1 part of firming agent, additive 3 parts and lubricant 1.5 parts;Described roughing sand crosses 300 mesh sieves, is made up of the fresh sand of 80% and the old sand of 20%;In described binding agent, the parts by weight of each component are respectively as follows: epoxy resin 30 parts, clay 5 parts, silicone oil 12 parts and modified starch 20 parts.In described firming agent, the parts by weight of each component are respectively as follows: polyethylene polyamine 30 parts, polyurethane 4 parts and fatty amine 7 parts.In described additive, the parts by weight of each component are respectively as follows: boron carbide 20 parts, ethyl acetate 18 parts and sugar alcohol 2 parts.Described modified starch is obtained through the following steps: be placed in by starch in the water that temperature is 48 DEG C, it is sufficiently stirred for, after mix homogeneously, regulate PH to 4.8, add α-amylase and glucoamylase, react 60min, be placed in ultrasonic oscillator, sonic oscillation 40min, add acrylamide, react 70min, obtain modified starch.
Wherein, in described fresh sand, the content of silicon dioxide is more than 98%, and in described old sand, the content of silicon dioxide is more than 80%;The 0.1% and 0.15% of the amount respectively starch weight of addition α-amylase and glucoamylase, adds 2 times that amount is starch weight of acrylamide.
The preparation method of described a kind of easy defeated and dispersed precoated sand, comprises the following steps:
(1) prepare binding agent: epoxy resin and modified starch are placed in blender and stir, be sequentially added into clay and silicone oil, stir 20min, obtain binding agent;
(2) firming agent is prepared: polyethylene polyamine, polyurethane and fatty amine are placed in ball mill dry ball milling 60min according to weight parts by weight, obtain firming agent;
(3) mixing: be placed in puddle mixer by roughing sand heating to 35 DEG C, add binding agent, silane coupler and lubricant, after being sufficiently mixed, adds additive under normal temperature condition, is eventually adding after firming agent is sufficiently mixed and obtains precoated sand.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.

Claims (4)

1. an easy defeated and dispersed precoated sand, is characterized in that, is made up of the raw material of following parts by weight: roughing sand 100 parts, silane coupler 2-4 part, binding agent 1.5-2.5 part, firming agent 0.1-0.5 part, additive 1-3 part and lubricant 0.5-1.5 part;Described roughing sand crosses 300 mesh sieves, it is made up of the fresh sand of 80% and the old sand of 20%, described binding agent is epoxy resin, clay, silicone oil and modified starch, described firming agent is polyethylene polyamine, polyurethane and fatty amine, described additive is boron carbide, ethyl acetate and sugar alcohol, and described lubricant is calcium stearate;Described modified starch is obtained through the following steps: be placed in by starch in the water that temperature is 48-52 DEG C, it is sufficiently stirred for, after mix homogeneously, regulate PH to 4.8-5.5, add α-amylase and glucoamylase, react 40-60min, be placed in ultrasonic oscillator, sonic oscillation 30-40min, add acrylamide, react 50-70min, obtain modified starch;In described binding agent, the parts by weight of each component are respectively as follows: epoxy resin 20-30 part, clay 5-8 part, silicone oil 12-18 part and modified starch 15-20 part;In described firming agent, the parts by weight of each component are respectively as follows: polyethylene polyamine 20-30 part, polyurethane 4-7 part and fatty amine 4-7 part;In described additive, the parts by weight of each component are respectively as follows: boron carbide 20-30 part, ethyl acetate 12-18 part and sugar alcohol 2-4 part.
2. the easy defeated and dispersed precoated sand of one according to claim 1, is characterized in that, in described fresh sand, the content of silicon dioxide is more than 98%, and in described old sand, the content of silicon dioxide is more than 80%.
3. the easy defeated and dispersed precoated sand of one according to claim 1, is characterized in that, adds 0.1-0.3% and the 0.05-0.15% of the amount respectively starch weight of α-amylase and glucoamylase, adds 2-3 times that amount is starch weight of acrylamide.
4. the preparation method of a kind of easy defeated and dispersed precoated sand according to any of the above claim, is characterized in that, comprise the following steps:
(1) prepare binding agent: epoxy resin and modified starch are placed in blender and stir, be sequentially added into clay and silicone oil, stir 20-40min, obtain binding agent;
(2) firming agent is prepared: polyethylene polyamine, polyurethane and fatty amine are placed in ball mill dry ball milling 60-80min according to weight parts by weight, obtain firming agent;
(3) mixing: be placed in puddle mixer by roughing sand heating to 35-40 DEG C, add binding agent, silane coupler and lubricant, after being sufficiently mixed, adds additive under normal temperature condition, is eventually adding after firming agent is sufficiently mixed and obtains precoated sand.
CN201410430800.7A 2014-08-29 2014-08-29 A kind of easy defeated and dispersed precoated sand and preparation method thereof Active CN104226888B (en)

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CN104801664B (en) * 2015-03-31 2017-06-13 共享装备有限公司 A kind of molding sand method for mixing for sand mold 3D printing
CN105195668A (en) * 2015-10-08 2015-12-30 蚌埠冠宜型材科技有限公司 Casting molding sand adhesive for improving flowability
CN105689634B (en) * 2015-12-28 2018-01-09 合肥仁创铸造材料有限公司 A kind of anti-sintering precoated sand
CN105945206B (en) * 2016-05-23 2019-01-22 无锡市嘉邦电力管道厂 A kind of precoated sand resistant to high temperature
CN107096869A (en) * 2017-06-22 2017-08-29 安徽银力铸造有限公司 A kind of preparation method of conductive polycrystalline mullite fiber reinforced epoxy sand
CN107214292A (en) * 2017-06-28 2017-09-29 安徽华飞机械铸锻有限公司 A kind of moulding sand for casting and preparation method thereof
CN107716844A (en) * 2017-09-29 2018-02-23 吴江市液铸液压件铸造有限公司 A kind of processing technology of automobile output shaft casting
CN107838364A (en) * 2017-10-12 2018-03-27 东风精密铸造安徽有限公司 A kind of environment-friendly type casting material and preparation method thereof
CN110877964A (en) * 2019-09-12 2020-03-13 杨国曙 Environment-friendly energy-saving coated color sand and manufacturing method thereof
CN110614342B (en) * 2019-10-24 2021-06-22 福建省同兴汽车同步器有限公司石狮鸿山分公司 Regenerative casting precoated sand using waste sand as raw material and preparation process thereof

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CN103231008A (en) * 2013-04-16 2013-08-07 繁昌县恒鑫汽车零部件有限公司 High temperature resistance precoated sand
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US2834741A (en) * 1954-05-12 1958-05-13 Ford Motor Co Sand coating
US4345003A (en) * 1978-04-18 1982-08-17 Sumitomo Durez Company, Ltd. Resol phenolic resin binder for hot coating of foundry sand
JPS5623340A (en) * 1979-08-02 1981-03-05 Sintokogio Ltd Binder for mold and coating sand used it, and molding method of mold used said binder
JPS63188442A (en) * 1987-01-30 1988-08-04 Aisin Chem Co Ltd Resin coating sand grain for shell mold
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