CN109365740B - Preparation method of thermal-stable precoated sand - Google Patents
Preparation method of thermal-stable precoated sand Download PDFInfo
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- CN109365740B CN109365740B CN201811266415.8A CN201811266415A CN109365740B CN 109365740 B CN109365740 B CN 109365740B CN 201811266415 A CN201811266415 A CN 201811266415A CN 109365740 B CN109365740 B CN 109365740B
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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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
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Abstract
The invention discloses a preparation method of thermostable precoated sand, and belongs to the technical field of building materials. The invention firstly takes quartz sand as raw material, the quartz sand is crushed and sieved to obtain sieved powder, then methyl trimethoxy silane, diamino diphenyl sulfone and distilled water are taken as raw material, zinc isozincate is added as curing agent, the thermal stability of the silicon resin is improved, unsaturated bonds such as double bond, triple bond and the like do not exist in chain segment of the silicon resin, so that the silicon resin is not easy to absorb ultraviolet ray and is not easy to be oxidized by ozone to cause aging, the weather resistance is strong, the invention takes fatty acid, isophthalic acid, glycol and xylene as raw materials, heating to synthesize alkyd resin under the protection of nitrogen, wherein the alkyd resin has good flexibility, adhesive force and physical and mechanical properties, quartz sand is preheated to a certain temperature, modified resin is added to melt the quartz sand, the modified silicon resin is coated on the surface of sand grains by stirring, so that the flowability of the coated sand is ensured, and the coating has a wide application prospect.
Description
Technical Field
The invention discloses a preparation method of thermostable precoated sand, and belongs to the technical field of building materials.
Background
The surface of the coated sand is coated with a layer of molding sand or core sand of solid resin film before molding. The precoated sand mainly adopts high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials. According to different technical requirements of users, the proportion is properly adjusted in the aspects of curing speed, demoulding property, fluidity, collapsibility, casting surface finish, storage and the like. There are two film-coating processes of cold method and hot method: dissolving the resin with ethanol by a cold method, adding urotropine in the sand mixing process to coat the urotropine and the sand on the surface of sand grains, and volatilizing the ethanol to obtain precoated sand; the heat method is to preheat the sand to a certain temperature, add resin to melt the sand, stir the sand to coat the resin on the surface of the sand, add urotropine water solution and lubricant, cool, crush and screen the sand to obtain the precoated sand.
The technological process of precoated sand is to mix powdered thermosetting phenolic resin with raw sand mechanically and cure the mixture while heating. Then, the method is developed to use thermoplastic phenolic resin, latent curing agent (urotropine) and lubricant to prepare precoated sand through a certain coating process, when the precoated sand is heated, the resin coated on the surface of sand is melted, and the melted resin is quickly converted from a linear structure into a non-melted body structure under the action of methylene decomposed from the urotropine, so that the precoated sand is cured and molded. The Chinese precoated sand technology starts in the middle of the 50 th century of the 20 th century and enters the 80 th century, and due to the rapid development of the automobile industry and the requirement of mechanical product export, higher requirements are put forward on the quality of castings, so that the rapid development of precoated sand production and application technologies is promoted. Along with the progress of engine technology, some novel cylinder bodies appearing in recent years have structures with larger carrying process difficulty. For example, the side surface of the water cavity is not provided with a sand outlet, the oil channel cavity penetrates through the whole cylinder body and has large curvature, a narrow water passing structure is arranged in the water cavity, and even a casting integrally cast by the cylinder barrel and the cylinder cover is produced.
When the precoated sand prepared by the traditional process is used for making cores in casting production, the flowability is poor, so that the precoated sand is easy to stick sand on castings, and the thermal stability at high temperature is poor, so that the precoated sand cannot resist the thermal stress generated by expansion of the sand core in the casting production process, and the cracking molten metal of the sand core permeates to cause the castings to generate cracks.
Therefore, the invention of the thermal-stable precoated sand with good thermal stability and good fluidity has positive significance in the technical field of building materials.
Disclosure of Invention
The invention mainly solves the technical problems that the precoated sand on the market at present has poor fluidity, so that the precoated sand is easy to stick sand on a casting, and the precoated sand has poor thermal stability, so that the precoated sand cannot resist the thermal stress generated by expansion of a sand core in the process of casting to produce the casting, so that the cracking molten metal of the sand core permeates to cause the cracking of the casting, and the preparation method of the thermal stable precoated sand is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of thermal-stable precoated sand is characterized by comprising the following specific preparation steps:
(1) putting quartz sand into a pulverizer to be pulverized, sieving the pulverized quartz sand by a 100-mesh sieve, and collecting sieved powder to obtain pulverized quartz sand for later use;
(2) mixing methyltrimethoxysilane, diamino diphenyl sulfone and distilled water, pouring the mixture into a reflux device, stirring and refluxing for 4-5 h at the temperature of 60-70 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 h at the temperature of 140-150 ℃ to obtain a mixture;
(3) adding zinc isooctanoate into the mixture, stirring for 30-40 min, and cooling to room temperature to obtain methyl phenyl silicone resin for later use;
(4) pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-neck flask, introducing nitrogen into the four-neck flask until all air is replaced, and heating to 120-150 ℃ under the protection of the nitrogen to obtain alkyd resin;
(5) mixing the standby methyl phenyl silicone resin with the alkyd resin, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 hours at the temperature of 100-110 ℃ to obtain modified silicone resin;
(6) putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 1-2 hours at the temperature of 130-150 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicone resin and silicone oil into the reaction kettle, stirring and reacting for 30-60 minutes at the temperature of 130-150 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 30-40% of the mass of the mixed solution into the reaction kettle, stirring for 25-35 minutes, and cooling to room temperature to obtain the heat-stable precoated sand.
The crushing time in the step (1) is 45-60 min.
The mass ratio of the methyltrimethoxysilane, the diamino diphenyl sulfone and the distilled water in the step (2) is 13: 7: 13.
The mass of the zinc isooctanoate in the step (3) is 2-4% of the mass of the mixture.
The mass ratio of the fatty acid, the isophthalic acid, the ethylene glycol and the xylene in the step (4) is 2: 3: 2.
The mass ratio of the standby methyl phenyl silicone resin in the step (5) to the alkyd resin is 1: 1.
The mass ratio of the preheated quartz sand in the step (6), the modified silicon resin and the silicon oil is 2: 1.
The invention has the beneficial effects that:
(1) the invention firstly uses quartz sand as raw material, and crushes and sieves it to obtain sieving powder, then uses methyl trimethoxy silane, diamino diphenyl sulfone, distilled water as raw material, adds zinc iso-octoate as solidifying agent, synthesizes methyl phenyl silicon resin, uses fatty acid, m-phthalic acid, glycol, xylene as raw material, heats and synthesizes alkyd resin under the protection of nitrogen, combines methyl phenyl silicon resin and alkyd resin through heating dehydration reaction to obtain modified silicon resin, preheats quartz sand to a certain temperature, adds modified silicon resin to melt, stirs to make modified silicon resin coat sand surface, magnesium stearate and silicone oil separately add in and stir to obtain heat stable type coated sand Distilled water is used as raw material, zinc isooctanoate is added as curing agent to synthesize methyl phenyl silicone resin, which is a high temperature resistant thermosetting resin, because the bond energy of the Si-O-Si bond is very high, the energy required for destroying the main chain structure is far higher than that of the C-C main chain structure of other resins, therefore, the high-heat-resistance polyphenyl silicone resin has excellent heat resistance, can form Si-O-Si bonds with higher crosslinking degree after being heated, prevents the main chain from being broken and degraded by heating, and a protective layer containing a large number of Si-O-Si bonds is formed on the surface to reduce the influence of high temperature on the protective layer, thereby improving the thermal stability of the silicon resin, and the chain segment of the silicon resin does not have double bond, triple bond and other unsaturated bonds, so that the silicon resin is not easy to absorb ultraviolet rays and is not easy to be oxidized by ozone to cause aging, the precoated sand prepared by using the material as a raw material has excellent thermal stability;
(2) the invention takes fatty acid, isophthalic acid, glycol and xylene as raw materials, the alkyd resin is synthesized by heating under the protection of nitrogen, the alkyd resin has good flexibility, adhesive force and physical and mechanical properties, the source is wide, the price is low, the methyl phenyl silicone resin and the alkyd resin are dehydrated under the high temperature condition to obtain the modified silicone resin, the modified silicone resin has the properties of the alkyd resin while having the properties of the silicone resin, the water resistance and heat resistance of the modified resin are improved, the adhesive force is enhanced, so that the modified resin is firmly attached to the surface of sand grains, the thermal stability of the precoated sand prepared by the invention is improved, after quartz sand is preheated to a certain temperature, the modified resin is added to be melted, the modified silicone resin is coated on the surface of the sand grains by stirring, magnesium stearate and silicone oil are separately added for stirring, and the fluidity of the precoated sand is ensured, has wide application prospect.
Detailed Description
Putting quartz sand into a crusher, crushing for 45-60 min, then sieving with a 100-mesh sieve, and collecting sieved powder to obtain crushed quartz sand for later use; mixing methyltrimethoxysilane, diaminodiphenyl sulfone and distilled water according to a mass ratio of 13: 7: 13, pouring the mixture into a reflux device, stirring and refluxing for 4-5 h at the temperature of 60-70 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 h at the temperature of 140-150 ℃ to obtain a mixture; adding zinc isooctate accounting for 2-4% of the mass of the mixture into the mixture, stirring for 30-40 min, and cooling to room temperature to obtain methyl phenyl silicone resin for later use; pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-mouth flask according to the mass ratio of 2: 3: 2, introducing nitrogen into the four-mouth flask until all air is replaced, and heating to 120-150 ℃ under the protection of the nitrogen to obtain alkyd resin; mixing the standby methyl phenyl silicone resin and the alkyd resin according to the mass ratio of 1: 1, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 hours at the temperature of 100-110 ℃ to obtain modified silicone resin; putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 1-2 hours at the temperature of 130-150 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicon resin and silicon oil into the reaction kettle according to the mass ratio of 2: 1, stirring and reacting for 30-60 min at the temperature of 130-150 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 30-40% of the mass of the mixed solution into the reaction kettle, stirring for 25-35 min, and cooling to room temperature to obtain the heat-stable precoated sand.
Example 1
Putting quartz sand into a pulverizer, pulverizing for 45min, sieving with a 100-mesh sieve, and collecting sieved powder to obtain pulverized quartz sand for later use; mixing methyltrimethoxysilane, diaminodiphenyl sulfone and distilled water according to a mass ratio of 13: 7: 13, pouring the mixture into a reflux device, stirring and refluxing for 4 hours at the temperature of 60 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 140 ℃ to obtain a mixture; adding zinc isooctate accounting for 2 percent of the mass of the mixture into the mixture, stirring for 30min, and cooling to room temperature to obtain methylphenyl silicon resin for later use; pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-mouth flask according to the mass ratio of 2: 3: 2, introducing nitrogen into the four-mouth flask until all air is replaced, and heating to 120 ℃ under the protection of nitrogen to obtain alkyd resin; mixing the standby methyl phenyl silicone resin and the alkyd resin according to the mass ratio of 1: 1, pouring the mixture into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 100 ℃ to obtain modified silicone resin; putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 1h at the temperature of 130 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicon resin and the silicon oil into the reaction kettle according to the mass ratio of 2: 1, stirring and reacting for 30min at the temperature of 130 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 30% of the mixed solution by mass into the reaction kettle, stirring for 25min, and cooling to room temperature to obtain the heat-stable precoated sand.
Example 2
Putting quartz sand into a pulverizer, pulverizing for 50min, sieving with a 100-mesh sieve, and collecting sieved powder to obtain pulverized quartz sand for later use; mixing methyltrimethoxysilane, diaminodiphenyl sulfone and distilled water according to a mass ratio of 13: 7: 13, pouring the mixture into a reflux device, stirring and refluxing for 4.5 hours at the temperature of 65 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 2.5 hours at the temperature of 145 ℃ to obtain a mixture; adding zinc isooctate with the mass of 3% of the mixture into the mixture, stirring for 35min, and cooling to room temperature to obtain methylphenyl silicone resin for later use; pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-mouth flask according to the mass ratio of 2: 3: 2, introducing nitrogen into the four-mouth flask until all air is replaced, and heating to 140 ℃ under the protection of nitrogen to obtain alkyd resin; mixing the standby methyl phenyl silicone resin and the alkyd resin according to the mass ratio of 1: 1, pouring the mixture into a reaction kettle, and stirring and reacting for 2.5 hours at the temperature of 105 ℃ to obtain modified silicone resin; putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 1.5h at the temperature of 140 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicon resin and the silicon oil into the reaction kettle according to the mass ratio of 2: 1, stirring and reacting for 40min at the temperature of 140 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 35% of the mass of the mixed solution into the reaction kettle, stirring for 30min, and cooling to room temperature to obtain the heat-stable precoated sand.
Example 3
Putting quartz sand into a pulverizer, pulverizing for 60min, sieving with a 100-mesh sieve, and collecting sieved powder to obtain pulverized quartz sand for later use; mixing methyltrimethoxysilane, diaminodiphenyl sulfone and distilled water according to a mass ratio of 13: 7: 13, pouring the mixture into a reflux device, stirring and refluxing for 4-5 h at the temperature of 70 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 3h at the temperature of 150 ℃ to obtain a mixture; adding zinc isooctate with the mass of 4% of the mixture into the mixture, stirring for 40min, and cooling to room temperature to obtain methylphenyl silicone resin for later use; pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-mouth flask according to the mass ratio of 2: 3: 2, introducing nitrogen into the four-mouth flask until all air is replaced, and heating to 150 ℃ under the protection of the nitrogen to obtain alkyd resin; mixing the standby methyl phenyl silicone resin and the alkyd resin according to the mass ratio of 1: 1, pouring the mixture into a reaction kettle, and stirring and reacting for 3 hours at the temperature of 110 ℃ to obtain modified silicone resin; putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 2h at the temperature of 150 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicon resin and the silicon oil into the reaction kettle according to the mass ratio of 2: 1, stirring and reacting for 60min at the temperature of 150 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 40% of the mixed solution by mass into the reaction kettle, stirring for 35min, and cooling to room temperature to obtain the heat-stable precoated sand.
Comparative example
The performance of the thermal stabilization type precoated sand prepared by the invention and the thermal stabilization type precoated sand in the comparative example are tested by taking the thermal stabilization type precoated sand produced by Shenzhen company as the comparative example, and the test results are shown in Table 1:
the test method comprises the following steps:
the tensile strength and bending strength tests were tested according to JBT 8583-2008.
The thermal expansion rate test is carried out according to the test standard of Special casting and non-ferrous alloy.
And (3) high temperature resistance test: the precoated sands of examples 1 to 3 and comparative example were placed at a high temperature of 1200 ℃, and after 6 seconds, the high-temperature strength was measured and the breakage time, i.e., the heat-resistant and heat-resistant time, of each of the precoated sands was measured.
The gas evolution and the ignition loss test are carried out by adopting a gas evolution tester for casting molding materials according to the industrial standard 'precoated sand for casting'.
TABLE 1 precoated sand Performance measurement results
According to the detection data, the thermal stabilization type precoated sand disclosed by the invention is high in strength, high in tensile strength and bending strength in a high-temperature environment, low in thermal expansion rate, good in high-temperature resistance, good in fluidity, easy to fill, capable of preventing castings from sand sticking and generating cracks, and wide in application prospect.
Claims (7)
1. A preparation method of thermal-stable precoated sand is characterized by comprising the following specific preparation steps:
(1) putting quartz sand into a pulverizer to be pulverized, sieving the pulverized quartz sand by a 100-mesh sieve, and collecting sieved powder to obtain pulverized quartz sand for later use;
(2) mixing methyltrimethoxysilane, diamino diphenyl sulfone and distilled water, pouring the mixture into a reflux device, stirring and refluxing for 4-5 h at the temperature of 60-70 ℃, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 h at the temperature of 140-150 ℃ to obtain a mixture;
(3) adding zinc isooctanoate into the mixture, stirring for 30-40 min, and cooling to room temperature to obtain methyl phenyl silicone resin for later use;
(4) pouring fatty acid, isophthalic acid, ethylene glycol and xylene into a four-neck flask, introducing nitrogen into the four-neck flask until all air is replaced, and heating to 120-150 ℃ under the protection of the nitrogen to obtain alkyd resin;
(5) mixing the standby methyl phenyl silicone resin with the alkyd resin, pouring the mixture into a reaction kettle, and stirring and reacting for 2-3 hours at the temperature of 100-110 ℃ to obtain modified silicone resin;
(6) putting the standby crushed quartz sand into a reaction kettle, stirring and reacting for 1-2 hours at the temperature of 130-150 ℃ to obtain preheated quartz sand, pouring the preheated quartz sand, the modified silicone resin and silicone oil into the reaction kettle, stirring and reacting for 30-60 minutes at the temperature of 130-150 ℃, stopping heating to obtain a mixed solution, adding magnesium stearate accounting for 30-40% of the mass of the mixed solution into the reaction kettle, stirring for 25-35 minutes, and cooling to room temperature to obtain the heat-stable precoated sand.
2. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the crushing time in the step (1) is 45-60 min.
3. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the mass ratio of the methyltrimethoxysilane, the diamino diphenyl sulfone and the distilled water in the step (2) is 13: 7: 13.
4. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the mass of the zinc isooctanoate in the step (3) is 2-4% of the mass of the mixture.
5. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the mass ratio of the fatty acid, the isophthalic acid, the ethylene glycol and the xylene in the step (4) is 2: 3: 2.
6. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the mass ratio of the standby methyl phenyl silicone resin in the step (5) to the alkyd resin is 1: 1.
7. The method for preparing heat-stable precoated sand according to claim 1, wherein the method comprises the following steps: the mass ratio of the preheated quartz sand in the step (6), the modified silicon resin and the silicon oil is 2: 1.
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| CN114231057A (en) * | 2021-12-03 | 2022-03-25 | 广东自然涂化工有限公司 | High-environment-friendly self-cleaning batch scraping type stone-like paint and preparation method and application thereof |
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| CN104841862A (en) * | 2015-05-07 | 2015-08-19 | 马鞍山市恒毅机械制造有限公司 | Casting high-strength and high-temperature-resistant precoated sand and preparation method thereof |
| CN106318158A (en) * | 2015-06-15 | 2017-01-11 | 天长市开林化工有限公司 | High performance alkyd resin paint special for ships |
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