CN105384380A - Tannin extract/polycarboxylate concrete water reducer and preparation method thereof - Google Patents

Abstract

The invention discloses a tannin extract/polycarboxylate concrete water reducer. The tannin extract/polycarboxylate concrete water reducer is prepared from the following raw materials by weight: 2 to 4 parts of polyvinyl alcohol, 3 to 5 parts of tannin extract, 4 to 6 parts of hydrogen peroxide with a concentration of 20 to 30%, 0.1 to 0.2 part of polysorbate-80, 40 to 50 parts of modified polycarboxylate mother liquor, 1 to 2 parts of sodium humate, 1 to 2 parts of sorbitol, 0.2 to 0.4 part of polyoxyethylene nonyl phenyl ether and 40 to 50 parts of water. The water reducer has good compatibility with cement, is small in doping amount and high in a water reducing rate, can improve the bonding strength of cement, strengthen the compression resistance and fracture resistance of concrete and enhance the strength of concrete, effectively prevents corrosion of steel bars in concrete, prolongs the service life of the steel bars, and has a high practical value.

Description

A kind of tannin extract/polycarboxylic acid concrete water reducer and preparation method thereof

Technical field

The present invention relates to chemical assistant technical field, particularly relate to a kind of tannin extract/polycarboxylic acid concrete water reducer and preparation method thereof.

Background technology

Cement water reducing agent is one of staple product of building materials industry, in concrete mix, add Water-reducing Admixtures To Cements particle have dissemination, the mobility of concrete mix can be improved, reduce unit cement consumption, save cement, ensure concrete workability and intensity simultaneously.Water reducer conventional at present mainly contains lignin sulfonate, naphthalene water reducer class and poly carboxylic acid series water reducer class.Poly carboxylic acid series water reducer has the advantages such as water-reducing rate is high, reinforced effects is remarkable, concrete workability better, environmental protection, is the water reducer of most application prospect in recent years.But in actual concrete works uses, there is the problem with cement consistency in poly carboxylic acid series water reducer, its result of use affects larger by cement moiety.Time particularly containing compositions such as clays, due to the Inter layer adsorption effect of clay, serious on the diminishing dispersing property impact of polycarboxylate water-reducer, concrete serviceability is reduced, constrains widespread use and the development of poly carboxylic acid series water reducer.And current domestic poly carboxylic acid series water reducer product development is not yet ripe, of less types, is difficult to content with funtion, the diversified market requirement, need further exploitation and perfect.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of tannin extract/polycarboxylic acid concrete water reducer and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of tannin extract/polycarboxylic acid concrete water reducer, it is obtained by the raw material of following weight parts:

Polyvinyl alcohol 2-4, tannin extract 3-5,20%-30% hydrogen peroxide 4-6, citric acid 1-2, Tween-80 0.1-0.2, modified polycarboxylic acid mother liquor 40-50, Sodium salts humic acids 1-2, sorbyl alcohol 1-2, polyoxyethylene nonylphenol ether 0.2-0.4, water 40-50;

Wherein modified polycarboxylic acid mother liquor is made up of the raw material of following weight part: vinylformic acid 30-40, methyl methacrylate 10-15, poly glycol monomethyl ether 10-15, feather protein 3-5, carboxymethyl cellulose 3-5, Potassium Persulphate 0.5-1, water 100-150; The preparation method of modified polycarboxylic acid mother liquor be carboxymethyl cellulose, feather protein and Potassium Persulphate are added 1/2-2/3 amount water in 60-80 DEG C stir 0.5-1h obtain A liquid, all the other raw materials are mixed to obtain B liquid, again A liquid and B liquid are added 70-80 DEG C of stirring reaction 4-6h in reactor jointly, after cooling, pH is adjusted to 8-9, obtains final product.

A preparation method for tannin extract/polycarboxylic acid concrete water reducer, comprises the following steps:

(1) raw material is taken by weight, first Tween-80, polyoxyethylene nonylphenol ether and citric acid are added to the water and dissolve completely, add polyvinyl alcohol again and stir 1-2h prior to 80-90 DEG C, then temperature is adjusted to 50-60 DEG C, add 20%-30% hydrogen peroxide and stir 4-6h, after cooling, pH is adjusted to 8-9, finally adds tannin extract and stir, obtain mixed solution;

(2) after being mixed with modified polycarboxylic acid mother liquor by the mixed solution in (1), 70-80 DEG C is stirred 0.5-1h, adds all the other raw material stirring evenly, obtain tannin extract/polycarboxylic acid concrete water reducer after cooling.

Advantage of the present invention is:

Tannin extract is the natural active matter extracted from plant, and main component is phenolic compound, can promote infiltration, dispersing property and metal surface anticorrosive.The present invention is by the introducing of feather protein and carboxymethyl cellulose pluronic polymer, make the modified polycarboxylic acid mother liquor of synthesis good to cement adaptability, effectively can reduce the Inter layer adsorption of clay, there is good diminishing dispersing property, composite simultaneously by raw materials such as tannin extracts, the Water-reducing Admixtures To Cements obtained is made to have good consistency, volume is little, water-reducing rate is high, the cohesive strength of cement can be improved, the resistance to compression of Concrete Structure, fracture resistance, improve concrete intensity, and effectively can prevent the corrosion of reinforcement in concrete, extend the work-ing life of reinforcing bar, there is higher practical value.

Embodiment

A kind of tannin extract/polycarboxylic acid concrete water reducer, it is obtained by the raw material of following weight parts:

Polyvinyl alcohol 2, tannin extract 3,20% hydrogen peroxide 4, citric acid 1, Tween-80 0.1, modified polycarboxylic acid mother liquor 40, Sodium salts humic acids 1, sorbyl alcohol 1, polyoxyethylene nonylphenol ether 0.2, water 40;

Wherein modified polycarboxylic acid mother liquor is made up of the raw material of following weight part: vinylformic acid 30, methyl methacrylate 10, poly glycol monomethyl ether 10, feather protein 3, carboxymethyl cellulose 3, Potassium Persulphate 0.5, water 100; Carboxymethyl cellulose, feather protein and Potassium Persulphate are added 60 DEG C of stirring 0.5h in the water of 1/2 amount to obtain A liquid by the preparation method of modified polycarboxylic acid mother liquor, all the other raw materials are mixed to obtain B liquid, again A liquid and B liquid are added 70 DEG C of stirring reaction 4h in reactor jointly, after cooling, pH is adjusted to 8, obtains final product.

A preparation method for tannin extract/polycarboxylic acid concrete water reducer, comprises the following steps:

(1) raw material is taken by weight, first Tween-80, polyoxyethylene nonylphenol ether and citric acid are added to the water and dissolve completely, add polyvinyl alcohol again and stir 1h prior to 80 DEG C, then temperature is adjusted to 50 DEG C, add 20% hydrogen peroxide and stir 4h, after cooling, pH is adjusted to 8, finally adds tannin extract and stir, obtain mixed solution;

(2) mixed solution in (1) is mixed latter 70 DEG C with modified polycarboxylic acid mother liquor and stir 0.5h, add all the other raw material stirring after cooling evenly, obtain tannin extract/polycarboxylic acid concrete water reducer.

Adopt reference cement, as shown in the table to the concrete experiments result of above-mentioned obtained water reducer:

Table one: concrete mixture characteristic (the solid volume 0.5% of water reducer)

Index	Air content	Compressive strength rate (28d)	Shrinkage ratio (28d)
				Test result	2.9%	168%	105%

Carry out paste flowing degree test with above-mentioned obtained water reducer to the cement that difference forms, result is as follows:

Table two: the dispersiveness of water reducer in difference composition cement

Cement type	Water reducer volume (%)	Initial flow degree (mm)	1h degree of mobilization (mm)
				Plain cement	0.5	255	248
Silt content 5% cement	0.5	242	237

Claims (2)

1. tannin extract/polycarboxylic acid concrete water reducer, is characterized in that, it is obtained by the raw material of following weight parts:

Polyvinyl alcohol 2-4, tannin extract 3-5,20%-30% hydrogen peroxide 4-6, citric acid 1-2, Tween-80 0.1-0.2, modified polycarboxylic acid mother liquor 40-50, Sodium salts humic acids 1-2, sorbyl alcohol 1-2, polyoxyethylene nonylphenol ether 0.2-0.4, water 40-50;

Described modified polycarboxylic acid mother liquor is made up of the raw material of following weight part: vinylformic acid 30-40, methyl methacrylate 10-15, poly glycol monomethyl ether 10-15, feather protein 3-5, carboxymethyl cellulose 3-5, Potassium Persulphate 0.5-1, water 100-150; The preparation method of modified polycarboxylic acid mother liquor be carboxymethyl cellulose, feather protein and Potassium Persulphate are added 1/2-2/3 amount water in 60-80 DEG C stir 0.5-1h obtain A liquid, all the other raw materials are mixed to obtain B liquid, again A liquid and B liquid are added 70-80 DEG C of stirring reaction 4-6h in reactor jointly, after cooling, pH is adjusted to 8-9, obtains final product.

2. the preparation method of a kind of tannin extract/polycarboxylic acid concrete water reducer according to claim 1, is characterized in that, comprise the following steps:

(1) raw material is taken by weight, first Tween-80, polyoxyethylene nonylphenol ether and citric acid are added to the water and dissolve completely, add polyvinyl alcohol again and stir 1-2h prior to 80-90 DEG C, then temperature is adjusted to 50-60 DEG C, add 20%-30% hydrogen peroxide and stir 4-6h, after cooling, pH is adjusted to 8-9, finally adds tannin extract and stir, obtain mixed solution;

(2) after being mixed with modified polycarboxylic acid mother liquor by the mixed solution in (1), 70-80 DEG C is stirred 0.5-1h, adds all the other raw material stirring evenly, obtain tannin extract/polycarboxylic acid concrete water reducer after cooling.