CN103739798A - 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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- CN103739798A CN103739798A CN201310734706.6A CN201310734706A CN103739798A CN 103739798 A CN103739798 A CN 103739798A CN 201310734706 A CN201310734706 A CN 201310734706A CN 103739798 A CN103739798 A CN 103739798A
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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, relate in particular to the preparation method of novolac resin and this resol for a kind of ultrathin section resin abrasive tools.
Background technology
Resol is widely applied in all trades and professions.In grinding tool field, adopt the technology of novolac resin making resin abrasive tools also ripe.But prepare at present the novolac resin of resin abrasive tools because its molecular weight dispersion coefficient is not high, and the mobility when high temperature is not good enough, the quality of the resin abrasive tools making is caused to very large impact, cause its grinding efficiency low, grinding tool performance degradation speed is fast, and greatly shorten the work-ing life of grinding tool.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 is to overcome the deficiencies in the prior art, and a kind of novolac resin and preparation method thereof for ultrathin section resin abrasive tools that higher molecular weight dispersion coefficient, temperature flowing are good that has is provided.
The technical scheme that ultrathin section resin abrasive tools of the present invention adopts with novolac resin is: calculate according to the mass fraction, this resol comprises following component: 200 parts of phenol, 35～65 parts, formaldehyde, 0.1～1.0 part of strong acid catalyst, 0.1～1.8 part of weak acid catalyzer; When this resol of preparation, minute two stages add, and the first stage adds 100 parts of phenol, 20～35 parts, formaldehyde, 0.1～1.0 part of strong acid catalyst; Subordinate phase adds 100 parts of phenol, 15～30 parts, formaldehyde, 0.1～1.8 part of weak acid catalyzer.
Described strong acid catalyst is hydrochloric acid, sulfuric acid or nitric acid, and described weak acid catalyzer is oxalic acid, oxalic acid or silicic acid.
When this resol of preparation, 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, by 20%～40% of the strong acid catalyst after 1:1 dilution, slowly add in reactor, stir, be warming up to boiling, keeping under 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 ℃;
(2) again add phenol, formaldehyde, the weak acid catalyzer through metering, be warming up to boiling, keeping under 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 ℃, stop dehydration, be cooled to 130～150 ℃, add fast intrinsic toughening agent, stir after 20～40min, open bottom valve, blowing, cooling, obtain ultrathin section resin abrasive tools novolac resin.
The method is further comprising the steps of: the resol that gained is cooled to room temperature is broken into the bulk of diameter 10～20mm, then according to 8%～14% of gained resol weight, add urotropine, send into simultaneously and in high speed jet mill, 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, is cooled to 50～70 ℃; Subordinate phase polycondensation, 50～70 ℃ of temperature of charge, weigh and add for the second time phenol, formaldehyde and weak acid catalyzer, heat polycondensation, the reaction times is controlled 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, do not changing under the condition of resin abrasive tools manufacturing process, the ultrathin section resin abrasive tools of making, 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 the hardening curve setting that resin abrasive tools is manufactured is easier; With the emery wheel that powder resol of the present invention is produced, cut grinding efficiency in addition and 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, and contributes to promote work-ing life.
Embodiment
The present invention has provided novolac resin and preparation method thereof for a kind of ultrathin section resin abrasive tools.With specific embodiment, the invention will be further described below.
embodiment mono-:
Ultrathin section resin abrasive tools of the present invention is calculated according to the mass fraction with novolac resin, comprises following component: 200 parts of phenol, 35 parts, formaldehyde, 0.1 part of strong acid catalyst, 0.1 part of weak acid catalyzer; When this resol of preparation, minute two stages add, and the first stage adds 100 parts of phenol, 20 parts, formaldehyde, 0.1 part of strong acid catalyst; Subordinate phase adds 100 parts of phenol, 15 parts, formaldehyde, 0.1 part of weak acid catalyzer.Described strong acid catalyst is hydrochloric acid, and described weak acid catalyzer is oxalic acid.
Preparation method:
(1) phenol, formaldehyde measure respectively, add in the reactor with agitator, condenser, temperature measuring equipment, stir 20～30min, by 20%～40% of the strong acid catalyst after 1:1 dilution, slowly add in reactor, stir, be warming up to boiling, keeping under 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 ℃;
(2) again add phenol, formaldehyde, the weak acid catalyzer through metering, be warming up to boiling, keeping under 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 ℃, stop dehydration, be cooled to 130～150 ℃, add fast intrinsic toughening agent (as nylon-66), stir after 20～40min, open bottom valve, blowing, cooling, obtain ultrathin section resin abrasive tools novolac resin.
The resol that gained is cooled to room temperature is broken into the bulk of diameter 10～20mm, then according to 8%～14% of gained resol weight, add urotropine, send into simultaneously and in high speed jet mill, be ground into 200 order screen overflows not higher than the powder resol of 5% granularity.
embodiment bis-:
In the present embodiment, ultrathin section resin abrasive tools of the present invention is calculated according to the mass fraction with novolac resin, comprises following component: 200 parts of phenol, 50 parts, formaldehyde, 0.5 part of strong acid catalyst, 1 part of weak acid catalyzer; When this resol of preparation, minute two stages add, and the first stage adds 100 parts of phenol, 25 parts, formaldehyde, 0.5 part of strong acid catalyst; Subordinate phase adds 100 parts of phenol, 25 parts, formaldehyde, 1 part of weak acid catalyzer.Described strong acid catalyst is sulfuric acid, and described weak acid catalyzer is oxalic acid.
Preparation method: in the present embodiment, its preparation method is identical with the preparation method in embodiment mono-.
embodiment tri-:
In the present embodiment, ultrathin section resin abrasive tools of the present invention is calculated according to the mass fraction with novolac resin, comprises following component: 200 parts of phenol, 65 parts, formaldehyde, 1 part of strong acid catalyst, 1.8 parts of weak acid catalyzer; When this resol of preparation, minute two stages add, and the first stage adds 100 parts of phenol, 35 parts, formaldehyde, 1 part of strong acid catalyst; Subordinate phase adds 100 parts of phenol, 30 parts, formaldehyde, 1.8 parts of weak acid catalyzer.Described strong acid catalyst is sulfuric acid, and described weak acid catalyzer is oxalic acid.
Preparation method: in the present embodiment, its preparation method is identical with the preparation method in embodiment mono-.
The powder resol being made by the present invention can substitute coventional type 2123 resol, do not changing under the condition of resin abrasive tools manufacturing process, the ultrathin section resin abrasive tools of making, 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 the hardening curve setting that resin abrasive tools is manufactured is easier; With the emery wheel that powder resol of the present invention is produced, cut grinding efficiency in addition and 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, and contributes to promote work-ing life.
The above is the present invention for helping to understand and being embodiment preferably; invention scope of the present invention is not limited in the above described manner; at this, point out; for the person of ordinary skill of the art; under the premise without departing from the principles of the invention; equivalence that the present invention is made is modified, is changed or improves, and all should include in claims in desired protection domain.
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:
200 parts of phenol, 35～65 parts, formaldehyde, 0.1～1.0 part of strong acid catalyst, 0.1～1.8 part of weak acid catalyzer; When this resol of preparation, minute two stages add, and the first stage adds 100 parts of phenol, 20～35 parts, formaldehyde, 0.1～1.0 part of strong acid catalyst; Subordinate phase adds 100 parts of phenol, 15～30 parts, formaldehyde, 0.1～1.8 part of weak acid catalyzer.
2. a kind of ultrathin section resin abrasive tools novolac resin according to claim 1, is characterized in that: described strong acid catalyst is hydrochloric acid, sulfuric acid or nitric acid, and described weak acid catalyzer 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 this resol of preparation, the reaction in two stages is segmentation polycondensation building-up reactions.
4. a preparation method for novolac resin for ultrathin section resin abrasive tools as claimed in claim 1, 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, by 20%～40% of the strong acid catalyst after 1:1 dilution, slowly add in reactor, stir, be warming up to boiling, keeping under 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 ℃;
(2) again add phenol, formaldehyde, the weak acid catalyzer through metering, be warming up to boiling, keeping under 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 ℃, stop dehydration, be cooled to 130～150 ℃, add fast intrinsic toughening agent, stir after 20～40min, open bottom valve, blowing, cooling, obtain ultrathin section resin abrasive tools novolac resin.
5. according to right 4 requirements, the manufacture method of resol for a kind of ultrathin section resin wheel, it is characterized in that, the method is further comprising the steps of: the resol that gained is cooled to room temperature is broken into the bulk of diameter 10～20mm, then according to 8%～14% of gained resol weight, add urotropine, send into simultaneously and in high speed jet mill, 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104479600A (en) * | 2015-01-07 | 2015-04-01 | 河北金舵建材科技开发有限公司 | Synthetic method for sizing adhesive for rock wool production under catalysis of methyl sodium silicate |
| 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 |
| 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 |
| CN110903445A (en) * | 2019-11-30 | 2020-03-24 | 绍兴上虞自强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 |
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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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2013
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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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104479600A (en) * | 2015-01-07 | 2015-04-01 | 河北金舵建材科技开发有限公司 | Synthetic method for sizing adhesive for rock wool production under catalysis of methyl sodium silicate |
| 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 |
| CN110903445A (en) * | 2019-11-30 | 2020-03-24 | 绍兴上虞自强高分子化工材料有限公司 | Phenolic resin for coil framework 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 |
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| CN103739798B (en) | 2015-07-15 |
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