Preparation method of composite wall protection slurry

Abstract

The invention relates to a preparation method of composite wall protection slurry, and belongs to the technical field of wall protection materials. According to the invention, starch-based interpenetrating network polymer emulsion is used as a raw material to prepare the composite wall protection slurry, wherein the interpenetrating network polymer is formed by continuously interpenetrating a network formed by respectively crosslinking two polymers, and the interpenetrating polymer network is in a chemical-physical blending form. Polyacrylate emulsion is mixed with starch to prepare interpenetrating network polymer emulsion, so that the water resistance of the polymer in the slurry can be improved. Polyacrylate can form a film with good gloss and water resistance after being dried, and thefilm is firm in adhesion, not easy to peel off, flexible and elastic at room temperature, and good in weather resistance. Polyacrylate and corn starch are mixed to prepare the interpenetrating network polymer, which can effectively improve the dispersity of polyacrylate in slurry. The water resistance of corn starch can also be effectively improved by mixing polyacrylate and corn starch, so thatthe anti-seepage effect of the wall protection slurry is effectively improved.

Description

technical field

[0001] The invention relates to a preparation method of composite wall protection mud, which belongs to the technical field of wall protection materials. Background technique

[0002] At present, in the bridge foundation engineering, the bored pile foundation has occupied an important position. With the development of bored piles with large diameter and high depth, the performance of the mud retaining wall material has an increasing influence on the quality of the borehole. Mud is a vital and necessary material in drilling construction. Poor drilling mud will have the following effects: (1) The mud film cannot be formed or the mud skin adhesion is not good, which is easy to cause shedding and stabilize the hole wall Not enough, which is prone to shrinkage and hole collapse. (2) The mud with large specific gravity, low consistency and high sand content will form a thick mud skin, which will increase the side friction resistance of the pile. (3) Thick slurry ...

Examples

Embodiment 1

[0030] In parts by weight, weigh 60 parts of butyl acrylate, 6 parts of acrylic acid, 0.3 parts of N,N-methylenebisacrylamide, 0.3 parts of ammonium persulfate, 0.6 parts of ammonium bicarbonate, 3 parts of dodecyl Sodium sulfate, 60 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylene bisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, at room temperature at 280r Stir at 200r / min for 20min in a water bath at 60°C to obtain a pre-emulsion, add 1 / 3 of the ammonium persulfate to the pre-emulsion, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 10mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 30min at a speed of 240r / min in a water bath at 60°C, and keep warm for 2h to obtain polyacrylate Emulsion; then weigh 60 parts of cornstarch, 60 parts of polyacrylate emulsion, 12 parts of glycerol, 3 parts of dibutyl phthalat...

Embodiment 2

[0032] In parts by weight, weigh 70 parts of butyl acrylate, 7 parts of acrylic acid, 0.35 parts of N,N-methylenebisacrylamide, 0.35 parts of ammonium persulfate, 0.7 parts of ammonium bicarbonate, 3.5 parts of dodecyl Sodium sulfate, 70 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylenebisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, Stir at a speed of 220r / min for 25min to obtain a pre-emulsion, add 1 / 3 of ammonium persulfate to the pre-emulsion, and stir at a speed of 220r / min in a water bath at 65°C for 25min, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 15mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 35min at a speed of 260r / min in a water bath at 65°C, and keep warm for 34h to obtain polyacrylate Emulsion; then weigh 70 parts of cornstarch, 70 parts of polyacrylate emulsion, 14 parts of glycerol, 3...

Embodiment 3

[0034] In parts by weight, weigh 80 parts of butyl acrylate, 8 parts of acrylic acid, 0.4 parts of N,N-methylenebisacrylamide, 0.4 parts of ammonium persulfate, 0.8 parts of ammonium bicarbonate, 4 parts of dodecyl Sodium sulfate, 80 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylenebisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, at room temperature at 300r Stir at a speed of 40 min / min to obtain a pre-emulsion, add 1 / 3 of ammonium persulfate to the pre-emulsion, stir at a speed of 240 r / min for 30 min in a water bath at 70°C, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 20mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 40min at a speed of 280r / min in a water bath at 70°C, and keep warm for 4h to obtain polyacrylate Emulsion; then weigh 80 parts of cornstarch, 80 parts of polyacrylate emulsion, 16 parts o...

technical field

[0001] The invention relates to a preparation method of composite wall protection mud, which belongs to the technical field of wall protection materials. Background technique

[0002] At present, in the bridge foundation engineering, the bored pile foundation has occupied an important position. With the development of bored piles with large diameter and high depth, the performance of the mud retaining wall material has an increasing influence on the quality of the borehole. Mud is a vital and necessary material in drilling construction. Poor drilling mud will have the following effects: (1) The mud film cannot be formed or the mud skin adhesion is not good, which is easy to cause shedding and stabilize the hole wall Not enough, which is prone to shrinkage and hole collapse. (2) The mud with large specific gravity, low consistency and high sand content will form a thick mud skin, which will increase the side friction resistance of the pile. (3) Thick slurry ...

Examples

Embodiment 1

[0030] In parts by weight, weigh 60 parts of butyl acrylate, 6 parts of acrylic acid, 0.3 parts of N,N-methylenebisacrylamide, 0.3 parts of ammonium persulfate, 0.6 parts of ammonium bicarbonate, 3 parts of dodecyl Sodium sulfate, 60 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylene bisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, at room temperature at 280r Stir at 200r / min for 20min in a water bath at 60°C to obtain a pre-emulsion, add 1 / 3 of the ammonium persulfate to the pre-emulsion, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 10mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 30min at a speed of 240r / min in a water bath at 60°C, and keep warm for 2h to obtain polyacrylate Emulsion; then weigh 60 parts of cornstarch, 60 parts of polyacrylate emulsion, 12 parts of glycerol, 3 parts of dibutyl phthalat...

Embodiment 2

[0032] In parts by weight, weigh 70 parts of butyl acrylate, 7 parts of acrylic acid, 0.35 parts of N,N-methylenebisacrylamide, 0.35 parts of ammonium persulfate, 0.7 parts of ammonium bicarbonate, 3.5 parts of dodecyl Sodium sulfate, 70 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylenebisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, Stir at a speed of 220r / min for 25min to obtain a pre-emulsion, add 1 / 3 of ammonium persulfate to the pre-emulsion, and stir at a speed of 220r / min in a water bath at 65°C for 25min, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 15mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 35min at a speed of 260r / min in a water bath at 65°C, and keep warm for 34h to obtain polyacrylate Emulsion; then weigh 70 parts of cornstarch, 70 parts of polyacrylate emulsion, 14 parts of glycerol, 3...

Embodiment 3

[0034] In parts by weight, weigh 80 parts of butyl acrylate, 8 parts of acrylic acid, 0.4 parts of N,N-methylenebisacrylamide, 0.4 parts of ammonium persulfate, 0.8 parts of ammonium bicarbonate, 4 parts of dodecyl Sodium sulfate, 80 parts of deionized water, 1 / 3 of butyl acrylate, acrylic acid, N,N-methylenebisacrylamide, ammonium bicarbonate, sodium lauryl sulfate were added to deionized water, at room temperature at 300r Stir at a speed of 40 min / min to obtain a pre-emulsion, add 1 / 3 of ammonium persulfate to the pre-emulsion, stir at a speed of 240 r / min for 30 min in a water bath at 70°C, keep warm to obtain a seed emulsion, and add the remaining 2 / 3 Slowly add butyl acrylate to the seed emulsion at a dropping rate of 20mL / min, then add the remaining 2 / 3 of ammonium persulfate, stir for 40min at a speed of 280r / min in a water bath at 70°C, and keep warm for 4h to obtain polyacrylate Emulsion; then weigh 80 parts of cornstarch, 80 parts of polyacrylate emulsion, 16 parts o...

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