Polycarboxylic-acid plasticity stabilizer for wet-mixed mortar

Abstract

The invention discloses a polycarboxylic-acid plasticity stabilizer for wet-mixed mortar. The polycarboxylic-acid plasticity stabilizer is prepared from the following raw materials in percentage by mass: 10% to 15% of plasticity stabilizer main body, 0.4% to 0.8% of industrial white sugar, 0.15% to 0.5% of sodium tripolyphosphate, 0.2% to 0.8% of polyvinyl alcohol, 1.5% to 2.5% of air entraining agent, 0.02% to 0.05% of foam stabilizer and the balance of water, wherein the plasticity stabilizer main body is a mixture of a polycarboxylic acid water reducing agent and a polycarboxylic acid slump retaining agent. In the plasticity stabilizer main body, the mass ratio of the polycarboxylic acid water reducing agent to the polycarboxylic acid slump retaining agent is (1 to 3): (7 to 9). The polycarboxylic acid water reducing agent has the solid content of 40%. The polycarboxylic-acid plasticity stabilizer is high in water retention property, low in use level, high in flexibility and low in cost and is beneficial to the water retention of the mortar and worker plastering. Through adding the plasticity stabilizer disclosed by the invention, the opening time of the mortar is not shorter than 12h, the volume weight is 1,680kg / m<3> to 1,780kg / m<3>, and the construction operability of the mortar is good.

Description

technical field [0001] The invention relates to the technical field of building material additives, in particular to a polycarboxylic acid wet-mixed mortar plastic stabilizer. Background technique [0002] With the country's urban construction advancing by leaps and bounds, and the higher and higher requirements for mortar quality, and the implementation of the "ban on cash" on construction sites in 2007, the market prospect of dry powder mortar is very promising. However, as the country's requirements for energy saving, consumption reduction, and environmental protection have increased, the problems of dry powder mortar have also become prominent: for example, the energy consumption caused by drying sand, the energy consumption caused by the mixing of dry materials such as dry sand, cement, fly ash, etc. Dust pollution, the site needs to be specially equipped with bulk dry powder mortar storage and mixing equipment, bagged dry powder mortar will cause secondary pollution on...

AI Technical Summary

Problems solved by technology

The plasticizer prepared by this method has a water retention rate of 98%, but it can only be used for dry powder mortar or mortar mixed on site. It can only be mixed first and used immediately, and cannot meet the requirements of wet mixed mortar.

On December 3, 2014, an authorized patent No. CN104177556A "a plastic stabilizer and its preparation method" was disclosed, which is characterized by A component alkenyl polyether acrylate, B component alkenyl polyether, C Component methacrylic acid, acrylic acid, maleic acid, maleic anhydride and their corresponding salts or a mixture of two, D component acrylamide, methacrylamide, N-methylolacrylamide , in the presence of an initiator, copolymerize at a temperature of 60-95°C for 4-8 hours, and neutralize to a pH value of 7-8. The plastic stabilizer of the invention has good dispersion and plastic retention, and the plasticity time reaches 24-48 The product of this invention has limited adjustable space and low product flexibility. Because the raw materials used in various places vary widely, it is difficult to make one product popular all over the world. It is necessary to adjust the product performance to meet the construction requirements of mortar. It is quite difficult to adjust the product synthesis formula and process through changes