CN1069252A

CN1069252A - The manufacture method of high-strength fly-ash-alundum cement matrix material

Info

Publication number: CN1069252A
Application number: CN91105390A
Authority: CN
Inventors: 李�浩; 玉保全
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-08
Filing date: 1991-08-08
Publication date: 1993-02-24

Abstract

High-strength fly-ash-alundum cement matrix material is by producing on the basis of composition, prescription, the technology of existing high-strength alundum cement MDF matrix material being done major reform.This material is except that intensity is lower than cement MDF matrix material slightly, and other physics, chemistry, mechanical property all reach or be better than cement MDF material.Particularly it has overcome the susceptibility and the high rate of expansion of existing serious water in the cement MDF matrix material preferably, have after goods solidify indeformable, do not analyse white characteristics, and technology is simple, easy to operate, and material cost also only is 1/3rd of a cement MDF material.

Description

The manufacture method of high-strength fly-ash-alundum cement matrix material

The invention belongs to production technology for non-metallic material.

Behind alundum cement and the water mixed hardening, it is very low that its flexural strength can only reach 7～9MPa intensity.For improving intensity, Japanese kokai publication sho 57-29853 patent proposes to add the water-soluble polyvinyl acetate of an amount of (8～10 parts) part alkalization when alundum cement mixes with suitable quantity of water, this mixture is through stirring, rolling repeatedly, technologies such as last moulding, curing, it has eliminated existing a large amount of macroscopic defectss in alundum cement and the water mixed hardening body material that is obtained, its flexural strength can reach 100～120MPa, and have good normal temperature plasticity-, this material be otherwise known as (Macrodefects free cements) be the MDF cement composite material.But because it contains molten waterborne polymeric, therefore in use, bill of material reveals serious water sensitivity; Polymers swell goods gross distortion.The molten water of polymkeric substance, suction is softening, makes the release of material internal stress and introduces a large amount of defectives, finally causes the strength of materials to descend rapidly.In addition, in material preparation, because water cement ratio is lower, aquation can not fully be carried out, and cement analyses the also very serious production cost simultaneously of white phenomenon than 3～4 times of general alundum cement sclerosis heights in use.

European patent 0038126A utilizes 30% flyash partly to replace alundum cement, in production technique, other composition, fill a prescription complete and the identical situation of Japanese kokai publication sho 57-29853 patent, composite material strength drops to about 80MPa, but production cost slightly reduces, analyse white phenomenon and obviously improve yet, yet the water sensitivity problem is not resolved.

In order to improve water repelling property, Japanese kokai publication sho 60-118659 patent is in the Vinyl Acetate Copolymer blended while of alundum cement and water and an amount of part alkalization, add an amount of organic dicarboxylic acid or Succinic Acid again, and be 60～120 ℃ in temperature, pressure is 200～250kg/cm ²The condition compacted under, thus MDF cement composite material water repelling property is obviously improved.But weak point be in the forming process under elevated pressures long-time heating, industrial production very inconvenience simultaneously the additive price is more expensive, improved production cost greatly.It is still comparatively serious to analyse white phenomenon.Chinese patent publication number CN1042893A attempts to replace organic dicarboxylic acid with appropriate hydrochloric acid, simplified production technique, reduced cost, but the anti-water effect of material is not as good as the former.Particularly anti-high-temperature water ability more than 70 ℃.

Chinese patent publication number CN1042140A adopts formaldehyde-sulfuric acid liquid under 70 ℃ of temperature the MDF cement composite material to be carried out surface treatment, make the goods top layer form certain thickness acetalation processing layer, the water sensitivity and the water permeability of goods have been improved effectively, thereby obtain comparatively good anti-outlet capacity, but production technique is still comparatively complicated, and cost is also higher.

For overcoming above-mentioned deficiency, the purpose of this invention is to provide that a kind of water sensitivity is low, rate of expansion is little, water repelling property is good, and technology is simple, the manufacture method of high-strength fly-ash with low cost-alundum cement matrix material.

The main points of present method are alkalization degree used in the current methods to be lower than 88% water-soluble polyvinyl acetate (3～5 parts) mix with suitable quantity of water (15～20 parts), treat polymkeric substance complete molten when being transparent pasty state and 3～5 parts of vinyl acetate-ethylene copolymerization emulsions (BJ-705VAE emulsion) join together in the mixture of 60～90 parts of flyash and corresponding 40～10 parts of alundum cements.Through stirring, rolling repeatedly, treat that various species distribution evenly show the rubber shape finishing is led in its roll forming.In order further to improve the flexural strength and the shock resistance of material, can be between two already formed materials compound one deck alkali resistant glass fiber cloth or nylon fiber cloth, grid is generally with about 4 * 4(mm) better.The material of above prepared 3MPa pressure, 80 ℃ of temperature hot pressing 10～15 minutes, can obtain flyash one alundum cement matrix material at last.After above processing, not redeformation of resulting product, but to reach maximum intensity, also need room temperature to place about ten days.In addition, the present invention also finds, Vinyl Acetate Copolymer alkalization degree must not be greater than 88%, otherwise can give stir, rolling evenly and moulding bring difficulty, the VAE consumption is excessive also analogue can to occur.

The present invention replaces the alkalization Vinyl Acetate Copolymer of molten water with vinyl acetate-ethylene copolymerization emulsions with low cost (BJ-705VAE emulsion) part, simultaneously with flyash as main raw materials for production, flyash one alundum cement matrix material through certain production technique preparation, except that intensity a little less than the MDF cement composite material, other over-all properties all reaches or is better than the latter, it has overcome existing serious water sensitivity and rate of expansion in the MDF cement composite material substantially simultaneously, has the characteristics that are difficult for deformation after the curing.Production cost only is 1/3rd of a MDF cement composite material.Technology is simple, easy to operate.

(table 1) and (table 2) seen in flyash-alundum cement matrix material and MDF cement composite material over-all properties and water repelling property contrast respectively.Flexural strength is all carried out three-point bending by the GB1042-79 test method and is surveyed, and its data are 10 mean values of measuring.

Claims

1, the manufacture method of high-strength fly-ash-alundum cement matrix material is with flyash, alundum cement, water-soluble polyvinyl acetate, suitable quantity of water, through mixing, stirring, rolling, at pressure 3MPa, under 80 ℃ of the temperature, solidification treatment 10～15 minutes is characterized in that:

The water-soluble polyvinyl acetate of a, 3～5 parts of alkalization mixes with 15～12 parts of water;

B, treat the complete molten transparent pasty state that shows of polymkeric substance, join in the mixture of 60～90 parts of flyash and corresponding 40～10 parts of high-alumina cements with 3～5 parts of vinyl acetate-ethylene copolymerization latexes;

Before c, the curing, each uniform component distribution shows rubber-like, compound betwixt one deck nylon fiber or glass fiber mesh.

2, the manufacture method of high-strength fly-ash according to claim 1-alundum cement matrix material is characterized in that poly-its alkalization degree of vinegar ethene of the molten water-based that alkalizes described in a is lower than 88%.