Free PCE Technology?
Some Chinese company, for example, will give you so called free PCE technology, then ask you to buy their coded Chemicals or catalysts, which you buy only from their company with expensive price. Because they will not give you exact chemical names which can let you to buy all raw materials at market with marketed price. Their monopoly price is several times more expensive than real market price. For those students, we will provide real chemical names for you with some training fee.
Our traing will tell you everything, so you can buy all materials in the market by yourself with reasonable market price.
International Training for Polycarboxylate Superplasticizer
1) Instruction for Polycarboxylate Synthesis in lab
2) Free visit to large production line for PC
3) Large Scale Production for PC, acetone superplasticizer, naphathalene superplasticizer
4) internet training by skype on video, you just add me on skype, robertbian@hotmail.com, or robertbian
Date: anytime but book in advance
Address:Nanjing(near Shanghai),P.R.China
Contact: robertbian@gmail.com
Background of PC
In 1981, polycarboxylate superplasticizer comb copolymer were introduced as a new class of superplasticizer in Japan. their stucture characteristic is an anionic polymer backbone which holds lateral graft chains. These side chains intigate a steric hindrance effect between the cement particcles suspended in water. Through this unique mechanism, PCE superplasticizers exhibit superior dispersing force compared to polycondensates. Because of their highly tunable chemical and molecular structure, PCE can accomodate different perposes such as providing long slump retention, effectiveness at ultra-low water -to-cement ratios, or the so-called "Saratto-Kan" effect whereby concrete rapidly flows to its final spread.
Classification of PC
In 2006, the author suggested that according the chemical bond between the graft chain and backbone, we classifed two types of PC in commerical market. One is MPEG type PC, their bond is ester type, we called this type of ester type PC. Another type is ether bond between graft chain and backbone, we called this type PC ether type PC.
Traditional PC was made from MPEG(methoxy polyethylene glycol) by two steps. First step is direct esterifcation of MPEG and methacrylic acid or by MPEG with methyl methacrylate by transesterification process. This process is in long process and high temperature to facilitate esterifcation process. Second process is copolymerization in aqueous condition. From 2008, a brand new type of macromonomer were invented in China, these macromonomers can be used direct copolymerization without any esterification process. Because their advantage of easy handing, copolymerization and low temperature, they are extensively used in China. Now these macomonomers names is very confusing from different company.My new suggestion is depending the starting unsaturated alcohol, we classifed mocromonomers to C2,C3 and C4 macromonomers.
Classification of macromonomer for PC
C2 macromonomer is manufactured with 4-Vinyloxybutanol (or Hydroxybutyl vinyl ether cas no17832-28-9) with ethylene oxide in the presence of alkali catalyst. It is also call VPEG. CH2=CH-O-CH2CH2CH2CH2O-(CH2CH2O)nH. This VPEG is copolymerized with maleic anhydride at low temperature(<30 degree)
C3 macromonomer, allyl alcohol is ethoxylated with ethylene oxide with alkali catalyst.This macromonomer is called APEG. APEG and maleic anhydride as key monomer via radical copolymerization either in bulk or in aqueous solution. Comonomers such as styrene are frequently used as so-called spacer molecules to adjust the conformational flexibility of the trunk chain. This method provide polymers with pronounced stiffness or more coiled conformation and hence modifies their adsorption behavior.
C4 macromonomer, methallyl alcohol is ethoxylated with ethylene oxide in the presence of alkali catalyst, it is called HPEG (VPEG in Korea). HPEG is very reactive monomer, they can self polymerized during summer time, more easily copolymerized with acrylic acid, with a lot of heat was release during polymerization process. So shelf time is short, some anti-oxidant was introduced in HPEG to prevent self polymerization.
C5 macromonomer, isoprenol is ethoxylated with ethylene oxide in the presence of alkali catalyst, it is called TPEG or IPEG commercially. IPEG or TPEG can easily copolymerize with acrylic acid and other monomers in aqueous condition. With temperature or without any heating process by redox initiators.
C6 macromonomer, Ethylene glycol monovinyl ether or Diethylene glycol vinyl ether used as initial alcohol, exthoxylated with ethylene oxide, to the molecular weight around 3000. This kind of macromonomer is mainstream raw materials in China.
By Robert Bian
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