CN101139414A - Method for synthesizing carboxyl butadiene-styrene latex improving concrete tensile strength - Google Patents
Method for synthesizing carboxyl butadiene-styrene latex improving concrete tensile strength Download PDFInfo
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Abstract
The present invention relates to a synthetic method for carboxylated styrene-butadiene latex with improved concrete bending and tensile strength through the preparation method of conjugated dienes - styrene copolymer. The preparation method involves 30 to 50 shares of butadiene or isoprene isoprene, 40 to 55 shares of styrene, 1 to 3 shares of acrylonitrile, 1 to 4 shares of N-hydroxymethylin acrylamide, 0.1 to 5 shares of methyl acrylate, 1 to 5 shares of itaconic acid, 4 to 12 shares of acrylic n-butyl, 1.0 to 2.0 shares of emulsifier, 0.4 to 1.0 shares of potassium persulphate, 0.1 to 0.8 shares of molecular weight regulator, 0.01 to 0.5 shares of pH buffer agent, 0.01 to 5 shares of potassium phosphate, 0.01 to 5 shares of chelator and 100 to 150 shares of soft water; In the polymerization reaction, monomer and a variety of agents are added with intermission. And reaction temperature control adopts the two-step laddered control. When the conversion rate reaches 99.0 percent, the mixture experiences the vacuum degassing treatment. The present invention has the advantages of low cost, strong bonding, easy mixing with the cement, convenient construction and fast film forming at room temperature. The present invention prolongs the service life of the road and reduces the brittle fracture surface of the road. Small amount of improved styrene-butadiene latex added to the road concrete can reduce the water content of the road surface, and strengthen and toughen the road.
Description
Technical field
The present invention relates to a kind of synthetic method that improves the carboxylic styrene butadiene latex of concrete tensile strength with the synthetic method preparation of the hot method letex polymerization of styrene-butadiene latex conjugated diene-styrol copolymer.
Background technology
External concrete modifying is with in the production of styrene-butadiene latex, and vinylbenzene, divinyl are the polymerization main monomer, and the monobasic unsaturated carboxylic acid is the 3rd function monomer, feeding manner of most employings.The different formed performance of copolymer with the divinyl proportioning of vinylbenzene that adopt are different.As D623 pavement concrete modification latex, its vinylbenzene is 65: 35 with the ratio of divinyl; B1603 latex is used for cement group water-proofing material, and its vinylbenzene and divinyl were than 30: 70.The combined styrene amount is higher than 60%, and then film-forming is slower at normal temperatures for latex, and forms the film of hardened resin character.When being used for modified cement mortar, styrene content is that the latex over-all properties of 60-65% is good.Styrene content is too high, though can improve resistance to compression and tensile strength, has reduced cementability and bending property.If be used as the 3rd function monomer with unsaturated carboxylic acid or esters of unsaturated carboxylic acids, its add-on can make carboxylic styrene butadiene latex with respect to the 3-10% of vinylbenzene, the total consumption of divinyl.Emulsifying agent amount ranges broad generally is 1%-5%.Trend towards adopting low soap or soap-free emulsion method to carry out polyreaction at present.For example in recent years, Japanese JSR company had developed and has contained emulsification dosage and improve the exploitation of methyl ethyl ketone plant butylene utilization ratio Technology less or do not contain emulsifying agent and the concrete modifying carboxylic styrene butadiene latex good with the concrete miscibility.The general persulphate thermolysis type initiator that adopts carries out polymerization, and polymerization temperature 80-85 ℃, initiator amount is 0.15-1.0%.From foreign patent, preparation concrete and sand-cement slurry mainly contain with the synthetic technology of styrene-butadiene latex: 1. pyroprocess.In under the low soap composite emulsifying system, 78 ℃-85 ℃ of polymeric reaction temperatures; 2. middle warm therapy.Under high soap composite emulsifying system, 40 ℃-65 ℃ of polymeric reaction temperatures; 3. low temperature process.Under the fatty acid soaps emulsification system, 5 ℃-30 ℃ of polymeric reaction temperatures, oxidation-reduction trigger system.External relevant patent principal feature is: by selecting suitable butylbenzene ratio and other function monomers, come the second-order transition temperature of controlling polymers.Adopt the monobasic unsaturated carboxylic acids as the 3rd function monomer more, so that polymkeric substance has certain chemical reactivity and hydrophilicity or other properties.Emulsification system adopts anionic emulsifier, and consumption is higher, is trending towards adopting macromolecule emulsifier and reactable emulsifying agent at present.Initiator system adopts persulphate thermal initiation system more.The polymerization formula scope of patent protection mainly is emulsifying agent kind and consumption, additive synthesis kind and consumption.United States Patent (USP) is introduced, and uses components composition latex cement systems such as styrene-butadiene latex and cement, can effectively prevent the seepage of water or other fluid, and this system can be used in the buildings and the waterproof of bridge culvert, tunnel, road etc.Increase the non-deformability of cement system.Improve the bonding force of latex cement system etc., point out that the second-order transition temperature of polymkeric substance and its application performance have very big relation, the particle diameter of latex is between 100-250nm.Japanese Patent is introduced, and adds in divinyl and vinylbenzene and contains benzene sulfonamide acids tensio-active agent, and the anionic latex that a spot of monocarboxylic acid, silane coupling agent are made adds in cement plaster or the concrete can improve its physicals and processing characteristics.Conjugated diolefin monomer and other monomers and unsaturated carboxylic acid class monomer are carried out letex polymerization.Institute's synthetic latex adds in the cement with the ratio of 5-30wt.%, and the cement number of dropouts is reduced, and bounding force strengthens.German Patent has been introduced a kind of method for preparing stable carboxylic styrene butadiene latex (solids content is greater than 50%).The latex residual monomer content that obtains is low, the big and narrow distribution range of particle diameter, and in conjunction with the carboxylic acid content height, whipability is low.Product is as concrete or sand-cement slurry properties-correcting agent.Adopting the butylbenzene ratio is 20～80/30～70, adopts as H (CH
2)
d(OC
2H
4)
eSO
3The particular emulsifier of X makes the styrene-butadiene latex that a kind of concrete modifying is used.Domestic rubber latex and the epoxy resin glues such as polychloroprene latex, propyl benzene latex of aspect modified cement, mainly adopting, for example the chloroprene rubber of Sichuan Changshou General Chemical Plant production can be used for modified cement, its technical indicator is: total solid substance (%) 〉=48, pH 〉=11, relative density 〉=1.1, viscosity (MPa.s)≤40, cross-linked rubber tensile strength (MPa) 〉=15, elongation (%) 〉=800, crystallization velocity is slow, and the latex shelf lives (15-25 ℃) is more than 8 months; The YS-101 latex of High Polymer Inst., Fujian Normal Univ.'s development is used for cement and timber, timber and adhesive bonding of wood, the cohesive strength of timber and concrete interface (was solidified 24 hours, room temperature) is 2.7MPa, room temperature condition solidifies 168 hours cohesive strength 3.2MPa down, handles 72 hours cohesive strength 2.9MPa under 95% humidity.CN1106445A introduces and uses the synthetic styrene butadiene latex modified sand-cement slurry of single anion emulsifying agent.CN1208737A has introduced a kind of method of high-stability carboxylic butadiene-styrene latex modified cement mortar, is mainly used in finishing material.Monomer and auxiliary agent that above technology adopts are of a great variety, cost an arm and a leg, and are unfavorable for applying at home.
Summary of the invention
The objective of the invention is to adopt ordinary emulsion polymeric method, reduce monomer and auxiliary agent kind and consumption, synthesize and be used for the pavement concrete modification, improve service life of road surface, reduce road surface base metal plate brittle failure, improve the carboxylic styrene butadiene latex of concrete tensile strength, add a small amount of modification in the pavement concrete and can play diminishing, enhancing and toughness reinforcing effect to concrete with styrene-butadiene latex.
This purpose is realized by following scheme:
(1) synthetic components in mass portion proportioning is as follows:
Divinyl or isoprene 30-50 part, vinylbenzene 40-55 part, vinyl cyanide 1-3 part, N hydroxymethyl acrylamide 1-4 part, methacrylic acid 0.1-5 part, methylene-succinic acid 1-5 part, n-butyl acrylate 4-12 part, emulsifying agent 1.0-2.0 part, initiator potassium persulfate 0.4-1.0 part, molecular weight regulator tert-dodecyl mercaptan or dodecyl mercaptan carbon 0.1-0.8 part, pH value buffer reagent sodium bicarbonate 0.01-0.5 part, potassiumphosphate 0.01-5 part, sequestrant tetrasodium ethylenediamine tetraacetate or disodium ethylene diamine tetraacetate 0.01-5 part and soft water 100-150 part;
Emulsifying agent is in anionic emulsifier Seconary Alkane Sulphonate Sodium and/or sodium lauryl sulphate and nonionic emulsifying agent phenolic group in ninth of the ten Heavenly Stems Soxylat A 25-7 and/or the sodium formaldehyde condensation products at least three kinds compound, and negatively charged ion is 1: 1 with the ratio of nonionic consumption;
(2) polymerization technique:
Polymeric kettle vacuumizes the back and drops into soft water, emulsifying agent, molecular weight regulator, pH buffer reagent and partial monosomy, charging capacity is 20-80%, after being warmed up to 50-55 ℃, add the part initiator, temperature of reaction is 63 ± 1 ℃, reacted 3 hours, temperature of reaction is increased to 67 ± 1 ℃, reacted 9 hours, react when transformation efficiency reaches the 60-90% of monomer total amount, add leftover materials and initiator, when transformation efficiency reaches 99.0% of monomer total amount, rubber cement carries out vacuum outgas to be handled, and degassing temperature is between 40～80 ℃, best 50～70 ℃, vacuum tightness-0.06-0.09MPa, best-0.07-0.08MPa, degassing back residual styrene content is at 0～500ppm, reach between the 7-9 with alkali lye impregnation breast pH value, cool to 30-50 ℃ after discharging pack.
Advantage of the present invention:
(1) be initiator with the persulphate, because the resolvent of persulphate is soluble in water, do not need reductive agent, avoided the use organo-peroxide to make initiator, its resolvent remains in the glue, the pollution that causes;
(2) replace low temperature polymerization with high temperature polymerization, reduce energy consumption, high temperature polymerization needs heating (polymkeric substance per ton to be needed 6.54 * 10 approximately except that the initial reaction stage material is raised to polymeric reaction temperature by normal temperature
1Kcal) outside, keeping and improving of later temperature of reaction then can be replenished by polymerization reaction heat; Require the expenditure of energy and low temperature polymerization not only drops to polymeric reaction temperature (as 5 ℃) with material by normal temperature, and need remove a large amount of polymerization reaction heats, these two promptly reach 37 * 10
4Kcal;
(3) improve polymerization conversion, reduce and reclaim amount of monomer, transformation efficiency rises to 97% from 95%, reclaims amount of monomer and can reduce more than three times, and this not only reduces energy expenditure, and significantly reduces the chance that pollutes;
(4) adopt monomer and conditioning agent gradation to add technology, not only can improve transformation efficiency, and make monomer evenly increase chain; The latex that uses the present invention to produce, when carrying out the coating preparation, the consistency of auxiliary agents such as latex and pigment is good, flowability, water-retentivity, the mechanical stability excellence of coatings formulated under shear conditions.
(5) concrete tensile strength after the latex modified provided by the invention can be greater than 5MPa, its resistance to impact shock can improve 1-5 doubly, bending tensile strength improves 2-4 doubly, wear resistance improves 1-5 doubly, water tolerance and weathering resistance also have raising, pavement concrete modification styrene-butadiene latex and other concrete modifying agent such as EVA, MBR etc. compare, have cheap, cohesive force is strong, easily and the cement blending, easy construction, but advantage such as fast filming at normal temperatures, can be used for high grade highway pavement, the ordinary highway road surface, the laying of People's Bank of China's bridge floor, and can be used for the joint seal and the fissured repairing of buildings and highway.Be used for the pavement concrete modification, improved service life of road surface, reduced road surface base metal plate brittle failure, add a small amount of modification in the pavement concrete and can play diminishing, enhancing and toughness reinforcing effect to concrete with styrene-butadiene latex.
Embodiment
Following part is a mass parts; Hundred parts of ratios are all in the monomer total amount.
Embodiment 1:
(1) latex production
1) process that feeds intake: stir at a band, import and export of nitrogen, material import and export, (polymeric kettle at first vacuumizes in the 10L polymeric kettle of thermometric pressure tap and chuck, use nitrogen replacement again, vacuum tightness reaches-during 0.10MPa) drop into 63 parts of soft water in mass successively, (wherein soft water is 10 parts for emulsifier solution, 0.8 part of H-95, the ninth of the ten Heavenly Stems, phenolic group Soxylat A 25-7 TX-12 was 0.6 part, the sodium formaldehyde condensation products is 0.2 part), potassiumphosphate, sodium bicarbonate, totally 0.9 part of EDTA four sodium solution, 1 part of Potassium Persulphate, 22 parts of vinylbenzene, 0.2 part of n-dodecyl mercaptan, 1 part of methacrylic acid, 1 part of methylene-succinic acid, 4 parts of n-butyl acrylates, 0.8 part of vinyl cyanide, 0.8 part of N hydroxymethyl acrylamide, 14 parts of divinyl, 20 parts of vinylbenzene, begin then to heat up, when temperature of reaction reaches 50 ℃, add initiator solution (12 parts of soft water).
2) reaction is controlled and is added: 55 ± 2 ℃ of controlled temperature, keep about 2 hours of reaction, when transformation efficiency reaches 75%-90% in the monomer total amount, add and add liquid for the second time, wherein soft water in mass is 15 parts, H-950.3 part, the ninth of the ten Heavenly Stems, phenolic group Soxylat A 25-7 TX-12 was that 0.2 part, sodium formaldehyde condensation products are 0.1 part, 0.2 part of n-dodecyl mercaptan, 2 parts of methacrylic acids, 2 parts of methylene-succinic acids, 8 parts of n-butyl acrylates, 1.2 parts of vinyl cyanide, 1.2 parts of N hydroxymethyl acrylamides, 0.2 part of Potassium Persulphate, 33 parts of vinylbenzene, 19 parts of divinyl.Be warming up to 65 ± 2 ℃ keep reaction until polymerisation conversion in the monomer total amount greater than 97%.
(2) remove residual monomer and aftertreatment: transformation efficiency reaches 97% when above in the monomer total amount, stopped reaction, in degassing still vacuum tightness is under the condition of 60 ℃ of 0.10MPa, still temperature, changes latex over to the still that outgases and removes residual monomer, and the degassing time is 1.5-3.0 hour.Slowly add 20% alkali lye then and regulate the pH value, make it between 7-9.Pack after filtering at last.
(3) physical index of latex
7.2 ℃ of structural gel of total solid substance 48.8% pH value, 7.85 viscosity 65mPas surface tension 41mN/m particle diameter 211.8nm mechanical stability 0.08% chemical stability, 0.09% second-order transition temperatures, 77.5% macroscopical gel 0.005%
(4) application performance: styrene-butadiene latex provided by the invention can be directly used in concrete modifying, and its application performance is as follows:
| Application indexes | Bending tensile strength/MPa | ＞5 |
| Ultimate compression strength/MPa | ＞30 | |
| Slip resistance/MPa | ＞20 | |
| Young's modulus/* 10 3MPa | ＞15 |
Embodiment 2:
Stir at a band, import and export of nitrogen, material import and export, in the 10L polymeric kettle of thermometric pressure tap and chuck, add 2000 milliliters of deionized waters and 2500ml and contain the deion aqueous solution of emulsifying agent 65g and potassiumphosphate 9g, add vinylbenzene 1450ml, other function monomers 80g, tert-dodecyl mercaptan 7.5ml and contain the aqueous solution 500ml of Potassium Persulphate 13.5g, start vacuum pump, found time 30 minutes, then, add divinyl 900g, send into hot water to jacket of polymerization, the intensification polymerization, keep 55 ± 1 ℃ of polymeric reaction temperatures, behind transformation efficiency＞45%, in polymeric kettle, add vinylbenzene continuously, each 500g of divinyl, tert-dodecyl mercaptan 7.5ml, the aqueous solution 500ml that contains emulsifying agent 20g and other auxiliary agents improves temperature of reaction to 65 ± 1 ℃, keeps reaction.When transformation efficiency during, stop in monomer total amount＞97%.
Polymer emulsion is through after flash liberation and the vacuum outgas, and unreacted divinyl is removed fully, during residual styrene content＜500ppm, adds back additive 160ml under agitation in 50～60 ℃ of reactions two hours, discharging then.
Embodiment 3:
In above-mentioned polymerization reactor, add deionized water 2000ml and 2500ml and contain alkyl-sulphate 35g, H-9533g, 21gTX-15, the deion aqueous solution of potassiumphosphate 7.5g, add vinylbenzene 1500ml, other function monomers 70g, tert-dodecyl mercaptan 9ml and contain the aqueous solution 500ml of Potassium Persulphate 35.0g starts vacuum pump, found time 30 minutes, add divinyl 550g then, send into hot water, the intensification polymerization to jacket of polymerization, keep 55 ± 1 ℃ of polymeric reaction temperatures, after transforming, in polymeric kettle, add divinyl 450g continuously, vinylbenzene 500ml in monomer total amount＞55%, tert-dodecyl mercaptan 12ml, the aqueous solution 500ml that contains emulsifying agent 20g and other auxiliary agents improves temperature of reaction to 65 ± 1 ℃, keeps reaction.When transformation efficiency during, stop in monomer total amount＞97%.
Polymer emulsion is through after flash liberation and the vacuum outgas, and unreacted divinyl is removed fully, during residual styrene content＜500Ppm, adds back additive 60ml under agitation in 50～60 ℃ of reactions discharging in four hours.Use according to method in common, functional, all reach predetermined result.
Embodiment 4:
By example two methods and feeding quantity, just vinylbenzene, divinyl, other function monomers and conditioning agent once add and carry out polymerization, when transformation efficiency during in monomer total amount＞97%, stop.This polymer emulsion through flash liberation and vacuum outgas after, unreacted divinyl is removed fully, during residual styrene content＜500ppm, adds back additive 60ml under agitation in 50～60 ℃ of reactions discharging in four hours.
Embodiment 5:
In the polymeric kettle of a 10L, add entry 2.5L, contain the aqueous solution 1500ml of ionogen and composite emulsifier, K
2S
2O
8Aqueous solution 900ml, vinylbenzene 1650ml, TDM8.0ml, divinyl 900g, other function monomers 80g carries out polymerization in 55 ± 1 ℃, after polymerisation conversion reaches 50% in the monomer total amount, rising temperature of reaction to 65 ± 1 ℃ is divided three times and is added mercaptan 7.0ml, and final polymerisation conversion counts 97.5% with the monomer total amount.
Embodiment 6:
In the polymeric kettle of a 10L, add entry 2.5L, contain electrolytical compound emulsion agent solution 1.5L, K
2S
2O
8Aqueous solution 0.9L, vinylbenzene 0.85L, TDM8.0ml, divinyl 1850g, other function monomers 70g carries out polymerization in 55 ± 1 ℃, and when polymerisation conversion reached 55% in the monomer total amount, rising temperature of reaction to 65 ± 1 ℃ was divided five times and is added 13.0ml TDM.Final polymerisation conversion counts 97.5% with the monomer total amount.
Embodiment 7:
As the straight styrene-butadiene rubber breast explicitly called for styrene content, concrete modifying also explicitly called for scope with styrene-butadiene latex to styrene content, and styrene content exceeds its specialized range will influence its application performance.Therefore, how to take the effective synthesis process condition to guarantee in whole polymerization process, it is one of key issue that guarantees quality product that the styrene content that increases the chain polymerization thing changes in specialized range, and the method that we adopt secondary to add monomer and other auxiliary agents continuously guarantees to increase styrene content in the chain polymerization thing in specialized range.For example, for synthetic high-phenylethylene content polymer cement-based waterproof material styrene-butadiene latex, we are earlier to the monomer of paradigmatic system adding in monomer total amount calculated amount 20～45%, initiated polymerization, when polymerisation conversion reaches 60% when above in the monomer total amount, under differentiated yields, divide 2 times all the other monomers in monomer total amount 55～80% to be added in the paradigmatic system and go, can guarantee to increase the vinylbenzene of chain polymerization thing in specialized range.
8: one 12m of embodiment
3The still production example:
At a 12m
3Polymeric kettle in, add entry 3000L, and 1360L contains the aqueous solution of ionogen and composite emulsifier, K
2S
2O
8Aqueous solution 320L, vinylbenzene 1750L, TDM8.5L, divinyl 2.05m
3, other function monomers 220kg carries out polymerization in 55 ± 1 ℃, after polymerisation conversion reaches 40% in the monomer total amount, adds the aqueous solution that 800L contains other function monomers, ionogen and composite emulsifier continuously, K
2S
2O
8Aqueous solution 400L adds vinylbenzene 1850L continuously, divinyl 1.55m
3, 8.5L mercaptan.Improve temperature of reaction to improving temperature of reaction to 65 ± 1 ℃, keep reaction.Final polymerisation conversion is in monomer total amount 97.3%, reduce the still temperature to being lower than when improving temperature of reaction to 55 ℃, directly discharging is to the still that outgases, after polymer emulsion process flash liberation and the vacuum outgas, unreacted divinyl is removed fully, during residual styrene content＜500Ppm, adds 20% alkali lye and regulates the pH value to 7-8, add the back additive to degassing still, stir discharging in 1 hour.Good according to the method in common use properties, all reach predetermined result.
Embodiment 9:
If cinnamic consumption is increased to 55 parts by 45 parts among the embodiment one, divinyl is reduced to 28 parts from 33 parts, and initially phenolic group Soxylat A 25-7-10 is 0.5 part the ninth of the ten Heavenly Stems in the emulsifying agent, and all the other conditions are with embodiment one, and the latex of production still satisfies service requirements.
Embodiment 10:
If the esters of unsaturated carboxylic acids consumption is adjusted into 14 parts, the vinylbenzene consumption is adjusted into 39 parts, and other monomer ratio and condition are identical with example one, and the latex use properties of being produced still can reach requirement.Compare with embodiment one, the latex particle size of being produced by example three reduces, but cost increases to some extent.
The comparative example 1:
Change the methylene-succinic acid among the embodiment one into vinylformic acid entirely, other monomer and auxiliary agent are identical with embodiment one, and at this moment the mechanical stability of latex of Sheng Chaning decreases, and viscosity of latex increases.
The comparative example 2:
If the consumption of emulsifying agent is brought up to 3.0 parts by 1.85 parts among the embodiment one, other monomer, auxiliary agent and technology are identical with embodiment one.By the latex that this example is produced, mechanical stability is better, and particle diameter reduces, and viscosity increases.
The comparative example 3:
Emulsifying agent phenolic group in ninth of the ten Heavenly Stems Soxylat A 25-7 TX-12 among the embodiment one is removed, and the consumption of H-95 is once brought up to 1.3 parts, and other monomer, auxiliary agent and technology are identical with embodiment one.By the latex that this example is produced, mechanical stability is constant substantially, the chemical stability variation, and particle diameter has reduction slightly, and viscosity increases.
The comparative example 4:
Second emulsifying agent sodium lauryl sulphate among the embodiment one is removed for 0.05 part, and the consumption of the H-95 of secondary is brought up to 1.05 parts, and other monomer, auxiliary agent and technology are identical with embodiment one.By the latex that this example is produced, mechanical stability variation, chemical stability are constant substantially, and particle diameter increases, and distribution broadens.
The comparative example 5:
The consumption of initiator among the embodiment one is brought up to 2.5 parts, and other monomer, auxiliary agent and technology are identical with embodiment one.By the latex that this example is produced, speed of response is obviously accelerated, and mechanical stability variation, chemical stability are constant substantially, and particle diameter reduces, and viscosity surpasses 300mPa.s.
Example six: if monomer, auxiliary agent, soft consumption are identical with embodiment one, the adjustment temperature of reaction is brought up to 85 ℃ with the late phase reaction temperature.The latex physical index medium viscosity of producing by this example surpasses the span of control of 85mPa.s, and particle diameter is reduced to 179nm.
Claims (3)
1. synthetic method that improves the carboxylic styrene butadiene latex of concrete tensile strength is characterized in that:
(1) synthetic components in mass portion proportioning is as follows:
Divinyl or isoprene 30-50 part, vinylbenzene 40-55 part, vinyl cyanide 1-3 part, N hydroxymethyl acrylamide 1-4 part, methacrylic acid 0.1-5 part, methylene-succinic acid 1-5 part, n-butyl acrylate 4-12 part, emulsifying agent 1.0-2.0 part, initiator potassium persulfate 0.4-1.0 part, molecular weight regulator tert-dodecyl mercaptan or dodecyl mercaptan carbon 0.1-0.8 part, pH value buffer reagent sodium bicarbonate 0.01-0.5 part, potassiumphosphate 0.01-5 part, sequestrant tetrasodium ethylenediamine tetraacetate or disodium ethylene diamine tetraacetate 0.01-5 part and soft water 100-150 part;
Emulsifying agent is in anionic emulsifier Seconary Alkane Sulphonate Sodium and/or sodium lauryl sulphate and nonionic emulsifying agent phenolic group in ninth of the ten Heavenly Stems Soxylat A 25-7 and/or the sodium formaldehyde condensation products at least three kinds compound, and negatively charged ion is 1: 1 with the ratio of nonionic consumption;
(2) polymerization technique:
Polymeric kettle vacuumizes the back and drops into soft water, emulsifying agent, molecular weight regulator, pH buffer reagent and partial monosomy, charging capacity is 20-80%, after being warmed up to 50-55 ℃, add the part initiator, temperature of reaction is 63 ± 1 ℃, reacted 3 hours, temperature of reaction is increased to 67 ± 1 ℃, reacted 9 hours, react when transformation efficiency reaches the 60-90% of monomer total amount, add leftover materials and initiator, when transformation efficiency reaches 99.0% of monomer total amount, rubber cement carries out vacuum outgas to be handled, degassing temperature between 40～80 ℃, vacuum tightness-0.06-0.09MPa, degassing back residual styrene content is at 0～500ppm, reach between the 7-9 with alkali lye impregnation breast pH value, cool to 30-50 ℃ after discharging pack.
2. a kind of synthetic method that improves the carboxylic styrene butadiene latex of concrete tensile strength according to claim 1 is characterized in that: degassing temperature is at 50～70 ℃.
3. a kind of synthetic method that improves the carboxylic styrene butadiene latex of concrete tensile strength according to claim 1 is characterized in that: degassing vacuum tightness is-0.07-0.08MPa.
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| CN111269348A (en) * | 2020-01-19 | 2020-06-12 | 杭州龙驹合成材料有限公司 | Super-soft carboxylic styrene-butadiene latex for building and preparation method thereof |
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| CN101367897B (en) * | 2008-10-08 | 2010-06-09 | 中国石油集团工程技术研究院 | Synthesis of modified styrene butadiene rubber latex special for well cementing cement paste for oil-gas field |
| CN101993210A (en) * | 2010-03-04 | 2011-03-30 | 山西大学 | Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof |
| CN101993210B (en) * | 2010-03-04 | 2011-11-09 | 山西大学 | Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof |
| CN102174137A (en) * | 2011-01-31 | 2011-09-07 | 淄博齐龙化工有限公司 | Synthetic latex for cement and preparation method thereof |
| CN105542079A (en) * | 2016-02-19 | 2016-05-04 | 莱芜兴业滤材树脂有限公司 | Method for preparing styrene-butadiene latex without adding emulsifier |
| CN105837750B (en) * | 2016-04-28 | 2018-10-12 | 常州市灵达化学品有限公司 | A kind of road emulsified asphalt modification styrene-butadiene latex and preparation method |
| CN105837750A (en) * | 2016-04-28 | 2016-08-10 | 常州市灵达化学品有限公司 | Styrene-butadiene latex for road emulsified asphalt modification and preparation method thereof |
| CN105948564A (en) * | 2016-05-09 | 2016-09-21 | 济南大学 | Cement concrete water reducing agent suitable for machine-made sand |
| CN109438621A (en) * | 2018-11-09 | 2019-03-08 | 新辉（中国）新材料有限公司 | Functional butylbenzene copolymer latex and its preparation method and application |
| CN109438621B (en) * | 2018-11-09 | 2023-07-18 | 新辉（中国）新材料有限公司 | Functional butylbenzene copolymer latex, preparation method and application thereof |
| CN110877966A (en) * | 2019-11-16 | 2020-03-13 | 北京建工新型建材有限责任公司 | High-damping concrete and preparation method thereof |
| CN111269348A (en) * | 2020-01-19 | 2020-06-12 | 杭州龙驹合成材料有限公司 | Super-soft carboxylic styrene-butadiene latex for building and preparation method thereof |
| CN113278106A (en) * | 2021-06-10 | 2021-08-20 | 天津大学 | Pulverized latex toughening agent with good dispersibility as well as preparation method and application thereof |
| CN114014967A (en) * | 2021-12-08 | 2022-02-08 | 上海市安装工程集团有限公司 | Modified carboxylic styrene-butadiene latex and preparation method thereof |
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