CN108907070B - Phosphate binder self-hardening sand curing agent and preparation method thereof - Google Patents
Phosphate binder self-hardening sand curing agent and preparation method thereof Download PDFInfo
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- CN108907070B CN108907070B CN201810995045.5A CN201810995045A CN108907070B CN 108907070 B CN108907070 B CN 108907070B CN 201810995045 A CN201810995045 A CN 201810995045A CN 108907070 B CN108907070 B CN 108907070B
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- sand
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- phosphate binder
- hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives
Abstract
The invention discloses a phosphate binder self-hardening sand curing agent and a preparation method thereof. The components are as follows: the metallurgical magnesite powder, silica sol, water, a coupling agent and urea. The preparation method comprises the following steps: (1) crushing and refining metallurgical magnesia powder particles; (2) adding urea, silica sol and a coupling agent into water respectively, and fully stirring to obtain a uniform mixed solution; (3) slowly adding the mixed solution into metallurgical magnesia powder while stirring to obtain a uniform suspension liquid mixture; (4) and (4) putting the suspension liquid mixture obtained in the step (3) into a drying oven at 100 ℃ for full drying and dehydration, taking out, and crushing into fine powder. The using method comprises the following steps: firstly, uniformly mixing a curing agent and raw sand, then adding a phosphate binder, uniformly mixing, then discharging sand, pouring the uniformly mixed sand material into a standard 8-shaped sample mold for sample preparation, and demolding and storing after hardening. The phosphate binder self-hardening sand curing agent disclosed by the invention is simple in preparation process, and the prepared self-hardening sand is good in performance, stable in storage, green, environment-friendly and pollution-free.
Description
Technical Field
The invention relates to the field of molding materials in the casting industry, in particular to a phosphate binder self-hardening sand curing agent and a preparation method thereof.
Background
With the increasingly strict environmental protection supervision, people are aroused from environmental awareness and cannot neglect the environmental pollution problem caused by the traditional organic resin binder, but the traditional inorganic binder has no ideal effect in practical application due to various problems of low molding strength, poor collapsibility of molding sand and the like. It is urgent to find a new inorganic binder capable of replacing the conventional organic resin sand.
The phosphate binder is a green environment-friendly casting binder, has the advantages of low curing temperature, good heat resistance, small gas evolution, good high-temperature collapsibility, good reusability, simple process, low cost and the like, and is a molding material with application value and application prospect. At present, the phosphate binder sand is mainly cured by heating and is self-hardened by a reinforcing agent, and a sand core prepared by heating and hardening has high initial strength, is easy to absorb moisture, is greatly influenced by the environment and has extremely strict requirements on the storage environment, so that the use of the sand core in casting production is greatly restricted. The curing agent is used for curing, so that the molding sand can be hardened and molded at normal temperature, the energy consumption can be reduced, and the working environment of operators can be improved in production. The former is solidified by heating and physical dehydration, the sand mould (core) losing water during storage is very easy to absorb moisture, and the latter is formed into stable compound by chemical reaction. However, the alkali metal-based curing agents used at present are inferior in strength stability during storage.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a novel curing agent applied to phosphate self-hardening sand, which replaces the technical problem of unstable strength in the storage process of the existing sand mould (core) prepared by the curing agent matched with a phosphate binder.
The invention also aims to provide a preparation method of the novel curing agent, which adopts the combined action of mechanical stirring, surface coating and mechanical stirring to coat the auxiliary material on the surface of the metallurgical magnesia powder particles to obtain the curing agent with better performance.
It is still another object of the present invention to provide a method for using the above novel curing agent.
The purpose of the invention is achieved by the following technical scheme:
in a first aspect, a phosphate binder self-hardening sand curing agent is provided, which comprises the following components in percentage by weight: 44.06% -45.17% of crushed metallurgical magnesite powder, wherein the crushed metallurgical magnesite powder is prepared by crushing metallurgical magnesite powder to the granularity of 1300-1600 meshes by using a crusher, 6.13% -7.48% of silica sol, 1.44% -2.22% of silane coupling agent KH550, 2.22% -2.99% of urea and 42.99% -45.98% of water.
The silica sol described above is of industrial grade.
The urea is of analytical grade.
The water is purified water.
In a second aspect, a preparation method of the phosphate binder self-hardening sand curing agent is provided, which comprises the following steps:
(1) crushing the metallurgical magnesia powder to the granularity of 1300-1600 meshes by using a crusher;
(2) weighing the crushed magnesia powder, silica sol, urea, water and a silane coupling agent KH550 according to the proportion for later use;
(3) adding water accounting for about 40-50% of the total water amount into the stirring barrel, and starting the stirrer;
(4) adding urea, silica sol and a silane coupling agent KH550 into a stirring barrel respectively, stirring, slowly adding the rest water, stirring uniformly, and discharging;
(5) slowly adding the product obtained in the step (4) into crushed metallurgical magnesia powder, and fully stirring until the mixed solution is uniform and has no obvious particles, so as to obtain a suspension liquid mixture;
(6) and (3) placing the suspension liquid mixture into a drying oven at 100 ℃ for dehydration and drying for 6 hours, taking out, and fully crushing by using a crusher to obtain the powdery curing agent with the granularity of 325-400 meshes.
The technical principle of the invention is as follows: the main component of the curing agent is metallurgical magnesite powder which can be subjected to curing reaction with a phosphate binder, so that a sample has certain strength and better moisture absorption resistance, but the metallurgical magnesite powder has high activity, excessively high reaction speed and lower strength. The surface of the metallurgical magnesite powder is coated with the coupling agent and the silica sol, so that the reaction activity of the metallurgical magnesite powder is reduced, and the bonding strength of the bonding agent can be improved. The urea is used for slowing down the reaction speed of the silica sol and the coupling agent. The water is used as a reaction medium and can dissolve and dilute the coupling agent, the urea and the silica sol, so that all the components can be fully combined with the metallurgical magnesite powder to coat the metallurgical magnesite powder on the surface.
And thirdly, providing a use method of the phosphate binder self-hardening sand curing agent, weighing the phosphate binder accounting for 2.5 percent of the weight of the raw sand and the curing agent accounting for 10 percent of the weight of the binder for standby, mixing and stirring the raw sand and the curing agent for 90s, then adding the phosphate binder, stirring for 60s, then discharging the sand, pouring the sand into a standard 8-shaped mold to prepare a sand sample, drawing the mold after hardening for 20-30min, demolding and storing after hardening, testing the tensile strength once every 24 hours, and testing for four times in total.
The invention has the beneficial effects that: according to the invention, through a combined treatment mode of mechanical crushing, surface coating and mechanical stirring, firstly, metallurgical magnesite powder is fully crushed, the specific surface area of the powder is increased, then through a surface coating mode, auxiliaries such as silica sol, a coupling agent and the like are coated on the surface of the metallurgical magnesite powder to form uniform turbid liquid, and then the uniform turbid liquid is dried and crushed to obtain a finished product curing agent. Because the granularity of the crushed metallurgical magnesite powder is small, under the action of water, the auxiliary agents such as urea, silica sol, coupling agent and the like can be fully wetted and coated on the surface of the powder, and the reaction speed of the metallurgical magnesite powder and the binding agent can be slowed down; the finished curing agent obtained by drying and crushing has small granularity, and can refine the cured product, thereby improving the strength of the sample. The powder curing agent prepared by the invention has the advantages of simple preparation process, good performance, stable storage, environmental protection and no pollution.
Detailed Description
Further features and advantages of the present invention will be understood from the following detailed description. The examples provided are merely illustrative of the method of the present invention and do not limit the remainder of the disclosure in any way.
Comparative example:
weighing 1000g of raw sand, 25g of phosphate binder and 2.5g of metallurgical magnesia powder as a curing agent for later use. Mixing and stirring raw sand and the curing agent for 90s, adding phosphate binder, stirring for 60s, discharging sand, pouring into a standard 8-shaped mould to prepare a sand sample, hardening for 20-30min, demoulding and storing after hardening, and testing the tensile strength once every 24 hours.
Example 1
1) Crushing a certain amount of metallurgical magnesia powder until the granularity is 1300-1600 meshes;
2) weighing 100g of crushed metallurgical magnesia powder, 15g of silica sol, 5g of coupling agent, 5g of urea and 100g of water for later use;
3) adding 50g of water in the step 2) into a stirring barrel, starting a stirrer, respectively adding the urea, the silica sol and the coupling agent into the stirring barrel, stirring, slowly adding the rest 50g of water, and continuously stirring until the water is uniform for later use;
4) slowly adding the mixed solution obtained in the step 3) into the magnesia powder obtained in the step 1), and stirring while adding until no obvious particles exist to obtain a suspension liquid mixture;
5) drying the suspension liquid mixture in an oven at 100 ℃ for 6 hours, taking out and crushing the suspension liquid mixture until the particle size is 325-400 meshes;
6) 1000g of raw sand, 25g of phosphate binder and 2.5g of curing agent are weighed for later use. Firstly, uniformly mixing a curing agent and raw sand, then adding a phosphate binder, uniformly mixing, then discharging sand, pouring the uniformly mixed sand material into a standard 8-shaped sample mold for sample preparation, demolding and storing after hardening, and testing the tensile strength once every 24 hours.
Example 2
1) Crushing a certain amount of metallurgical magnesia powder until the granularity is 1300-1600 meshes;
2) weighing 110g of crushed magnesia powder, 18g of silica sol, 3.5g of coupling agent, 7g of urea and 105g of water for later use;
3) adding 50g of water in the step 2) into a stirring barrel, starting a stirrer, respectively adding the urea, the silica sol and the coupling agent into the stirring barrel, stirring, slowly adding the rest 60g of water, and continuously stirring until the water is uniform for later use;
4) slowly adding the mixed solution obtained in the step 3) into the magnesia powder obtained in the step 1), and stirring while adding until no obvious particles exist to obtain a suspension liquid mixture;
5) drying the suspension liquid mixture in an oven at 100 ℃ for 6 hours, taking out and crushing the suspension liquid mixture until the particle size is 325-400 meshes;
6) 1000g of raw sand, 25g of phosphate binder and 2.5g of curing agent are weighed for later use. Firstly, uniformly mixing a curing agent and raw sand, then adding a phosphate binder, uniformly mixing, then discharging sand, pouring the uniformly mixed sand material into a standard 8-shaped sample mold for sample preparation, demolding and storing after hardening, and testing the tensile strength once every 24 hours.
Example 3
1) Crushing a certain amount of metallurgical magnesia powder until the granularity is 1300-1600 meshes;
2) weighing 120g of crushed magnesia powder, 20g of silica sol, 4.5g of coupling agent, 8g of urea and 115g of water for later use;
3) adding 55g of water in the step 2) into a stirring barrel, starting a stirrer, respectively adding the urea, the silica sol and the coupling agent into the stirring barrel, stirring, slowly adding the rest 60g of water, and continuously stirring until the water is uniform for later use;
4) slowly adding the mixed solution obtained in the step 3) into the magnesia powder obtained in the step 1), and stirring while adding until no obvious particles exist to obtain a suspension liquid mixture;
5) drying the suspension liquid mixture in an oven at 100 ℃ for 6 hours, taking out and crushing the suspension liquid mixture until the particle size is 325-400 meshes;
6) 1000g of raw sand, 25g of phosphate binder and 2.5g of curing agent are weighed for later use. Firstly, uniformly mixing a curing agent and raw sand, then adding a phosphate binder, uniformly mixing, then discharging sand, pouring the uniformly mixed sand material into a standard 8-shaped sample mold for sample preparation, demolding and storing after hardening, and testing the tensile strength once every 24 hours.
Example 4
1) Crushing a certain amount of metallurgical magnesia powder until the granularity is 1300-1600 meshes;
2) weighing 115g of crushed magnesia powder, 16g of silica sol, 4g of coupling agent, 6g of urea and 120g of water for later use;
3) adding 60g of water in the step 2) into a stirring barrel, starting a stirrer, respectively adding the urea, the silica sol and the coupling agent into the stirring barrel, stirring, slowly adding the rest 60g of water, and continuously stirring until the water is uniform for later use;
4) slowly adding the mixed solution obtained in the step 3) into the magnesia powder obtained in the step 1), and stirring while adding until no obvious particles exist to obtain a suspension liquid mixture;
5) drying the suspension liquid mixture in an oven at 100 ℃ for 6 hours, taking out and crushing the suspension liquid mixture until the particle size is 325-400 meshes;
6) 1000g of raw sand, 25g of phosphate binder and 2.5g of curing agent are weighed for later use. Firstly, uniformly mixing a curing agent and raw sand, then adding a phosphate binder, uniformly mixing, then discharging sand, pouring the uniformly mixed sand material into a standard 8-shaped sample mold for sample preparation, demolding and storing after hardening, and testing the tensile strength once every 24 hours.
Test of Molding Sand Properties
Note: test temperature range: 20-35 ℃ and the humidity range of 30-60 percent
The curing agent for the phosphate binder provided by the invention has high dry strength and good strength stability in the storage process.
Claims (2)
1. A phosphate binder self-hardening sand curing agent is characterized in that: the phosphate binder self-hardening sand curing agent is prepared by the following steps:
(1) weighing the following components in percentage by weight: 44.06% -45.17% of crushed metallurgical magnesite powder, wherein the crushed metallurgical magnesite powder is prepared by crushing metallurgical magnesite powder to the granularity of 1300-1600 meshes by using a crusher, 6.13% -7.48% of silica sol, 1.44% -2.22% of silane coupling agent KH550, 2.22% -2.99% of urea and 42.99% -45.98% of water; the silica sol is industrial grade, the urea is analytical grade, and the water is pure water;
(2) adding water accounting for 40-50% of the total water into the stirring barrel, and starting a stirrer;
(3) adding urea, silica sol and a silane coupling agent KH550 into a stirring barrel respectively, stirring, slowly adding the rest water, stirring uniformly, and discharging;
(4) slowly adding the product obtained in the step (3) into crushed metallurgical magnesia powder, and fully stirring until the mixed solution is uniform and has no obvious particles, so as to obtain a suspension liquid mixture;
(5) and (3) placing the suspension liquid mixture into a drying oven at 100 ℃ for dehydration and drying for 6 hours, taking out, and fully crushing by using a crusher to obtain the powdery curing agent with the granularity of 325-400 meshes.
2. The method of using the phosphate binder self-hardening sand curing agent of claim 1, wherein: weighing a phosphate binder accounting for 2.5 percent of the weight of the raw sand and a curing agent accounting for 10 percent of the weight of the binder for standby, mixing and stirring the raw sand and the curing agent for 90s, then adding the phosphate binder, stirring for 60s, then discharging the sand, pouring the sand into a standard 8-shaped mold to prepare a sand sample, hardening for 20-30min, then stripping, hardening, demolding and storing.
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| CN109454200B (en) * | 2018-12-14 | 2020-04-24 | 湖北工业大学 | Liquid curing agent for phosphate binder and application thereof |
| CN112453314B (en) * | 2020-11-30 | 2022-04-22 | 湖北工业大学 | Curing agent for inorganic phosphate binder precoated sand and application thereof |
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| CN105855456B (en) * | 2016-04-13 | 2018-04-03 | 沈阳工业大学 | A kind of phosphate binders self-hardening sand curing agent and its preparation and application |
| CN105945209B (en) * | 2016-05-16 | 2018-06-19 | 湖北工业大学 | It is a kind of using water as phosphate binders hardening suspension curing agent of carrier and preparation method thereof |
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