CN102875756B - Method for producing self-hardening furan resin for casting with pentose compound instead of furfuryl alcohol - Google Patents
Method for producing self-hardening furan resin for casting with pentose compound instead of furfuryl alcohol Download PDFInfo
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Abstract
The invention relates to a method for producing self-hardening furan resin for casting, in particular to a method for producing self-hardening furan resin for casting by taking a pentose compound as a raw material to substitute for part of furfuryl alcohol. According to the method, 5-35 parts of pentose compound and 50-60 parts of furfuryl alcohol are used as raw materials combination to replace a large quantity of furfuryl alcohol required in the prior art, so that the using quantity of the furfuryl alcohol is reduced. Compared with the traditional method for producing furan resin, the method provided by the invention has the advantages that production cost is lowered, harm to environments is reduced, and the method is favorable to large scale production; and meanwhile, in the preparation process of the furan resin, an aldehyde and polyhydroxy structure in the molecule of the pentose compound is utilized to increase resin curing crosslinking points and facilitate the formation of a reticular structure in the curing process of the resin, the strength of resin sand is improved, and the content of free formaldehyde can be effectively reduced.
Description
Technical field
The present invention relates to a kind of preparation method cast with self-hardening furan resin, be specifically related to a kind of preparation method being raw material production casting self-hardening furan resin with pentose compound part replacement furfuryl alcohol.
Background technology
Furane resin refer to have the general name that the furfuryl alcohol of furan nucleus and furfural make the resene of raw material production, and it is cured as insoluble and not molten solid substance under strong acid effect, and kind has furfuryl alcohol resin, furfuryl resin, acetone-furfural resin, chaff ketone--formaldehyde resin etc.Furfuryl alcohol resin is that main body and formaldehyde condensation polymer form (modified product with the addition of urea again) by furfuryl alcohol, outward appearance is the liquid or solid of Vandyke brown to black, thermotolerance and water tolerance are all fine, chemical resistance is extremely strong, having excellent resistibility to acid, alkali, salt and organic solution, is excellent sanitas.Casting self-hardening furan resin is the one of furfuryl alcohol resin, referring at room temperature makes sand mold (core) harden by acid catalysis, and in the structure containing furan nucleus, have furfuryl alcohol, formaldehyde, urea and or the thermosetting resin of the synthesis such as phenol, be generally faint yellow to amber transparent or translucent uniform liquid.Casting self-hardening furan resin intensity is high, is the excellent binding agent such as timber, rubber, metal and pottery, also can be used for producing coating.An important use of casting self-hardening resin makes core binder in the casting technique of mechanical industry, is specially adapted to large-scale, large batch of machinofacture, as the production of automobile military project, oil engine, diesel engine, sewing machine etc.During binding agent for casting sand core, casting self-hardening resin has following characteristics: curing speed is fast, normal temperature strength is low, decomposition temperature is high; According to the carbon content of different foundry goods, the resin of different nitrogen content can be selected; Get angry little, hot strength is high, thermal expansivity is moderate, fragility is large, little, the water absorbability of pore tendency is large, be widely used as binding agent in industries such as timber, rubber, metal, potteries, also play an important role in mechanical industry.Especially add urea-modified after, can require to produce the furfuryl alcohol resin of different nitrogen content, to meet the requirement of cast steel, cast iron and other non-ferrous metals casting techniques according to difference.
In prior art, the synthesis technique of general conventional cast self-hardening furan resin is: in reactor, add formaldehyde (15-25 part), and start stirring for some time, then add part urea (5-8 part) and dissolve, and regulate pH to react certain hour in the basic conditions; Add a part of furfuryl alcohol (15-20 part) according to the requirement of the nitrogen content of required production resin again to react; First regulate pH to react for some time in the basic conditions after adding furfuryl alcohol, the pH value then adjusting material system is again that acidity is reacted; Add remaining part urea (1-3 part) subsequently to reduce the free formaldehyde in resin, again whole material system is dewatered under vacuum, and in the system after dehydration, add the furfuryl alcohol (40-75 part) of remaining part, stir, obtain required casting self-hardening furan resin product.
In recent years, along with the fast development of China's foundry industry, a large amount of employings of casting self-hardening furan resin sand technique, its demand is progressively increased, although its good casting property, but the price of raw material furfuryl alcohol remains on very high level in these several years always, and then cause the price of the furane resin produced also relatively high, this widespread use for furane resin serves certain restriction inhibition.At present, seek a kind of cheap furfuryl alcohol alternative materials production casting self-hardening furan resin and become foundry industry problem demanding prompt solution.
Summary of the invention
For this reason, what technical problem to be solved by this invention was casting self-hardening furan resin in prior art prepares the problem that a large amount of furfuryl alcohol of need of production consumption causes production cost higher, so provide a kind of with pentose compound Some substitute furfuryl alcohol production casting self-hardening furan resin to reduce the casting self-hardening furan resin preparation method of production cost.
Second technical problem to be solved by this invention is a kind of method preparing furane resin providing raw material sources new more widely.
For solving the problems of the technologies described above, pentose compound of the present invention substitutes the method for furfuryl alcohol production casting self-hardening furan resin, comprises the steps:
(1) in reactor, add formaldehyde 15-25 part, and 5-8 part urea stirs, and regulate pH to be that alkalescence is reacted;
(2) add 15-20 part furfuryl alcohol to react, and to adjust system pH be slightly acidic, control temperature of reaction 80-100 DEG C of reaction;
(3) add 1-3 part urea in the reactant again obtained in step (2), and to adjust material system pH be weakly alkaline, control temperature of reaction 70-85 DEG C, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant that step (3) obtains is dewatered, and add 5-35 part pentose compound and 35-40 part furfuryl alcohol, stir, obtain desired product;
Above number is parts by weight.
Described pentose compound comprises the mixture of one or more in wood sugar, pectinose, Xylitol, lyxose, ribose.
In described step (1), adjustment pH is weakly alkaline, preferably regulates pH to be 8.0-10.0.
In described step (2), adjustment pH is 2.5-5.5.
In described step (3), adjustment pH is 7.5-9.5.
In described step (4), described processed is carried out under vacuum.
In described step (4), reactant dewaters to water ratio lower than 20% by described processed.
In described step (1), described formaldehyde is formaldehyde solution or the polyoxymethylene solution of 37%.
In described step (2), regulating pH for slightly acidic with dilute acid solns such as the sulfuric acid of 5-25%, hydrochloric acid, oxalic acid, sulfonic acid, take oxalic acid as the best.
In described step (1) and (3), regulating pH for alkalescence with dilute acid solns such as sodium hydroxide, sodium carbonate, sodium bicarbonates, take sodium hydroxide as the best.
The invention also discloses a kind of casting self-hardening furan resin prepared by aforesaid method.
Technique scheme of the present invention has the following advantages compared to existing technology, 1, the technique replacing furfuryl alcohol production casting self-hardening furan resin with pentose compound of the present invention, expensive furfuryl alcohol is replaced with cheap pentose compound part, thus reduce the consumption of furfuryl alcohol, compared with the production of conventional furan resin, reduce production cost, and the hazardness of environment is reduced, be conducive to scale operation; 2, technology utilization pentose compound of the present invention participates in the building-up reactions of furane resin directly, simplify and be first cyclized into furfural by pentose, generate furfuryl alcohol by hydrogenation of furfural again, finally participate in by furfuryl alcohol the technique that reaction generates furane resin, saved production cost; 3, utilize in technique of the present invention in pentose compound molecule containing aldehyde radical and polyhydroxy structure, in the process preparing furane resin, add the cross-linking set of resin solidification, be conducive to resin and form reticulated structure in the curing process, improve the intensity of resin sand, in addition because pentose belongs to poly-hydroxy aldehyde, can also with free formaldehyde generation aldol reaction in reaction system, and then in being synthesized by urea-formaldehyde resin, unreacted formaldehyde consumes, thus reduce the content of free formaldehyde; 4, the pentose compound that directly extensively exists using occurring in nature of method of the present invention is as raw material production casting self-hardening furan resin, and the synthesis for furane resin provides a kind of raw material sources new way more widely; 5, the product obtained by technique of production casting self-hardening furan resin of the present invention, compared with product of the prior art, nitrogen content and free formaldehyde content all meet national standard, are applicable in required technique.
Embodiment
Embodiment 1
Starting material form:
Formaldehyde 250Kg (25 parts), urea 100Kg(10 part), furfuryl alcohol 550Kg(55 part) and, wood sugar 350Kg(35 part).
Substitute the method for furfuryl alcohol production casting self-hardening furan resin described in the present embodiment with pentose compound, comprise the steps:
(1) in reactor, add 25 parts, the formaldehyde that concentration is 37%, and 8 parts of urea stir, after urea dissolves, regulate pH 9.0-9.2 to carry out reaction 1h with sodium hydroxide solution;
(2) add 20 parts of furfuryl alcohols subsequently to react, and adjust system pH for 2.5-3.5 with the sulphuric acid soln of 10%, control temperature of reaction 90-95 DEG C of reaction 1.5h;
(3) add 2 parts of urea in the reactant again obtained in step (2), and with sodium carbonate solution adjustment material system pH for 7.8-8.0, control to answer temperature 70-75 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add 35 parts of wood sugars and 35 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 1100Kg.
Embodiment 2
Starting material form:
Formaldehyde (concentration 37%) 200Kg(20 part), urea 110Kg(11 part), furfuryl alcohol 500 Kg(50 part) and, mixture 300 Kg(30 part of pectinose and Xylitol).
Substitute the method for furfuryl alcohol production casting self-hardening furan resin described in the present embodiment with pentose compound, comprise the steps:
(1) in reactor, add 20 parts, the formaldehyde that concentration is 37%, and 8 parts of urea stir, after urea dissolves, regulate pH 9.2-9.6 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 15 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.0-4.5 with the hydrochloric acid soln of 20%, control temperature of reaction 95-100 DEG C of reaction 1.5h;
(3) add 3 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 8.0-8.2, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add mixture and 35 parts of furfuryl alcohols of 30 portions of pectinoses and Xylitol subsequently, stir, namely blowing obtains desired product about 1050Kg.
Embodiment 3
Starting material form:
Polyoxymethylene solution (concentration 37%) 150Kg(15 part), urea 90Kg(9 part), furfuryl alcohol 550Kg(55 part) and, Xylitol 200 Kg(20 part).
Substitute the method for furfuryl alcohol production casting self-hardening furan resin described in the present embodiment with pentose compound, comprise the steps:
(1) in reactor, add the polyoxymethylene solution 20 parts that concentration is 37%, and 6 parts of urea stir, after urea dissolves, regulate pH 9.6-10.0 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 15 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.8-5.0 with the oxalic acid solution of 25%, control temperature of reaction 85-90 DEG C of reaction 1.5h;
(3) add 3 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 7.5-8.5, control temperature of reaction 80-85 DEG C of reaction after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add 20 parts of Xylitols and 40 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 960Kg.
Embodiment 4
Starting material form:
Formaldehyde (concentration 37%) 220Kg(22 part), urea 60Kg(6 part), furfuryl alcohol 600Kg(60 part) and, mixture 50 Kg(5 part of lyxose and wood sugar).
Substitute the method for furfuryl alcohol production casting self-hardening furan resin described in the present embodiment with pentose compound, comprise the steps:
(1) in reactor, add 22 parts, the formaldehyde that concentration is 37%, and 5 parts of urea stir, after urea dissolves, regulate pH 8.0-8.5 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 20 parts of furfuryl alcohols subsequently to react, and adjust system pH for 3.5-4.0 with the sulfonic acid solutions of 5%, control temperature of reaction 80-85 DEG C of reaction 1.5h;
(3) add 1 part of urea in the reactant again obtained in step (2), and with dilute solution of sodium bicarbonate adjustment material system pH for 8.5-9.0, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add mixture and 40 parts of furfuryl alcohols of 5 portions of lyxoses and wood sugar subsequently, stir, namely blowing obtains desired product about 900Kg.
Embodiment 5
Starting material form:
Formaldehyde (concentration 37%) 170Kg(17 part), urea 80Kg(8 part), furfuryl alcohol 560Kg(56 part) and, ribose 100Kg(10 part).
Substitute the method for furfuryl alcohol production casting self-hardening furan resin described in the present embodiment with pentose, comprise the steps:
(1) in reactor, add 17 parts, the formaldehyde that concentration is 37%, and 6 parts of urea stir, after urea dissolves, regulate pH 8.5-9.0 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 18 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.0-4.2 with the oxalic acid solution of 25%, control temperature of reaction 90-95 DEG C of reaction 1.5h;
(3) add 2 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 7.8-8.0, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add 10 parts of ribose and 38 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 1000Kg.
Comparative example 1
Starting material form:
Formaldehyde (concentration 37%) 250Kg(25 part), urea 100Kg(10 part), furfuryl alcohol 900Kg(90 part).
With the method for art methods production casting self-hardening furan resin described in the present embodiment, comprise the steps:
(1) in reactor, add 25 parts, the formaldehyde that concentration is 37%, and 8 parts of urea stir, after urea dissolves, regulate pH 9.0-9.2 to carry out reaction 1h with sodium hydroxide solution;
(2) add 20 parts of furfuryl alcohols subsequently to react, and adjust system pH for 2.5-3.5 with the sulphuric acid soln of 10%, control temperature of reaction 90-95 DEG C of reaction 1.5h;
(3) add 2 parts of urea in the reactant again obtained in step (2), and with sodium carbonate solution adjustment material system pH for 7.8-8.0, control to answer temperature 70-75 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add remaining 70 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 1100Kg.
Comparative example 2
Starting material form:
Formaldehyde (concentration 37%) 200Kg(20 part), urea 110Kg(11 part), furfuryl alcohol 800Kg(80 part).
With the method for art methods production casting self-hardening furan resin described in the present embodiment, comprise the steps:
(1) in reactor, add 20 parts, the formaldehyde that concentration is 37%, and 8 parts of urea stir, after urea dissolves, regulate pH 9.2-9.6 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 15 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.0-4.5 with the hydrochloric acid soln of 20%, control temperature of reaction 95-100 DEG C of reaction 1.5h;
(3) add 3 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 8.0-8.2, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add remaining 65 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 1050Kg.
Comparative example 3
Starting material form:
Polyoxymethylene solution (concentration 37%) 150Kg(15 part), urea 90Kg(9 part), furfuryl alcohol 750Kg(75 part).
With the method for art methods production casting self-hardening furan resin described in the present embodiment, comprise the steps:
(1) in reactor, add the polyoxymethylene solution 20 parts that concentration is 37%, and 6 parts of urea stir, after urea dissolves, regulate pH9.6-10.0 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 15 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.8-5.0 with the hydrochloric acid soln of 20%, control temperature of reaction 85-90 DEG C of reaction 1.5h;
(3) add 3 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 7.5-8.5, control to answer temperature 80-85 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add remaining 60 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 960Kg.
Comparative example 4
Starting material form:
Formaldehyde (concentration 37%) 220Kg(22 part), urea 60Kg(6 part), furfuryl alcohol 650Kg(65 part).
With the method for art methods production casting self-hardening furan resin described in the present embodiment, comprise the steps:
(1) in reactor, add 22 parts, the formaldehyde that concentration is 37%, and 5 parts of urea stir, after urea dissolves, regulate pH 8.0-8.5 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 20 parts of furfuryl alcohols subsequently to react, and adjust system pH for 3.5-4.0 with the sulfonic acid solutions of 5%, control temperature of reaction 80-85 DEG C of reaction 1.5h;
(3) add 1 part of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 8.5-9.0, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add remaining 45 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 900Kg.
Comparative example 5
Starting material form:
Formaldehyde (concentration 37%) 170Kg(17 part), urea 80Kg(8 part), furfuryl alcohol 660Kg(66 part).
With the method for art methods production casting self-hardening furan resin described in the present embodiment, comprise the steps:
(1) in reactor, add 17 parts, the formaldehyde that concentration is 37%, and 6 parts of urea stir, after urea dissolves, regulate pH 8.5-9.0 with dilute solution of sodium bicarbonate and be warming up to 85 DEG C and carry out reaction 1h;
(2) add 18 parts of furfuryl alcohols subsequently to react, and adjust system pH for 4.0-4.2 with the hydrochloric acid soln of 20%, control temperature of reaction 90-95 DEG C of reaction 1.5h;
(3) add 2 parts of urea in the reactant again obtained in step (2), and with sodium carbonate dilute solution adjustment material system pH for 7.8-8.0, control to answer temperature 75-80 DEG C to react after 1 hour, then system is cooled to 45-50 DEG C and stopped reaction;
(4) dewatered under vacuum by the reactant that step (3) obtains and carry out dewatering to water ratio lower than 20%, add remaining 48 parts of furfuryl alcohols subsequently, stir, namely blowing obtains desired product about 1000Kg.
More than synthesize the index comparing result of furane resin in table 1.
The analytical procedure of nitrogen content, free formaldehyde and intensity: perform by JB/T7526-2008 " casting self-hardening furan resin ".
The index determining result of table 1 embodiment 1-5 and comparative example 1-5
| Project | Nitrogen content (%) | Free formaldehyde (%) | Normal temperature tension is intensity (MPa) just | The whole intensity (MPa) of normal temperature tension |
| Embodiment 1 | 3.537 | 0.268 | 0.60 | 1.71 |
| Embodiment 2 | 3.513 | 0.271 | 0.56 | 1.65 |
| Embodiment 3 | 3.690 | 0.265 | 0.64 | 1.68 |
| Embodiment 4 | 3.491 | 0.266 | 0.68 | 1.75 |
| Embodiment 5 | 3.519 | 0.285 | 0.58 | 1.72 |
| Comparative example 1 | 3. 592 | 0.274 | 0.56 | 1.63 |
| Comparative example 2 | 3.560 | 0.219 | 0.60 | 1.59 |
| Comparative example 3 | 3.639 | 0.261 | 0.58 | 1.65 |
| Comparative example 4 | 3.513 | 0.280 | 0.62 | 1.60 |
| Comparative example 5 | 3.586 | 0.268 | 0.56 | 1.66 |
As can be seen from the above results, with of the present invention with compared with pentose compound part replace furfuryl alcohol to produce furane resin that the furane resin that obtain and prior art prepare, its nitrogen content performance, normal temperature tension just intensity and the whole intensity of normal temperature tension all suitable with prior art index, and the free formaldehyde content of whole handicraft product is also suitable with prior art, visible method of the present invention goes for preparation production casting self-hardening furan resin completely, and effectively reduces process costs.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (7)
1. pentose compound substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that, comprises the steps:
(1) in reactor, add formaldehyde 15-25 part, and 5-8 part urea stirs, and regulate pH to be that alkalescence is reacted;
(2) add 15-20 part furfuryl alcohol to react, and to adjust system pH be 2.5-5.5, control temperature of reaction 80-100 DEG C of reaction;
(3) add 1-3 part urea in the reactant again obtained in step (2), and to adjust material system pH be 7.5-9.5, control temperature of reaction 70-85 DEG C, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant that step (3) obtains is dewatered, and add 5-35 part pentose compound and 35-40 part furfuryl alcohol, stir, obtain desired product;
Described pentose compound comprises the mixture of one or more in wood sugar, pectinose, lyxose, ribose;
Above number is parts by weight.
2. pentose compound according to claim 1 substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that:
In described step (1), adjustment pH is 8.0-10.0.
3. pentose compound according to claim 1 and 2 substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that:
In described step (4), described processed is carried out under vacuum.
4. pentose compound according to claim 3 substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that:
In described step (4), reactant dewaters to water ratio lower than 20% by described processed.
5. pentose compound according to claim 1 and 2 substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that:
In described step (2), regulate pH for 2.5-5.5 with the sulfuric acid of 5-25%, hydrochloric acid, oxalic acid, sulfonic acid dilute acid soln.
6. pentose compound according to claim 1 and 2 substitutes the method for furfuryl alcohol production casting self-hardening furan resin, it is characterized in that:
In described step (1) and (3), regulate pH for alkalescence with sodium hydroxide, sodium carbonate, sodium bicarbonate dilute alkaline soln.
7. according to the casting self-hardening furan resin that the arbitrary described method of claim 1-6 prepares.
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| CN104387543B (en) * | 2014-12-10 | 2017-06-23 | 济南圣泉集团股份有限公司 | The method for preparing lignin modification furane resins |
| CN109957082A (en) * | 2017-12-25 | 2019-07-02 | 宜兴市兴南复合材料厂有限公司 | A kind of preparation method of furan resin for casting |
| CN114933686A (en) * | 2022-06-22 | 2022-08-23 | 山东怡泰恒环保材料有限公司 | Preparation method of high-performance dehydration-prevention self-hardening furan resin |
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| EP0540837A1 (en) * | 1991-11-07 | 1993-05-12 | Bakelite AG | Lignin modified binder |
| CN1324878A (en) * | 2001-06-04 | 2001-12-05 | 王进兴 | Ecological self-hardening furan resin without aldehyde and phenol |
| CN101199981A (en) * | 2007-11-28 | 2008-06-18 | 济南圣泉集团股份有限公司 | Easy collapsibility furan resin for casting and preparing process thereof |
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Denomination of invention: Method for preparing self-solidified furan resin for casting by amyl saccharide compound instead of furfuryl alcohol Effective date of registration: 20160302 Granted publication date: 20150114 Pledgee: Industrial Commercial Bank of China Ltd Zhangqiu branch Pledgor: Shengquan Group Co., Ltd., Ji'nan City Registration number: 2016990000130 |
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