Synthesizing method for polycarboxylate superplasticizer polymonoether
A technology of monomer polyether and synthesis method, which is applied in the field of concrete admixture, can solve the problems of polycarboxylate water reducer such as short storage period, unsatisfactory storage stability, and product performance decline, so as to achieve non-degradable, improved performance, The effect of improving product performance
Inactive Publication Date: 2016-06-22
天津冶建特种材料有限公司 +1
View PDF6 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the storage stability of polyether polyols in the prior art is not ideal enough, and free radical oxidative degradation is prone to occur during long-term storage, resulting in water reduction of the polyether polyols and polycarboxylic acids synthesized from the polyether polyols. short shelf life
And, when carrying out bulk polymerization, because do not contain water, so polyether polyol in the prior art is easy to another kind of raw material in the polycarboxylate superplasticizer: small molecule unsaturated carboxylic acid (ester, anhydride), such as Acrylic acid (methyl acrylate, maleic anhydride) undergoes esterification or transesterification reactions, resulting in the formation of more cross-linked structures in the final product, which greatly reduces product performance and even produces production accidents
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] figure 1 It is a schematic flow chart of the synthesis method of the polycarboxylate water reducer monomer polyether in the embodiment of the present invention. like figure 1 As shown, the synthetic method of polycarboxylate water reducer monomer polyether in the embodiment of the present invention comprises:
[0026] Step 11, adding alkali metal hydride or borohydride into the initiator to prepare the sodium salt of the initiator.
[0027] In step 12, a predetermined amount of ethylene oxide is passed into the sodium salt of the initiator to form a prepolymer.
[0028] Step 13, continue to feed ethylene oxide into the prepolymer, and keep the predetermined feeding speed and reflux speed, so as to generate unsaturated polyether.
[002...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a synthesizing method for polycarboxylate superplasticizer polymonoether. The synthesizing method comprises the steps that alkali metal hydride or borohydride is put into an initiator to prepare sodium salt of the initiator; a preset amount of ethylene oxide is introduced into sodium salt of the initiator, and a prepolymer is generated; ethylene oxide continues to be introduced into the prepolymer, the preset feeding speed and the back-flow speed are maintained, and thus unsaturated polyether is generated; a preset proportion of carboxylic acid or carboxylic acid anhydride with the number of carbon atoms not larger than 20 is put in, the preset temperature is maintained, and continuous stirring is carried out for a preset time; stabilizing agents of the preset varieties are added according to preset proportions. By application of the synthesizing method, prepared polyether polyol can have the advantages that polyether polyol is good in stability, not likely to degrade and long in shelf life, and polycarboxylate superplasticizer synthesized with polyether polyol is high in performance.
Description
technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a method for synthesizing polycarboxylate superplasticizer monomer polyether. Background technique [0002] Polyether polyol (referred to as polyether) is composed of initiators (compounds containing active hydrogen groups) and ethylene oxide (EO), propylene oxide (PO), butylene oxide (BO), etc. in the presence of catalysts Prepared by polyaddition reaction. The polyether polyol can have various molecular weight models according to different degrees of polymerization. This product is an important chemical intermediate, mainly used in the production of dispersants such as non-ionic surfactants, and can also be used as a carrier for cosmetics and ointments. [0003] Polycarboxylate superplasticizer is a concrete admixture developed in recent years. Its main function is to give concrete better working performance, including fluidity, workability, etc., without changin...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/332C08G65/12
CPCC08G65/3322C08G65/12C08G65/3326
Inventor 郭诚吴志刚刘伟闫俊阳李华孟宪荣
Owner 天津冶建特种材料有限公司