CN1900006A - Magnesium oxychloride composite material and pteparing process - Google Patents

Abstract

The invention provides a magnesium oxychloride composite material and its preparation process, which is characterized in that it is composed of a colored glaze layer, a coupling agent, a base layer and glass fibers, wherein the weight composition of the base layer is: 20% to 30% of magnesium oxide, Baume 30-40% of magnesium chloride aqueous solution with a degree of 20-32, 30-45% of active additives, 0.6-1.2% of styrene-acrylic emulsion with a solid content greater than 45% and 0.3-0.5% of modifiers, wherein the active additives consist of active Composed of fly ash and sulfuric acid waste residue, the weight ratio is 3:1-1.5; the coupling layer is dry non-metallic mineral particles of 40-60 mesh. When preparing, coat a layer of color glaze slurry on the polyester film, evenly spread a layer of coupling agent on the color glaze layer, and evenly spread a layer of base layer slurry on the coupling agent, so as to "three pastes and two Repeat the method of "cloth", and finally put a layer of polyester film on it, put the composite material body prepared by the above process on the mold and stop it for 24 hours to harden, peel off the polyester film to get a preliminary product, no re-halogenation, flooding Frost, deformation phenomenon, good appearance characteristics, performance meets or exceeds the national standard.

Description

Magnesium oxychloride composite material and its preparation process

Technical field

The invention provides a magnesium oxychloride composite material and a preparation process, belonging to the technical field of building materials.

Background technique

my country is rich in magnesia material resources, among which the reserve of magnesite is nearly 3 billion tons, and magnesium chloride is spread all over the salt mines along the coast. The development and application of magnesium oxychloride cementitious materials started in the early 20th century in China. Although the process is not very complicated, the production energy consumption is small, the product has the characteristics of energy saving, wood replacement, soil saving, water saving and low production cost. However, because the composition and phase structure of the hardening phase and the factors affecting its strength and strength are not very clear, especially the ingredients are unscientific and unreasonable. The phenomenon of high water absorption, with the application and development of magnesium oxychloride materials, people have taken many measures to overcome the above-mentioned shortcomings, some use chemicals as modifiers, and some use surface spraying waterproof substances, these cannot fundamentally Solve the above shortcomings, and the cost is high, causing secondary pollution of materials. How to make this energy-saving and environmentally friendly building material more widely used, from the performance of the material itself to the appearance of the product, is a problem that needs to be solved urgently. The present invention adopts scientific material proportioning and technical measures while reducing costs

Contents of the invention

The object of the present invention is to provide a magnesium oxychloride composite material and its preparation process which can overcome the above-mentioned defects, have low cost, no secondary pollution, excellent product performance and appearance. Its technical content is:

A magnesium oxychloride composite material is characterized in that it is composed of a colored glaze layer, a coupling agent, a base layer and glass fibers, wherein the weight composition of the base layer is: 20% to 30% of magnesium oxide, and 20% to 32% Baume 30-40% magnesium chloride aqueous solution, 30-45% active additive, 0.6-1.2% styrene-acrylic emulsion with a solid content greater than 45% and 0.3-0.5% modifier, wherein the active additive consists of activated fly ash and sulfuric acid waste residue Composition, the weight ratio is 3:1-1.5; the coupling layer is 40-60 mesh dry non-metallic mineral particles.

In the magnesium oxychloride composite material, the composition and weight ratio of the colored glaze layer are: 191 unsaturated resin: curing agent: accelerator: organic color paste is 1: 0.2: 0.3-0.6: 0.06-0.1.

In the magnesium oxychloride composite material, the non-metallic mineral particles of the coupling agent are one or more of quartz sand, broken glass, river sand, and granite.

In the magnesium oxychloride composite material, the composition and weight ratio of the modifying agent are phosphoric acid: superphosphate 1: 3-6.

In the magnesium oxychloride composite material, the glass fiber reinforcement material is a medium-alkali mesh cloth or a knife wire.

The preparation process of the magnesium oxychloride composite material is characterized in that it comprises the following steps:

(1) Mix 20-30% magnesium oxide, 30-40% magnesium chloride aqueous solution with a Baume degree of 20-32, 30-40% and 30-45% active additives, and add 0.6-1.2% solid content greater than 45% styrene-acrylic emulsion and 0.3-0.5% modifier, mixed evenly to make base slurry, 191 unsaturated resin, curing agent, accelerator and organic color paste in the ratio of 1:0.2:0.3-0.6:0.06 Mix to make colored glaze slurry;

(2) Evenly spread the color glaze slurry on the polyester film with a thickness of 200-300g/ ^m2 to form a color glaze layer, and evenly spread a layer of coupling glaze with a thickness of 250-400g/ ^m2 on the color glaze layer. On the coupling agent, evenly spread a layer of base slurry with a thickness of 1-1.5mm, then spread a layer of glass fiber reinforced material, and then spread a layer of base slurry with a thickness of 1-1.5mm 1. Spread a layer of glass fiber reinforced material, then spread a layer of base layer slurry with a thickness of 1-1.5mm, and finally cover with a layer of polyester film;

(3) Put the composite material body prepared by the above process on the mold to stop and harden for 24 hours, and remove the polyester film to obtain the preliminary finished product.

Its hardening mechanism is:

1. The main phase structure and phase composition of the gelation mechanical properties of magnesia materials air-condensed at room temperature are: 5Mg(OH) ₂ ·MgCl ₂ ·8H ₂ O. In production, what is the reaction molar ratio of magnesium oxide is the core of the technology. Its dosage is determined by gelling hardened bodies with different molar ratios of magnesium oxide/magnesium chloride to test the strength and waterproof of different ages. Performance, determine the physical and mechanical properties of the best components, and at the same time use X-ray diffraction and electron microscopic observation to determine the phase composition and optimal dosage of the components. The molar ratio of magnesium oxide/magnesium chloride should be greater than 5, which is a basic in principle. The magnesia used to determine the ratio should be active magnesia, that is, magnesia that undergoes a hydration reaction at room temperature (10°C to 35°C) and within a specific period of time, because magnesia is susceptible to moisture or absorbs air during storage. The moisture in the brucite forms brucite, which reduces the activity. Therefore, the production enterprise must measure the active magnesium oxide content in the light-burned powder from time to time, adjust the dosage and proportion of magnesium chloride, and overcome the problem of back halogenation and pan-halogenation with a dynamic and scientific proportion. frost phenomenon;

2. The influence of styrene-acrylic emulsion and modifier: the addition of active fly ash and active sulfuric acid waste residue can effectively inhibit the halogen return. The principle is that their addition can not only reduce the cost but also effectively form MgSiO ₃ with Mg ²⁺ And 3MgHPO ₃ 3H ₂ O and other crystalline gelling compounds with strong water resistance, and change the junction of magnesium oxychloride double salt, enhance the penetration and adhesion between crystals, thereby improving the strength and water resistance of the material. The active substance not only participates in the hardening reaction, but also can absorb free MgCl ₂ and CaO, thereby improving the strength of the oxychloride coal material and inhibiting the return of halogen. Prior to this, inert minerals such as talcum powder or calcium carbonate powder were used, and the cost was high and the effect was small. In this technology, polymer styrene-acrylic emulsion and phosphide modifier are added, which can block the capillary channel of the material, prevent the free frosting substances from overflowing, reduce the water absorption rate, and at the same time, it can also improve the later strength of the material.

3. Glaze layer: A layer of polymer material is organically compounded on the surface of the magnesium oxychloride gelling material, which can more thoroughly solve the problems of frost return, high water absorption, weak appearance decoration, and poor gloss durability.

4. Coupling agent: The use of coupling agent can make the base layer and the colored glaze layer firmly organically combined. The principle is that one end of the dry solid particle is firmly combined with the organic material, and the other end is firmly combined with the inorganic material. Colored solid particles can also play a very good decorative effect.

The magnesium oxychloride composite material obtained by this technology has no phenomenon of halogen return, frosting and deformation, good appearance, low water absorption, high strength and low cost. It is currently an ideal building composite material and can be further processed into roofing The performance of tiles, boards, insulation boards, etc. meets or exceeds the relevant standards of the People's Republic of China.

Detailed ways

Example 1:

(1) Phosphoric acid and superphosphate are mixed in a weight ratio of 1:3 to prepare a modifier, active fly ash and sulfuric acid waste residue are mixed in a weight ratio of 3:1.2 to make an active additive, and magnesium oxide , the magnesium chloride aqueous solution with a Baume degree of 25 and the active additive are mixed in a weight ratio of 23:33:44, and 0.8% styrene-acrylic emulsion with a solid content greater than 45% and 0.35% modifier are added, and the base layer is made by mixing evenly slurry;

(2) Mix 191 unsaturated resin, curing agent, accelerator and organic color paste in a ratio of 1:0.2:0.4:0.06 to make color glaze slurry;

(3) Spread the colored glaze slurry evenly on the polyester film with a thickness of 240g/ ^m2 to form a colored glaze layer, and evenly spread a layer of 40 mesh dry quartz sand with a thickness of 280g/ ^m2 on the colored glaze layer Coupling agent, on the coupling agent, evenly spread a layer of base slurry with a thickness of 1.5mm, then spread a layer of 0.5mm thick knife wire, and then spread a layer of base slurry with a thickness of 1.5mm 1. Spread a layer of 0.5mm thick knife wire, then spread a layer of base layer slurry with a thickness of 1.5mm, and finally cover with a layer of polyester film;

(4) Put the composite material body prepared by the above process on the mold to stop and harden for 24 hours, and remove the polyester film to obtain the preliminary finished product.

Example 2:

(1) Phosphoric acid and superphosphate are mixed in a weight ratio of 1:5 to prepare a modifier, active fly ash and sulfuric acid waste residue are mixed in a weight ratio of 3:1.4 to make an active additive, and magnesium oxide , the magnesium chloride aqueous solution with a Baume degree of 30 and the active additive are mixed in a weight ratio of 28:38:34, and 1% of styrene-acrylic emulsion with a solid content greater than 45% and 0.45% of modifier are added, and the base layer is made by mixing evenly slurry;

(2) Mix 191 unsaturated resin, curing agent, accelerator and organic color paste in a ratio of 1:0.2:0.6:0.1 to make color glaze slurry;

(3) Spread the colored glaze slurry evenly on the polyester film with a thickness of 300g/ ^m2 to form a colored glaze layer, and evenly spread a layer of 60-mesh dry broken glass with a thickness of 360g/ ^m2 on the colored glaze layer Coupling agent, on the coupling agent, evenly spread a layer of base slurry with a thickness of 1mm, and then spread a layer of medium-alkali mesh cloth, and then spread a layer of base slurry with a thickness of 1mm. A layer of medium-alkali mesh cloth, then spread a layer of base slurry with a thickness of 1mm, and finally cover with a layer of polyester film;

(4) Put the composite material body prepared by the above process on the mold to stop and harden for 24 hours, and remove the polyester film to obtain the preliminary finished product.

Claims (6)

1, a kind of chloromagnesia composite, it is characterized in that being composited by glazed colour layer, coupling agent, basic unit and glass fibre, wherein the weight of basic unit consists of: magnesium oxide 20～30%, degree Beaume is 20～32 magnesium chloride brine 30～40%, active additive 30～45%, other adds solid content greater than 45% benzene emulsion 0.6～1.2% and properties-correcting agent 0.3～0.5%, and wherein active additive is made up of active fly ash and waste residue of sulfuric acid, and part by weight is 3: 1～1.5; Coupling layer is 40～60 order exsiccant nonmetalliferous ore composition granules.

2, chloromagnesia composite as claimed in claim 1 is characterized in that: the component of glazed colour layer and weight proportion are: 191 unsaturated polyesters: solidifying agent: promotor: organic mill base is 1: 0.2: 0.3～0.6: 0.06～0.1.

3, chloromagnesia composite as claimed in claim 1 is characterized in that: the nonmetalliferous ore composition granule of coupling agent be quartz sand, glass cullet, river sand, granitic one or more.

4, chloromagnesia composite as claimed in claim 1 is characterized in that: the component of properties-correcting agent and weight proportion are phosphoric acid: calcium superphosphate is 1: 3～6.

5, chloromagnesia composite as claimed in claim 1 is characterized in that: glass fibre reinforcement is the middle alkali grid cloth or the silk of operating on.

6, a kind of technology of making the described chloromagnesia composite of claim 1 is characterized in that comprising following steps:

(1) be that 20～32 magnesium chloride brine 30～40% and 30～45% active additive mix with 20～30% magnesium oxide, 30～40% degree Beaume, other adds 0.6～1.2% solid content greater than 45% benzene emulsion and 0.3～0.5% properties-correcting agent, mix and make basic unit's slurry, 191 unsaturated polyesters, solidifying agent, promotor and organic mill base are made the colored glaze slip with 1: 0.2: 0.3～0.6: 0.06 mixed;

(2) with the colored glaze slip with 200～300g/m ²Thickness evenly be laid on and form glazed colour layer on the polyester film, evenly spreading one layer thickness is 250～400g/m on glazed colour layer ²Coupling agent, on coupling agent, evenly spread again and smear basic unit's slurry that a layer thickness is 1～1.5mm, repave and apply the layer of glass strongthener, repave then and smear the deposited layer of glass strongthener in basic unit's slurry, shop that a layer thickness is 1～1.5mm, repave and smear basic unit's slurry that a layer thickness is 1～1.5mm, last bedding last layer polyester film;

(3) composite bodies that said process is made places and quietly on the mould stopped hardening 24 hours, takes polyester film off and can obtain preliminary finished product.