Polyacrylic acid sodium as a kind of fine chemical products, has been widely studied in recent years. Its synthesis method for molecular weight of the specific size, application features and factors such as economic point of view. Low molecular weight (about 1000 ~ 5 ooo), main dispersion effect. Polyacrylic acid sodium belongs to anionic polymer electrolyte, when its low molecular weight, oligomer ion cannot be suspended particle adsorption, but was adsorbed by suspended particles, adsorption of the oligomer of ion particles formation of electric double layer, changing the state of charge, under the effect of electrostatic charge, the particles repel each other, so to avoid collisions among the particles grew up deposits, and make the particles dispersed in solution. Dispersant effect on pigment particles is a chemical process. First of all, the dispersant dissolves in water, ion in the water, and the degree of ionization, forming large anion and a small amount of unlike charges cation, positive and negative ions firmly adsorbed on the surface paint particles, and the ions with the same charge; With ions of opposite electric charge free diffusion into the surrounding liquid medium, forming a charged ion diffusion layer, namely electric double layer; Due to the ions of the same charge repel each other, form the electrostatic repulsion, can prevent the pigment flocculation in aqueous medium. So as to achieve the aim of dispersion. As polyelectrolyte dispersant (sodium acrylate), its characteristic is to have a large skeleton of ion and an equivalent number of small, independent balance ions of opposite charge. Under the action of electrostatic repulsion, dispersant (sodium acrylate) has a strong ionization performance, degree of ionization is complete, the pigment particles surface adsorption ion affinity, the greater the dispersion effect is more effective. So from the dispersing mechanism of sodium polyacrylate is the ideal coating pigment dispersant.

Sodium hexametaphosphate has two effects on the inhibition of quartz, namely the desorption of adsorbed oleic acid on the surface and subsequent adsorption on the surface to make it hydrophilic, thus preventing the adsorption of dodecylamine. The selectivity of sodium hexametaphosphate to quartz The inhibitory effect is dependent on the selective activation of feldspar by sodium oleate. Only when the two are combined, the inhibition effect of feldspar and quartz on flotation separation of sodium hexametaphosphate can be achieved under the control of pH. After H reaches a certain value, the inhibition disappears. This is related to the increase of OH- concentration in the hydrolysis process, which will accelerate the hydrolysis process and convert it into orthophosphoric acid or orthophosphate ion and lose its effective form.

KeyWords: Prefilming agent; Sodium hexametaphosphate; Sodium polyacrylate  

目录

1概述....11.1六偏磷酸钠-聚丙烯酸钠预膜剂..2

1.1.1聚丙烯酸钠作为分散剂在预膜剂的应用.2

1.1.2聚丙烯酸钠的物理性质及预膜机理.2

1.1.3聚丙烯酸钠在预膜过程中的作用机理....3

1.1.4聚丙烯酸钠作为分散剂的用途.3

1.1.5水质稳定剂4

1.1.6钻井泥浆降失水剂4

1.1.7油井压裂液4

1.1.8水泥减水剂4

1.1.9陶瓷添加剂4

1.2红点法4

1.2.1方法概要4

1.2.2试剂5

1.2.3仪器5

1.3六偏磷酸钠的应用5

1.4本课题的研究与目的6

2实验..7

2.1主要原料与仪器设备...7

2.1.1主要原料7

2.1.2主要仪器设备7

2.2预膜剂的配置方法..7

2.2.1氯化钙-硫酸锌溶液的配置8

2.2.2六偏磷酸钠溶液的配置8

2.2.3聚丙烯酸钠溶液的配置8

2.3六偏磷酸钠的影响..8

2.4氯化钙-硫酸锌溶液浓度的影响9

2.5聚丙烯酸钠的影响......9

2.6预膜时间的影响10

3结果与讨论...11

3.1六偏磷酸钠不同浓度的影响...11

3.2氯化钙-硫酸锌浓度的影响..................11