CN100365036C - Production of modified phenolic resin with high boron content - Google Patents
Production of modified phenolic resin with high boron content Download PDFInfo
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- CN100365036C CN100365036C CNB2006100245150A CN200610024515A CN100365036C CN 100365036 C CN100365036 C CN 100365036C CN B2006100245150 A CNB2006100245150 A CN B2006100245150A CN 200610024515 A CN200610024515 A CN 200610024515A CN 100365036 C CN100365036 C CN 100365036C
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Abstract
The present invention relates to a preparation method of boron modified phenolic resin having a high boron content, which belongs to the technical field of materials. In the method, firstly, boracic acid and phenol react to generate boric acid ester with a two-step method, and secondly, the boric acid ester is utilized to react with paraformaldehyde to obtain the boron modified phenolic resin having a high boron content. In the reaction technology, the boron modified phenolic resin having high boron contents, which has different boron contents, can be obtained by reasonably controlling the reaction temperature, the reaction time and other conditions and monitoring the reaction by means of modern instrumental analysis. The preparation method provided by the present invention has the characteristics of simplicity, easy implementation, controllability and quantification. The obtained boron modified phenolic resin has the advantages of high boron content, superior thermal property, superior mechanical property, superior frictional property and superior ablation resisting property. The boron modified phenolic resin can be widely used for multiple fields of high temperature braking friction materials, ablation resisting materials, special structural materials, thermal preventing materials, etc.
Description
Technical field
The invention belongs to the material technology field, be specifically related to a kind of preparation method of modified phenolic resin with high boron content.
Technical background
Resol is the synthetic resins of realizing suitability for industrialized production in the world the earliest, so far the history of existing last 100 years.Because its raw material is easy to get, cheap, production technique and equipment are simple, the more important thing is that it has excellent mechanicalness, thermotolerance, ablation resistance, electrical insulating property, dimensional stability, forming process and flame retardant resistance, resol has become the industrial sector indispensable material, is widely used at aspects such as aircraft and aviation field, military equipment field, automobile and transport trade, construction industries.But along with industrial expansion, the particularly development of space flight and aviation and other national defence sophisticated technology, drawbacks limit such as traditional unmodified resol fragility is big, poor toughness and poor heat resistance the development of its high performance material.Therefore, in order to adapt to the needs of high-technology fields such as automobile, Aeronautics and Astronautics and national defense industry, resol is carried out modification, improving its thermotolerance and toughness is the direction of phenolic resin material development.
At present, a lot of to phenolic resin modified method both at home and abroad, according to the reaction mechanism of resol, the modification approach has three: (1) sealing phenolic hydroxyl group, phenolic hydroxyl group in the resol molecule absorbs water easily, also easily is oxidized to quinone, and this is the major cause that the resol thermotolerance is bad, intensity is not high; (2) introduce other component, cut apart the encirclement phenolic hydroxyl group, reach the purpose that changes curing speed, reduction water-absorbent, improves performance by other component; (3) introduce material, the kindliness of regulating resol with flexible group.Boron modified phenolic resin is a most successful present phenolic resin modified kind, boron modified phenolic resin is introduced boron exactly in the resol structure, hydrogen in the phenolic hydroxyl group is replaced by the boron atom, B-O key bond energy is higher than the C-C key, the three-dimensional cross-linked reticulated structure of boracic in the cured product, so its thermotolerance and ablation resistance are much higher than general resol.The B-O key has kindliness preferably again, thereby the fragility of resol reduces after the modification, and mechanical property increases.Boron modified phenolic resin is suitable for the matrix resin as the high-temperature brake friction materials, and is the body material of good ablation resistant material.
The boron modified phenolic resin that present market can buy, its boron content has only 3%.From the structure of boron bakelite resin as can be known, the quality of modified phenolic resins thermal characteristics, mechanical property directly is decided by the height of boron content.At present, also do not have both at home and abroad a kind of effectively about the preparation method's of the modified phenolic resins of high boron content report.
Summary of the invention
The objective of the invention is to propose a kind of preparation method of modified phenolic resin with high boron content.
The preparation method of the modified phenolic resin with high boron content that the present invention proposes, the operational path of employing two step method, at first boric acid and phenol reactant generate boric acid ester, and boric acid ester reacts with Paraformaldehyde 96 (solid) again, generates boracic modified resol.
Its concrete steps are as follows:
(1) phenol and the 5～100ml organic solvent with 2～100g joins in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed, be warming up to 40～150 ℃, add 2～70g boric acid then, regulate the pH value of solution in the four-hole bottle with alkali, when PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 40～150 ℃ temperature, reaction times is 1～6 hour, and vacuum tightness is 0.1～1KPa; Treat liquid clarification and be little when orange, stop pumping; The mol ratio of its mesoboric acid and phenol is 1/5～5/1;
(2) add the Paraformaldehyde 96 of 2～50g in the product that in step (1), obtains, under 40～150 ℃ of temperature, react, stir simultaneously, and decompression dehydration, the reaction times is 1～8 hour, carrying out along with dehydration, liquid in the reaction flask becomes sticky thick gradually, and is yellow-green colour, stopped reaction, cooling promptly gets desired product.
Among the present invention, organic solvent described in the step (1) is a kind of in toluene, ethanol, propyl alcohol, propyl carbinol, isopropylcarbinol, acetone, chloroform or the tetrahydrofuran (THF) etc.
Among the present invention, alkali described in the step (1) is a kind of in basic metal, alkaline earth metal hydroxides or the carbonate etc.
Among the present invention, Paraformaldehyde 96 is a solid described in the step (2), and its molecular weight is 90～500.
The present invention prepares the application of the modified phenolic resins of high boron content in various fields such as high-temperature brake friction materials, ablation resistant material, unique construction material, heat insulation materials.
In the inventive method in the resulting boron modified phenolic resin content of boron can adopt the conventional sense means to detect, as adopting XPS or quantitative nuclear magnetic resonance method etc.
Preparation method provided by the invention is simple, has the characteristics of controllability and quantification; The boron modified phenolic resin of gained has higher boron content, have good thermal characteristics, mechanical property, frictional behaviour and ablation resistance, can be widely used in various fields such as high-temperature brake friction materials, ablation resistant material, unique construction material, heat insulation material.
Description of drawings
Fig. 1 is a kind of infrared spectrogram of modified phenolic resin with high boron content.
Embodiment
The following examples are to further specify of the present invention, rather than limit the scope of the invention.
Embodiment 1:
Step (1): press the mol ratio of boric acid/phenol=1/3, phenol and the 40ml toluene solution of 28.2g joined in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed.Be warming up to 90 ℃, add 6.2g boric acid then, regulate solution pH value in the four-hole bottle with the NaOH solution of 0.1mol/L simultaneously, after between PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 90 ℃ temperature range, reaction times is 3 hours, and vacuum tightness is 0.1～1KPa; Treat that liquid is clarification and for little when orange, and draw water for a long time when not had water generates, stop pumping.
Step (2) adds the Paraformaldehyde 96 of 10.2g, and molecular weight is 450, makes it 100 ℃ of reactions, stir simultaneously, and decompression dehydration.Along with the carrying out of dehydration, the liquid in the reaction flask becomes sticky thick gradually, react after 3-4 hour, and when it is yellow-green colour, stopped reaction, cooling promptly gets the resin solid of oyster.
Fig. 1 has provided a kind of infrared spectrogram of modified phenolic resin with high boron content, has synthesized boron modified phenolic resin as can be seen.
Table 1 is the relation of boron content and absorption peak strength in this boron bakelite resin, as seen is higher than reference sample (No. 4) by boron content in the boron modified phenolic resin of embodiment 1 gained from table 1, is 4.1% through its boron content of XPS analysis.
Embodiment 2: change the mol ratio of the boric acid/phenol of embodiment 1 step (1) into 1/2 by 1/3, press the mol ratio of boric acid/phenol=1/2, phenol and the 30ml ethanolic soln of 18.8g joined in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed.Be warming up to 60 ℃, add 6.2g boric acid then, regulate solution pH value in the four-hole bottle with the potassium hydroxide solution of 0.1mol/L simultaneously, after between PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 90 ℃ temperature range, reaction times is 6 hours, and vacuum tightness is 0.1～1KPa; Treat that liquid is clarification and for little when orange, and draw water for a long time when not had water generates, stop pumping.
Step (2) adds the Paraformaldehyde 96 of 10.2g, and molecular weight is 200, makes it 80 ℃ of reactions, stir simultaneously, and decompression dehydration.Along with the carrying out of dehydration, the liquid in the reaction flask becomes sticky thick gradually, reacts after 5-6 hour, when it is yellow-green colour, stopped reaction, cooling promptly gets the resin solid of oyster, obtain target product, current analytical procedure obtains that boron content is 6.6% (No. 2 samples in the table 1) in this boron bakelite resin.
Embodiment 3: change the mol ratio of the boric acid/phenol of embodiment 1 step (1) into 2/1 by 1/3, press the mol ratio of boric acid/phenol=2/1, phenol and the 20ml tetrahydrofuran solution of 9.4g joined in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed.Be warming up to 90 ℃, add 12.4g boric acid then, regulate solution pH value in the four-hole bottle with the calcium carbonate soln of 0.1mol/L simultaneously, after between PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 110 ℃ temperature range, reaction times is 4 hours, and vacuum tightness is 0.1～1KPa; Treat that liquid is clarification and for little when orange, and draw water for a long time when not had water generates, stop pumping;
Step (2) adds the Paraformaldehyde 96 of 10.2g, and molecular weight is 200, makes it 80 ℃ of reactions, stir simultaneously, and decompression dehydration.Along with the carrying out of dehydration, the liquid in the reaction flask becomes sticky thick gradually, reacts after 5-6 hour, when it is yellow-green colour, stopped reaction, cooling promptly gets the resin solid of oyster, obtain target product, current analytical procedure obtains that boron content is 9.0% (No. 3 samples in the table 1) in this boron bakelite resin.
Embodiment 4:
Step (1): press the mol ratio of boric acid/phenol=3/1, phenol and the 20ml toluene solution of 9.4g joined in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed.Be warming up to 60 ℃, add 18.6g boric acid then, regulate solution pH value in the four-hole bottle with the NaOH solution of 0.1mol/L simultaneously, after between PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 90 ℃ temperature range, reaction times is 5 hours, and vacuum tightness is 0.1～1KPa; Treat that liquid is clarification and for little when orange, and draw water for a long time when not had water generates, stop pumping;
Step (2) adds the Paraformaldehyde 96 of 10.2g, makes it 140 ℃ of reactions, stir simultaneously, and decompression dehydration.Along with the carrying out of dehydration, the liquid in the reaction flask becomes sticky thick gradually, react after 2-3 hour, and when it is yellow-green colour, stopped reaction, cooling promptly gets the resin solid of oyster.Current analytical procedure obtains that boron content is 8.4 in this boron bakelite resin.
Table 1: the thermogravimetric analysis result of modified phenolic resin with high boron content
| | Embodiment | 1 | Embodiment 2 | Embodiment 3 | Reference sample 4 |
| Absorbancy (the A of B-O key B-O) absorbancy (A of C=C key C＝C) A B-O/A C-C) | 1.12 0.62 1.79 | 1.42 0.74 1.92 | 1.06 0.52 2.04 | 1.23 0.72 1.71 |
Claims (4)
1. the preparation method of a modified phenolic resin with high boron content is characterized in that adopting two step method, and at first boric acid and phenol reactant generate boric acid ester, boric acid ester again with polyformaldehyde reaction, generate boracic modified resol; Its concrete steps are as follows:
(1) phenol and the 5～100ml organic solvent with 2～100g joins in the four-hole bottle that condenser, thermometer, electric agitator and thermopair are installed, be warming up to 40～150 ℃, add 2～70g boric acid then, regulate the pH value of solution in the four-hole bottle with alkali, when PH=6～8, this solution is reacted, vacuum decompression dehydration simultaneously under 40～150 ℃ temperature, reaction times is 1～6 hour, and vacuum tightness is 0.1～1KPa; Treat liquid clarification and be little when orange, stop pumping; The mol ratio of its mesoboric acid and phenol is 1/5～5/1;
(2) add the Paraformaldehyde 96 of 2～50g in the product that in step (1), obtains, under 40～150 ℃ of temperature, react, stir simultaneously, and decompression dehydration, reaction times is 1～8 hour, and the liquid in the reaction flask becomes sticky thick gradually, and is yellow-green colour, stopped reaction, cooling promptly gets desired product.
2. the preparation method of modified phenolic resin with high boron content according to claim 1 is characterized in that organic solvent is a kind of of toluene, ethanol, propyl alcohol, propyl carbinol, isopropylcarbinol, acetone, chloroform or tetrahydrofuran (THF) described in the step (1).
3. the preparation method of modified phenolic resin with high boron content according to claim 1 is characterized in that alkali is a kind of of basic metal, alkaline earth metal hydroxides or carbonate described in the step (1).
4. the preparation method of modified phenolic resin with high boron content according to claim 1 is characterized in that Paraformaldehyde 96 is a solid described in the step (2), and its molecular weight is 90～500.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100445310C (en) * | 2006-09-15 | 2008-12-24 | 中国科学院山西煤炭化学研究所 | Preparation method of boron modified phenolic resin |
| CN102127198A (en) * | 2011-01-13 | 2011-07-20 | 宁波卡利特新材料有限公司 | Method for preparing bisphenol A type boron phenolic resin |
| CN102321336B (en) * | 2011-08-11 | 2012-07-25 | 徐小波 | Thermal insulating and fireproof board for external wall |
| CN102321337A (en) * | 2011-08-11 | 2012-01-18 | 徐小波 | A kind of fire door core material plate |
| CN102492260B (en) * | 2011-11-29 | 2013-07-31 | 广东榕泰实业股份有限公司 | Ablation-resisting composite material resin composition and preparation method of ablation-resisting composite material |
| CN102952248B (en) * | 2012-10-30 | 2014-11-19 | 山东圣泉化工股份有限公司 | Modified phenol formaldehyde resin preparation method |
| CN103965424B (en) * | 2014-05-22 | 2016-03-09 | 陕西太航阻火聚合物有限公司 | A kind of high carbon residue thermosetting boron-containing phenolic resin and its preparation method and application |
| CN105001593B (en) * | 2015-07-06 | 2017-04-05 | 西北工业大学 | Suitable for the boron modified phenolic resin and preparation method of dry method prepreg moulding process |
| CN105418868B (en) * | 2015-12-10 | 2017-07-25 | 山东圣泉新材料股份有限公司 | Boron modified phenolic resin, preparation method and friction material |
| CN106928442B (en) * | 2017-05-10 | 2019-04-09 | 淄博联创聚氨酯有限公司 | Flame-proof polyol preparation method and its polyurethane foam and polyurethane foam preparation method of preparation |
| CN107513144A (en) * | 2017-07-26 | 2017-12-26 | 常熟东南塑料有限公司 | A kind of boron modified phenolic resin and preparation method thereof |
| CN108440900A (en) * | 2018-04-22 | 2018-08-24 | 唐林元 | A kind of high temperature resistant brake friction material |
| CN109679045B (en) * | 2018-12-27 | 2022-04-12 | 山东圣泉新材料股份有限公司 | Novel green reinforcing resin for tire rubber and composition thereof |
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Patent Citations (4)
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| JPS63156814A (en) * | 1986-12-22 | 1988-06-29 | Gunei Kagaku Kogyo Kk | Production of heat-resistant phenolic resin |
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