CN104558466A - Preparation method of synthetic resin binder for casting molding (core) sand - Google Patents
Preparation method of synthetic resin binder for casting molding (core) sand Download PDFInfo
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- CN104558466A CN104558466A CN201310489172.5A CN201310489172A CN104558466A CN 104558466 A CN104558466 A CN 104558466A CN 201310489172 A CN201310489172 A CN 201310489172A CN 104558466 A CN104558466 A CN 104558466A
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Abstract
The invention discloses a preparation method of a synthetic resin binder for casting molding (core) sand. The binder comprises raw materials in parts by weight as follows: 5-40 parts of formaldehyde, 0-20 parts of phenol and 30-85 parts of furfuryl alcohol. The bending strength of the binder synthetized with cashew nut shell oil is generally higher than 4.2 MPa and is more than 25% higher than the bending strength, which is 3.3 MPa, of a common phenolic resin binder, the binder is used on casting sites, and the number of cracks of castings is decreased by more than 30%. The synthetic resin binder for the casting molding (core) sand is applied to casting production and can obviously reduce crack defects of the castings.
Description
Technical field
The invention belongs to casting technology field, be specifically related to a kind of preparation method of casting core sand synthetic resin adhesive.
Background technology
The used araldite of cast moulding (core) sand is with urea, formaldehyde, phenol and furfuryl alcohol for main raw material(s), under the effect of certain catalyst, through the compound of the HMW of polycondensation.The requirement of castings material and environmental protection is urea in synthetic resin, the consumption of formaldehyde and stupid phenol is subject to a definite limitation; Along with the high speed development of foundry industry, the continuous expansion of the expense of cast moulding (core) sand araldite, the supply of furfuryl alcohol becomes nervous trend gradually; Find excellent performance, the novel raw material of in liberal supply and moderate synthetic resin, be conducive to sustainable development and the supply of synthetic resin.
Summary of the invention
In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, a kind of preparation method of casting core sand synthetic resin adhesive is provided.
The preparation method of casting core sand synthetic resin adhesive provided by the invention, its technical scheme is: the raw material adopting following weight portion: 5 ~ 40 parts of cashew nut shell oils, 0 ~ 20 part of urea, 5 ~ 40 parts of formaldehyde, 0 ~ 20 part of phenol, 30 ~ 85 parts of furfuryl alcohols.
To be cashew nut shell liquid obtain through decarboxylation is refining industrial cashew nut shell oil, its main component is anacardol, anacardol is single phenol that a bit strip has a long-chain unsaturated alkyl, plays internally plasticized effect, so have excellent adhesive property with cashew nut oil modified synthetic resin.
The raw material composition of above-mentioned weight portion, by the difference of synthetic resin instructions for use, disposablely can add reaction, also can divide and add reaction several times.Different with the requirement of synthetic resin moisture according to the difference of concentration of formaldehyde used, thickening can be carried out to material system in production process, also can not carry out thickening.
The reactions steps preparing binding agent of the present invention generally can be divided into following several:
1. the raw material compositional system meeting above-mentioned weight portion carried out addition reaction after 2 hours under the alkali condition of PH > 7.5, polycondensation reaction is carried out 1.5 hours again under PH < 6 acid condition, adjust material system afterwards to react 1 hour under the alkali condition of PH > 7.5, the cooling of material system is stopped reacting and obtaining binding agent.
2. the raw material compositional system meeting above-mentioned weight portion carried out addition reaction after 2 hours under the alkali condition of PH > 7.5, polycondensation reaction 1 hour 20 minutes is carried out again under PH < 6 acid condition, finally at alkaline solution, pH value is adjusted to 6.5 ~ 7.5 scopes, obtains this binding agent.
3. the raw material compositional system meeting above-mentioned weight portion reacts under the alkali condition of PH > 7.5, when viscosity reaches 40 ~ 45mPas requirement, then with alkaline solution, pH value is adjusted to 6.5 ~ 7.5 scopes, obtains this binding agent.
The preparation method of casting core sand synthetic resin adhesive provided by the invention, its beneficial effect is: the use adding cashew nut shell oil in building-up process, not only expand synthetic resin raw material supply scope, and improve the casting serviceability of synthetic resin.The bending strength of the binding agent synthesized with cashew nut shell oil is generally at more than 4.2MPa, and comparatively phenolic resin binding agent 3.3MPa bending strength improves more than 25%, and through casting onsite application, casting crack quantity reduces more than 30%.Cast moulding (core) the sand araldite of this invention is used for Foundry Production, obviously can reduce the crack defect of foundry goods.
Detailed description of the invention
Below in conjunction with an embodiment, the preparation method of casting core sand synthetic resin adhesive provided by the invention is described in detail.
Embodiment
The preparation method of the casting core sand synthetic resin adhesive of the present embodiment, raw material form: cashew nut shell oil: 100Kg, formaldehyde (concentration 92%): 30Kg, urea: 26Kg, furfuryl alcohol: 300Kg.
Reactions steps:
Add cashew nut shell oil 100Kg, formaldehyde (concentration 92%) 30Kg, furfuryl alcohol 300Kg in reactor, start and stir, add urea 26Kg, after urea dissolves, regulate pH value to be 9.5 ~ 9.8 at alkaline solution, be warming up to 80 ± 2
0c measures material system viscosity after reacting 1 hour, and when viscosity reaches 40 ~ 45mPas, the cooling of material system is stopped reaction, and with acid solution, pH value is adjusted to 6.5 ~ 7.5 scopes, namely blowing obtains the preparation method of casting core sand synthetic resin adhesive.
Claims (1)
1. a preparation method for casting core sand synthetic resin adhesive, is characterized in that: the raw material adopting following weight portion: 5 ~ 40 parts of cashew nut shell oils, 0 ~ 20 part of urea, 5 ~ 40 parts of formaldehyde, 0 ~ 20 part of phenol, 30 ~ 85 parts of furfuryl alcohols; To be cashew nut shell liquid obtain through decarboxylation is refining industrial cashew nut shell oil, and its main component is anacardol; The raw material compositional system meeting above-mentioned weight portion carried out addition reaction after 2 hours under the alkali condition of PH > 7.5, polycondensation reaction 1.2-1.5 hour is carried out again under PH < 6 acid condition, adjust material system afterwards to react 1 hour under the alkali condition of PH6.5 ~ 7.5, viscosity reaches 40 ~ 45mPas, the cooling of material system is stopped reacting and obtaining binding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310489172.5A CN104558466A (en) | 2013-10-18 | 2013-10-18 | Preparation method of synthetic resin binder for casting molding (core) sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310489172.5A CN104558466A (en) | 2013-10-18 | 2013-10-18 | Preparation method of synthetic resin binder for casting molding (core) sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104558466A true CN104558466A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310489172.5A Pending CN104558466A (en) | 2013-10-18 | 2013-10-18 | Preparation method of synthetic resin binder for casting molding (core) sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104558466A (en) |
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2013
- 2013-10-18 CN CN201310489172.5A patent/CN104558466A/en active Pending
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |