CN103318873A - Modification method for expandable graphite - Google Patents
Modification method for expandable graphite Download PDFInfo
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- CN103318873A CN103318873A CN2013101777817A CN201310177781A CN103318873A CN 103318873 A CN103318873 A CN 103318873A CN 2013101777817 A CN2013101777817 A CN 2013101777817A CN 201310177781 A CN201310177781 A CN 201310177781A CN 103318873 A CN103318873 A CN 103318873A
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Abstract
The invention relates to a modification method of expandable graphite (EG), and belongs to the technical field of inorganic materials. The method increases reactive functional groups on EG surface through use of a method of cladding or grafting, and then through use of the method of grafting introduces boric acid to improve carbon layer density degree and interface compatibility. The modification method of the expandable graphite has the advantages of simple preparation method, mild reaction conditions, easy-recycling waste liquids, and environmentally friendly production concept.
Description
Technical field
The present invention relates to a kind of method of modifying of expansible black lead, belong to technical field of inorganic material.
Background technology
Expansible black lead (EG) is a kind of compound between graphite layers, is mainly made through chemical oxidization method or electrochemical process by natural crystalline graphite.Because expansible black lead sharply expands when high temperature, flame can suffocate, the non-flammable gas that generates when expanding simultaneously plays the effect of dilution inflammable gas, and the foamed char of its generation covers substrate surface, played the effect of isolated heat and oxygen, therefore multiple fire-retardant approach makes it to have good flame retardant effect.Owing to the EG aboundresources, preparation technology is simple, and is cheap and nontoxic, thereby it is widely used in flame-proofed polymer material and frie retardant coating again.But also there are some problems in EG in as the application of fire retardant, as disperse not evenly, interface compatibility is poor causes " popcorn effect " during mechanical property worsens, combustion is charred to cause the loose and compactness of the charcoal layer that forms poor etc., the appearance of these problems has had a strong impact on the industrial applications of EG as fire-retardant for plastic.People's trial overcomes above-mentioned shortcoming to the method that EG carries out surface modification for this reason, and the main method that adopts has coating method and Graft Method.With regard to present research situation, no matter be to coat or Graft Method all is single solution consistency or disperses homogeneity, and the charcoal layer was loose and cause the poor problem of compactness not yet to see relevant modification report after EG expanded.
Summary of the invention
The objective of the invention is in order to propose a kind of method of modifying of expansible black lead, to solve the problem that the charcoal layer was loose and compactness is poor after EG expanded.
The objective of the invention is to be achieved through the following technical solutions.
The method of modifying of a kind of expansible black lead of the present invention, the method increase the reactive functionality on EG surface by the method for coating or grafting, then introduce compactness degree and the interface compatibility that boric acid improves the charcoal layer by the method for grafting, steps of the method are:
1) configuration A solution: EG is joined in the aqueous solution of alcohol, stir, then add silane coupling agent, utilizing acid to regulate the pH value is 3～7, and 1～12h is hydrolyzed;
2) configuration B solution: polyvinyl alcohol (PVA) is mixed with mass ratio 0.5～3:100 with water, soak 12～24h, then at 80～95 ℃ of lower heating 1～2h, make clear solution; EG is added in this clear solution, stir 0.5～1h, then it is evenly coated on the sheet glass, drying makes intermediate product C, and intermediate product C adding deionized water for stirring is even;
3) add boric acid in above-mentioned A solution or B solution, wherein the mass ratio of EG and boric acid is 100:2～15, stirring reaction 0.5-2h, and decompress filter, drying gets the modification expansible black lead.
Alcohol is 4～20:1 with the mass ratio of water in the aqueous solution of the alcohol described in the step 1); The mass ratio of EG and silane coupling agent is 100:1～5; EG is 1:1-4 with the mass ratio of the aqueous solution of alcohol;
Alcohol described in the step 1) is one or more the mixture in anhydrous methanol, dehydrated alcohol, anhydrous propyl alcohol, the anhydrous isopropyl alcohol;
Silane coupling agent in the step 1) is γ-aminopropyl triethoxysilane, γ-(2,3-epoxy the third oxygen) propyl trimethoxy silicane, γ-methacryloxypropyl trimethoxy silane, N-(β-aminoethyl)-a kind of in γ-aminopropyl front three (second) TMOS or the N-β-aminoethyl-γ-aminopropyl methyl dimethoxysilane;
Acid described in the step 1) is one or more the mixture in hydrochloric acid, phosphoric acid, oxalic acid, acetic acid, sulfuric acid, the carbonic acid;
Step 2) polyvinyl alcohol described in (PVA) is a kind of among PVA124, PVA1788, PVA1799, PVA1792, PVA NH-26 or the PVA EG-40;
Step 2) mass ratio of EG and clear solution is 1:2-4 in, and the mass ratio of intermediate product C and deionized water is 1:2-3;
Drying conditions described in the step 3) is 40～60 ℃ of temperature, and the time is 4～8h.
The particle diameter of described EG is 100 microns-500 microns.
The expand test of experiment and contact angle of the expansible black lead that aforesaid method is made.For the expansible black lead of the quality such as one species, the expansion height of sample is less, illustrates that the compactness after its expansion is better.The testing method of expansion height is: it is that 6mm, height are the test tube of 100mm that the modification expansible black lead is put into internal diameter, place retort furnace: homo(io)thermism is 350 ℃, be 20min storage period, takes out test tube, reads that the height of foamed char is expansion height in the test tube.The testing method of contact angle is: first the modification expansible black lead is pressed into sheet by powder compressing machine, selects polyether glycol to carry out the contact angle test as oil phase.Contact angle is less, illustrates that the interface compatibility of modification expansible black lead and polymer base material is better.
Beneficial effect
The present invention increases the hydroxy number on EG surface by silane coupling agent or PVA, then utilize boric acid easily and the character of polyol formation stable complex, the surface of boric acid being introduced EG.Because boric acid is the liquid state of thickness at hot stage, loose EG charcoal layer can be become fine and close, the simultaneously existence of silane coupling agent and PVA also can improve the interface compatibility of EG and base material.
Modification expansible black lead preparation method provided by the invention is simple, and reaction conditions is gentle, and waste liquid is easy to recycle, and meets the theory that environmental protection is produced.The experiment proved that, adopt the modification expansible black lead of the present invention's preparation, the compactness of charcoal layer is improved, and is improved with the consistency of macromolecular material.Expansible black lead after the modification can further improve the flame retardant properties of material because the charcoal layer that forms is high temperature resistant and fine and close, and therefore, such modification expansible black lead has good application prospect in plastic applications.
Embodiment
Following embodiment is used for further describing the present invention, but does not limit in any form the present invention.
Embodiment 1
The 20g expansible black lead is added in the 45g aqueous ethanolic solution, wherein the mass ratio of dehydrated alcohol and water is 9:1, stir 15min, then add 0.6g γ-methacryloxypropyl trimethoxy silane (KH-570), splashing into the salt acid for adjusting pH value in the whipping process is 3.5 o'clock, continue again stirring reaction 1h, then add 2.0g boric acid, stirring reaction 1h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 61mm, and contact angle is 23 °.
Embodiment 2
The 20g expansible black lead is added in the 45g aqueous ethanolic solution, wherein the mass ratio of dehydrated alcohol and water is 9:1, stir 15min, then add 0.5g γ-aminopropyl triethoxysilane (KH-550), stir 2.5h, then add 2.0g boric acid, stirring reaction 2h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 56mm, and contact angle is 23 °.
Embodiment 3
The 20g expansible black lead is added in the 45g aqueous ethanolic solution, wherein the mass ratio of dehydrated alcohol and water is 9:1, stir 15min, then add 0.2g γ-aminopropyl triethoxysilane (KH-550), stir 2h, then add 1.0g boric acid, stirring reaction 1h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 63mm, and contact angle is 22 °.
Embodiment 4
The 20g expansible black lead is added in the 45g aqueous ethanolic solution, wherein the mass ratio of dehydrated alcohol and water is 9:1, stir 15min, then add 0.2g γ-aminopropyl triethoxysilane (KH-550), stir 1h, then add 0.5g boric acid, stirring reaction 2h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 64mm, and contact angle is 23 °.
Embodiment 5
The 20g expansible black lead is added in the 45g aqueous ethanolic solution, wherein the mass ratio of dehydrated alcohol and water is 9:1, stir 15min, then add 0.2g γ-aminopropyl triethoxysilane (KH-550), stir 1.5h, then add 2.0g boric acid, stirring reaction 1h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 61mm, and contact angle is 24 °.
Embodiment 6
Take by weighing 0.6g PVA124 adding and fill in the flask of 65g deionized water, soak 24h, then at 90 ℃ of lower heating 2h, be transparence liquid.The 20g expansible black lead is added in the flask, stir 30min, then discharging, spread upon uniformly on the sheet glass, 50 ℃ of dry 3h obtain intermediate product C, and intermediate product C is added in the 40g deionized water, mix, then add 2.0g boric acid, stirring reaction 1h, decompress filter, 50 ℃ of lower dry 4h make the modification expansible black lead.The particle diameter of EG is 200 microns.
The modification expansible black lead that obtains is tested, and recording expansion height is 60mm, and contact angle is 22 °.
Comparative Examples: the expansible black lead before the modification is as contrast, experiment and the contact angle test of expanding, and the result is respectively: expansion height is 65mm, contact angle is 26 °.
Claims (4)
1. the method for modifying of an expansible black lead is characterized in that steps of the method are:
1) configuration B solution: polyvinyl alcohol is mixed with mass ratio 0.5～3:100 with water, soak 12～24h, then at 80～95 ℃ of lower heating 1～2h, make clear solution; EG is added in this clear solution, stir 0.5～1h, then it is evenly coated on the sheet glass, drying makes intermediate product C, and intermediate product C adding deionized water for stirring is even;
2) add boric acid in the B solution that step 1) obtains, wherein the mass ratio of EG and boric acid is 100:2～15, stirring reaction 0.5-2h, and decompress filter, drying gets the modification expansible black lead.
2. the method for modifying of a kind of expansible black lead according to claim 1 is characterized in that: the polyvinyl alcohol described in the step 1) is a kind of among PVA124, PVA1788, PVA1799, PVA1792, PVA NH-26 or the PVA EG-40.
3. the method for modifying of a kind of expansible black lead according to claim 1, it is characterized in that: the mass ratio of EG and clear solution is 1:2-4 in the step 1), the mass ratio of intermediate product C and deionized water is 1:2-3; The particle size range of EG is 100 microns-500 microns.
4. the method for modifying of a kind of expansible black lead according to claim 1 is characterized in that: step 2) described in drying conditions be 40～60 ℃ of temperature, the time is 4～8h.
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| CN201310177781.7A CN103318873B (en) | 2013-05-14 | 2013-05-14 | Modification method for expandable graphite |
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| CN201310177781.7A CN103318873B (en) | 2013-05-14 | 2013-05-14 | Modification method for expandable graphite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649224A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Expanded graphite/LiBH4 composite hydrogen storage material and preparation method thereof |
| CN106284712A (en) * | 2016-08-15 | 2017-01-04 | 马常芳 | A kind of nanometer strengthens polyurethane foam and foam cement composite insulation boards |
| CN106337506A (en) * | 2016-08-15 | 2017-01-18 | 马常芳 | Fireproof foaming cement injection molding polyurethane composite insulation board |
| CN107117929A (en) * | 2017-06-14 | 2017-09-01 | 合肥市旺友门窗有限公司 | A kind of external wall insulation and preparation method thereof |
| CN107641221A (en) * | 2016-07-22 | 2018-01-30 | 武汉理工大学 | A kind of hydroxide-modified expansible graphite fire retardant and preparation method thereof |
| CN114057499A (en) * | 2021-12-18 | 2022-02-18 | 江苏盛耐新材料有限公司 | Sliding plate brick and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1094379A (en) * | 1993-04-23 | 1994-11-02 | 清华大学 | Intensified flexible graphite and manufacture method thereof |
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2013
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094379A (en) * | 1993-04-23 | 1994-11-02 | 清华大学 | Intensified flexible graphite and manufacture method thereof |
Non-Patent Citations (2)
| Title |
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| 汪则灵等: "阻燃聚乙烯醇的高效化与清洁化研究", 《河南科技》, no. 1, 31 December 2010 (2010-12-31), pages 37 - 39 * |
| 郝建薇等: "膨胀石墨的表面改性及其在PIR-RPUF 中的应用", 《塑料》, vol. 35, no. 1, 31 December 2006 (2006-12-31), pages 14 - 17 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649224A (en) * | 2015-02-06 | 2015-05-27 | 桂林电子科技大学 | Expanded graphite/LiBH4 composite hydrogen storage material and preparation method thereof |
| CN107641221A (en) * | 2016-07-22 | 2018-01-30 | 武汉理工大学 | A kind of hydroxide-modified expansible graphite fire retardant and preparation method thereof |
| CN106284712A (en) * | 2016-08-15 | 2017-01-04 | 马常芳 | A kind of nanometer strengthens polyurethane foam and foam cement composite insulation boards |
| CN106337506A (en) * | 2016-08-15 | 2017-01-18 | 马常芳 | Fireproof foaming cement injection molding polyurethane composite insulation board |
| CN107117929A (en) * | 2017-06-14 | 2017-09-01 | 合肥市旺友门窗有限公司 | A kind of external wall insulation and preparation method thereof |
| CN114057499A (en) * | 2021-12-18 | 2022-02-18 | 江苏盛耐新材料有限公司 | Sliding plate brick and preparation method thereof |
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| CN103318873B (en) | 2015-02-25 |
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