CN102807661B - Method for preparing self-hardening furan resin for casting and mother liquor - Google Patents
Method for preparing self-hardening furan resin for casting and mother liquor Download PDFInfo
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- CN102807661B CN102807661B CN201210255159.9A CN201210255159A CN102807661B CN 102807661 B CN102807661 B CN 102807661B CN 201210255159 A CN201210255159 A CN 201210255159A CN 102807661 B CN102807661 B CN 102807661B
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- furan resin
- mother liquor
- hardening furan
- furfuryl alcohol
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- 239000007849 furan resin Substances 0.000 title claims abstract description 86
- 239000012452 mother liquor Substances 0.000 title claims abstract description 39
- 238000005266 casting Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 171
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 42
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000004202 carbamide Substances 0.000 claims abstract description 40
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 18
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 63
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 18
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 17
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- 239000012745 toughening agent Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 235000021050 feed intake Nutrition 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 44
- 239000011347 resin Substances 0.000 abstract description 29
- 229920005989 resin Polymers 0.000 abstract description 29
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 5
- 238000006068 polycondensation reaction Methods 0.000 abstract description 4
- 238000007259 addition reaction Methods 0.000 abstract 1
- 239000003623 enhancer Substances 0.000 abstract 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 16
- 238000003756 stirring Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- SVAVYEPUOUCCCC-UHFFFAOYSA-N O1C=CC=C1.[N] Chemical compound O1C=CC=C1.[N] SVAVYEPUOUCCCC-UHFFFAOYSA-N 0.000 description 3
- 150000001299 aldehydes Chemical class 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical group C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 238000007171 acid catalysis Methods 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a method for preparing a self-hardening furan resin for casting and mother liquor. Acetone, phenol, solid formaldehyde, urea and furfuryl alcohol are used as raw materials to be subjected to an addition reaction, a polycondensation reaction and other steps to prepare the furan resin mother liquor. The mother liquor and the furfuryl alcohol with substantially adjustable amount are matched with an enhancer to be stirred conventionally to obtain the self-hardening furan resin for casting. According to the preparation method of the self-hardening furan resin for casting, the preparation process is quick and simple, the production efficiency is high, the labor intensity is low, the furfuryl alcohol content of the resin has strong controllability and wider adjustment range, and is suitable for preparing industrially applied high furan resins, medium furan resins and low furan resins, and thus the method is suitable for industrial popularization and application.
Description
Technical field
The present invention relates to a kind of self-hardening furan resin mother liquor and the casting preparation method of self-hardening furan resin, belong to resin material preparing technical field.
Background technology
Furane resin are the thermosetting resins that contain furan nucleus in a kind of structure, made by furfuryl alcohol and phenol, urea or various aldehyde modification furfuryl alcohol, casting is exactly a class wherein with self-hardening furan resin, and generally casting is faint yellow to brown transparent or semitransparent uniform liquid with self-hardening furan resin.Casting at room temperature can make sand mold (core) sclerosis by acid catalysis with self-hardening furan resin, be the class binding agent that casting industry is the most frequently used, application quantity is maximum, be characterized in that moulding (core) is simple, sand mold (core) collapsibility is good, regenerating used reclamation rate is high, resin sand intensity is high, smell is little., mainly there is the series of problems such as furfuryl alcohol add-on is high, production efficiency is low, energy consumption is large, secondary pollution in the preparation of self-hardening furan resin for casting at present.
CN101423594A discloses a kind of preparation method without nitrogen furan resin, adopting formaldehyde, phenol, furfuryl alcohol, properties-correcting agent and toughener is that raw material is prepared furane resin, and that preparation process comprises is reinforced, heat temperature raising, dehydration, synthetic, discharging and packing are put several key steps in storage.In this preparation method, furfuryl alcohol consumption is 89～93%, preparation-obtained furane resin are high furane resin (furfuryl alcohol content is greater than 80%), but can not, for the preparation of middle furane resin (furfuryl alcohol content is 60～80%) and low furane resin (furfuryl alcohol content is less than 60% and is greater than 40%), be difficult to obtain as required the furane resin of different furfuryl alcohol content; And furfuryl alcohol need to be in heat temperature raising, synthetic and discharging adding in batches, can cause like this furfuryl alcohol add-on higher, the efficiency of producing is exerted an influence; And building-up process need dehydration, easily cause secondary pollution.
Summary of the invention
The object of this invention is to provide a kind of self-hardening furan resin mother liquor, for producing fast as required the furane resin of different furfuryl alcohol content, to meet the needs of actual production.Another object of the present invention is to utilize the method for self-hardening furan resin for the casting of the different furfuryl alcohol content of self-hardening furan resin mother liquor production rapidly and efficiently, to enhance productivity, to reduce the controllability of secondary pollution, reduction labour intensity and production simultaneously.
In order to realize above object, the technical scheme that self-hardening furan resin mother liquor of the present invention adopts is: a kind of self-hardening furan resin mother liquor, and the acetone 10～25%, phenol 15～30%, solid formaldehyde 10～25%, urea 0.5～25%, furfuryl alcohol 25～50% of weight percent of take is prepared from as main raw material adopts following methods:
1) by the urea of the acetone of composition of raw materials amount, phenol, solid formaldehyde and part amount, feed intake, evenly mix, adjusting pH is 7.0～9.0, at 70～100 ℃ of temperature, reacts 1～3 hour;
2) add 25～50% furfuryl alcohol, adjusting pH is 4.0～6.0, at 80～110 ℃ of temperature, reacts 1.5～3.5 hours;
3) adjusting pH is 7.0～8.0, adds the urea of remaining amount, at 80～90 ℃ of temperature, reacts 0.5～1 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
As further improvement, in self-hardening furan resin mother liquor preparation method, adopt acid or alkali to adjust pH value.As the described acid of selection of optimizing, be phosphoric acid, described alkali is sodium hydroxide.
As further improvement, the urea of part amount accounts for 0～80% of urea total amount described in step 1).
As further improvement, step 2) described in add that to adjust system temperature before furfuryl alcohol be below 80 ℃.
The present invention casts the technical scheme that the preparation method with self-hardening furan resin adopts: a kind of casting self-hardening furan resin preparation method who adopts self-hardening furan resin mother liquor, the self-hardening furan resin mother liquor 20～80% of weight percent, furfuryl alcohol 20～80% and toughener 0.1～0.5% are stirred at normal temperatures, can obtain casting self-hardening furan resin.
As further optimized choice, described toughener is silane coupling agent, specifically can select silane coupling agent KH 550 or silane coupling agent KH 602.
The application's self-hardening furan resin mother liquor, adopts acetone, phenol, (trioxymethylene, has another name called 1 to solid formaldehyde, 3,5-trioxane) and urea be that raw material carries out addition, polycondensation and generates prepolymer, wherein acetone low price, can significantly reduce costs; Phenol is more conventional, is mainly used in improving the high-temperature behavior of resin; Solid formaldehyde replaces traditional liquid formaldehyde, and price is lower, without dehydration, and environmental protection more; The effect of urea has two: one, can generate urea-formaldehyde resin with formaldehyde reaction, then to add furfuryl alcohol polycondensation is below urea aldehyde furane resin; Its two, in the polycondensation later stage, add urea to remove free formaldehyde (utilizing the easily feature of reaction of urea and formaldehyde), play aldehydes removal effect.The self-hardening furan resin mother liquor that the present invention makes can stir and make casting self-hardening furan resin with furfuryl alcohol and toughener under normal temperature condition, and fast and simple, production efficiency is high, non-secondary pollution, labour intensity are low for preparation process.
The preparation technology of casting use self-hardening furan resin of the present invention as shown in Figure 1, in preparation process, the weight ratio of mother liquor and furfuryl alcohol is between 0.25～4, the part by weight of adjusting mother liquor and furfuryl alcohol, can obtain furfuryl alcohol content at 40% self-hardening furan resin to more than 80% different furfuryl alcohol content.Casting of the present invention self-hardening furan resin preparation method, compare CN101423594A patent, the controllability of furfuryl alcohol content and nitrogen content is strong, setting range is wider, the high furane resin, middle furane resin and the low furane resin that are applicable to the industrial application of preparation, also can prepare without nitrogen furan resin (can be considered without nitrogen furan resin according to JB/T 7526-2008 regulation nitrogen content≤0.5%), be applicable to carrying out industrial application.
Accompanying drawing explanation
Fig. 1 is that the present invention casts the process flow sheet by self-hardening furan resin preparation method.
Embodiment
embodiment 1
The self-hardening furan resin mother liquor of the present embodiment, adopting acetone 10%, phenol 18%, solid formaldehyde 18%, urea 4%, the furfuryl alcohol 50% of weight percent is main raw material preparation, concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 10% acetone, 18% phenol, 18% solid formaldehyde and 2% urea (urea total amount 50%), adopting sodium hydroxide to adjust pH is 7.0, at 70 ℃ of temperature, reacts 1 hour;
2) treat that system is cooled to 80 ℃ and adds below 50% furfuryl alcohol, with phosphoric acid, adjusting pH is 4.0, at 80 ℃ of temperature, reacts 1.5 hours;
3) with sodium hydroxide, adjusting pH is 7.0, adds 2% remaining urea, at 80 ℃ of temperature, reacts 0.5 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
The casting of the present embodiment is adopted with the following method with self-hardening furan resin, adopting self-hardening furan resin mother liquor 40%, furfuryl alcohol 59.8% and silane coupling agent (specifically the selecting KH 550) 0.2% that the present embodiment prepares is raw material mixing, stir at normal temperatures, can obtain casting self-hardening furan resin.Casting prepared by the present embodiment is 80% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to high furane resin.
embodiment 2
The self-hardening furan resin mother liquor of the present embodiment, adopting acetone 16%, phenol 30%, solid formaldehyde 13%, urea 0.5%, the furfuryl alcohol 40.5% of weight percent is main raw material preparation, concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 16% acetone, 30% phenol and 13% solid formaldehyde, adopting sodium hydroxide to adjust pH is 7.5, at 80 ℃ of temperature, reacts 1.8 hours;
2) treat that system is cooled to 80 ℃ and adds below 40.5% furfuryl alcohol, with phosphoric acid, adjusting pH is 5.0, at 95 ℃ of temperature, reacts 2 hours;
3) with sodium hydroxide, adjusting pH is 7.0, adds 0.5% urea, at 80 ℃ of temperature, reacts 0.5 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
The casting of the present embodiment is adopted with the following method with self-hardening furan resin, adopting self-hardening furan resin mother liquor 20%, furfuryl alcohol 79.7% and silane coupling agent (specifically the selecting KH 602) 0.3% that the present embodiment prepares is raw material mixing, stir at normal temperatures, can obtain casting self-hardening furan resin.Casting prepared by the present embodiment is 88% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to high furane resin.
embodiment 3
The self-hardening furan resin mother liquor of the present embodiment, adopting acetone 12%, phenol 16%, solid formaldehyde 25%, urea 12%, the furfuryl alcohol 35% of weight percent is main raw material preparation, concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 12% acetone, 16% phenol, 25% solid formaldehyde and 9% urea (account for urea total amount 75%), adopting sodium hydroxide to adjust pH is 8.0, at 90 ℃ of temperature, reacts 1～3 hour;
2) treat that system is cooled to 80 ℃ and adds below 35% furfuryl alcohol, with phosphoric acid, adjusting pH is 4.5, at 100 ℃ of temperature, reacts 3 hours;
3) with sodium hydroxide, adjusting pH is 7.5, adds 3% remaining urea, at 85 ℃ of temperature, reacts 0.8 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
The casting of the present embodiment is adopted with the following method with self-hardening furan resin, adopting self-hardening furan resin mother liquor 79.6%, furfuryl alcohol 20% and silane coupling agent (specifically the selecting KH 602) 0.4% that the present embodiment prepares is raw material mixing, stir at normal temperatures, can obtain casting self-hardening furan resin.Casting prepared by the present embodiment is 48% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to low furane resin.
embodiment 4
The self-hardening furan resin mother liquor of the present embodiment, adopting acetone 25%, phenol 15%, solid formaldehyde 10%, urea 25%, the furfuryl alcohol 25% of weight percent is main raw material preparation, concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 25% acetone, 15% phenol, 10% solid formaldehyde and 20% urea (account for urea total amount 80%), adopting sodium hydroxide to adjust pH is 9.0, at 100 ℃ of temperature, reacts 3 hours;
2) treat that system is cooled to 80 ℃ and adds below 25% furfuryl alcohol, with phosphoric acid, adjusting pH is 6.0, at 110 ℃ of temperature, reacts 3.5 hours;
3) with sodium hydroxide, adjusting pH is 8.0, adds 5% remaining urea, at 90 ℃ of temperature, reacts 1 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
The casting of the present embodiment is adopted with the following method with self-hardening furan resin, adopting self-hardening furan resin mother liquor 45%, furfuryl alcohol 54.8% and silane coupling agent (specifically the selecting KH 550) 0.2% that the present embodiment prepares is raw material mixing, stir at normal temperatures, can obtain casting self-hardening furan resin.Casting prepared by the present embodiment is 66% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to middle furane resin.
comparative example 1
The self-hardening furan resin finished product of this comparative example, adopting acetone 4%, phenol 7.2%, solid formaldehyde 7.2%, urea 1.6%, furfuryl alcohol 79.8%, silane coupling agent (specifically the selecting KH 550) 0.2% of weight percent is main raw material preparation, and concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 4% acetone, 7.2% phenol, 7.2% solid formaldehyde and 0.8% urea, adopting sodium hydroxide to adjust pH is 7.0, at 70 ℃ of temperature, reacts 1 hour;
2) treat that system is cooled to 80 ℃ and adds below 79.8% furfuryl alcohol, with phosphoric acid, adjusting pH is 4.0, at 80 ℃ of temperature, reacts 1.5 hours;
3) with sodium hydroxide, adjusting pH is 7.0, adds 0.8% remaining urea, at 80 ℃ of temperature, reacts 0.5 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin below, add 0.2% silane coupling agent to stir and be finished product.
This comparative example is the comparative example of embodiment 1, belongs to conventional cast self-hardening furan resin preparation method.Casting prepared by this comparative example is 80% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to high furane resin.
comparative example 2
The self-hardening furan resin finished product of this comparative example, adopting acetone 9.55%, phenol 12.74%, solid formaldehyde 19.9%, urea 9.55%, furfuryl alcohol 47.86%, silane coupling agent (specifically the selecting KH 602) 0.4% of weight percent is main raw material preparation, and concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 9.55% acetone, 12.74% phenol, 19.9% solid formaldehyde and 7.16% urea, adopting sodium hydroxide to adjust pH is 8.0, at 90 ℃ of temperature, reacts 1～3 hour;
2) treat that system is cooled to 80 ℃ and adds below 47.86% furfuryl alcohol, with phosphoric acid, adjusting pH is 4.5, at 100 ℃ of temperature, reacts 3 hours;
3) with sodium hydroxide, adjusting pH is 7.5, adds 1.84% remaining urea, at 85 ℃ of temperature, reacts 0.8 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin below, add 0.4% silane coupling agent to stir and be finished product.
This comparative example is the comparative example of embodiment 3, belongs to conventional cast self-hardening furan resin preparation method.Casting prepared by this comparative example is 48% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to low furane resin.
comparative example 3
The self-hardening furan resin finished product of this comparative example, adopting acetone 11.25%, phenol 6.75%, solid formaldehyde 4.5%, urea 11.25%, furfuryl alcohol 66.05%, silane coupling agent (specifically the selecting KH 550) 0.2% of weight percent is main raw material preparation, and concrete preparation method is as follows:
Adopt preparation with the following method:
1) in reactor, add 11.25% acetone, 6.75% phenol, 4.5% solid formaldehyde and 9% urea, adopting sodium hydroxide to adjust pH is 9.0, at 100 ℃ of temperature, reacts 3 hours;
2) treat that system is cooled to 80 ℃ and adds below 66.05% furfuryl alcohol, with phosphoric acid, adjusting pH is 6.0, at 110 ℃ of temperature, reacts 3.5 hours;
3) with sodium hydroxide, adjusting pH is 8.0, adds 2.25% remaining urea, at 90 ℃ of temperature, reacts 1 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin below, add 0.2% silane coupling agent to stir and be finished product.
This comparative example is the comparative example of embodiment 4, belongs to conventional cast self-hardening furan resin preparation method.Casting prepared by this comparative example is 66% left and right with the furfuryl alcohol content of self-hardening furan resin, belongs to middle furane resin.
Reference standard JB/T 7526-2008 carries out contrast experiment, and result is as table 1:
Table 1 embodiment and comparative example comparison of test results
。
As can be seen from Table 1, adopt the prepared self-hardening furan resin of preparation method of the present invention, furfuryl alcohol content has covered high furane resin, middle furane resin and low furane resin, and the performance of the furane resin of preparation is basic identical with the furane resin that adopt ordinary method to prepare.
Claims (9)
1. a self-hardening furan resin mother liquor, is characterized in that: acetone 10～25%, phenol 15～30%, solid formaldehyde 10～25%, urea 0.5～25%, the furfuryl alcohol 25～50% of weight percent of take is prepared from as main raw material adopts following methods:
1) by the urea of the acetone of composition of raw materials amount, phenol, solid formaldehyde and part amount, feed intake, evenly mix, adjusting pH is 7.0～9.0, at 70～100 ℃ of temperature, reacts 1～3 hour;
2) add 25～50% furfuryl alcohol, adjusting pH is 4.0～6.0, at 80～110 ℃ of temperature, reacts 1.5～3.5 hours;
3) adjusting pH is 7.0～8.0, adds the urea of remaining amount, at 80～90 ℃ of temperature, reacts 0.5～1 hour;
4) be cooled to 40 ℃ and can obtain self-hardening furan resin mother liquor below.
2. self-hardening furan resin mother liquor according to claim 1, is characterized in that: adopt acid or alkali to adjust pH value.
3. self-hardening furan resin mother liquor according to claim 2, is characterized in that: described acid is phosphoric acid.
4. self-hardening furan resin mother liquor according to claim 2, is characterized in that: described alkali is sodium hydroxide.
5. self-hardening furan resin mother liquor according to claim 1, is characterized in that: described in step 1), the urea of part amount accounts for 50～80% of urea total amount.
6. self-hardening furan resin mother liquor according to claim 1, is characterized in that: step 2) described in add that to adjust system temperature before furfuryl alcohol be below 80 ℃.
7. one kind adopts mother liquor as claimed in claim 1 to prepare the method for self-hardening furan resin for casting, it is characterized in that: the self-hardening furan resin mother liquor 20～79.6% of weight percent, furfuryl alcohol 20～79.7% and toughener 0.1～0.5% are stirred at normal temperatures, can obtain casting self-hardening furan resin.
8. prepare according to claim 7 the method for self-hardening furan resin for casting, it is characterized in that: described toughener is silane coupling agent.
9. prepare according to claim 8 the method for self-hardening furan resin for casting, it is characterized in that: described silane coupling agent is selected Silane coupling agent KH550 or silane coupling agent KH602.
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| CN107880232B (en) * | 2017-12-19 | 2020-04-28 | 广东省铸力铸材科技有限公司 | Special furan resin for additive manufacturing molding sand and preparation method |
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| CN102807661A (en) | 2012-12-05 |
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