CN1288870A - Efficient carboxilic acid grafting water-reducing agent and its synthesis - Google Patents
Efficient carboxilic acid grafting water-reducing agent and its synthesis Download PDFInfo
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- CN1288870A CN1288870A CN 00127294 CN00127294A CN1288870A CN 1288870 A CN1288870 A CN 1288870A CN 00127294 CN00127294 CN 00127294 CN 00127294 A CN00127294 A CN 00127294A CN 1288870 A CN1288870 A CN 1288870A
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Abstract
The invented water-reducing agent includes the multifunctional copolymer containing carboxylic group, hydroxyl group and sulfonic acid group and polycarboxylic acid containing polyoxygethyl group and lateral group, in which the former is obtained by polymerizing unsaturated vinyl monomer containing lateral group in oxidation-reduction system, and the latter is obtained by making polyethylene glycol and maleic anhydride produce esterification reaction and polymerizing the above-mentioned material and acrylic acid and acrylate monomer. The property of said product is good and its raw material is easily available.
Description
The present invention is a kind of polymeric carboxylic class graft type water reducer that is used for concrete admixture and preparation method thereof.
Concrete be use in building, building, water conservancy and the many engineerings material very widely.Ready mixed concrete in modern building operation is because the mode of production of its intensification and stable excellent quality product, thereby driven the quickening of building operation progress and the raising of construction quality, uses also more and more widely.
Concrete admixture (based on the compound additive of water reducer) is that requisite a kind of useful component is the 5th component in the concrete, progressively plays the effect of core in the concrete production technology, has brought into play huge effect.Concrete effect comprises:
1. mix admixture and save the energy in large quantities, protected resource and environment.After mixing admixture, approximately cement 15～20% can be saved among every cubic meter of concrete, making full use of of agglutinates such as flyash, breeze can also be assisted.To save a large amount of cement itself be exactly to have saved a large amount of energy, reduced the pollution to atmospheric environment such as the gas of emitting great amount of carbon dioxide among the process of producing cement.
2. mix admixture and can improve and improve concrete quality significantly.After admixture is incorporated in the concrete, can improve concrete strength, strengthen concrete various weather resistance, some can also improve the corrosion resistance nature of concrete reinforcement.
3. newly mix and stir easy performance by what improve ready mixed concrete, thereby improve execution conditions, alleviate physical labor intensity, help the operation of mechanize, improve speed of application greatly.
The chemical ingredients and the performance of concrete admixture are divided into following a few class at present:
1. inorganics class: comprise various inorganic salts, some metal simple-substances and a spot of oxyhydroxide etc.This class material is used for adjustable solidification agent, frostproofer, tinting material and whipping agent etc. more.
2. organism class: this class material is a lot, and wherein major part belongs in the category of tensio-active agent, and anionic, cationic, non-ionic type and polymeric surface active agent etc. are arranged.
In industrial advanced countries such as Japan, the U.S., the admixture kind is a lot, and has formed series product and use for the user.China just really begins to be extensive use of admixture latter stage until the eighties.
At first be to utilize various industrial wastes, extract calcium lignin sulphonate as paper mill spent pulping liquor and make widely, be used to produce low-grade ready mixed concrete such as C20～C40 as the coventional type water reducer; The tankage of sugar refinery are used to prepare retardant.Use range is limited, and does not satisfy the demand that increases day by day.
Along with the fast development of concrete industry, need the higher high efficiency water reducing agent of water-reducing rate, the high efficiency water reducing agent of the first-generation is the poly-naphthalene sulfonic acid formaldehyde condensation polymer of sixties Japanese Kao company exploitation, and in use constantly improves synthesis device and technology.This Series Admixtures production cost is lower, and water-reducing effect is better, thereby is used widely in the whole world, is indispensable high efficiency water reducing agent.Simultaneously succeed in developing the condensate of melamine and formaldehyde high efficiency water reducing agent in the sixties in Germany, its performance and naphthalene series high-efficiency water-reducing agent are approaching, are used among the precast concrete more.But raw material is limited, and on the high side.
With abroad compare, the achievement in research of China aspect high efficiency water reducing agent is less.At present, the domestic concrete high efficiency water reducing agent that generally uses mainly is naphthalenesulfonate formaldehyde condensation compound and sulfonated melamine compound condenses two classes, wherein uses more extensively for first kind.NAPTHALENE FLAKES. (INDUSTRIAL GRADE is a naphthalene series high-efficiency water-reducing agent synthetic main raw material.The flourish present situation of construction industry causes limited NAPTHALENE FLAKES. (INDUSTRIAL GRADE can not satisfy the demand in market.The situation that a kind of like this single product is used has been brought bigger inconvenience to concrete construction.Therefore, be necessary to develop and produce cement water reducing agent based on other raw materials.
The objective of the invention is to develop that a kind of raw material is extensive, production cost is low, the easy industrialization of technology, effective efficient carboxilic acid grafting water-reducing agent and preparation method thereof.
The structure that contains carboxyl, hydroxyl, sulfonic group polyfunctional group efficient carboxilic acid grafting water-reducing agent multipolymer of the present invention is as follows:
M is H, Na
+, NH
4 +
R
1, R
4Be H ,-CH
3,-OH, CH
2OH ,-COOM, CH
2SO
3H ,-COOCH (OH) CH
3,
-CONHC(CH
3)
2CH
2SO
3H；
R
2, R
5Be H ,-CH
3,-OH, CH
2OH, CH
2SO
3H ,-COOM;
R
3, R
6Be H ,-CH
3,-C
2H
5
X, y are zero or units, and general (x+y) is greater than 3, less than 100.
The used monomer of the present invention is the unsaturated vinyl monomer that contains side group, suitable monomers such as vinylformic acid, methacrylic acid, toxilic acid, FUMARIC ACID TECH GRADE, crylic acid hydroxy ester, methacrylic acid hydroxyl ester, 2-acrylamido-2-methyl-propyl P-TOLUENE SULFO ACID 99, the sulfo group ethyl acrylamide, the sulfo group Methacrylamide, 2-acrylamido-2-methyl-propyl sulfonic acid, 2-hydroxyl-3-sulfo group propyl group acrylamide etc.
The structure of the polycarboxylate water-reducer that contains the polyethoxye side group of the present invention is as follows:
M is H, Na
+, NH
4 +
0≤a≤1; N, m are integer; R
1Be H, CH
3, R
2Be CH
3
The preparation that contains carboxyl, hydroxyl, sulfonic group polyfunctional group multipolymer water reducer is trigger monomer polymerization in oxidation-reduction system, 40～150 ℃ of temperature of reaction, 2～6 hours reaction times, monomer is the unsaturated vinyl monomer that contains side group, as vinylformic acid, methacrylic acid, methacrylic acid hydroxyl ester etc.Oxygenant, reductive agent are used the getting final product of common redox polymerization system, and as hydrogen peroxide, persulphate etc., reductive agent is Hypophosporous Acid, 50 or its salt.The oxygenant consumption is monomeric 1～20% (mol ratio), and the reductive agent consumption is monomeric 2～200% (mol ratios).
As mentioned above, if the consumption of oxygenant is monomeric 5～15% (mol ratios), the reductive agent consumption is monomeric 50～100% (mol ratio) better effects if, can make to react completely, and has reduced the complexity of aftertreatment again.
Above-mentioned reaction monomers is with the toxilic acid of 10～90 molar percentages; All the other are that acrylic or methacrylic acid effect is also fine, and raw material sources are extensive, abundant, and aftertreatment is simple and direct.
Above-mentioned reaction monomers is with the Propylene glycol monoacrylate of 5～30 molar percentages; The methacrylic acid of 0～30 molar percentage; All the other are that vinylformic acid or its salt also can obtain the good water reducer of water-reducing effect, and this is because carboxyl has good dissemination to cement granules.
Above-mentioned reaction monomers is with the sulfo group Methacrylamide of 5～30 molar percentages, or the sulfo group ethyl acrylamide, or 2-acrylamido-2-methyl-propyl sulfonic acid; All the other are vinylformic acid or its salt copolyreaction for the methacrylic acids of wherein arbitrary monomer and 0～30 molar percentage, can obtain the good multipolymer of water-reducing property equally, and this is because sulfonic group can make system still have good flowability than the low water usage amount time.
Above-mentioned reaction monomers is with the Propylene glycol monoacrylate of 5～30 molar percentages and the sulfo group Methacrylamide of 5～30 molar percentages, or 2-acrylamido-2-methyl-propyl sulfonic acid; All the other are that acrylic or methacrylic acid and salt copolymerization thereof have also obtained containing carboxyl, hydroxyl, sulfonic group polyfunctional group efficient carboxilic acid grafting water-reducing agent, and this is owing to comprise multiple functional group in these monomers, can improve the over-all properties of system.
Oxygenant of the present invention is with hydrogen peroxide or persulphate, as ammonium persulphate, Potassium Persulphate; Reductive agent is Hypophosporous Acid, 50 or its salt, as sodium hypophosphite, and potassium hypophosphite.
Above-mentioned temperature of reaction can obtain better effect 70～110 ℃ of scopes.
When preparing, the poly carboxylic acid that contains the polyethoxye side group earlier esterifications were taken place 0.5～2.0 hour down at 120～200 ℃ in polyoxyethylene and maleic anhydride; Reaction product 70～150 ℃ down and vinylformic acid or acrylic ester monomer, initiator, water polymerization 2～4 hours, monomer is vinylformic acid or esters of acrylic acid, as Rocryl 410,2-acrylamido-2-methyl-propyl sulfonic acid etc.The adding amount of monomer is 5～10 times of esterification reaction product molar weight.Initiator is ammonium persulphate or Potassium Persulphate, and amount of initiator is 2～8% of a monomer molar amount.Amount of water is decided according to the reaction solid content, is generally 25～40%.
If above-mentioned reaction monomers Rocryl 410 and 2-acrylamido-2-methyl-propyl sulfonic acid reaction, itself and polyoxyethylene molar ratio range are (0.8～5): 1.Can control the spacing distance of comb shape side chain on the main chain like this, thereby make the effect of side chain performance maximum dispersion.
If above-mentioned reaction monomers Rocryl 410 and 2-acrylamido-2-methyl-propyl sulfonic acid reaction, itself and polyoxyethylene molar ratio range are (1.5～2.0): 1.
Used polyoxyethylated molecular weight is 200～2000 in the above-mentioned reaction.
Product water-reducing property of the present invention is good, and from the different brands water reducer of the visible same water reducer volume of following contrast experiment, it is good than other products that it starches degree of mobilization only.Sample 1～4 is product of the present invention.
The inventive method raw material sources are extensive, numerous ethylenic unsaturation class monomer copolymerizations that contain side group can contain the carboxylic-acid graft type water reducer of carboxyl, hydroxyl, sulfonic group polyfunctional group multipolymer, and the carboxylic-acid graft type water reducer that same vinylformic acid or acrylic ester monomer polymerization also can obtain containing the polyethoxye side group has been expanded the synthesis material of this product greatly.The inventive method technology is simple, and production cost is not high, so industrialization prospect is very wide.
The performance of product of the present invention and external product relatively
| Product type | Volume (ml) | Clean slurry degree of mobilization (cm) |
| Homemade naphthalene is XP | 4.5 | 17 |
| The Mace spy | 4.5 | 20 |
| Gray Si | 4.5 | 22 |
| Sample 1 | 4.5 | 22 |
| Sample 2 | 4.5 | 23 |
| Sample 3 | 4.5 | 23 |
| Sample 4 | 4.5 | 25 |
Example 1: in the 500ml four-necked bottle that has thermometer, agitator, dropping funnel and reflux condensing tube, add Maleic Acid, Anhydrous acid anhydride 49g and deionized water 45g, add sodium hypophosphite 16g simultaneously, system temperature is elevated to 90 ℃.Dripped off the initiator solution that 36g contains Sodium Persulfate 6g in 2 hours.Initiator dripped after five minutes, and dropwise addition of acrylic acid solution 36g dripped off in 2 hours.Drip off the back and continue heating slaking 3 hours, make to react completely.Shift out system, cooling obtains transparent faint yellow solution, and solid content is more than 50%.
Example 2: in the 500ml four-necked bottle that has thermometer, agitator, dropping funnel and reflux condensing tube, add deionized water 20g, add sodium hypophosphite 10g simultaneously, system temperature is elevated to 80 ℃.2.5 hour drip off the initiator solution 16g that contains ammonium persulfate 6g, initiator dripped after five minutes, dripped to contain vinylformic acid 60g, the mixing solutions of methacrylic acid 15g and Propylene glycol monoacrylate 18g dripped off in 2 hours.After dripping off, be warming up to 90 ℃, continued to add thermomaturation 3 hours, make to react completely.Shift out system, cooling obtains transparent faint yellow solution, and solid content is more than 30%.
Example 3: in the 500ml four-necked bottle that has thermometer, agitator, dropping funnel and reflux condensing tube, add deionized water 60g, add Hypophosporous Acid, 50 40g simultaneously, system temperature is elevated to 80 ℃.2.5 hour drip off the initiator solution 50g that contains ammonium persulfate 20g, initiator dripped after five minutes, dripped to contain vinylformic acid 60g, the mixing solutions of methacrylic acid 20g and 2-acrylamido-2-methyl-propyl sulfonic acid 80g dripped off in 2 hours.After dripping off, be warming up to 90 ℃, continued to add thermomaturation 3 hours, make to react completely.Shift out system, cooling obtains transparent faint yellow solution, and solid content is more than 30%.
Example 4: in the 500ml four-necked bottle that has thermometer, agitator, dropping funnel and reflux condensing tube, add deionized water 40g, add Hypophosporous Acid, 50 15g simultaneously, system temperature is elevated to 80 ℃.2.5 hour drip off the initiator solution 28g that contains ammonium persulfate 8g, initiator dripped after five minutes, dripped to contain vinylformic acid 72g, the mixing solutions of Propylene glycol monoacrylate 9g and 2-acrylamido-2-methyl-propyl sulfonic acid 12g dripped off in 2 hours.After dripping off, be warming up to 90 ℃, continued to add thermomaturation 3 hours, make to react completely.Shift out system, cooling obtains transparent faint yellow solution, and solid content is more than 30%.
Example 5: in the three-necked bottle of the logical nitrogen of 250ml, add polyoxyethylene (800) 100g and maleic anhydride 12.3g, system temperature is elevated to 130 ℃, reacted 1 hour.Treat product cooling back taking-up.In the 500ml four-necked bottle that has thermometer, agitator, dropping funnel and reflux condensing tube, add the product 44.9g that takes out, Rocryl 410 7.1g, vinylformic acid 28.8g, deionized water 50g adds sodium hypophosphite 6.63g simultaneously, and system temperature is elevated to 70 ℃.Dripped off the initiator solution 80g that contains ammonium persulfate 6.84g in 2 hours, after initiator drips, be warming up to 80 ℃, continued to add thermomaturation 0.5 hour, make to react completely.Shift out system, cooling obtains transparent faint yellow solution, and solid content is more than 30%.
Claims (13)
1. efficient carboxilic acid grafting water-reducing agent is to contain the poly carboxylic acid that carboxyl, hydroxyl, sulfonic group polyfunctional group multipolymer contain the polyethoxye side group, it is characterized in that the structure that contains carboxyl, hydroxyl, sulfonic group polyfunctional group multipolymer is:
M is H, Na
+, NH
4 +
R
1, R
4Be H ,-CH
3,-OH, CH
2OH ,-COOM, CH
2SO
3H ,-COOCH (OH) CH
3,-CONHC (CH
3)
2CH
2SO
3H;
R
2, R
5Be H ,-CH
3,-OH, CH
2OH, CH
2SO
3H ,-COOM;
R
3, R
6Be H ,-CH
3,-C
2H
5
X, y are zero or units, and general (x+y) is greater than 3, less than 100;
The structure that contains the poly carboxylic acid of polyethoxye side group is:
M is H, Na
+, NH
4 +
0≤a≤1; N, m are integer; R
1Be H, CH
3, R
2Be CH
3
2. the preparation method of an efficient carboxilic acid grafting water-reducing agent, be to contain carboxyl, hydroxyl, the preparation method of sulfonic group polyfunctional group multipolymer in oxidation-reduction system, it is characterized in that trigger monomer polymerization in oxidation-reduction system, 40～150 ℃ of temperature of reaction, 2～6 hours reaction times, monomer is the unsaturated vinyl monomer that contains side group, and the oxygenant consumption is monomeric 1～20% mol ratio, and the reductive agent consumption is monomeric 2～200% mol ratios.
3. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2, the consumption that it is characterized in that oxygenant is monomeric 5～15% mol ratios, the reductive agent consumption is monomeric 50～100% mol ratios.
4. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that the toxilic acid of reaction monomers 10～90 molar percentages; All the other are acrylic or methacrylic acid.
5. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that reaction monomers is the Propylene glycol monoacrylate of 5～30 molar percentages; The methacrylic acid of 0～30 molar percentage; All the other are vinylformic acid or its salt.
6. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that the sulfo group Methacrylamide of 5～30 molar percentages, or the sulfo group ethyl acrylamide, or 2-acrylamido-2-methyl-propyl sulfonic acid; The methacrylic acid of 0～30 molar percentage, all the other are vinylformic acid or its salt.
7. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that the Propylene glycol monoacrylate of 5～30 molar percentages; The sulfo group Methacrylamide of 5～30 molar percentages, or 2-acrylamido-2-methyl-propyl sulfonic acid; All the other are acrylic or methacrylic acid and salt thereof.
8. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that oxygenant is hydrogen peroxide or persulphate, and reductive agent is Hypophosporous Acid, 50 or its salt.
9. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 2 is characterized in that temperature of reaction is 70～110 ℃.
10. the preparation method of an efficient carboxilic acid grafting water-reducing agent is the preparation method who contains the poly carboxylic acid of polyethoxye side group, it is characterized in that making under 120～200 ℃ polyoxyethylene and maleic anhydride generation esterification; 0.5～2.0 hour reaction times; Reaction product 70～150 ℃ down with vinylformic acid or acrylic ester monomer, initiator, water polymerization 2～4 hours, the adding amount of monomer is 5～10 times of esterification reaction product molar weight, amount of initiator is 2～8% of a monomer molar amount.
11. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 10 is characterized in that the monomer Rocryl 410 adds 2-acrylamido-2-methyl-propyl sulfonic acid and the polyoxyethylene molar ratio range is (0.8～5): 1.
12. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 11 is characterized in that the monomer Rocryl 410 adds 2-acrylamido-2-methyl-propyl sulfonic acid and the polyoxyethylene molar ratio range is (1.5～2.0): 1.
13. the preparation method of efficient carboxilic acid grafting water-reducing agent according to claim 10 is characterized in that the polyoxyethylene molecular weight is 200～2000.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00127294A CN1093095C (en) | 2000-11-07 | 2000-11-07 | Efficient carboxilic acid grafting water-reducing agent and its synthesis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00127294A CN1093095C (en) | 2000-11-07 | 2000-11-07 | Efficient carboxilic acid grafting water-reducing agent and its synthesis |
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| Publication Number | Publication Date |
|---|---|
| CN1288870A true CN1288870A (en) | 2001-03-28 |
| CN1093095C CN1093095C (en) | 2002-10-23 |
Family
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|---|---|---|---|
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330600C (en) * | 2005-11-24 | 2007-08-08 | 武汉理工大学 | Maleic acid anhydride series concrete water-reducing agent and preparation process thereof |
| CN100358825C (en) * | 2006-01-17 | 2008-01-02 | 武汉理工大学 | Acrylic acid series multiple copolymer analog high efficiency water reducing agent and its synthesis method |
| CN100360455C (en) * | 2004-12-09 | 2008-01-09 | 武汉科技大学 | Concrete water reducing agent of polyacrylic acid and its synthesis process |
| CN101215118B (en) * | 2008-01-14 | 2010-06-09 | 张建荣 | Copolymerization type polycarboxylic acids water reducing agent and method for preparing same |
| CN101575403B (en) * | 2008-07-31 | 2010-11-03 | 北京市建筑工程研究院 | Polymerization method for preparing polycarboxylic high-efficiency water-reducing agent |
| CN101983944A (en) * | 2010-07-07 | 2011-03-09 | 华侨大学 | Polycarboxylic acids water reducing agent containing low molecular weight carbon dioxide copolymer, and preparation method thereof |
| CN103073674A (en) * | 2012-09-25 | 2013-05-01 | 徐江涛 | Alkali slag cement concrete water reducer and preparation method thereof |
| CN104017125A (en) * | 2014-06-13 | 2014-09-03 | 石家庄市长安育才建材有限公司 | Anti-clay polycarboxylate water reducer capable of being compounded with naphthalene water reducer and preparation method thereof |
| CN105541169A (en) * | 2016-03-04 | 2016-05-04 | 厦门天润锦龙建材有限公司 | Special anti-scaling additive for pervious concrete and preparation method of additive |
| US9453097B2 (en) | 2015-02-15 | 2016-09-27 | Beijing University Of Technology | Method for preparation of polycarboxylate superplasticizer by graft copolymerization of fatty acid vinyl ester onto acrylate polymer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3338431A1 (en) * | 1983-10-22 | 1985-05-02 | Hoechst Ag, 6230 Frankfurt | WATER-SOLUBLE MIXED POLYMERS AND THE USE THEREOF AS DISPERGERS FOR SOLIDS |
| JPH01188449A (en) * | 1988-01-20 | 1989-07-27 | Nisso Masutaabirudaazu Kk | Admixture for ultrastiff concrete |
| DE4338867A1 (en) * | 1992-12-08 | 1994-06-09 | Sueddeutsche Kalkstickstoff | Water-soluble graft copolymers, used as dispersants for concrete etc. |
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2000
- 2000-11-07 CN CN00127294A patent/CN1093095C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100360455C (en) * | 2004-12-09 | 2008-01-09 | 武汉科技大学 | Concrete water reducing agent of polyacrylic acid and its synthesis process |
| CN1330600C (en) * | 2005-11-24 | 2007-08-08 | 武汉理工大学 | Maleic acid anhydride series concrete water-reducing agent and preparation process thereof |
| CN100358825C (en) * | 2006-01-17 | 2008-01-02 | 武汉理工大学 | Acrylic acid series multiple copolymer analog high efficiency water reducing agent and its synthesis method |
| CN101215118B (en) * | 2008-01-14 | 2010-06-09 | 张建荣 | Copolymerization type polycarboxylic acids water reducing agent and method for preparing same |
| CN101575403B (en) * | 2008-07-31 | 2010-11-03 | 北京市建筑工程研究院 | Polymerization method for preparing polycarboxylic high-efficiency water-reducing agent |
| CN101983944A (en) * | 2010-07-07 | 2011-03-09 | 华侨大学 | Polycarboxylic acids water reducing agent containing low molecular weight carbon dioxide copolymer, and preparation method thereof |
| CN101983944B (en) * | 2010-07-07 | 2013-03-06 | 华侨大学 | Polycarboxylic acids water reducing agent containing low molecular weight carbon dioxide copolymer, and preparation method thereof |
| CN103073674A (en) * | 2012-09-25 | 2013-05-01 | 徐江涛 | Alkali slag cement concrete water reducer and preparation method thereof |
| CN104017125A (en) * | 2014-06-13 | 2014-09-03 | 石家庄市长安育才建材有限公司 | Anti-clay polycarboxylate water reducer capable of being compounded with naphthalene water reducer and preparation method thereof |
| CN104017125B (en) * | 2014-06-13 | 2016-02-03 | 石家庄市长安育才建材有限公司 | Anti-stick soil type polycarboxylate water-reducer that can be composite with naphthalene water reducer and preparation method thereof |
| US9453097B2 (en) | 2015-02-15 | 2016-09-27 | Beijing University Of Technology | Method for preparation of polycarboxylate superplasticizer by graft copolymerization of fatty acid vinyl ester onto acrylate polymer |
| CN105541169A (en) * | 2016-03-04 | 2016-05-04 | 厦门天润锦龙建材有限公司 | Special anti-scaling additive for pervious concrete and preparation method of additive |
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|---|---|
| CN1093095C (en) | 2002-10-23 |
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