Preparation method of corn straw thermal insulation concrete masonry material

Abstract

The application relates to a preparation method of a corn straw thermal insulation concrete masonry material, which mainly utilizes the renewable resource of corn straw to produce a masonry thermal insulation material. The material can greatly improve the comprehensive utilization rate of corn straw, reduce the burden of the renewable resource of corn straw on the environment, reduce the carbon dioxide emission during the operation of buildings through the thermal insulation performance of corn straw, reduce the energy consumption of people in all seasons, improve the living comfort of people due to the light structure and good sound insulation performance of corn straw, and is a rare green building thermal insulation concrete masonry material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of construction engineering, and is a preparation method of corn straw thermal insulation concrete block material with high specific strength, thermal insulation performance, heat insulation performance, anxiety performance, sound insulation performance and high comfort. TECHNICAL BACKGROUND

[0002] Corn straw is a natural renewable natural resource, and is an excellent thermal insulation material, heat insulation material and sound insulation material. Such excellent thermal insulation and heat insulation renewable resources cannot be widely used in modern building materials, mainly because untreated corn straw cannot be effectively combined with portland cement. Untreated corn straw contains a large amount of cellulose sugar, which hinders the hydration reaction of portland cement. At the same time, corn straw has no compressive strength, so excessive amount can even cause portland cement to never set. The present application uses a harmless treatment method to treat agricultural and forestry waste corn straw. The treated corn straw particles can be effectively combined with portland cement to produce mechanical strength and prepare green and environmentally friendly recyclable corn straw thermal insulation concrete block material. SUMMARY

[0003] The present application uses a method based on physical and chemical principles to treat previously air-dried corn straw particles. The treated corn straw has a certain bearing capacity and can simulate concrete stones to be used as filling aggregate for concrete. This method has no secondary discharge during the treatment process, and the entire processing process is green and environmentally friendly. Moreover, the prepared wall material can be crushed again after many years and used as filling aggregate in corn straw concrete blocks. This method can greatly improve the comprehensive utilization of corn straw, solve environmental and social problems caused by the production process of corn straw, increase farmers' income, strengthen rural productivity, and reduce the dependence on natural resources of traditional building materials.

[0004] First, the harvested corn straw is air-dried. The harvested corn straw is air-dried. During the treatment process, cattle and sheep and other livestock are used to remove the leaves of the air-dried corn straw to avoid excessive corn straw leaves affecting the average density of the corn straw particles. 40-55 parts of the air-dried corn straw are crushed using a straw crusher. The fineness modulus of the crushed corn straw is controlled between 6-15.

[0005] Because the corn stalk contains a large amount of cellulose sugar, in order to avoid the influence of cellulose sugar on the hydration reaction of Portland cement, the corn stalk is soaked in a 5-10 part ice acetic acid solution for 3-4 hours, and the soaking process is carried out in a negative pressure instrument, and the negative pressure value is 0.2 MPa, so that the esterification reaction between the ice acetic acid and the cellulose sugar is deep, and the cellulose sugar is effectively decomposed, and the modified corn stalk is obtained, and the fineness mode of the modified corn stalk is controlled between 6-15 particles, which is left for standby.

[0006] The calcium pyruvate 1-2 parts is subjected to graft copolymerization reaction with xylene 1-2 parts to obtain a corn stalk modification treatment liquid stock solution for standby.

[0007] The water emulsified tetrachloro-m-phenylenedinitrile 0.5-2 parts and dimethylformamide 3-6 parts are dissolved and diluted with 80-degree hot water, and polyurethane flame retardant 5-9 parts is added to the solution after dissolution to prepare a corn stalk modification mixed liquid.

[0008] The 5-7 parts of nano silicon dioxide solution is subjected to graft copolymerization reaction, and the obtained corn stalk treatment liquid is mixed, and the treated corn stalk is subjected to surface spraying treatment to obtain the preliminary corn stalk surface treated corn stalk particles.

[0009] The diphenyl propane type epoxy resin is pretreated with a high-pressure centrifugal separation pot, and 100-120 parts of tap water for removing chlorine ions is added during the treatment process to prepare a corn stalk toughening treatment liquid base solution one.

[0010] The polyamide resin 5-10 parts is used as a chemical reaction catalyst to prepare a corn stalk toughening treatment liquid base solution three.

[0011] The polyvinyl butyral 20-30 parts and ethylene carbonate 3-6 parts are subjected to graft copolymerization reaction, and the synthesized compound after reaction is diluted with 100-120 parts of chlorine-removed tap water, and the diluted solution is dissolved with a high-speed stirrer to prepare a corn stalk toughening treatment liquid.

[0012] The treated corn stalk aggregate is irradiated under a 120℃ ultraviolet lamp for 3-4 minutes on a vibrating crawler machine to prepare a corn stalk filling aggregate.

[0013] Hydroxypropyl methyl cellulose 2-6 parts and 4 beta hydroxypropyl tapioca starch 7-10 parts are dry mixed and mixed for 4 minutes. The mixed material is added to 100-125 parts of tap water without chlorine in a certain proportion, stirred at high speed for 10 minutes, and fully dissolved and dispersed in water. The aggregate surface is fully dipped in the solution. 20-40 parts of secondary fly ash and 100-150 parts of 32.5R ordinary portland cement are simultaneously mixed with the treated corn stalks to make the surface of the corn stalks fully coated with fly ash and portland cement. After 28 days of curing, the final corn stalk portland cement particles are prepared.

[0014] Hydroxypropyl methyl cellulose 5-6 parts and tap water 100-120 parts are mixed. The mixed solution is allowed to stand for more than 20 minutes. Then 32.5R ordinary portland cement 200-240 parts is mixed. The cement paste is mixed with the prepared particles. Glass fiber 5-6 parts is added during the mixing process. After stirring, the desired form of masonry mold is added.

[0015] Curing is required at high temperature 100-120°C high temperature steam for 8-6 hours to ensure the hydration strength of the corn stalk insulation concrete block. Specific implementation method

[0016] Embodiment

[0017] 40-55 parts of air-dried corn stalks are crushed with a straw crusher. The fineness modulus of the crushed corn stalks is controlled between 6-15.

[0018] The corn stalks are soaked in a 5-10 part ice acetic acid solution for 3-4 hours. The soaking process is carried out in a negative pressure instrument with a negative pressure value of 0.2 MPa. The modified corn stalks with a fineness mode controlled between 6-15 are obtained and stored for use.

[0019] Calcium pyruvate 1-2 parts and dimethylbenzene 1-2 parts are subjected to graft copolymerization to obtain a corn stalk modification solution stock solution for standby.

[0020] Water-emulsified tetrachloro-m-phenylenedinitrile 0.5-2 parts and dimethylformamide 3-6 parts are dissolved and diluted with 80-degree hot water. Polyurethane flame retardant 5-9 parts is added to the dissolved solution to prepare a corn stalk modification mixed solution.

[0021] 5-7 parts of nano-silicon dioxide solution are subjected to graft copolymerization to prepare a corn stalk treatment solution mixture. The mixture is sprayed on the surface of the previously treated corn stalks to obtain the preliminary corn stalk surface treated corn stalk particles.

[0022] In preparation of corn straw toughening treatment liquid, diphenyl propane type epoxy resin is pretreated by high pressure centrifugal separation pot, and 100-120 parts of tap water without chlorine ions is added during the treatment process to fuse and prepare base liquid one of corn straw toughening treatment liquid.

[0023] Then, 1-3 parts of diamino stilbene disulfonic acid is fused with the toughening treatment liquid to prepare base liquid two of corn straw toughening treatment liquid.

[0024] Then, 5-10 parts of polyamide resin is reacted with the toughening treatment liquid two to prepare base liquid three of corn straw toughening treatment liquid.

[0025] Then, 20-30 parts of polyvinyl butyral is grafted with 3-6 parts of ethylene carbonate to perform copolymerization reaction, and the reaction product is diluted with 100-120 parts of tap water without chlorine ions, and the diluted solution is dissolved with the corn straw toughening treatment liquid by using a high-speed stirrer to prepare the corn straw toughening treatment liquid.

[0026] Then, the prepared corn straw toughening treatment liquid is mixed with 40-55 parts of corn straw to perform treatment, and the treated corn straw aggregate is irradiated under a 120℃ ultraviolet lamp for 3-4 minutes on a vibrating crawler to prepare corn straw filled aggregate.

[0027] 2-6 parts of hydroxypropyl methyl cellulose is dry mixed with 7-10 parts of 4β hydroxypropyl tapioca starch for 4 minutes, and the mixed material is added into 100-125 parts of tap water without chlorine ions in a certain proportion, and is stirred at high speed for 10 minutes to fully dissolve and disperse the mixed material in water, so that the aggregate surface is fully dipped with the dissolved solution, and then 20-40 parts of secondary fly ash and 100-150 parts of 32.5R ordinary portland cement are mixed with the treated corn straw at the same time to fully wrap the corn straw surface with fly ash and portland cement, and the final portland cement particles of corn straw are prepared after 28 days of curing.

[0028] 5-6 parts of HPMC is mixed with 100-120 parts of tap water, and the mixed solution is left still for more than 20 minutes, and then 200-240 parts of 32.5R ordinary portland cement is mixed with the mixed solution, and the cement paste after mixing is mixed with the prepared particles, and 5-6 parts of glass fiber is added during the mixing process, and then the particles are added into a desired form of masonry mold after fully stirring.

[0029] The masonry block of corn straw insulation concrete needs to be cured under high temperature steam at 100℃-120℃ for 8-6 hours to ensure the hydration strength of the corn straw insulation concrete block.

Claims

1. A method of making corn stover insulating concrete masonry material, characterized by According to the quality parts, including the following raw materials and steps: the corn stalks after harvesting are dried in situ, 40-55 parts of the dried corn stalks are crushed by a rice straw crusher, and the fineness modulus of the crushed corn stalks is controlled between 6-15; 5-10 parts of glacial acetic acid solution is used to soak the corn stalks for 3-4 hours, and the soaking process needs to be carried out in a negative pressure instrument with a negative pressure value of 0.2 MPa, so that the glacial acetic acid and the cellulose sugar produce esterification reaction, effectively decomposing the fiber sugar, and obtaining modified corn stalks; The modified corn stalks are treated by surface spraying with the modified corn stalks treatment solution to obtain corn stalk particles; the corn stalk particles are mixed with the corn stalk toughening treatment solution to obtain corn stalk aggregates, and the corn stalk aggregates are irradiated under a 120℃ ultraviolet lamp for 3-4 minutes on a vibrating crawler to prepare corn stalk filling aggregates; the corn stalk filling aggregates are mixed with the corn stalk filling aggregate anti-floating solution to make the surface of the aggregates fully dip in the anti-floating solution, and then 20-40 parts of secondary fly ash and 100-150 parts of 32.5R ordinary portland cement are mixed with the treated corn stalks to make the surface of the corn stalks fully wrapped in fly ash and portland cement, and corn stalk portland cement particles are prepared after 28 days of curing; 5-6 parts of HPMC are mixed with 100-120 parts of tap water, the mixed solution is static for more than 20 minutes, and then 200-240 parts of 32.5R ordinary portland cement is mixed, and the mixed cement paste is mixed with the corn stalk portland cement particles, and 5-6 parts of glass fiber is added during the mixing process, and after fully stirring, it is added into the required form of masonry mold; curing under high temperature 100℃-120℃ high temperature steam for 8-6 hours to ensure the hydration strength of the corn stalk insulation concrete block, and obtain the corn stalk insulation concrete masonry material.

2. The method for preparing a corn stalk thermal insulation concrete masonry material according to claim 1, characterized in that, The preparation method of the modified corn stalk treatment solution is as follows: 1-2 parts of calcium acetate and 1-2 parts of dimethylbenzene are subjected to graft copolymerization reaction to obtain a corn stalk modification treatment solution stock solution; 0.5-2 parts of water-emulsified tetrachloro-m-phenylenedinitrile and 3-6 parts of dimethylformamide are dissolved and diluted with 80 degree hot water, 5-9 parts of polyurethane flame retardant is added to the dissolved solution to prepare a corn stalk modification mixed solution; 5-7 parts of nano silicon dioxide solution is subjected to graft copolymerization reaction with the corn stalk modification treatment solution stock solution and the corn stalk modification mixed solution to prepare the modified corn stalk treatment solution.

3. The method for preparing a corn stalk thermal insulation concrete masonry material according to claim 1, characterized in that, The preparation method of the modified corn straw toughening treatment solution is as follows: the diphenol-based epoxy resin is pretreated by a high-pressure centrifugal separation pot, and during the treatment process, 100-120 parts of tap water from which chlorine ions are removed are added for fusion, 1-3 parts of diaminodiphenylstyrene disulfonic acid are added, and 5-10 parts of polyamide resin are added as a chemical reaction catalyst to prepare a base solution of the corn straw toughening treatment solution; 20-30 parts of polyvinyl butyral and 3-6 parts of ethylene carbonate are subjected to graft copolymerization reaction, the resultant is diluted with 100-120 parts of chlorine-removed tap water, and the diluted solution is dissolved with the base solution of the corn straw toughening treatment solution by using a high-speed stirrer to prepare the corn straw toughening treatment solution.

4. The method for preparing a corn stalk thermal insulation concrete masonry material according to claim 1, characterized in that, The preparation method of the corn straw filled aggregate anti-floating solution is as follows: 2-6 parts of hydroxypropyl methyl cellulose and 7-10 parts of 4beta hydroxypropyl tapioca starch are dry mixed, the mixing time is 4 minutes, and the mixed material is added into 100-125 parts of chlorine-removed tap water in a certain proportion, and is subjected to high-speed stirring for 10 minutes to allow the mixed material to be fully dissolved and dispersed in the water.