CN103739798B - Thermoplastic phenol formaldehyde resin for ultrathin resin grinding tools and preparation method thereof - Google Patents
Thermoplastic phenol formaldehyde resin for ultrathin resin grinding tools and preparation method thereof Download PDFInfo
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- CN103739798B CN103739798B CN201310734706.6A CN201310734706A CN103739798B CN 103739798 B CN103739798 B CN 103739798B CN 201310734706 A CN201310734706 A CN 201310734706A CN 103739798 B CN103739798 B CN 103739798B
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Abstract
The invention provides a thermoplastic phenol formaldehyde resin for ultrathin resin grinding tools with high molecular weight dispersion coefficient and favorable high temperature fluidity and a preparation method thereof. The phenol formaldehyde resin comprises 200 parts of phenol, 35-65 parts of formaldehyde, 0.1-1.0 part of strong acid catalyst and 0.1-1.8 part of weak acid catalyst. The preparation method comprises the following steps: in the first stage, the 100 parts of phenol, 20-35 parts of formaldehyde and 0.1-1.0 part of strong acid catalyst are added; and in the second stage, the 100 parts of phenol, 15-30 parts of formaldehyde and 0.1-1.8 parts of weak acid are added. The thermoplastic phenol formaldehyde resin prepared by sectional polycondensation reaction has higher molecular weight dispersion coefficient and favorable high temperature fluidity; the resin grinding tool manufacturing hardening curve is set more easily; and the grinding wheel prepared from the powder phenol formaldehyde resin has lower property attenuation, and is beneficial to prolonging the service life. The method is applicable to the field of manufacturing of resins.
Description
Technical field
The present invention relates to a kind of resol, particularly relate to the preparation method of a kind of ultrathin section resin abrasive tools novolac resin and this resol.
Background technology
Resol is widely applied in all trades and professions.At abrasive tool industry, adopt the technology of novolac resin making resin abrasive tools also ripe.But the novolac resin preparing resin abrasive tools at present due to its molecular weight dispersion coefficient not high, and mobility when high temperature is not good enough, very large impact is caused on the quality of obtained resin abrasive tools, cause its grinding efficiency low, grinding tool performance degradation speed is fast, and the work-ing life of grinding tool shortens greatly.For this reason, need to design a kind of new grinding tool, to overcome above-mentioned defect.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of and have higher molecular weight dispersion coefficient, ultrathin section resin abrasive tools novolac resin that temperature flowing is good and preparation method thereof.
The technical scheme that ultrathin section resin abrasive tools novolac resin of the present invention adopts is: calculate according to the mass fraction, this resol comprises following component: phenol 200 parts, 35 ~ 65 parts, formaldehyde, strong acid catalyst 0.1 ~ 1.0 part, weak acid catalyst 0.1 ~ 1.8 part; When preparing this resol, point two stages add, and the first stage adds phenol 100 parts, 20 ~ 35 parts, formaldehyde, strong acid catalyst 0.1 ~ 1.0 part; Subordinate phase adds phenol 100 parts, 15 ~ 30 parts, formaldehyde, weak acid catalyst 0.1 ~ 1.8 part.
Described strong acid catalyst is hydrochloric acid, sulfuric acid or nitric acid, and described weak acid catalyst is oxalic acid, oxalic acid or silicic acid.
When preparing this resol, the reaction in two stages is segmentation polycondensation building-up reactions.
The preparation method of above-mentioned resol comprises the following steps:
(1) phenol, formaldehyde measure respectively, add in the reactor with agitator, condenser, temperature measuring equipment, stir 20 ~ 30min, 20% ~ 40% of the strong acid catalyst after being diluted by 1:1 slowly adds in reactor, stir, be warming up to boiling, under maintenance boiling temperature condition, after polycondensation 5 ~ 20min, in slower dropping mode, add 60% ~ 80% remaining strong acid catalyst, boiling reaction 60 ~ 120min, is then cooled to 50 ~ 70 DEG C;
(2) again add phenol, formaldehyde, the weak acid catalyst through metering, be warming up to boiling, under maintenance boiling temperature condition, boiling reaction 60 ~ 120min;
(3) decompression dehydration to vacuum tightness is 0.07 ~ 0.09MPa, when dehydrated material temperature reaches 150 ~ 180 DEG C, stop dehydration, be cooled to 130 ~ 150 DEG C, add intrinsic toughening agent fast, after stirring 20 ~ 40min, open bottom valve, blowing, cooling, obtains ultrathin section resin abrasive tools novolac resin.
The method is further comprising the steps of: resol gained being cooled to room temperature is broken into the bulk of diameter 10 ~ 20mm, then add urotropine according to 8% ~ 14% of gained phenolic resin weight, send in high speed jet mill simultaneously and be ground into 200 order screen overflows not higher than the powder resol of 5% granularity.
The invention has the beneficial effects as follows: the present invention adopts salvage technique, first phenol, formaldehyde and strong acid catalyst, carry out ebuillition of heated polycondensation, after reaction 20 ~ 60min, be cooled to 50 ~ 70 DEG C; Subordinate phase polycondensation, temperature of charge 50 ~ 70 DEG C, weigh second time and add phenol, formaldehyde and weak acid catalyst, carry out heating polycondensation, the reaction times controls at 60 ~ 120min, then carries out decompression dehydration, cooling, fragmentation, abrasive dust, makes ultrathin section resin abrasive tools powder resol; This powder resol can substitute coventional type 2123 resol, under the condition not changing resin abrasive tools manufacturing process, the ultrathin section resin abrasive tools made, is not increasing in material cost situation, because powder resol molecular weight dispersion coefficient increases production resin wheel preferably; Resol temperature flowing of the present invention is good simultaneously, and it is easier that the hardening curve that resin abrasive tools manufactures is arranged; Cut grinding efficiency with the emery wheel that powder resol of the present invention is produced in addition to improve, more easily make efficient emery wheel easy to operate; The more important thing is that the grinding wheel performance decay made from powder resol of the present invention reduces, contribute to promoting work-ing life.
Embodiment
The present invention gives a kind of ultrathin section resin abrasive tools novolac resin and preparation method thereof.With specific embodiment, the invention will be further described below.
embodiment one:
Ultrathin section resin abrasive tools novolac resin of the present invention is calculated according to the mass fraction, comprises following component: phenol 200 parts, 35 parts, formaldehyde, strong acid catalyst 0.1 part, weak acid catalyst 0.1 part; When preparing this resol, point two stages add, and the first stage adds phenol 100 parts, 20 parts, formaldehyde, strong acid catalyst 0.1 part; Subordinate phase adds phenol 100 parts, 15 parts, formaldehyde, weak acid catalyst 0.1 part.Described strong acid catalyst is hydrochloric acid, and described weak acid catalyst is oxalic acid.
Preparation method:
(1) phenol, formaldehyde measure respectively, add in the reactor with agitator, condenser, temperature measuring equipment, stir 20 ~ 30min, 20% ~ 40% of the strong acid catalyst after being diluted by 1:1 slowly adds in reactor, stir, be warming up to boiling, under maintenance boiling temperature condition, after polycondensation 5 ~ 20min, in slower dropping mode, add 60% ~ 80% remaining strong acid catalyst, boiling reaction 60 ~ 120min, is then cooled to 50 ~ 70 DEG C;
(2) again add phenol, formaldehyde, the weak acid catalyst through metering, be warming up to boiling, under maintenance boiling temperature condition, boiling reaction 60 ~ 120min;
(3) decompression dehydration to vacuum tightness is 0.07 ~ 0.09MPa, when dehydrated material temperature reaches 150 ~ 180 DEG C, stop dehydration, be cooled to 130 ~ 150 DEG C, add intrinsic toughening agent (as nylon-66) fast, after stirring 20 ~ 40min, open bottom valve, blowing, cooling, obtains ultrathin section resin abrasive tools novolac resin.
Resol gained being cooled to room temperature is broken into the bulk of diameter 10 ~ 20mm, then add urotropine according to 8% ~ 14% of gained phenolic resin weight, send in high speed jet mill simultaneously and be ground into 200 order screen overflows not higher than the powder resol of 5% granularity.
embodiment two:
In the present embodiment, ultrathin section resin abrasive tools novolac resin of the present invention is calculated according to the mass fraction, comprises following component: phenol 200 parts, 50 parts, formaldehyde, strong acid catalyst 0.5 part, weak acid catalyst 1 part; When preparing this resol, point two stages add, and the first stage adds phenol 100 parts, 25 parts, formaldehyde, strong acid catalyst 0.5 part; Subordinate phase adds phenol 100 parts, 25 parts, formaldehyde, weak acid catalyst 1 part.Described strong acid catalyst is sulfuric acid, and described weak acid catalyst is oxalic acid.
Preparation method: in the present embodiment, its preparation method is identical with the preparation method in embodiment one.
embodiment three:
In the present embodiment, ultrathin section resin abrasive tools novolac resin of the present invention is calculated according to the mass fraction, comprises following component: phenol 200 parts, 65 parts, formaldehyde, strong acid catalyst 1 part, weak acid catalyst 1.8 parts; When preparing this resol, point two stages add, and the first stage adds phenol 100 parts, 35 parts, formaldehyde, strong acid catalyst 1 part; Subordinate phase adds phenol 100 parts, 30 parts, formaldehyde, weak acid catalyst 1.8 parts.Described strong acid catalyst is sulfuric acid, and described weak acid catalyst is oxalic acid.
Preparation method: in the present embodiment, its preparation method is identical with the preparation method in embodiment one.
The powder resol obtained by the present invention can substitute coventional type 2123 resol, under the condition not changing resin abrasive tools manufacturing process, the ultrathin section resin abrasive tools made, do not increasing in material cost situation, because powder resol molecular weight dispersion coefficient increases production resin wheel preferably; Resol temperature flowing of the present invention is good simultaneously, and it is easier that the hardening curve that resin abrasive tools manufactures is arranged; Cut grinding efficiency with the emery wheel that powder resol of the present invention is produced in addition to improve, more easily make efficient emery wheel easy to operate; The more important thing is that the grinding wheel performance decay made from powder resol of the present invention reduces, contribute to promoting work-ing life.
The above is the present invention for helping to understand and is preferably embodiment; invention scope of the present invention is not limited in the above described manner; herein means out; for the person of ordinary skill of the art; under the premise without departing from the principles of the invention; the equivalence made the present invention is modified, changes or is improved, and all should include in protection domain required in claims.
The present invention can be applicable to resin manufacture field.
Claims (5)
1. a ultrathin section resin abrasive tools novolac resin, is characterized in that, calculates according to the mass fraction, and this resol comprises following component:
Phenol 200 parts, 35 ~ 65 parts, formaldehyde, strong acid catalyst 0.1 ~ 1.0 part, weak acid catalyst 0.1 ~ 1.8 part; When preparing this resol, point two stages add, and the first stage adds phenol 100 parts, 20 ~ 35 parts, formaldehyde, strong acid catalyst 0.1 ~ 1.0 part; Subordinate phase adds phenol 100 parts, 15 ~ 30 parts, formaldehyde, weak acid catalyst 0.1 ~ 1.8 part.
2. a kind of ultrathin section resin abrasive tools novolac resin according to claim 1, it is characterized in that: described strong acid catalyst is hydrochloric acid, sulfuric acid or nitric acid, described weak acid catalyst is oxalic acid, oxalic acid or silicic acid.
3. a kind of ultrathin section resin abrasive tools novolac resin according to claim 1, is characterized in that: when preparing this resol, the reaction in two stages is segmentation polycondensation building-up reactions.
4. a preparation method for ultrathin section resin abrasive tools novolac resin as claimed in claim 1, it is characterized in that, the method comprises the following steps:
(1) phenol, formaldehyde measure respectively, add in the reactor with agitator, condenser, temperature measuring equipment, stir 20 ~ 30min, 20% ~ 40% of the strong acid catalyst after being diluted by 1:1 slowly adds in reactor, stir, be warming up to boiling, under maintenance boiling temperature condition, after polycondensation 5 ~ 20min, in slower dropping mode, add 60% ~ 80% remaining strong acid catalyst, boiling reaction 60 ~ 120min, is then cooled to 50 ~ 70 DEG C;
(2) again add phenol, formaldehyde, the weak acid catalyst through metering, be warming up to boiling, under maintenance boiling temperature condition, boiling reaction 60 ~ 120min;
(3) decompression dehydration to vacuum tightness is 0.07 ~ 0.09MPa, when dehydrated material temperature reaches 150 ~ 180 DEG C, stop dehydration, be cooled to 130 ~ 150 DEG C, add intrinsic toughening agent fast, after stirring 20 ~ 40min, open bottom valve, blowing, cooling, obtains ultrathin section resin abrasive tools novolac resin.
5. the preparation method of ultrathin section resin abrasive tools novolac resin according to claim 4, it is characterized in that, the method is further comprising the steps of: resol gained being cooled to room temperature is broken into the bulk of diameter 10 ~ 20mm, then add urotropine according to 8% ~ 14% of gained phenolic resin weight, send in high speed jet mill simultaneously and be ground into 200 order screen overflows not higher than the powder resol of 5% granularity.
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| CN201310734706.6A CN103739798B (en) | 2013-12-27 | 2013-12-27 | Thermoplastic phenol formaldehyde resin for ultrathin resin grinding tools and preparation method thereof |
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| CN201310734706.6A CN103739798B (en) | 2013-12-27 | 2013-12-27 | Thermoplastic phenol formaldehyde resin for ultrathin resin grinding tools and preparation method thereof |
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| CN103739798B true CN103739798B (en) | 2015-07-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104530338A (en) * | 2014-12-31 | 2015-04-22 | 珠海邦瑞合成材料有限公司 | Powder phenolic resin used for antidamping modified ultrathin piece resin grinding apparatus and preparation method thereof |
| CN104479600B (en) * | 2015-01-07 | 2016-08-24 | 河北三楷深发科技股份有限公司 | Sodium methyl silicate catalysis rock wool produces the synthetic method of applying glue adhesive |
| CN106674454A (en) * | 2016-12-30 | 2017-05-17 | 珠海邦瑞合成材料有限公司 | Powdery phenolic resin for diamond grinding block and preparation method thereof |
| CN110903445B (en) * | 2019-11-30 | 2022-06-03 | 浙江自立高分子化工材料有限公司 | Phenolic resin for coil framework and preparation method thereof |
| CN114163593A (en) * | 2022-02-15 | 2022-03-11 | 北京玻钢院复合材料有限公司 | Polyether modified phenolic resin for heavy-load grinding wheel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101104672A (en) * | 2007-08-09 | 2008-01-16 | 山东圣泉化工股份有限公司 | High-performance modified phenolic resin and its producing process |
| CN102516911A (en) * | 2011-12-14 | 2012-06-27 | 黄石金朝阳粉末材料有限责任公司 | Modified phenolic resin adhesive for friction material and preparation method for modified phenolic resin adhesive |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104672A (en) * | 2007-08-09 | 2008-01-16 | 山东圣泉化工股份有限公司 | High-performance modified phenolic resin and its producing process |
| CN102516911A (en) * | 2011-12-14 | 2012-06-27 | 黄石金朝阳粉末材料有限责任公司 | Modified phenolic resin adhesive for friction material and preparation method for modified phenolic resin adhesive |
Non-Patent Citations (1)
| Title |
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| 磨具磨料用酚醛树脂的合成;官仕龙等;《热固性树脂》;20100930;第25卷(第5期);第34-36页 * |
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