Core-shell type polymer microspheres, preparation and applications thereof
A polymer, core-shell technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of great environmental differences, achieve simple preparation methods, facilitate micro-crack repair, and large volume expansion Effect
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[0025] Example 1
[0026] Add 900g of deionized water, 4.5g of sodium lauryl sulfate, and 9g of polyvinyl alcohol to a 3000ml reaction flask. Stir slowly. After all the added materials are dissolved, add 100g of styrene, 30g of divinylbenzene, and benzyl peroxide. Then replace the air in the reactor with nitrogen. Increase the stirring speed to 250r / min. After stirring for 30 minutes, the temperature is raised to 80°C and reacted for 4 hours; add dropwise containing octadecyl acrylate 50g, styrene 100g, divinylbenzene 5g and After the addition of 5 g of benzoyl peroxide, the reaction is continued for 4 hours, the temperature is lowered to room temperature, the material is discharged, and the product is filtered to obtain the product.
[0027] Perform performance tests on the products obtained above and prepare cement slurry according to the GB / T19139-2003 standard. The cement slurry formula is as follows:
[0028] ①The cement stone formula with self-healing microspheres is: Shengwei...
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