Light-weight foamed magnesia wall slab

Abstract

A light-weight foamed wall slab is prepared from magnesium oxide (1070 wt. portions), magnesium chluride (60-70), water (20-50), stabilizer (5-26), short fibres (2-15), modifier (1.65-9), foaming agent (0.8-8), and water-resisting agent (0.15-1) through mixing while stirring, foaming and solidifying. Its advantages are high effect, low cost of modifier, light dead weight, high strength, and low cost.

Description

technical field [0001] The invention relates to a non-load-bearing wallboard used in various high and low-rise buildings, in particular to a magnesium oxide foamed lightweight wallboard. Background technique [0002] Since the state banned the use of soil as solid bricks, various wall panels have appeared one after another, such as cement hollow brick walls, which have affected the overall promotion due to their heavy weight, large volume, and large floor space. [0003] However, various lightweight wallboards disclosed in recent years have some deficiencies, such as the alkali-free glass fiber reinforced low-alkali cement slab is expensive, and the grid-coated glass fiber low-alkali cement replacing it is expensive. The self-weight of the wallboard is heavy (80kg / m 2 ), and cement has high requirements for maintenance, either the investment is too large, or the strength is low. Another example is that a kind of side surface is made of steel wire gr...

AI Technical Summary

Problems solved by technology

[0002] Since the state banned the use of soil as solid bricks, various wall panels have appeared one after another, such as cement hollow brick walls, which have affected the overall promotion due to their heavy weight, large volume, and large floor space.

[0003] However, various lightweight wallboards disclosed in recent years have some deficiencies, such as the alkali-free glass fiber reinforced low-alkali cement slab is expensive, and the grid-coated glass fiber low-alkali cement replacing it is expensive. The self-weight of the wallboard is heavy (80kg / m 2 ), and cement has high requirements for maintenance, either the investment is too large, or the strength is low

Another example is a wallboard made of steel wire grid concrete on both sides and a lightweight filling layer such as foamed plastic in the middle, which has the disadvantages of inconvenient pipeline installation, complicated production process, and expensive filling layer.

A hollow lightweight cement wallboard recently appeared, which has the properties of fire prevention, moisture resistance, heat insulation, sound insulation, etc. It is light in texture and easy to install pipelines. Thin (approximately 1-1.2 cm), it gives the user a sense of insecurity and insecurity. If the wall is knocked, it will produce a resonance sound. At the same time, it is impossible to nail and install expansion bolts, etc., which brings inconvenience to use.

[0004] The Chinese patent literature discloses a light-weight wallboard made mainly of magnesium chloride, magnesium oxide and polystyrene foam, but there are still several deficiencies: because it is not foamed, the weight is relatively heavy; the surface strength is not enough; if In case of fire, polystyrene may release toxic gas when exposed to high temperature

The amount of its addition is relatively large, and there are the following disadvantages through the test: high cost; damage to the magnesium oxide structure (expressed as a decrease in strength); difficulty in forming control

To solve the technical problem of magnesium oxide foaming, it must be modified. Most of them agree with the propylene styrene emulsion with better effect, but because the cost is too high (about 6000 yuan / ton), it is applied on the wall, and it has almost no industrial advantages. production value