CN1273952A - Modified polymer microfibres for high-performance concrete and preparing process thereof - Google Patents
Modified polymer microfibres for high-performance concrete and preparing process thereof Download PDFInfo
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- CN1273952A CN1273952A CN 99114862 CN99114862A CN1273952A CN 1273952 A CN1273952 A CN 1273952A CN 99114862 CN99114862 CN 99114862 CN 99114862 A CN99114862 A CN 99114862A CN 1273952 A CN1273952 A CN 1273952A
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Abstract
A modified polymer microfibre with down on its surface used for high-performance concrete and mortar is composed of main fibre body and surficial coupling agent layer and is modified by coating, high-energy ray radiation and coupling. Its advantages include high dispersity and adhesion in concrete and mortar, and high effect on the improvement of concrete or mortar performance.
Description
The present invention relates to be used for the concrete polymer microfibers modification technology of high performance.Polymer microfibers after the modification can improve concrete over-all properties greatly as concrete less important stiffening web.
Is the mid-80 with polymer microfibers as concrete Additive, by septic yanks engineerings group at first development and Application and Development.Primitive fiber is as a kind of accessory concrete strengthening system, and its biggest advantage is to alleviate concrete plasticity be full of cracks significantly, improves concrete over-all properties.English Patent GB1130612 has proposed to replace traditional fortifying fibre to split the film polypropylene fibre.Because polypropylene has good erosion resistance, can adhere mutually with cement matrix, so demonstrate the characteristic that fortifying fibre is used, but polypropylene split-film fibre smooth surface, with the mixed difficult dispersion of cement, the part produces agglomerating phenomenon, thereby has influenced the performance of the reinforced effects of polypropylene split-film fibre.42617542 couples of English Patent GB1130612 of U.S. Pat improve, promptly earlier that split-film fibre and neat portland cement is mixed at a high speed, make it in cement, be able to homodisperse, adding sand, water mix again afterwards, casting reaches the purpose of improvement thus.Yet, the fibrosis of split-film fibre be by means of the high-speed stirring of it and plain cement and and realize, strict like this mixing with two steps is mixed, brings many difficulties and inconvenience to building operation, and the fibrosis of polypropylene split-film fibre and the also difficult control of dispersing uniformity.The patent publication No. of Hushan Industrial Group Co., Ltd., Shandong Prov is that the patent of CN1152054A has been done further improvement to above 2 kinds of patents, promptly in spinning process, add the brilliant nucleator of polypropylene beta, the surface that makes its formation is become to saving granular uneven surface by original smooth surface, and to make the cross section of fiber be that bifurcation shape is to increase its surface in contact.The polypropylene fibre of this patented technology processing, dispersed in concrete and improvement is all arranged with concrete mutual clinging power, the concrete of processing and fabricating, its over-all properties also is improved to some extent.But because the roughness on primitive fiber surface is also not high, with the direct acting fiber surface of concrete still be polypropylene fibre, and polypropylene fibre itself has hydrophobicity, incompatible with polar material, therefore, dispersiveness in concrete and all not high with concrete mutual adhesion bond stress, also not ideal enough with its concrete over-all properties that is processed into.And the shape of fiber surface is to form smoking in the process of spinning of fiber, obtain this fiber, facility investment expense height.
The objective of the invention is at the weak point of prior art and to disclose a kind of high performance that is used for to people concrete, the surfaceness height, can avoid the direct and mutual sticking action of cement of polymer fiber, dispersing property is good, polymer-modified primitive fiber and production method thereof that the bond stress of adhering mutually is strong.
The concrete polymer-modified primitive fiber of high performance that is used for of realizing the foregoing invention purpose is made of polymer microfibers body and the connection agent that is coated on its surface, and fiber surface is the fine hair shape.Said polymer fiber can be polypropylene fibre, trevira, carbon fiber, nylon fiber etc.
Produce the above-mentioned method that is used for the concrete polymer-modified primitive fiber of high performance: be that 0.03～20.0% connection agent solution is coated on polymeric fiber surface 1. with concentration; 2. the energetic ray with 0.05～7.00 megarad carries out irradiation to polymer fiber; Irradiation time is 30～600 seconds.
In order to realize purpose of the present invention better, also can further take following technical measures:
To having applied the polymer fiber that connects agent solution, be 1.00～10.00% with concentration again, pH value is 2～6 coupling agent solution immersion, many 10 minutes of soak time.Carry out drying treatment after the taking-up.
The fiber that takes out from coupling agent solution preferably carries out spin-dry earlier, and placing temperature again is to dry in 50～160 ℃ the baking oven.
Connect agent and can adopt C
8～C
18Alkylphosphonic acid carboxylic acid an alkali metal salt, olefin monomer, maleic anhydride, SiCl
4Deng in a kind of, perhaps be wherein two or more mixtures.
The method that the connection agent solution is coated on polymeric fiber surface can adopt spraying or soak cladding process.
Coupling agent can adopt a kind of in titanic acid ester, siloxanes, the phosphoric acid ester etc., perhaps is wherein two or more mixtures.
Connection agent solution, coupling agent solution are the aqueous solution.
Polymer fiber has hydrophobicity, and is difficult compatible with polar material, therefore, do not have the dispersiveness of polymer fiber in concrete of modification, all poor with concrete mutual adhesion bond stress.The present invention is by applying the agent of one deck matter in polymeric fiber surface, polymer fiber is interacted by connecting agent material and concrete, its dispersed in cement and be improved with concrete adhesion bond stress also is significantly improved with the cement concrete over-all properties of its processing and fabricating.The present inventor carried out the contrast experiment, and blending is through coating modified polymer fiber in cement concrete, and without coating modified polymer fiber, the folding strength of cement concrete improves 30% than blending, and tensile strength improves 20%.
With energetic ray the polymer fiber through coating modified processing is carried out irradiation, can make some group and atom in the polymer fiber generate macromolecular radical, cause formation grafted high molecular polymer and form new covalent linkage, thereby the connection agent of low-molecular material and the firm degree of bonded between the polymer fiber macromole have been improved greatly, the grafting of fiber can reach 5-10%, its tensile strength can improve 20-30%, the surface of fiber also becomes very coarse simultaneously, the surface is the fine hair shape, surface-area also increases greatly, dispersiveness in cement concrete and bond stress mutual with it also further increase, and then have improved the over-all properties of cement concrete.Blending is through polymer fiber coating modified, that the high-energy ray irradiation modification is handled in cement concrete, and only through the polymer fiber of coating modified processing, the folding strength of cement concrete can improve 20-30% than blending, and tensile strength improves 50%.
To be soaked in the coupling agent solution through polymer fiber coating modified, that the x radiation x modification was handled, the performance of fiber can be further improved.Through the polymer fiber that coupling agent treatment is crossed, the side chain degree of its percentage of grafting and grafting molecule can both be further improved, thereby has also further strengthened fiber and concrete bond stress, has reached the ideal reinforced effects.Experiment showed, that polymer fiber is used for cement concrete through coupling modification processing again, be used for cement concrete than the polymer fiber of not handling through the coupling modification, the folding strength of cement concrete improves 10%, and tensile strength improves 20%.
The present invention to polymer fiber take coating modified, three major technique measures of radiation modification and coupling modification, wherein each technical measures all can be improved the dispersiveness of polymer fiber in concrete, improve and concrete bond stress, thus the over-all properties of improvement cement concrete.And these three technical measures all can be implemented separately, and each measure all can obtain corresponding effects.These three technical measures are on the enforcement order, and applying modification should at first implement, and x ray irradiation x and coupling agent treatment do not have strict restriction on the enforcement order, but preferably x ray irradiation x preceding, coupling agent treatment after.
The present invention discloses is used for the concrete polymer fiber of high performance, and the surface scribbles one deck and connects agent, connects agent and combines with fiber by chemical bond, and top coat is very firm, and the surface of product fiber is very coarse, is the fine hair shape.The present invention compared with prior art, polymer fiber is by connecting agent coating and the effect of the coagulating cement soil phase, overcome polymer fiber because hydrophobicity, be difficult for the compatible bad dispersibility of bringing with polar material, difficult problems such as bond stress is not strong, improve the affinity of polymer fiber and cement greatly, improved the over-all properties of cement concrete.Disclosed fiber, production performance is good, steady quality, technology is easy to promote, and can carry out scale operation.
Provide embodiments of the invention below:
Embodiment 1
(1) coating modified processing.With toxilic acid and water be equipped to concentration be 1.00% connect the agent aqueous solution, it is 15mm that the connection agent aqueous solution is coated on length in the mode of spraying coating, Fibre diameter is 0.03-0.05mm, fibre tensile strength is 650mPa, the elongate fiber rate is 18% polypropylene fibre surface, makes fiber surface coat one deck and connects agent solution.
(2) the high-energy ray irradiation modification is handled.To the polypropylene fibre of handling through above-mentioned the first step modification, be that the energetic ray of 2.5 megarads carries out irradiation with dosage, irradiation time is about 30 seconds.
(3) the coupling modification is handled.Will be through the polypropylene fibre of above-mentioned two steps modifications processing, being soaked in the concentration that is mixed with by titanic acid ester and water is 2.0%, pH value is 3 coupling agent aqueous solution, soaks about 18 minutes.
(4) oven dry is handled.The fiber that takes out from coupling agent aqueous solution places centrifuge dewatering to dry, and placing temperature after the taking-up again is about 100 minutes of baking oven inner drying about 80 ℃, takes out and is product.
By above-mentioned 4 polypropene staples that step processes, its surface has one deck to connect agent, is the fine hair shape, promptly can be used as high performance concrete polypropylene fibre.
Embodiment 2
(1) coating modified processing.Use SiCl
4With water be mixed with concentration be 15% connect the agent aqueous solution, it is 30mm that the connection agent aqueous solution is coated on length in the mode that sprays, and diameter is 0.03-0.05mm, and fibre tensile strength is 650MPa, elongation is 18% polypropylene fibre surface, makes fiber surface coat one deck and connects agent solution.
(2) the high-energy ray irradiation modification is handled.To the polypropylene fibre of handling through above-mentioned the first step modification, be that 5.00 million energetic rays that draw carry out irradiation with dosage, irradiation time was about about 5 seconds.
(3) the coupling modification is handled.To be soaked in the concentration that is mixed with by phosphoric acid ester and water through the polypropylene fibres that above-mentioned two step modifications are handled and be 8.0%, pH value is 5 coupling agent aqueous solution, soaked about 15 minutes.
(4) oven dry is handled.The fiber that takes out from coupling agent aqueous solution places the whizzer spin-dry, and placing temperature after the taking-up again is about 90 minutes of oven drying about 150 ℃, takes out and is product.
By above-mentioned 4 polypropene staples that step processes, its surface has one deck to connect agent, and the surface is the fine hair shape, promptly can be used as the high performance concrete polypropylene fibre.
Claims (9)
1. the polymer-modified primitive fiber of high performance concrete is characterized in that being made of polymer fiber body and the connection agent that is coated on its surface, and fiber surface is the fine hair shape.
2. the polymer-modified primitive fiber of high performance concrete according to claim 1 is characterized in that polymer fiber can be polypropylene fibre, trevira, carbon fiber, nylon fiber etc.
As claim 1 and 2 described high performance concrete with the production method of polymer-modified primitive fiber, it is characterized in that: (1) is that 0.03～20.0% connection agent solution is coated on the polymer microfibers surface with concentration; 2. the energetic ray with 0.05～7.00 megarad carries out irradiation to the polymer microfibers through coating processing, and irradiation time is 30 seconds to 600 seconds.
4. high performance concrete according to claim 3 is with the production method of polymer-modified primitive fiber, having it is characterized in that applying the polymer fiber concentration that connects agent is 1.00～10.00%, pH value is 2～6 coupling agent solution immersion, soak time is no less than 10 minutes, carries out drying treatment after the taking-up.
5. high performance concrete according to claim 4 carries out spin-dry earlier after it is characterized in that taking out with the production method of polymer-modified primitive fiber from coupling agent solution, placing temperature then is to dry in 50～160 ℃ the baking oven.
According to claim 3 or 4 or 5 described high performance concrete with the production method of polymer-modified primitive fiber, it is characterized in that said connection agent is C
8～C
18Alkylphosphonic acid carboxylic acid alkali gold salt, olefin monomer, maleic anhydride, SiCl
4Deng in a kind of, perhaps for wherein being no less than two kinds mixture.
7. according to claim 3 or 4 or 5 described high performance concrete production method, it is characterized in that connecting that agent solution adopts spraying or the mode of soaking is coated on the surface of polymer fiber with polymer-modified primitive fiber.
8. according to claim 4 or 5 described high performance concrete production method, it is characterized in that said coupling agent is a kind of in titanic acid ester, siloxanes, the phosphoric acid ester etc., perhaps for wherein being no less than two kinds mixture with polymer-modified primitive fiber.
According to claim 3 or 4 described high performance concrete with the production method of polymer-modified primitive fiber, it is characterized in that said connection agent solution and coupling agent solution are the aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114862 CN1273952A (en) | 1999-05-14 | 1999-05-14 | Modified polymer microfibres for high-performance concrete and preparing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114862 CN1273952A (en) | 1999-05-14 | 1999-05-14 | Modified polymer microfibres for high-performance concrete and preparing process thereof |
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| CN1273952A true CN1273952A (en) | 2000-11-22 |
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| CN 99114862 Pending CN1273952A (en) | 1999-05-14 | 1999-05-14 | Modified polymer microfibres for high-performance concrete and preparing process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880314A (en) * | 2014-02-23 | 2014-06-25 | 中国科学院福建物质结构研究所 | Forming method for fiber-reinforced concrete |
| US10131579B2 (en) | 2015-12-30 | 2018-11-20 | Exxonmobil Research And Engineering Company | Polarity-enhanced ductile polymer fibers for concrete micro-reinforcement |
| CN109095862A (en) * | 2018-09-25 | 2018-12-28 | 李鹏宇 | A kind of high-strength tenacity concrete |
| US10717673B2 (en) | 2015-12-30 | 2020-07-21 | Exxonmobil Research And Engineering Company | Polymer fibers for concrete reinforcement |
-
1999
- 1999-05-14 CN CN 99114862 patent/CN1273952A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880314A (en) * | 2014-02-23 | 2014-06-25 | 中国科学院福建物质结构研究所 | Forming method for fiber-reinforced concrete |
| CN103880314B (en) * | 2014-02-23 | 2018-04-10 | 中国科学院福建物质结构研究所 | A kind of forming method of fibre reinforced concrete |
| US10131579B2 (en) | 2015-12-30 | 2018-11-20 | Exxonmobil Research And Engineering Company | Polarity-enhanced ductile polymer fibers for concrete micro-reinforcement |
| US10717673B2 (en) | 2015-12-30 | 2020-07-21 | Exxonmobil Research And Engineering Company | Polymer fibers for concrete reinforcement |
| CN109095862A (en) * | 2018-09-25 | 2018-12-28 | 李鹏宇 | A kind of high-strength tenacity concrete |
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