Synthetic and compounding method for polycarboxylic acid water reducer with adjustable adaptability
A technology of polycarboxylic acid and water reducer, which is applied in the field of preparation of compound polycarboxylate water reducer, which can solve the problems of inadaptability of water reducer cement varieties, limitation of water reducer adaptability, concrete slump, Water-reducing rate and compressive strength are unqualified to achieve the effect of increasing water-reducing rate, increasing ratio, and increasing adaptability
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0018] 1. The preparation method of polycarboxylic acid mother liquor X: Add modified polyether and pure water into a 1000L reaction kettle, stir evenly and heat to 60°C, add initiator aqueous solution A, and feed for the first time after 5 minutes, that is, add different Saturated acid aqueous solution (B solution) and reducing agent and molecular weight modifier aqueous solution (C solution), and then carry out feeding once every 30min, each feeding amount is shown in Table 1. Keep the reaction at 60°C, keep the reaction at 60°C for 1.5h, then dilute with pure water, cool down to 40°C, neutralize with 30% liquid caustic soda (such as NaOH) to pH = 6-7 to prepare polycarboxylic acid mother liquor X.
[0019] Table 1: Each feeding amount
[0020] the first time
the second time
the third time
the fourth time
the fifth time
the sixth time
Seventh time
Liquid B (kg)
4
8
12
16
20
24
Liqui...
Embodiment 1
[0042] Add 250kg of pure water to the 1000L reaction kettle, then add 475kg of modified polyether, stir and heat until the polyether is completely dissolved, when the temperature rises to 60°C, put in material B, stir for five minutes, and then put in 5min for the first time. Keep the temperature at 60±2°C, and feed once every 30 minutes. See the table below for the feeding method. After the last feeding, keep the temperature for 1.5 hours. After the heat preservation reaction, add 300kg of water to dilute, cool down to 45°C, and add 30% liquid caustic soda (NaOH) neutralized to pH = 6 ~ 7 in the system.
[0043] Table 2: Each feeding amount
[0044] the first time
the second time
the third time
the fourth time
the fifth time
the sixth time
Seventh time
Liquid B (kg)
4
8
12
16
20
24
0
Liquid C (kg)
5.4
10.8
16.2
21.6
27
32.4
37.8
...
Embodiment 2
[0049]Add the modified polyether and pure water into a 1000L reaction kettle, stir evenly and heat to 60°C, add the initiator aqueous solution A solution, add 1 part of unsaturated acid aqueous solution (B solution) and 1 part of reducing agent and molecular weight adjustment at the same time after 5 minutes Agent aqueous solution (C liquid), the polycarboxylate mother liquor Y that the feeding method of continuous titration by peristaltic pump makes. Among them, liquid B was continuously titrated for 3 hours, and liquid C was continuously titrated for 3.5 hours. Keep the reaction at 60°C for 1.5h, then dilute with pure water, cool down to 40°C, and neutralize with 30% liquid caustic soda to pH=6-7.
[0050] Note: Liquid A is made of 4kg of hydrogen peroxide (27.5% concentration, industrial grade) and 20kg of primary water. When the temperature of the solution in the reactor rises to 60°C, put it in at one time, and start to throw in B and C after 5 minutes.
[0051] Liquid B...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More