Production technology for physical foaming cement insulation boards

Abstract

The invention discloses a production technology for physical foaming cement insulation boards, and belongs to the field of building insulation materials. The technology comprises the steps that 1, general purpose portland cement, a composite aluminosilicate mineral admixture and a composite additive are metered and prestirred to obtain solid materials, and water is added for wet grinding to obtain non-bleeding unstratified slurry; 2, fiber is added into the slurry, and then high-speed stirring and dispersion are performed; then, foams with the diameter smaller than 0.3 mm are added to form foam bodies; 3, the foams obtained in the second step are molded by means of a mold, maintained and demolded and then cut into boards, high-molecular polymer waterproof lotion uniformly permeates microholes of the boards, and artificial drying or natural air-drying is performed to obtain the physical foaming cement insulation boards. According to the technology, high-pressure permeation equipment is adopted for enabling the high-molecular polymer waterproof lotion to rapidly and uniformly permeate the microholes of the boards, polymer inside the lotion will form films on the walls of the microholes after artificial drying or natural air-drying, passages of pores are blocked, the water absorption rate of the insulation boards can be effectively lowered, the toughness and strength of the boards can be improved, and board cracks are avoided.

Description

technical field [0001] The invention belongs to the field of building thermal insulation materials, and in particular relates to a production process of a physically foamed cement thermal insulation board. Background technique [0002] Since I used organic foam insulation boards for foreign wall insulation, fires have occurred repeatedly, which have caused huge losses to the lives and property of our people. For this reason, the National Fire Protection Bureau issued a document (65 [2011]), requiring "banning organic foam insulation boards". This has injected a strong impetus into the development of foam concrete insulation boards. With the promulgation and implementation of my country's wall reform and building energy-saving policies, and affected by building fires, modern energy-saving green buildings urgently need non-combustible thermal insulation materials with excellent thermal insulation performance, waste utilization, and light weight. As a new type of building mate...

AI Technical Summary

Problems solved by technology

In the prior art, early-strength, fast-setting special cement (mainly sulphoaluminate cement, iron-aluminate cement, etc.) is often used as the cementitious material, and ultra-light foamed concrete is prepared by chemical foaming, such as Publication No. "A kind of ultra-low density foam concrete and its preparation method" disclosed by CN101508593A, it is prepared by chemical foaming, the molding control is difficult, and it is only suitable for the production of preforms

On the other hand, sulphoaluminate cement is used, which is a special cement. The resources of special cement are relatively scarce, the cost is high, and there are durability problems, which hinder the development of ultra-light foam concrete.

The new foam concrete prepared by physical foaming has good workability, can be prefabricated and cast-in-place, and shows great advantages. Portland cement, I or II fly ash, granulated blast furnace slag powder and other raw materials, but the physical method of ultra-light foam concrete needs to be realized by adding expansion agents. There are many kinds of expansion agents on the market, and the quality is uneven. And most of them are fired at high temperature, not only high cost, expensive, high energy consumption, but also the quality is still controversial, and the practicability is poor