Preparation method of plant-fiber foamed cement based heat insulating material for buildings

Abstract

The invention specifically relates to a preparation method of a plant-fiber foamed cement based heat insulating material for buildings. The preparation method comprises the following steps of: firstly, soaking plant fibers in dilute sulphuric acid with concentration being 0.1-0.2 mol / L for 50-80min, flushing until neutral, adding rosin and gelatin to the plant fibers in a mass ratio of plant fibers: rosin: gelatin being 1: (2-8): (2-10), regulating the pH value to 12-14, and then heating the solution to 85-90 DEG C, stirring for 120-150min, adding a fiber surface modifier after stopping heating, and then cooling to the room temperature, thus obtaining a fiber mixed solution; in use, stirring and foaming the fiber mixed solution in a stirrer having a rotating speed being 600 to 5000r / min for 2-4 min so as to obtain fiber foams; and then adding the fiber foams to cement and moulding, thus obtaining the plant-fiber foamed cement based heat insulating material. The plant-fiber foamed cement based material provided by the invention has the characteristics of excellent thermal insulation properties, low density, air shrinkage resistance, crack resistance and toughening, humidifying and the like.

Description

Technical field [0001] The invention specifically relates to a method for preparing a plant fiber foam cement-based thermal insulation material for building, which is mainly used in the field of building materials. Background technique [0002] Our country is a big agricultural country, with abundant agricultural and sideline products, many varieties and large quantities. According to statistics from relevant departments, the total annual output of crop straw in my country exceeds 700 million tons, including 213 million tons of rice straw, 112 million tons of wheat straw, 212 million tons of corn straw, and 200 million tons of other crop straw. However, in my country, the utilization rate of straw is very low, accounting for only about 5%. After the crops are harvested, in order to ensure the re-cultivation of the land, a large amount of crop stalks are burned, which not only wastes a lot of natural resources, but also pollutes the environment, causing serious carbon dioxide and...

AI Technical Summary

Problems solved by technology

The existing plant fiber building materials are a series of building materials produced by crushing one of various waste crop straws into plant fibers, adding reinforcing materials and bonding materials, including plant fiber cement hollow wall panels, plant Fiber gypsum reinforced blocks, plant fiber roof panels, etc. Most of these materials are directly mixed and bonded by plant fibers and cementitious materials. Generally, there are uneven mixing, easy aging, poor interface performance, and thermal insulation performance that cannot meet the requirements of energy-saving standards. And other issues

[0004] At present, there are many patents on the use of cement and plant fibers to prepare plant fiber cement composite building materials, such as a waste brick tile / straw foam concrete and its preparation method with the publication number of 102464497A, in which the plant fibers are only passed through alkali Direct use after soaking in the solution does not completely disperse the plant fibers. The plant fibers contain more impurities, and the bonding interface with other materials affects the performance of the material, and the lye is not fully utilized, which is likely to cause secondary pollution.

And the publication number is 102199044A a kind of composite fiber reinforced concrete and its preparation method, wherein the fiber mixed is the composite of chemical fiber and plant fiber, the mixing amount of plant fiber is low, the utilization rate of straw is low, and it is not environmentally friendly. purpose, and the surface of the plant fiber used has not been modified, the toughness is poor, and the combination with the cementitious material is poor