Pre-gelatinized starch and preparation method thereof

Abstract

The invention provides pre-gelatinized starch and a preparation method thereof. The pre-gelatinized starch comprises the following components in percentage by weight: 87.00-99% of pre-gelatinized tapioca starch, 0.1-1% of 2-methyl-4-isothiazolin-3-one (MI), 0.1-1% of 5-chloro-2-methyl-4-isothiazolin-3-one (CMI) and the balance of water. The product provided by the invention has the characteristic of perfect liquidity like fine sand, and the characteristic is very convenient to use on the site; although as a powdery product, the product does not generate dust and avoids harm to the physical health of workers on the site; after being added into water or slurry, the product can be automatically and uniformly dispersed and quickly dissolved, and the phenomenon of caking or fish eyes is avoided even without stirring; the requirement on the water loss of 4% salt water and saturated salt water slurry at normal temperature is met; the temperature resistance is good, and the acceptable temperature can reach 120 DEG C in 4% NaCl and saturated salt water slurry; and the product is not a toxic substance and does not have oxidability, corrosivity and radioactivity.

Description

technical field [0001] The invention relates to a pregelatinized starch and a preparation method thereof. Background technique [0002] Pregelatinized starch (PGTS) is a white powder, which is synthesized by α-modification of starch, also known as α-starch, odorless, non-toxic, and hygroscopic. It dissolves in cold water and becomes a translucent stable colloid, insoluble in ethanol, ether and chloroform, and is widely used in oil drilling, food, foundry, textile, papermaking, feed and other industries. Pregelatinized starch is often used in oil drilling to prevent viscosity increase and reduce water loss. As a mud fluid loss reducer, it has the advantages of high quality and low price, easy biodegradation, salt resistance, and calcium resistance. Green drilling fluid materials for environmentally friendly drilling operations. [0003] Potato flour and cassava flour are the two main raw materials for the production of this product, but most of the world’s dominant is potat...

AI Technical Summary

Problems solved by technology

[0003] Potato flour and cassava flour are the two main raw materials for the production of this product, but most of the world’s dominant is potato starch. In order to obtain a stable and reliable supply of potato starch in drilling applications, the current problem is that it must cooperate with the fast food industry. competition, and the fast food industry occupies an important position in people's lives. When the supply of potato starch is in short supply, the fast food industry often takes priority, resulting in a decline in the production of pregelatinized starch

The biggest disadvantage of this process is that the water content of starch milk is as high as 55%, the drying energy consumption is large, and the production cost is high; the second is that the product has a high viscosity, and the quality is not easy to meet the ISO-13500 international standard for oil field drilling

The starch milk concentration of this process is low, the water evaporation is high, and the production cost is high; the biggest disadvantage is that the solubility of the product is low and the quality is poor

At present, this process is rarely used

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