CN101947804B - Plant straw board and manufacturing method thereof - Google Patents

Abstract

The invention discloses a plant straw board and a manufacturing method thereof. The plant straw board consists of plant straws, magnesium oxide, magnesium chloride solution and curing accelerant, wherein the curing accelerant consists of fly ash, iron oxide yellow, active silicon dioxide and ferrous sulfate. The manufacturing method comprises the following steps of: drying the crop straws, removing impurities, and then crushing the straws into powder; and mixing and stirring magnesium oxide powder and magnesium chloride solution uniformly, adding the mixture into the powder, stirring the mixture uniformly, adding the curing accelerant into the mixture, stirring the mixture, putting the mixture into a die and pressing the mixture into the board. The manufacturing method can save the forestry and protect the environment. The plant straw board has the properties of light weight, sound insulation, heat insulation, moisture protection, abrasion resistance and the like, and has durability and wide application.

Description

A kind of straw sheet material and preparation method thereof

(1), technical field:

The present invention relates to a kind of sheet material, be specifically related to a kind of straw sheet material; The invention still further relates to the preparation method of this straw sheet material.

(2), background technology:

Along with Chinese society doctrine market economy system is built; The development of building materials market turns to the raising of quality by the expansion of quantity, and filling hybrid process to string becomes building and become one of field of enlivening the most in the industry of present building materials market with structural shapes.Reclaiming plant straw, timber leftover bits and pieces etc. is the utilization again to resource, can reduce consumption of wood effectively on the one hand, conserves forests; Wood-fibred and string source is sufficient on the other hand, and light weight is inexpensive, and is little to equipment attrition, the manufactured goods dimensionally stable, and electrical insulating property is good, can be processed into nontoxic stalk plate.But stalk plate in the production process is because the adhesion problem between admixture powder of straw and the Binder Materials; Its surperficial stalk can influence the moulding and the outward appearance of whole sheet material; The adding of stalk has changed the inner pore structure of goods in addition, has technical problems such as many bubbles, distortion, efflorescence.

(3), summary of the invention:

Technical problem to be solved by this invention provided a kind of light weight, heat insulation, sound insulation, wear-resisting, intensity is high, has the low straw sheet material of outstanding water proofing property and shrinkage factor simultaneously.

Another problem to be solved by this invention is to provide the preparation method of above-mentioned straw sheet material.

For solving the problems of the technologies described above, straw sheet material of the present invention, process by following raw materials according by weight:

Plant straw powder 57%, weight content >=85% magnesium oxide powder 16%, Baume concentration are magnesium chloride solution 25%, the maturing promotor 2% of 18～30 degree;

Wherein, described maturing promotor is made up of 92% flyash, 3% iron oxide yellow, 4% active silica, 1% ferrous sulfate by weight.

The preparation method of straw sheet material of the present invention comprises the steps:

(1) make its water content less than 20% agricultural crop straw oven dry earlier; Remove impurity, make its silt content less than 5%; Be ground into powder again, get plant straw powder;

(2) by weight, the flyash with 92%, 3% iron oxide yellow, 3% active silica and 1% ferrous sulfate mix and are crushed to 800 orders, maturing promotor;

(3) by 100: 95 weight ratio, magnesium chloride is put into container add clear water and dissolve, soak more than 30 hours, processing Baume concentration is 18～30 degree magnesium chloride solutions;

(4) by weight; After the magnesium oxide powder of the weight content with 16% >=85% and 25% Baume concentration are the magnesium chloride solution mixing and stirring of 18～30 degree; Join in 57% the plant straw powder, stir, add 2% maturing promotor again and stir;

(5) said mixture is put into mould and be pressed into sheet material.

The present invention is that the maturing promotor adding that utilization is made up of flyash, iron oxide yellow, active silica, ferrous sulfate is in the main material with the discarded in a large number plant straw powder in rural area; Produce straw sheet material; Make a silk purse out of a sow's ear; Prevent environmental pollution, practiced thrift the forest reserves, had good economic benefit and ecological environment benefit.Low production cost, aboundresources, the present invention since with string as the plate base, have light weight, sound insulation, heat-proof quality; Simultaneously, the adding of maturing promotor makes sheet material have protection against the tide, anti-wear performance.

Preparation method of the present invention is simple, and is easy to operate.The timber intensity of processing is high, durable in use, of many uses.

(4), the specific embodiment:

The raw material of straw sheet material of the present invention is:

Plant straw powder 570kg, weight content >=85% magnesium oxide powder 160kg, the magnesium chloride solution 250kg of weight concentration >=45%, maturing promotor 20kg;

Wherein, maturing promotor consists of flyash 18.4kg, iron oxide yellow 0.6kg, active silica 0.8kg, ferrous sulfate 0.2kg.

Preparation method at straw sheet material of the present invention comprises the steps:

(1) make its water content less than 20% the oven dry earlier of 620kg straw; Remove impurity, make its silt content less than 5%; Be ground into powder again, get plant straw powder 570kg;

(2) 184kg flyash, 6kg iron oxide yellow, 8kg active silica and 2kg ferrous sulfate are mixed and pulverize, get 800 order maturing promotor 180kg;

(3) by 100: 95 weight ratio, magnesium chloride is put into container add clear water and dissolve, soak more than 30 hours, processing Baume concentration is 18～30 degree magnesium chloride solutions;

(4) be to join in the said plant straw powder after the magnesium chloride solution 250kg mixing and stirring of 18～30 degree with weight content >=85% magnesium oxide powder 160kg and Baume concentration, stir, add the 20kg maturing promotor again and stir;

(5) said mixture is put into mould and suppress, can long 2.4m, 76 of the sheet materials of wide 1.2m, high 0.009m.

The present invention can select the straw that do not go mouldy, straw, rice husk, cornstalk, jowar stalk, sesame stalk, sunflower stalk, rape stalk, sawdust etc. for use, and oven dry earlier makes its water content less than 20%; Remove impurity, its silt content is less than 5%; Be ground into powder again, can be for use.Primary raw material is a string in the base-material, can play the reinforcement humidification, and the straw board hardness of processing is high, and is of many uses, has overcome the shortcoming that prior art exists, and sclerosis under the air conditions can not only be arranged in dry environment, also can be used for wet environment.

Maturing promotor is made up of 92% flyash by weight, 3% iron oxide yellow, 4% active silica, 1% ferrous sulfate.Contain a spot of calcium in the flyash, it is very favourable to the formation of gel, can gain in strength and durability; Iron oxide yellow has the raising tinctorial property, and active silica has the settleability of preventing, mainly as flocculant, flocculating effect is good for ferrous sulfate.Fineness 800 orders of composition; Relative density is between 3.2-4.7, and adding can form the strong crystallization gelatine compound of water-resistance effectively, and changes the knot contact of oxychloride magnesium double salt; Strengthen interting and adhesion between crystal, thereby improved the intensity and tax refusal property of material.

Magnesium chloride solution among the present invention is magnesium chloride to be put into bulk container add clear water and dissolve, and soaks more than 30 hours, measures with Baume hydrometer, can use when Baume concentration reaches 18～30 degree.Can overcome when air humidity is big, the magnesium oxychloride material product surface absorbs airborne moisture and produces surface moisture, and then overworks water column, even the globule occurs and join together and form the trickling phenomenon; Can overcome when the air humidity step-down simultaneously, product surface moisture evaporates accordingly, stays full of stains or spots white phenomenon.Effectively improve the quality of manufactured goods, the intensified waterproof moisture-proof characteristic strengthens and decorates and result of use.

The sheet material that the present invention produces not only all meets or exceeds pure wooden boards on various performance indications such as elastic modelling quantity, MOR, internal bond strength, surface bonding strength, thickness swelling rate, and it does not contain formaldehyde, and turns waste into wealth; Substitute timber; Can reduce deforestation, protect ecological environment, increase social benefit; Meet the requirement of building a conservation-minded society and developing a circular economy, have characteristics such as economy, environmental protection, durable, heat insulation, sound insulation.

Claims (2)

1. straw sheet material, by weight, process by following raw materials according:

Plant straw powder 57%, weight content >=85% magnesium oxide powder 16%, Baume concentration are magnesium chloride solution 25%, the maturing promotor 2% of 18～30 degree;

Wherein, described maturing promotor is made up of 92% flyash, 3% iron oxide yellow, 4% active silica, 1% ferrous sulfate by weight.

2. the preparation method of a straw sheet material comprises the steps:

(1) make its water content less than 20% agricultural crop straw oven dry earlier; Remove impurity, make its silt content less than 5%; Be ground into powder again, get plant straw powder;

(2) by weight, the flyash with 92%, 3% iron oxide yellow, 3% active silica and 1% ferrous sulfate mix and are crushed to 800 orders, maturing promotor;

(3) by 100: 95 weight ratio, magnesium chloride is put into container add clear water and dissolve, soak more than 30 hours, processing Baume concentration is 18～30 degree magnesium chloride solutions;

(4) by weight; After the magnesium oxide powder of the weight content with 16% >=85% and 25% Baume concentration are the magnesium chloride solution mixing and stirring of 18～30 degree; Join in 57% the plant straw powder, stir, add 2% maturing promotor again and stir;

(5) said mixture is put into mould and be pressed into sheet material.