Preparation method of rice straw brick and its product and application

Abstract

The invention relates to a rice straw brick preparation method as well as rice straw bricks and application of the rice straw bricks. According to the invention, rice straw is pre-treated through a NaOH solution with the mass fraction of 2%-5%, the rice straw brick preparation method is optimized from the five aspects of NaOH solution soaking concentration, temperature, soaking time, forming pressure and natural curing time, and optimal preparation conditions and method are established. The preparation method is simple and convenient, the sizes of formed products are changed slightly, and the formed products are low in density and excellent in anticorrosion effect and thermal performance. Through the preparation method, the rice straw is prepared into the straw bricks, and the straw bricks are used as building wall materials, so that improvement on thermal insulation performance of a building is facilitated, application and popularization of the straw bricks for building thermal insulation are facilitated, and the straw bricks are particularly suitable for thermal insulation of agricultural buildings.

Description

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing rice straw bricks and its products and applications. Background technique

[0002] With the continuous improvement of building energy-saving and environmental protection requirements, countries all over the world have paid full attention to building energy-saving technology. In the past 30 years, countries have done a lot of work in building design and construction, development and application of new building insulation materials, formulation and implementation of building energy-saving regulations, certification and management of building energy-saving products, not only saving a lot of energy , and achieved considerable economic benefits, while improving the environment and reducing the damage to the atmospheric ozone layer.

[0003] According to the latest statistics, there are 700 million tons of straw produced by crops in China every year...

Examples

preparation example Construction

[0027] A novel preparation method of rice straw bricks, the steps are as follows:

[0028] (1) cutting the straw stalks;

[0029] (2) Submerge the cut rice straw in NaOH solution, stir evenly and soak for a period of time;

[0030] (3) filter the soaked rice straw and wash with water for 3-4 times;

[0031] (4) dehydrating and cold-pressing the filtered rice straw;

[0032] (5) Carry out natural maintenance on the bricks obtained after demoulding to obtain straw bricks.

Embodiment 1

[0033] The optimization of the preparation method condition of embodiment 1 rice straw brick

[0034] The present invention optimizes the preparation method of rice straw from the five aspects of NaOH solution immersion concentration, temperature, immersion time, forming pressure, and natural curing time, establishes the best preparation conditions and methods, and measures its physical properties and thermal conductivity The coefficients confirm the reliability of the method.

[0035] 1. Determination of soaking concentration of NaOH solution

[0036] In order to explore the influence of different concentrations of sodium hydroxide solution on the physical properties of straw bricks, the mass fraction of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% sodium hydroxide solution was used to treat the straw bricks. After soaking and softening treatment, 8 groups of test pieces were pressed respectively, with 3 pieces in each group. The size is unified as: 160×40×40mm, which will be marked sepa...

Embodiment 2

[0049] Example 2 Experimental Verification of the Preparation Method of Rice Straw Bricks

[0050] 1. Research on thermal conductivity of straw bricks

technical field

[0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing rice straw bricks and its products and applications. Background technique

[0002] With the continuous improvement of building energy-saving and environmental protection requirements, countries all over the world have paid full attention to building energy-saving technology. In the past 30 years, countries have done a lot of work in building design and construction, development and application of new building insulation materials, formulation and implementation of building energy-saving regulations, certification and management of building energy-saving products, not only saving a lot of energy , and achieved considerable economic benefits, while improving the environment and reducing the damage to the atmospheric ozone layer.

[0003] According to the latest statistics, there are 700 million tons of straw produced by crops in China every year...

Examples

preparation example Construction

[0027] A novel preparation method of rice straw bricks, the steps are as follows:

[0028] (1) cutting the straw stalks;

[0029] (2) Submerge the cut rice straw in NaOH solution, stir evenly and soak for a period of time;

[0030] (3) filter the soaked rice straw and wash with water for 3-4 times;

[0031] (4) dehydrating and cold-pressing the filtered rice straw;

[0032] (5) Carry out natural maintenance on the bricks obtained after demoulding to obtain straw bricks.

Embodiment 1

[0033] The optimization of the preparation method condition of embodiment 1 rice straw brick

[0034] The present invention optimizes the preparation method of rice straw from the five aspects of NaOH solution immersion concentration, temperature, immersion time, forming pressure, and natural curing time, establishes the best preparation conditions and methods, and measures its physical properties and thermal conductivity The coefficients confirm the reliability of the method.

[0035] 1. Determination of soaking concentration of NaOH solution

[0036] In order to explore the influence of different concentrations of sodium hydroxide solution on the physical properties of straw bricks, the mass fraction of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% sodium hydroxide solution was used to treat the straw bricks. After soaking and softening treatment, 8 groups of test pieces were pressed respectively, with 3 pieces in each group. The size is unified as: 160×40×40mm, which will be marked sepa...

Embodiment 2

[0049] Example 2 Experimental Verification of the Preparation Method of Rice Straw Bricks

[0050] 1. Research on thermal conductivity of straw bricks

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