CN102887984B - Method for preparing self-solidified furan resin for casting by amyl saccharide compound instead of furfuryl alcohol - Google Patents
Method for preparing self-solidified furan resin for casting by amyl saccharide compound instead of furfuryl alcohol Download PDFInfo
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Abstract
The invention relates to a preparation method of self-solidified furan resin for casting, and particularly relates to a preparation method for preparing the self-solidified furan resin for casting by amyl saccharide compound part instead of furfuryl alcohol as a material. According to the method disclosed by the invention, 5-35 parts of amyl saccharide compounds and 50-60 parts of furfuryl alcohol are combined as materials to replace a large quantity of furfuryl alcohol required in the prior art, so that the dosage of the furfuryl alcohol is reduced. Compared with the production of the traditional furan resin, the preparation method has the advantages that the production cost is reduced, the harm on the environment is reduced, and large-scale production is facilitated. Meanwhile, an aldehyde group and a polyhydroxy structure contained in an amyl saccharide compound molecule are utilized; a resin curing crosslinked point is increased in a process of preparing the furan resin; the situation that the resin forms a mesh structure in a curing process is facilitated; 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 who casts with self-hardening furan resin, be specifically related to a kind of preparation method who replaces furfuryl alcohol to produce casting self-hardening furan resin as material modification taking pentose part.
Background technology
Furane resin refer to have the furfuryl alcohol of furan nucleus and furfural makes the general name of 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 has added again urea) 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, acid, alkali, salt and organic solution are had to good resistibility, are good sanitass.Casting is the one of furfuryl alcohol resin with self-hardening furan resin, refer at room temperature and can make sand mold (core) sclerosis by acid catalysis, and in structure containing furan nucleus, have furfuryl alcohol, formaldehyde, urea and or the synthetic thermosetting resin such as phenol, be generally faint yellow to brown transparent or semitransparent uniform liquid.Casting is high by self-hardening furan resin intensity, is the good binding agents such as timber, rubber, metal and pottery, also can be used for producing coating.Casting is to make core binder in the casting technique of mechanical industry by an important use of self-hardening resin, is specially adapted to large-scale, large batch of machinofacture, as the production of automobile military project, oil engine, diesel engine, sewing machine etc.While being used for the binding agent of casting sand core, casting has following characteristics with self-hardening resin: curing speed is fast, normal temperature strength is low, decomposition temperature is high; According to the carbon content of different foundry goods, can select the resin of different nitrogen contents; Get angry little, hot strength is high, thermal expansivity is moderate, fragility is large, pore tendency is little, water absorbability is large, is widely used as binding agent in industries such as timber, rubber, metal, potteries, in mechanical industry, also play an important role.Especially add urea-modified after, can require to produce the furfuryl alcohol resin of different nitrogen contents according to difference, to meet the requirement of cast steel, cast iron and other non-ferrous metals casting techniques.
In prior art, general conventional cast with the synthesis technique of self-hardening furan resin is: in reactor, add 15-25 part formaldehyde, and start stirring for some time, then add part urea (5-8 part) to dissolve, and regulate pH to react certain hour under alkaline condition; Add a part of furfuryl alcohol (15-20 part) to react according to the requirement of the nitrogen content of required production resin again; After adding furfuryl alcohol, first regulate pH to react for some time under alkaline condition, the pH value of then adjusting again material system is reacted for acidity; Add subsequently remaining part urea (1-3 part) to reduce the free formaldehyde in resin, again whole material system is dewatered under vacuum condition, and add the furfuryl alcohol (40-75 part) of remaining part in the system after dehydration, and 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 self-hardening furan resin sand technique for casting, 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 of producing also relatively high, certain restriction inhibition has been played in this widespread use for furane resin.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, technical problem to be solved by this invention is in prior art that the casting a large amount of furfuryl alcohol of need of production consumption of preparing of self-hardening furan resin causes the problem that production cost is higher, and then provides a kind of and substitute furfuryl alcohol with pentose compounds part and produce and cast with self-hardening furan resin with the casting reducing production costs self-hardening furan resin preparation method.
Second technical problem to be solved by this invention is to provide a kind of raw material sources new method of preparing furane resin more widely.
For solving the problems of the technologies described above, the method that pentose compounds of the present invention substitutes furfuryl alcohol produces casting self-hardening furan resin, is characterized in that, comprises the steps:
(1) in reactor, add formaldehyde 15-25 part, and to regulate pH be that alkalescence is reacted, add subsequently pentose 5-35 part, control 80-100 DEG C of reaction of temperature;
(2) in reactor, add 5-8 part urea to stir while hot, and add 15-20 part furfuryl alcohol to react, and to adjust system pH be slightly acidic, control 80-100 DEG C of temperature of reaction and react;
(3) again add 1-3 part urea, and to adjust material system pH value be weakly alkaline, control 70-85 DEG C of reaction of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered, and add 35-40 part furfuryl alcohol, stir, obtain desired product;
The above umber is parts by weight.
Described pentose compounds comprises one or more the mixture in wood sugar, pectinose, Xylitol, lyxose, ribose.
In described step (1), adjusting pH is 8.0-10.0.
In described step (2), adjusting pH is 2.5-5.5.
In described step (3), adjusting pH is 7.5-9.5.
In described step (4), described processed is carried out under vacuum condition.
In described step (4), described processed dewaters to water ratio reactant lower than 20%.
In described step (1), the formaldehyde solution that described formaldehyde is 37% or polyoxymethylene.
In described step (2), regulate pH as slightly acidic taking dilute acid solns such as the sulfuric acid of 5-25%, hydrochloric acid, oxalic acid, sulfonic acid, taking oxalic acid as best.
In described step (1) and (3), regulate pH as alkalescence taking dilute acid solns such as sodium hydroxide, sodium carbonate, sodium bicarbonates, taking sodium hydroxide as best.
The invention also discloses a kind of casting self-hardening furan resin being prepared by aforesaid method.
Technique scheme of the present invention has the following advantages compared to existing technology, 1, the technique that replaces furfuryl alcohol production casting self-hardening furan resin with pentose compounds of the present invention, replace expensive furfuryl alcohol with cheap pentose compounds part, thereby reduce the consumption of furfuryl alcohol, compared with the production of traditional furane resin, reduce production cost, and the hazardness of environment has been reduced, be conducive to scale operation; 2, technology utilization pentose compounds of the present invention is participated in the building-up reactions of furane resin directly, simplify elder generation and be cyclized into furfural by pentose, generate furfuryl alcohol by hydrogenation of furfural again, finally participated in the technique of reaction generation furane resin by furfuryl alcohol, saved production cost; 3, in technique of the present invention, utilize and in pentose compounds molecule, contain aldehyde radical and poly-hydroxy structure, in the process of preparing furane resin, increase the cross-linking set of resin solidification, be conducive to resin and in solidification process, form reticulated structure, 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 unreacted formaldehyde consumes during urea-formaldehyde resin is synthetic, thereby reduce the content of free formaldehyde; 4, the pentose compounds that method of the present invention directly extensively exists using occurring in nature, as raw material production casting self-hardening furan resin, is synthetic a kind of raw material sources new way more widely that provides of furane resin; 5, the prepared product of technique of self-hardening furan resin for production casting 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 composition:
Formaldehyde (concentration 37%) 170Kg(17 part), urea 80Kg(8 part), furfuryl alcohol 560Kg(56 part) and, wood sugar 100Kg(10 part).
Described in the present embodiment, pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, comprises the steps:
(1) in reactor, add 17 parts, formaldehyde, regulate pH 9.2-9.4 to react with dilute solution of sodium bicarbonate, add subsequently 10 parts of wood sugars, control 90-95 DEG C of reaction 1h of temperature;
(2) in reactor, add 6 parts of urea dissolve and stir while hot, add subsequently 18 parts of furfuryl alcohols to react, and adjust system pH as 4.8-5.0 taking 20% hydrochloric acid soln, control 90-95 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 2 parts of urea, and adjust material system pH as 7.8-8.0 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 38 parts of furfuryl alcohols, stir, blowing obtains desired product 1100g left and right.
Embodiment 2
Starting material composition:
Formaldehyde (concentration 37%) 150Kg(15 part), urea 90Kg(9 part), furfuryl alcohol 550Kg(55 part) and, mixture 200 Kg(20 parts of pectinose and Xylitol).
Described in the present embodiment, pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, comprises the steps:
(1) be 20 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.2-9.4 to react with dilute solution of sodium hydroxide, add subsequently 20 parts of pectinoses, control 85-90 DEG C of reaction 1h of temperature;
(2) in reactor, add 6 parts of urea dissolve and stir while hot, add subsequently 15 parts of furfuryl alcohols to react, and adjust system pH as 2.5-3.5 taking 15% oxalic acid solution, control 85-90 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 3 parts of urea, and adjust material system pH as 8.0-8.4 taking sodium carbonate dilute solution, control 80-85 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 40 parts of furfuryl alcohols, stir, blowing obtains desired product 1000g left and right.
Embodiment 3
Starting material composition:
Polyoxymethylene solution (concentration 37%) 220Kg(22 part), urea 60Kg(6 part), furfuryl alcohol 600Kg(60 part) and, Xylitol 50 Kg(5 parts).
Described in the present embodiment, pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that, comprises the steps:
(1) be 22 parts of 37% polyoxymethylene solution to adding concentration in reactor, regulate pH 9.5-9.7 and be warming up to 85 DEG C with sodium carbonate dilute solution and react 1h, add subsequently 5 parts of Xylitols, control 80-85 DEG C of reaction 1h of temperature;
(2) in reactor, add 5 parts of urea dissolve and stir while hot, add subsequently 20 parts of furfuryl alcohols to react, and adjust system pH as 4.0-4.5 taking 10% sulphuric acid soln, control 80-85 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 1 part of urea, and adjust material system pH as 7.5-8.0 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 40 parts of furfuryl alcohols, stir, blowing obtains desired product 1000g left and right.
Embodiment 4
Starting material composition:
Formaldehyde (concentration 37%) 200Kg(20 part), urea 110Kg(11 part), furfuryl alcohol 500 Kg(50 parts) and, mixture 300 Kg(30 parts of lyxose and wood sugar).
Described in the present embodiment, pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, comprises the steps:
(1) be 20 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.2-9.4 and be warming up to 85 DEG C with dilute solution of sodium bicarbonate and react 1h, add subsequently 30 parts of lyxoses, control 95-100 DEG C of reaction 1h of temperature;
(2) in reactor, add 8 parts of urea dissolve and stir while hot, add subsequently 15 parts of furfuryl alcohols to react, and adjust system pH as 3.5-4.0 taking 5% semi-annular jade pendant acid solution, control 95-100 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 3 parts of urea, and adjust material system pH as 7.5-7.8 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 35 parts of furfuryl alcohols, stir, blowing obtains desired product 1050g left and right.
Embodiment 5
Starting material composition:
Formaldehyde (concentration 37%) 250Kg (25 parts), urea 100Kg(10 part), furfuryl alcohol 550Kg(55 part) and, ribose 350Kg(35 part).
Described in the present embodiment, pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, comprises the steps:
(1) be 25 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.0-9.2 to react 1h with dilute solution of sodium hydroxide, add subsequently 35 parts of wood sugars, control 90-95 DEG C of reaction 1h of temperature;
(2) in reactor, add 8 parts of urea dissolve and stir while hot, add subsequently 20 parts of furfuryl alcohols to react, and adjust system pH as 5.0-5.5 taking 15% oxalic acid solution, control 90-95 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 2 parts of urea, and adjust material system pH as 9.0-9.5 taking sodium carbonate dilute solution, control 70-75 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 35 parts of furfuryl alcohols, stir, blowing obtains desired product 1100g left and right.
Comparative example 1
Starting material composition:
Formaldehyde (concentration 37%) 170Kg(17 part), urea 80Kg(8 part), furfuryl alcohol 660Kg(66 part).
The method of producing casting self-hardening furan resin described in the present embodiment with prior art, comprises the steps:
(1) in reactor, add 17 parts, formaldehyde, regulate pH 9.2-9.4 and control temperature 90-95 DEG C of reaction 1h with dilute solution of sodium bicarbonate;
(2) in reactor, add 6 parts of urea dissolve and stir while hot, add subsequently 18 parts of furfuryl alcohols to react, and adjust system pH as 4.8-5.0 taking 20% hydrochloric acid soln, control 90-95 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 2 parts of urea, and adjust material system pH as 7.8-8.0 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 48 parts of furfuryl alcohols, stir, blowing obtains desired product 1100g left and right.
Comparative example 2
Starting material composition:
Formaldehyde (concentration 37%) 150Kg(15 part), urea 90Kg(9 part), furfuryl alcohol 750Kg(75 part).
The method of producing casting self-hardening furan resin described in the present embodiment with prior art, comprises the steps:
(1) be 20 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.2-9.4 and control temperature 85-90 DEG C of reaction 1h with dilute solution of sodium hydroxide;
(2) in reactor, add 6 parts of urea dissolve and stir while hot, add subsequently 15 parts of furfuryl alcohols to react, and adjust system pH as 2.5-3.5 taking 15% oxalic acid solution, control 85-90 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 3 parts of urea, and adjust material system pH as 8.0-8.4 taking sodium carbonate dilute solution, control 80-85 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 60 parts of furfuryl alcohols, stir, blowing obtains desired product 1000g left and right.
Comparative example 3
Starting material composition:
Polyoxymethylene solution (concentration 37%) 220Kg(22 part), urea 60Kg(6 part), furfuryl alcohol 650Kg(65 part).
The method of producing casting self-hardening furan resin described in the present embodiment with prior art, comprises the steps:
(1) be 22 parts of 37% polyoxymethylene solution to adding concentration in reactor, regulate pH 9.5-9.7 and be warming up to 85 DEG C with sodium carbonate dilute solution and react 1h;
(2) in reactor, add 5 parts of urea dissolve and stir while hot, add subsequently 20 parts of furfuryl alcohols to react, and adjust system pH as 4.0-4.5 taking 10% sulphuric acid soln, control 80-85 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 1 part of urea, and adjust material system pH as 7.5-8.0 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 45 parts of furfuryl alcohols, stir, blowing obtains desired product 1000g left and right.
Comparative example 4
Starting material composition:
Formaldehyde (concentration 37%) 200Kg(20 part), urea 110Kg(11 part), furfuryl alcohol 800Kg(80 part).
The method of producing casting self-hardening furan resin described in the present embodiment with prior art, comprises the steps:
(1) be 20 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.2-9.4 and be warming up to 85 DEG C with dilute solution of sodium bicarbonate and react 1h;
(2) in reactor, add 8 parts of urea dissolve and stir while hot, add subsequently 15 parts of furfuryl alcohols to react, and adjust system pH as 3.5-4.0 taking 5% semi-annular jade pendant acid solution, control 95-100 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 3 parts of urea, and adjust material system pH as 7.5-7.8 taking sodium carbonate dilute solution, control 75-80 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 65 parts of furfuryl alcohols, stir, blowing obtains desired product 1050g left and right.
Comparative example 5
Starting material composition:
Formaldehyde (concentration 37%) 250Kg(25 part), urea 100Kg(10 part), furfuryl alcohol 900Kg(90 part).
The method of producing casting self-hardening furan resin described in the present embodiment with prior art, comprises the steps:
(1) be 25 parts, 37% formaldehyde to adding concentration in reactor, regulate pH 9.0-9.2 to react 1h with dilute solution of sodium hydroxide;
(2) in reactor, add 8 parts of urea dissolve and stir while hot, add subsequently 20 parts of furfuryl alcohols to react, and adjust system pH as 5.0-5.5 taking 15% oxalic acid solution, control 90-95 DEG C of reaction 1.5h of temperature of reaction;
(3) again in the reactant obtaining in step (2), add 2 parts of urea, and adjust material system pH as 7.8-8.0 taking sodium carbonate dilute solution, control 70-75 DEG C of reaction 1h of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered under vacuum condition to water ratio lower than 20%, and add 70 parts of furfuryl alcohols, stir, blowing obtains desired product 1100g left and right.
More than the index comparing result of synthetic furane resin is in table 1.
The analytical procedure of nitrogen content, free formaldehyde and intensity: press JB/T7526-1994 " casting self-hardening furan resin " and carry out.
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 of normal temperature tension (MPa) |
| Embodiment 1 | 3.556 | 0.252 | 0.67 | 1.68 |
| Embodiment 2 | 3.937 | 0.265 | 0.65 | 1.70 |
| Embodiment 3 | 3.603 | 0.271 | 0.72 | 1.75 |
| Embodiment 4 | 3.667 | 0.252 | 0.68 | 1.69 |
| Embodiment 5 | 3.619 | 0.278 | 0.71 | 1.72 |
| Comparative example 1 | 3. 586 | 0.265 | 0.64 | 1.69 |
| Comparative example 2 | 3.907 | 0.223 | 0.68 | 1.70 |
| Comparative example 3 | 3.679 | 0.257 | 0.70 | 1.67 |
| Comparative example 4 | 3.651 | 0.276 | 0.66 | 1.69 |
| Comparative example 5 | 3.565 | 0.279 | 0.69 | 1.65 |
Can find out from the above results, replace furfuryl alcohol to produce compared with the furane resin that the furane resin that obtain prepare with prior art with of the present invention with pentose compounds part, its nitrogen content performance, the first intensity of normal temperature tension and the whole intensity of normal temperature tension are 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 completely and produces casting self-hardening furan resin, and effectively reduces process costs.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction 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 without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (7)
1. pentose compounds substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that, comprises the steps:
(1) in reactor, add formaldehyde 15-25 part, and to regulate pH be that alkalescence is reacted, add subsequently pentose compounds 5-35 part, control 80-100 DEG C of reaction of temperature;
(2) in reactor, add 5-8 part urea to stir while hot, and add 15-20 part furfuryl alcohol to react, and to adjust system pH be 2.5-5.5, control 80-100 DEG C of temperature of reaction and react;
(3) again add 1-3 part urea, and to adjust material system pH be 7.5-9.5, control 70-85 DEG C of reaction of temperature, then system is cooled to 45-50 DEG C and stopped reaction;
(4) reactant obtaining in step (3) is dewatered, and add 35-40 part furfuryl alcohol, stir, obtain desired product;
Described pentose compounds comprises one or more the mixture in wood sugar, pectinose, lyxose, ribose;
The above umber is parts by weight.
2. pentose compounds according to claim 1 substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that:
In described step (1), adjusting pH is 8.0-10.0.
3. pentose compounds according to claim 1 substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that:
In described step (4), described processed is carried out under vacuum condition.
4. pentose compounds according to claim 3 substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that:
In described step (4), described processed dewaters to water ratio reactant lower than 20%.
5. pentose compounds according to claim 1 substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that:
In described step (2), regulate pH as 2.5-5.5 taking sulfuric acid, hydrochloric acid, oxalic acid, the sulfonic acid dilute acid soln of 5-25%.
6. pentose compounds according to claim 1 substitutes furfuryl alcohol and produces the method for casting with self-hardening furan resin, it is characterized in that:
In described step (1) and (3), regulate pH as alkalescence taking sodium hydroxide, sodium carbonate, sodium bicarbonate dilute alkaline soln.
7. the casting self-hardening furan resin preparing according to the arbitrary described method of claim 1-6.
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Non-Patent Citations (2)
| Title |
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| 任玉艳等.糠醇替代材料对呋喃树脂自硬砂强度的影响.《铸造》.2008,第57卷(第11期),第1199-1121页. |
| 糠醇替代材料对呋喃树脂自硬砂强度的影响;任玉艳等;《铸造》;20081110;第57卷(第11期);第1199-1121页 * |
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Denomination of invention: Production of self hardening furan resin for casting by pentose compound instead of furfuryl alcohol Effective date of registration: 20211227 Granted publication date: 20140813 Pledgee: CITIC Bank Limited by Share Ltd. Ji'nan branch Pledgor: JINAN SHENGQUAN GROUP SHARE HOLDING Co.,Ltd. Registration number: Y2021980016380 |
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