Method for preparing binary copolymer

A technology of binary copolymers and polymers, which is applied in the field of preparation of binary copolymers to achieve good anti-fouling effect and excellent anti-fouling effect

Inactive Publication Date: 2011-06-08
武侯区巅峰机电科技研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few reports on the synthesis of antifouling agents

Method used

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  • Method for preparing binary copolymer
  • Method for preparing binary copolymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The amount of the fixed initiator is 0.5% of the mass of the monomer, the molar ratio of the new monomer to acrylamide is 6:4, the mass ratio of water to the monomer is 2:1, pH=7.0, and the copolymerization is obtained when the temperature of the polymerization system is changed. Table 1 shows the relationship between the reaction temperature and the anti-fouling rate.

[0019] Table 1: Reaction temperature and copolymer antifouling rate

[0020]

[0021] It can be seen from Table 1 that as the temperature increases, the anti-fouling rate increases gradually. When the temperature rises to 75°C, the anti-fouling rate reaches the maximum value, and then continues to rise, and the anti-fouling rate decreases slightly. This is because the initiator used is ammonium persulfate, and its decomposition temperature is around 70°C. If the polymerization temperature is too low, the decomposition rate of the initiator is slow, and there are few free radicals, and the induction p...

Embodiment 2

[0023] Fix the molar ratio of the new monomer to acrylamide at 6:4, the amount of the initiator is 0.5% of the mass of the monomer, react at a constant temperature of 75°C for 5 hours in a polymerization system with different pH values ​​to obtain a polymer antifouling agent, and the pH value of the polymerization system is Influence of anti-fouling effect, the results are shown in figure 1 . Depend on figure 1 It can be seen that as the pH value of the polymerization system increases, the anti-fouling rate increases. When the pH value is 7.0, the anti-fouling rate reaches the maximum, and then increases the pH value, and the anti-fouling rate decreases gradually. Therefore, the pH of the polymerization system was set at pH=7.0.

Embodiment 3

[0025] The molar ratio of new monomer and acrylamide is fixed at 6:4, the amount of initiator is 0.5% of the monomer mass, pH=7.0, and the reaction time and temperature are changed to prepare the copolymer antifouling agent. The influence of reaction time on conversion rate , see the result figure 2 . from figure 2 It can be seen that with the increase of the reaction time, the conversion rate of the monomer in the polymerization reaction is gradually increasing at different temperatures, and when the reaction time reaches 5h, the conversion rate remains basically unchanged; at the same time, as the reaction temperature increases, The conversion rate also gradually increased. Therefore, the polymerization reaction time was set as 5h.

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Abstract

The invention relates to a method for preparing a binary copolymer. In the invention, with acrylamide and chloroacetic acid in a molar ratio of 6:4 as raw materials, a monomer is obtained through a reaction by utilizing a method of aqueous solution polymerization; when the monomer and the acrylamide are under the condition of an optimal reaction temperature below 75 DEG C, an optimal reaction time of 5 hours and a system optimal pH of 7, the yield is highest and the antiscale rate of the obtained product is better.

Description

technical field [0001] The invention relates to a preparation method of a binary copolymer. Background technique [0002] The most common scale type in oil fields is calcite calcium carbonate (CaCO 3 ), calcium sulfate dihydrate (CaSO 4 2H 2 O), anhydrite calcium sulfate (CaSO 4 ), rock salt (NaCl), barite barium sulfate (BaSO 4 ) and celestite strontium sulfate (SrSO 4 ). However, trace amounts of strontium sulfate often exist in large amounts of barium sulfate, and it is difficult to separate them. The main reason for fouling is due to changes in pressure or temperature, evaporation, or the mixing of two incompatible waters, so that the inorganic salts (CaCO, which originally existed in the aqueous solution in an ionic state) 3 , CaSO 4 or BaSO 4 ) reached a supersaturated state, exceeding their solubility and crystallizing out to form scale. The fouling process is the process of crystallization and aggregation of a certain concentration of scaling ions under cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/38C08F220/56
Inventor 黄友华
Owner 武侯区巅峰机电科技研发中心
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