CN103951306A

CN103951306A - Modified aliphatic water reducer and preparation method thereof

Info

Publication number: CN103951306A
Application number: CN201410144510.6A
Authority: CN
Inventors: 余振春; 余秀龙; 林为祥
Original assignee: FUQING YONGCHUN CONCRETE ADMIXTURE Co Ltd
Current assignee: FUQING YONGCHUN CONCRETE ADMIXTURE Co Ltd
Priority date: 2014-04-11
Filing date: 2014-04-11
Publication date: 2014-07-30

Abstract

The invention discloses a modified aliphatic water reducer. The modified aliphatic water reducer is prepared by using sodium bisulfite as a sulfonating agent and ketones as condensation monomers and performing steps of dissolving, sulfonation, molecule reforming, cooling and the like. The prepared modified aliphatic water reducer overcomes the disadvantages that aliphatic water reducers on market are relatively low in water-reducing rate and bad in cohesiveness and water-holding capacity, and separation of concrete and water segregation are easy to happen; and the production cost is saved, the strength of concrete is improved, and the modified aliphatic water reducer has wide application prospect.

Description

A kind of modified aliphatic water reducing agent and preparation method thereof

Technical field

The present invention relates to cement water reducing agent field, refer in particular to a kind of modified aliphatic water reducing agent and preparation method thereof.

Background technology

Along with the development of concrete technology, concrete multiple performance is all had higher requirement, such as mobility is large, protect and collapse that the time is long, hydration heat is low, intensity is high and good endurance etc., and energy efficient as far as possible, reduces costs and the economic requirement such as rapid construction.Engineering practice proves, concrete admixture can not only make concrete obtain premium properties, also can meet numerous different engineering construction demands simultaneously, and therefore concrete admixture has become requisite component in concrete.

Aliphatic water reducing agent uses more admixture as concrete admixture market, will join in concrete, if keep water cement ratio constant, can effectively improve the concrete slump; If reduce water cement ratio, can obtain the good concrete of flowing property, be easy to moulding closely knit, and can improve significantly concrete intensity.But the aliphatic water reducing agent water-reducing rate that prior art is produced is on the low side, glutinous poly-property and poor water retention property, easily cause concrete isolation rate and bleeding, can not meet concrete requirement of strength in Practical Project.

Summary of the invention

One of object of the present invention is to provide a kind of preparation method of high performance modified aliphatic water reducing agent, and it comprises the following steps:

1) dissolve: in reactor, add 400～450 parts, water, add 135～140 parts of sulphonating agents simultaneously, be stirred to abundant dissolving;

2) sulfonation: drop into again 100～105 parts, acetone in reactor, then reactor is warmed up to 45～50 DEG C of sulfonation 1～1.5 hour; It is incomplete that reaction times crosses short reaction, the long production efficiency that affects of reaction times;

3) condensation: reactor is raised to 95～98 DEG C, more slowly drips 290～300 parts, condensing agent formaldehyde in reactor, time for adding is controlled at 1～1.5 hour, drip too too fierceness of fast response, difficult control of temperature, the oversize production efficiency that affects of time for adding, constant temperature condensation 3～3.5 hours;

4) molecule is reformed: in reactor, add 10～15 parts of promoting agent maleic anhydrides, keep reactor temperature fully to react 3.5～4 hours at 95～98 DEG C;

5) cooling: temperature of reaction kettle drops to 60 DEG C of then dischargings below.

Described sulphonating agent is sodium bisulfite, S-WAT or Sodium Pyrosulfite.

Two of object of the present invention is to provide a kind of modified aliphatic water reducing agent of low-cost and high-performance, and it is made by above-mentioned preparation method.

It is on the low side that modified aliphatic water reducing agent of the present invention has overcome commercially available aliphatic water reducing agent water-reducing rate, stick poly-property and poor water retention property, easily cause the defect of concrete isolation rate and bleeding, saved production cost, improve concrete intensity, be with a wide range of applications.

Embodiment

Below preferred embodiment of the present invention is described in detail.

embodiment 1

A preparation method for modified aliphatic water reducing agent, it comprises the following steps:

1) dissolve: in reactor, add 400 parts, water, add 137 parts of sodium bisulfites simultaneously, stir 30 minutes;

2) sulfonation: drop into again 100 parts, acetone in reactor, then reactor is warmed up to 45 DEG C of sulfonation 1 hour;

3) condensation: reactor is raised to 95 DEG C, more slowly drips 290 parts, condensing agent formaldehyde in reactor, time for adding is controlled at 1 hour, constant temperature condensation 3.2 hours;

4) molecule is reformed: in reactor, add 10 parts of promoting agent maleic anhydrides, keep reactor temperature 95 DEG C of reactions 3.5 hours;

embodiment 2～6

Adopt the preparation method identical with embodiment 1, the respective value that difference is to use respectively addition, reaction times, the temperature value of each compositions different in each step listed in table 1 to replace embodiment 1 to adopt.

Table 1

Concrete properties data after the modified aliphatic water reducing agent modification making with embodiment 1-6 are as shown in table 2, concrete before the modification used of determination data in table is strong DEG C of concrete of C30, and its proportioning is: cement: sand: stone: water=1:1.18:2.63:0.41(mass ratio):

Table 2

As can be seen from Table 2, the concrete properties data after the modified aliphatic water reducing agent modification making with embodiment 1-6 are all better than GB, and its water-reducing rate is high, and bleeding rate is low, and air content is low, and sodium sulphate content is low, and concrete strength is higher.

Claims

1. a preparation method for modified aliphatic water reducing agent, comprises the following steps:

2) sulfonation: drop into again 100～105 parts, acetone in reactor, then reactor is warmed up to 45～50 DEG C of sulfonation 1～1.5 hour;

3) condensation: reactor is warmed up to 95～98 DEG C, more slowly drips 290～300 parts, condensing agent formaldehyde in reactor, time for adding is controlled at 1～1.5 hour, constant temperature condensation 3～3.5 hours;

2. the preparation method of modified aliphatic water reducing agent according to claim 1, is characterized in that, described sulphonating agent is sodium bisulfite, S-WAT or Sodium Pyrosulfite.

3. a modified aliphatic water reducing agent, the preparation method of its a kind of modified aliphatic water reducing agent according to claim 1 and 2 makes.