CN103042165B - High-strength resin composition as well as preparation method and application thereof - Google Patents
High-strength resin composition as well as preparation method and application thereof Download PDFInfo
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- CN103042165B CN103042165B CN201310033126.4A CN201310033126A CN103042165B CN 103042165 B CN103042165 B CN 103042165B CN 201310033126 A CN201310033126 A CN 201310033126A CN 103042165 B CN103042165 B CN 103042165B
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Abstract
The invention discloses a high-strength resin composition. The high-strengthen resin composition is prepared from the following components in percentage by weight: furan resin, 0.5%-2% of silane, 2%-7% of iron oxide, 0.4%-1% of dibutyl phthalate, 30%-50% of sulfonic acid curing agent and 50%-90% of sands. The invention further discloses a preparation method of the high-strength resin composition and an application of the high-strength resin composition to the casting field. According to the high-strength resin composition, as well as the preparation method and the application thereof disclosed by the invention, an additive is added to the resin, so that the strength of the resin is improved, the usage amount of the resin is reduced, burnt-on sands and air holes on the surface of a casting piece are reduced. The adding amount of the resin is reduced to 0.8% from the original 1.2%, and the tensile strength is kept to 0.8 MPa, so that the probability of forming the air holes is greatly reduced. Moreover, a standard 8-shaped test block is made by resin sands, so that detection on a sand strength tester is carried out.
Description
Technical field
The invention belongs to resin sand casting field, be specifically related to a kind of high-intensity resin composition and method of making the same and application.
Background technology
Along with implementing of policies of reform and opening to the outside world, the factory of China and external co-production increases, and the foreign producer of many co-production all puts forward the requirement with self-hardening resin sand to castings production, otherwise cannot cooperate.Concerning domestic, based on exported product, also more and more higher to the requirement of casting quality.So develop under the new situation in this social production, under the promotion of resin sand heat abroad, application self-hardening resin sand is a revolution in formative technology to force the numerous founders authors of China to recognize, it is the important channel of improving foundry goods and mechanical product quality, being revitalize the only way that casting industry changes looks below, is the basic guarantee that engineering goods leap to international market.The fact shows that producing large foundry goods in multiple small lot with resin sand technique replacement clay mould drying sand is one of developing direction of domestic casting industry from now on.
Current foundry goods resin passes through to increase the addition of resin thus the intensity of raising resin, but gas forming amount thus improve, but the motor casting connection jaws place molding sand thinnest part that we produce only has 7mm, be easy to scab, in resin, add additive silane, iron oxide, dibatyl phithalate now, thus improve the intensity of resin, reduce the addition of resin.
Summary of the invention
Goal of the invention: the object of the invention is to for the deficiencies in the prior art, provides a kind of high-intensity resin composition and method of making the same and application.
Technical scheme: a kind of high-intensity resin composition, described composition is made up of furane resins, silane, iron oxide, dibatyl phithalate, sulfonic acid solid agent and sand, wherein to account for the mass percent of resin as follows for each component: silane 0.5%-2%, iron oxide 2%-7%, dibatyl phithalate 0.4%-1%, sulfonic acid solid agent 30%-50%, sand 50%-90%.
Wherein, described furane resins are self-hardening furan resin.
Wherein, the mass percent that described each component accounts for resin is as follows: silane 0.5%, iron oxide 7%, dibatyl phithalate 0.4%, sulfonic acid solid agent 49.4%, sand 90%.
A kind of preparation method of high-intensity resin composition, mixture is obtained after described furane resins, silane, iron oxide and dibatyl phithalate being mixed at normal temperatures and pressures by above-mentioned mass percent, sulfonic acid solid agent and sand will be mixed in said mixture again by puddle mixer, blending temperature controls at 0-50 DEG C, be cooled to normal temperature, finally obtain high-intensity resin composition.
Wherein, described blending temperature is 50 DEG C.
An application for high-intensity resin composition, is used for the preparation of resin sand in motor casting by described high-intensity resin composition.
Wherein, the performance parameter for each side of resin sand needs to investigate further, and such as surface stability, gas permeability, gas forming amount, elevated temperature strength, resin are in the addition etc. of curing agent.
Surface stability: weigh φ 50 × 50 sample after sclerosis in 24 hours W1; Then be placed on 14 mesh sieves and vibrate 2 minutes, then the W2 that weighs, then surface stability is: SSI=W2/W1 × 100%
Gas permeability: it and setting rate have nothing to do, relevant with granularmetric composition with the grain type of sand, particle is less, and granularity is overstepping the bounds of propriety loose, and containing differential, gas permeability is poorer more at most, and binding agent addition is many also affects gas permeability.
Gas forming amount: furane resins are organic binder bonds, molding sand gas forming amount is main relevant with addition with the composition of resin.The initiation amount of urea aldehyde is large, and the gas forming amount of furfuryl alcohol and formaldehyde is low.Addition is large, and the corresponding increase of gas forming amount and time of getting angry also extend, but disproportionate with the growth rate of getting angry.
Elevated temperature strength: refer to the intensity that style records under high temperature (as 900 DEG C) state.For organic system casting mold, ensure that casting mold withstands the thermal shock of metallic solution, be that before casting solidification, casting mold is unlikely to defeated and dispersed too early.Improve elevated temperature strength mainly through improving the ratio of furfuryl alcohol in resin.In addition, add the additives such as small amounts iron or boric acid in sand, or adopt the zircon sand of the little good heat resistance that expands, chrome ore also can improve calorific intensity.
The addition of resin and curing agent: along with resin amount increases, the whole intensity of furans sand will increase.General tensile strength should be greater than 8-10Kg/cm
2or compression strength is greater than 25-30Kg/cm
2.At this moment the size of type (core) should also be considered, the factors such as complexity and molten iron pressure head height, too high intensity is unnecessary, not only wastes expensive binding agent, and increase gas-forming property facilitates pore class defect, reduce the difficulty that collapsibility increases knockout knockout simultaneously.
Sulfonic acid solid agent: be applied to different temperatures, furan resin-sand under different humidity condition, the hardness of phenol resin sand molding and core making, not only setting rate is fast, and intensity is high, and can regulate setting rate, sand mold (core) collapsibility is good, different service time can be met, molding intensity, the formative technology of whole intensity.
Dibatyl phithalate is plasticizer.To various kinds of resin, there is very strong dissolving power.Being mainly used in polyvinyl chloride processing can give goods good flexibility.But volatility and water extractable are comparatively large, therefore goods poor durability, progressively should limit it and use.These product are excellent plasticities of celluloid, and gelling ability is strong.Good emollescence is had for cellulose nitrate coating.Stability, resistance to deflection, adherence and water proofing property are all excellent.In addition, these product also can be used as polyvinyl acetate, alkyd resins, ethyl cellulose and neoprene plasticizer, also can be used for manufacturing paint, bonding agent, artificial leather, printing-ink, safety glass, celluloid, dyestuff, pesticide, perfume solvent, fabric lubricant etc.
In sand in coating phenolic resin, add appropriate iron oxide additive and can play the raising thermoplasticity of compound and the heat shield effect of the endothermic reaction, significantly can alleviate the Thermal cracking tendency of sand in coating phenolic resin.In production reality, for effectively reducing or prevent vein or the joint flash defect of shell mould method foundry goods, the addition of iron oxide is to account for heavy 0.5% ~ 1.0% being advisable of sand.
Beneficial effect: by adding additive in resin, thus the intensity improving resin, and decrease the use amount of resin, decrease the scab of cast(ing) surface, pore.The addition adding rear resin has been reduced to 0.8% by original 1.2%, and intensity is constant, and maintenance tensile strength is 0.8MPa, and the probability that pore occurs also greatly reduces, and makes the figure of eight test block of standard, sand bond analyzer detects with resin sand.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1: a kind of high-intensity resin composition, described composition is made up of furane resins, silane, iron oxide, dibatyl phithalate, sulfonic acid solid agent and sand, wherein to account for the mass percent of resin as follows for each component: silane 0.5%, iron oxide 7%, dibatyl phithalate 0.4%, sulfonic acid solid agent 49.4%, sand 90%.
The preparation method of above-mentioned high-intensity resin composition is as follows, mixture is obtained after described furane resins, silane, iron oxide and dibatyl phithalate being mixed at normal temperatures and pressures by above-mentioned mass percent, sulfonic acid solid agent and sand will be mixed in said mixture again by puddle mixer, blending temperature controls at 10 DEG C, be cooled to normal temperature, finally obtain high-intensity resin composition.
The above-mentioned application of a kind of high-intensity resin composition in casting field, the performance of wherein said high-intensity resin composition RSI is as shown in table 1:
Table 1
| Title | Surface stability | Gas permeability | There is pore-free | With or without scab | Tensile strength | High temperature resistant degree |
| RSI | 95% | Well | Nothing | On a small quantity | 0.87MPa | 350℃ |
As can be seen from above-mentioned performance parameter, this resin combination RSI good stability, good permeability, does not produce pore, and scab generation is also few, and tensile strength reaches 0.87MP, and ability 350 DEG C of high temperature.
Embodiment 2:
A kind of high-intensity resin composition, described composition is made up of furane resins, silane, iron oxide, dibatyl phithalate, sulfonic acid solid agent and sand, wherein to account for the mass percent of resin as follows for each component: silane 1%, iron oxide 4.5%, dibatyl phithalate 0.7%, sulfonic acid solid agent 40%, sand 70%.
Wherein, described resin is self-hardening furan resin.
The preparation method of above-mentioned high-intensity resin composition is as follows, mixture is obtained after described furane resins, silane, iron oxide and dibatyl phithalate being mixed at normal temperatures and pressures by above-mentioned mass percent, sulfonic acid solid agent and sand will be mixed in said mixture again by puddle mixer, blending temperature controls at 20 DEG C, be cooled to normal temperature, finally obtain high-intensity resin composition.
The above-mentioned application of a kind of high-intensity resin composition in casting field, the performance of wherein said high-intensity resin composition RSII is as shown in table 2:
Table 2
| Title | Surface stability | Gas permeability | There is pore-free | With or without scab | Tensile strength | High temperature resistant degree |
| RSII | 98% | Well | Nothing | On a small quantity | 0.88MPa | 360℃ |
As can be seen from above-mentioned performance parameter, this resin combination RSII good stability, can reach 98% according to formulae discovery, good permeability, not produce pore, and scab generation is also few, and tensile strength reaches 0.88MP, and ability 360 DEG C of high temperature.
Embodiment 3:
A kind of high-intensity resin composition, it is characterized in that: described composition is made up of furane resins, silane, iron oxide, dibatyl phithalate, sulfonic acid solid agent and sand, wherein to account for the mass percent of resin as follows for each component: silane 2%, iron oxide 2%, dibatyl phithalate 1%, sulfonic acid solid agent 30%, sand 50%.
The preparation method of above-mentioned high-intensity resin composition is as follows, mixture is obtained after described furane resins, silane, iron oxide and dibatyl phithalate being mixed at normal temperatures and pressures by above-mentioned mass percent, sulfonic acid solid agent and sand will be mixed in said mixture again by puddle mixer, blending temperature controls at 50 DEG C, be cooled to normal temperature, finally obtain high-intensity resin composition.
The described application of a kind of high-intensity resin composition in casting field, the performance of wherein said high-intensity resin composition RSIII is as shown in table 3:
Table 3
| Title | Surface stability | Gas permeability | There is pore-free | With or without scab | Tensile strength | High temperature resistant degree |
| RSIII | 96% | Well | Nothing | On a small quantity | 0.86MPa | 350℃ |
As can be seen from above-mentioned performance parameter, this resin combination RSII good stability, can reach 96% according to formulae discovery, good permeability, not produce pore, and scab generation is also few, and tensile strength reaches 0.86MP, and ability 350 DEG C of high temperature.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a high-intensity resin composition, it is characterized in that: described composition is made up of self-hardening furan resin, silane, iron oxide, dibatyl phithalate, sulfonic acid solid agent and sand, wherein to account for the mass percent of resin as follows for each component: silane 0.5%-2%, iron oxide 2%-7%, dibatyl phithalate 0.4%-1%, sulfonic acid solid agent 30%-50%, sand 50%-90%.
2. according to a kind of high-intensity resin composition described in claim 1, it is characterized in that: the mass percent that described each component accounts for resin is as follows: silane 0.5%, iron oxide 7%, dibatyl phithalate 0.4%, sulfonic acid solid agent 49.4%, sand 90%.
3. the preparation method of a kind of high-intensity resin composition described in any one of claim 1-2, it is characterized in that: described furane resins, silane, iron oxide and dibatyl phithalate are obtained mixture by above-mentioned mass percent after normal temperature and pressure mixes, sulfonic acid solid agent and sand will be mixed in said mixture again by puddle mixer, blending temperature controls at 0-50 DEG C, be cooled to normal temperature, finally obtain high-intensity resin composition.
4. according to the preparation method of a kind of high-intensity resin composition described in claim 3, it is characterized in that: described blending temperature is 50 DEG C.
5. the application of a kind of high-intensity resin composition in casting field described in claim 1.
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| CN106001392A (en) * | 2016-05-30 | 2016-10-12 | 柳州市柳晶科技有限公司 | Inorganic precoated sand and production method thereof |
| CN112692226B (en) * | 2020-12-09 | 2022-08-30 | 南昌科勒有限公司 | Hot core box resin sand and resin sand core comprising same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1274625A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Wet film coating sand |
| CN101524737A (en) * | 2009-04-10 | 2009-09-09 | 苏州市兴业铸造材料有限公司 | Phenol urethane cold core box bond for nonferrous casting and preparation method thereof |
| CN102039365A (en) * | 2010-12-01 | 2011-05-04 | 沈阳工业大学 | Preparation method and hardening method for air hardening expandable polystyrene (EPS) emulsion binder for casting |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1274625A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Wet film coating sand |
| CN101524737A (en) * | 2009-04-10 | 2009-09-09 | 苏州市兴业铸造材料有限公司 | Phenol urethane cold core box bond for nonferrous casting and preparation method thereof |
| CN102039365A (en) * | 2010-12-01 | 2011-05-04 | 沈阳工业大学 | Preparation method and hardening method for air hardening expandable polystyrene (EPS) emulsion binder for casting |
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