Light straw brick as well as preparation method and application thereof

Abstract

The invention relates to a light straw brick as well as a preparation method and application thereof. The method comprises the following steps: 1) straw pretreatment; completely soaking the pretreated straws in a flame retardant solution, fishing out the straws after the straws are completely wetted, and drying the straws until no flame retardant solution drips from the straws within 5 minutes, so as to obtain wet straws; 2) mixing gypsum, sodium citrate and water to obtain an adhesive; the mass ratio of the gypsum to the sodium citrate to the water is 1: (0.001 to 0.005): (0.61 to 0.76); and 3) mixing the adhesive and the wet straws, pressing into bricks, and drying to obtain the light straw bricks. The gypsum can react and harden with water, so that the straw brick has excellent compressive strength, the hydration reaction of the gypsum and the water is faster than the hydration reaction of cement and the water, the production time can be shortened, and compared with the traditional cement straw brick, the produced light straw brick has lighter mass.

Description

Technical Field

[0001] The invention belongs to the technical field of straw brick preparation, and in particular relates to a lightweight straw brick and a preparation method and application thereof. Background Art

[0002] Straw bricks are a new type of building material that has emerged recently. The main raw material is straw fiber, which is made by extrusion and bundling. It has a wide range of applications in the construction field due to its low cost, easy material selection, pollution-free, heat-insulating, and light weight.

[0003] At present, the commonly used method for preparing straw bricks is to bundle and press discarded straw and other raw materials. This method is simple and quick, but the prepared straw bricks have low strength and require the use of adhesives to increase their strength. Therefore, some patents and literature disclose the use of cement as an adhesive to increase the strength of straw bricks. However, it is found during use that the use of cement as an adhesive will increase the weight of the straw bricks, resulting in increased labor costs and transportation costs during use, thereby limiting the application of straw bricks. Summary of the invention

[0004] The main purpose of the present invention is to provide a lightweight straw brick and a preparation method and application thereof. The technical problem to be solved is to provide a lightweight straw brick and a preparation method and application thereof, so that the straw bricks prepared thereby have excellent strength and flame retardant properties, low density and light weight, which can make the straw bricks easier to carry during use, thereby reducing the use cost of the straw bricks and expanding the application range of the straw bricks.

[0005] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to a method for preparing a lightweight straw brick proposed by the present invention, the method comprises:

[0006] 1) pretreatment of straw; completely immersing the pretreated straw in a flame retardant solution, taking out the straw after it is completely soaked, and drying it until no flame retardant solution drips from the straw within 5 minutes, thereby obtaining wet straw;

[0007] 2) mixing gypsum, sodium citrate and water to obtain an adhesive; the mass ratio of the gypsum, sodium citrate and water is 1:0.001-0.005:0.61-0.76;

[0008] 3) Mixing the adhesive with wet straw, pressing into bricks, and drying to obtain light straw bricks.

[0009] Preferably, in the aforementioned method for preparing lightweight straw bricks, in step 2), when preparing the adhesive, water is first added, then sodium citrate is added, and finally gypsum is added.

[0010] Preferably, in the aforementioned method for preparing lightweight straw bricks, in step 3), after mixing the adhesive and wet straw and before pressing them into bricks, the method also includes centrifuging the mixture of the adhesive and wet straw at a centrifugal rate of 590 to 610 r / min and a centrifugal time of 1 to 3 min.

[0011] Preferably, in the aforementioned method for preparing lightweight straw bricks, the straw pretreatment step comprises:

[0012] The straw is dried, cut to 4-10 cm, and finally sorted to remove weeds.

[0013] Preferably, in the aforementioned method for preparing lightweight straw bricks, the step of pressing into bricks comprises: placing a mixture of adhesive and wet straw into a mold, then pressing with a weight of 1 to 2 kg for 24 to 28 hours, and finally demolding.

[0014] Preferably, in the aforementioned method for preparing lightweight straw bricks, the flame retardant solution comprises a flame retardant and water; the mass ratio of the flame retardant to water is 0.18 to 0.25:1.

[0015] The purpose of the present invention and the solution to the technical problem are also achieved by adopting the following technical solutions. A light straw brick proposed in the present invention comprises:

[0016] Straw, the straw forming the main body of the lightweight straw brick;

[0017] Flame retardant and adhesive; the flame retardant and adhesive are coated on the surface of the straw and filled in the pores between the straws to bond the straws into a whole; the adhesive includes gypsum, sodium citrate and water; the mass ratio of gypsum to sodium citrate is 1:0.001-0.005; the water content of the lightweight straw brick is less than 15%.

[0018] Preferably, the aforementioned lightweight straw brick, wherein the density of the lightweight straw brick is 190-230 kg / m3; the lightweight straw brick is 300 mm in length, 150 mm in width, and 150 mm in height.

[0019] Preferably, the aforementioned lightweight straw bricks are prepared by the aforementioned method for preparing lightweight straw bricks.

[0020] The purpose of the present invention and the technical problem solved by the present invention are also achieved by adopting the following technical solutions: According to a partition wall proposed by the present invention, the partition wall is made of the above-mentioned light straw bricks.

[0021] By means of the above technical solution, the lightweight straw brick and its preparation method and application proposed by the present invention have at least the following advantages:

[0022] The lightweight straw bricks and their preparation method and application proposed in the present invention soak straw in a flame retardant liquid so that the straw and the straw bricks prepared from the straw have a certain flame retardant ability, thereby ensuring that the partition wall made of the lightweight straw bricks has a certain flame retardant performance and guarantees safety performance; after being soaked in the flame retardant, the straw is dried, and the moisture content in the straw is controlled by controlling the degree of dryness of the straw, so as to ensure the compressive strength and other mechanical properties of the lightweight straw bricks; in the technical solution of the present invention, an adhesive with gypsum and sodium citrate as main components is used to bond the straw into a whole, wherein the added gypsum can react with water and harden, so that the straw bricks can have excellent compressive strength, and the hydration reaction of gypsum and water is faster than the hydration reaction of cement and water, so the production time can be shortened, and the lightweight straw bricks produced have the advantages of lighter weight and lower cost compared with traditional cement straw bricks.

[0023] At the same time, the present invention uses gypsum and sodium citrate as admixtures for straw bricks, which are light in weight and have heat insulation and sound insulation. Mixing plant fiber with gypsum to form a plant fiber gypsum-based composite material can combine the advantages of both, retaining the low water absorption expansion rate and thermal expansion of gypsum, while the plant fiber can further enhance the mechanical properties and water resistance of gypsum.

[0024] Furthermore, the present invention uses rice straw as raw material. Since the water content of straw of different types and collected at different times may be different, in order to make the quality of lightweight straw bricks consistent and stable, the technical solution of the present invention preferably pre-treats the straw by drying before soaking it in flame retardant liquid. After drying, the moisture content of the straw can be uniformly controlled, so that the moisture in the lightweight straw brick can be controlled, and the soaking level can also be kept stable and consistent in the subsequent soaking in flame retardant liquid. On the one hand, it can reduce the chance of lightweight straw bricks becoming moldy and corrupt, extend the service life of lightweight straw bricks, and improve the durability of lightweight straw bricks. On the other hand, it can also make the flame retardant properties of straw bricks stable and controlled.

[0025] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a lightweight straw brick and its preparation method and application according to the present invention, its specific implementation method, structure, characteristics and effects in combination with the preferred embodiment. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0027] The present invention provides a method for preparing a lightweight straw brick, the method comprising:

[0028] 1) Pre-treating the straw; then completely immersing the pre-treated straw in a flame retardant solution, taking out the straw after it is completely soaked, and drying it until no flame retardant solution drips from the straw within 5 minutes, thereby obtaining wet straw.

[0029] The present invention completely immerses the pretreated straw in a flame retardant solution, maintains the immersion temperature for 12 to 15 hours, and then fishes out the straw, at which time the straw has been completely soaked in the flame retardant solution. The technical purpose of immersing the straw in the flame retardant solution is to allow the flame retardant to be in and between the straws, so that the straw and the straw bricks prepared from the straw have certain flame retardant properties.

[0030] Then, the straw soaked in flame retardant liquid is dehydrated until no droplets fall. The technical purpose of drying the straw is to reduce the water content introduced by the flame retardant liquid in the lightweight straw bricks and prevent the compressive strength of the lightweight straw bricks from decreasing. The dehydration can be done by natural draining or centrifugal dehydration in a centrifuge, as long as the water content in the straw can be effectively controlled; when centrifugal dehydration is used, the straw is placed in a centrifuge and centrifuged at a speed of 300-350r / min for 20-30s; the centrifugal rate cannot be too fast, as the flame retardant may be thrown out when the centrifugation is too fast, resulting in a decrease in the flame retardant performance of the straw; and when the centrifugal speed is too slow, the water may not be thrown out, resulting in an increase in the water content of the straw bricks, which in turn leads to a decrease in the compressive strength of the straw bricks.

[0031] 2) Mixing gypsum, sodium citrate and water to obtain an adhesive; the mass ratio of the gypsum, sodium citrate and water is 1:0.001-0.005:0.61-0.76.

[0032] Although the addition of gypsum can make the product have good performance, due to the fast coagulation speed of gypsum, if the gypsum has been coagulated and formed before pressing and molding, the product may not be able to be fixed, and the size and shape of the product cannot be controlled, resulting in poor product quality. Therefore, the present invention needs to strictly control the mass ratio of gypsum to sodium citrate to 1:0.001-0.005.

[0033] The present invention controls the quality of gypsum and water to be 1: (0.61-0.76). On the one hand, the amount of water cannot be too high, because when the amount of water is too high, the water content in the straw brick may increase, resulting in a decrease in the service life of the straw brick; and the amount of water cannot be too low, because when it is too low, the gypsum may not be completely hardened, resulting in a decrease in the compressive strength of the lightweight straw brick.

[0034] It should be noted that asphalt cannot be used in the adhesive of the present invention, because asphalt has extremely strong adhesion. If asphalt is added to the adhesive, the test block will stick to the mold when the test piece is demolded, resulting in stratification of the test piece after curing. Therefore, the present invention uses a mixture of gypsum, sodium citrate and water as a binder to avoid stratification of the test piece.

[0035] 3) Mixing the adhesive with wet straw, pressing into bricks, and drying to obtain light straw bricks.

[0036] For drying, the pressed bricks can be placed in a well-ventilated room for natural air drying or placed in a drying oven; if a drying oven is used for drying, the drying temperature needs to be adjusted to 60-70°C and the drying time needs to be 12-13 hours. The present invention does not specifically limit the specific drying method, as long as the moisture content of the straw bricks can be effectively controlled.

[0037] Preferably, in the aforementioned method for preparing the light straw brick, in step 2), when preparing the adhesive, water is first added, then sodium citrate is added, and finally gypsum is added. The technical purpose of such a setting is that adding water and sodium citrate first and then adding gypsum can reduce the generation of bubbles in the adhesive, thereby avoiding the formation of tiny cavities inside the straw brick after pressing, thereby avoiding or slowing down the decrease in the compressive strength of the straw brick.

[0038] Preferably, in the aforementioned method for preparing lightweight straw bricks, in step 3), after mixing the adhesive and wet straw and before pressing them into bricks, the method also includes centrifuging the mixture of the adhesive and wet straw at a centrifugal rate of 590 to 610 r / min and a centrifugal time of 1 to 3 min.

[0039] When the binder and the straw are mixed, the present invention preferably mixes the excess binder and the wet straw, and removes the excess binder after the mixing is completed. The technical purpose of this arrangement is to ensure that the straw can be fully coated and infiltrated by the binder to ensure the bonding performance between the straws and provide protection for the mechanical properties of the straw bricks. The present invention preferably uses a centrifuge to centrifuge the mixture of the binder and the wet straw, controls the centrifugal speed to be 590-610r / min, and the centrifugal time to be 1-3min. By controlling the centrifugal speed and the centrifugal time, the excess binder can be quickly thrown out, and the straw can be properly controlled to retain enough binder for straw bonding to ensure the mechanical properties of the straw bricks. The centrifugal rate cannot be too fast, because too fast centrifugation will cause too much binder to be thrown out, resulting in a decrease in the binder content in the lightweight straw bricks, and ultimately resulting in uneven distribution of the binder inside the straw bricks, resulting in a significant reduction in the local strength of the straw bricks; and too slow centrifugation may extend the preparation time and increase the preparation cost.

[0040] Preferably, in the aforementioned method for preparing lightweight straw bricks, the straw pretreatment step comprises:

[0041] The straw is dried, cut to 4-10 cm, and finally sorted to remove weeds.

[0042] The present invention cuts the straw to a length of 4 to 10 cm and then removes the weeds, which can prevent the weeds from affecting the strength of the lightweight straw bricks, thereby improving the compressive strength of the straw bricks. At the same time, the straw is dried to make the water content of straws of different types and collected at different times tend to be consistent, so that the quality of the lightweight straw bricks is consistent and stable. The technical purpose of cutting the straw to a length of 4 to 10 cm is, on the one hand, to facilitate the infiltration and penetration of the flame retardant liquid, and on the other hand, to facilitate the material collection and feeding during production. At the same time, the straw of this length can also give the straw bricks better mechanical properties. Preferably, the aforementioned method for preparing lightweight straw bricks, wherein the step of pressing into bricks comprises: putting a mixture of adhesive and wet straw into a mold, then using a weight of 1 to 2 kg to press for 24 to 28 hours, and finally demolding.

[0043] After mixing the adhesive and wet straw and removing excess adhesive, the mixture is placed in a mold and compacted with a weight of 1 to 2 kg. On the one hand, this is to enable the bubbles in the straw brick to be discharged, thereby improving the compressive strength of the straw brick. On the other hand, it is also to ensure that the straw brick has a neat appearance and accurate size. The pressing time is controlled to be 24 to 28 hours. Too long a pressing time will increase the preparation time and increase the preparation cost. If the pressing time is short, the bubbles cannot be completely discharged, resulting in a decrease in the compressive strength of the straw brick.

[0044] Preferably, in the aforementioned method for preparing lightweight straw bricks, the flame retardant solution comprises a flame retardant and water; the mass ratio of the flame retardant to water is 0.18 to 0.25:1.

[0045] The flame retardant used in the present invention is selected from phosphorus flame retardants, and the flame retardant solution is formed by mixing the flame retardant and water. The present invention preferably controls the mass ratio of the flame retardant and water to 0.18-0.25:1. If the water content is too high, the flame retardant performance of the lightweight straw brick will be reduced; if the water content is too low, the dry straw will not be able to absorb sufficient water. The straw in a water-deficient state may take away the water in the adhesive when mixed with the adhesive, thereby causing incomplete hardening of the gypsum, and further causing the performance of the straw brick to be reduced.

[0046] The gypsum used in the present invention is dihydrate gypsum. Compared with cement, dihydrate gypsum contains two crystal waters and has better flame retardancy. Therefore, with the combination of gypsum and flame retardant, the straw brick can have non-combustible properties, that is, if an open flame is used to ignite the straw brick, the probability of the straw brick being ignited is low, and if the straw brick is ignited, the flame on the straw brick will be extinguished immediately after the open flame is removed. Compared with straw bricks prepared with cement, cement straw bricks have poor flame retardancy. When cement straw bricks are ignited, the flame on the cement straw brick will not be extinguished immediately after the open flame is removed, and will continue to burn for a period of time before extinguishing.

[0047] The present invention also provides a lightweight straw brick, which comprises:

[0048] Straw, the straw forming the main body of the lightweight straw brick;

[0049] Flame retardant and adhesive; the flame retardant and adhesive are coated on the surface of the straw and filled in the pores between the straws to bond the straws into a whole; the adhesive includes gypsum, sodium citrate and water; the mass ratio of gypsum to sodium citrate is 1:0.4-1.4; the water content of the lightweight straw brick is less than 15%.

[0050] Preferably, the aforementioned lightweight straw brick, wherein the density of the lightweight straw brick is 190-230 kg / m3; the lightweight straw brick is 300 mm in length, 150 mm in width, and 150 mm in height.

[0051] Preferably, the aforementioned lightweight straw bricks are prepared by the aforementioned method for preparing lightweight straw bricks.

[0052] The present invention also provides a partition wall, which is made of the above-mentioned lightweight straw bricks.

[0053] The straw bricks prepared by the present invention are used to make partition walls, and the partition walls only need to play a partitioning effect and do not need to bear weight, so they do not need to have high compressive strength.

[0054] Compared with the existing straw bricks made with cement and asphalt as adhesives, although the straw bricks made with cement and asphalt as adhesives have lower compressive strength, under the same water content and the specifications of the straw bricks are 300 mm in length, 150 mm in width and 150 mm in height, each straw brick made with the present invention is at least 200g lighter than the straw bricks made with cement and asphalt as adhesives. When several thousand straw bricks are needed in actual production, the use of the straw bricks of the present invention can save at least 0.2 tons of transportation costs.

[0055] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0056] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0057] Example 1

[0058] A method for preparing a lightweight straw brick, the method comprising:

[0059] 1) Unpack the straw stacks from the farm, place them in a dry environment for drying and ventilation, then cut the straw into 5 cm lengths with a guillotine, and sort out the weeds;

[0060] 2) The cut straw is completely immersed in a phosphorus flame retardant solution for 14 hours; wherein the mass ratio of the flame retardant to water is 0.18:1; the straw is taken out after being immersed for a preset time, that is, completely soaked; then placed in a centrifuge for centrifugation at a centrifugal speed of 350 r / min for 20 seconds, so that no flame retardant solution drips within 5 minutes, and wet straw is obtained;

[0061] 3) mixing dihydrate gypsum, sodium citrate and water in a mass ratio of 1:0.002:0.76, and stirring into a uniform slurry by a machine to obtain an adhesive;

[0062] 4) Mix the wet straw with excess adhesive, and then place it in a centrifugal dehydrator to remove excess material. The removed material can be reused. Set the machine speed to 600r / min and the dehydration time to 2min;

[0063] 5) Brush a layer of oil on a wooden mold with a size of 300mm×150mm×150mm, then put the centrifuged wet straw and adhesive mixture into the prepared mold, first fill the bottom edge part, then fill the center part, and finally fill to the top edge of the mold, cover it with plastic film and compact it with bricks weighing 1.5kg;

[0064] 6) After compaction for 24 hours, remove the mold, put it into a drying oven, adjust the temperature to 60°C, and take it out after drying for 12 hours to obtain a light straw brick with a moisture content of 13%.

[0065] Embodiments 2 to 10

[0066] The same as in Example 1, the specific parameter differences and performance measurement data are shown in Table 1.

[0067] Comparative Example 1

[0068] The preparation method is the same as that of Example 1, except that the adhesive used in Example 1 includes: reference cement, asphalt modified rubber powder and water, and the mass ratio of the reference cement, asphalt modified rubber powder and water is 1:4:0.78.

[0069] The grass spindles prepared in each of the above embodiments and comparative examples were weighed and tested for flame retardancy; the grass spindles prepared in each of the above embodiments and comparative examples were subjected to standard curing for 28 days, and their compressive strength and elastic modulus were tested respectively. The results are shown in Table 1.

[0070] Table 1

[0071]

[0072] It can be seen from the test data of the above embodiments that with the change of the mass ratio of water to gypsum when making straw bricks, the compressive strength of the straw bricks presents a parabolic trend of first increasing and then decreasing, such as in Examples 1 to 6. Especially when the mass ratio of water to gypsum is 0.64 to 0.67:1, the compressive strength of the straw bricks is particularly high, which can reach above 0.9 MPa.

[0073] It can be seen from the test data of the above embodiments that with the change of the mass ratio of water to gypsum when making straw bricks, the elastic modulus of the straw bricks presents a parabolic trend of first increasing and then decreasing, such as in Examples 1 to 6. Especially when the mass ratio of water to gypsum is 0.67 to 0.73:1, the elastic modulus of the straw bricks prepared is particularly high, which can reach more than 6MPa.

[0074] It can be seen from the test data of the above embodiments that when the mass ratio of water to gypsum is 0.67:1, the compressive strength and elastic modulus of the prepared grass turn reach a relatively high level at the same time, as shown in Example 4.

[0075] Although the straw bricks in the comparative example are 7 times lighter than ordinary clay bricks (the weight is only one-seventh of ordinary clay bricks of the same specifications and sizes); however, compared with the embodiments of the present invention, the moisture content of the straw bricks in Example 1 is 13%, and its mass is 1310g; while the moisture content of the straw bricks in the comparative example is 13%, and its mass is 1640g; after comparison, it can be found that in the embodiments and the comparative example, when the straw bricks have the same moisture content and the same specifications, the straw bricks in the embodiments are 20 to 30 percent lighter than the straw bricks in the comparative example. Therefore, in practical applications, the use of the straw bricks of the present invention can further reduce labor costs and transportation costs.

[0076] Furthermore, although the comparative example has a heavier dead weight and uses cement material as a binder, its 28-day compressive strength is more than ten times worse than that of the embodiment of the present invention, reaching only 0.07 MPa, and its 28-day elastic modulus is three or four times worse than that of the embodiment of the present invention, reaching only 1.82 MPa; while the technical solution of the present invention has much better compressive strength, elastic modulus and flame retardant properties under the condition of lighter dead weight, and has outstanding technical effects.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a lightweight straw brick, characterized in that: The method comprises: 1) pretreatment of straw; completely immersing the pretreated straw in a flame retardant solution, taking out the straw after it is completely soaked, and drying it until no flame retardant solution drips from the straw within 5 minutes, thereby obtaining wet straw; 2) mixing gypsum, sodium citrate and water to obtain an adhesive; the mass ratio of the gypsum, sodium citrate and water is 1:0.001-0.005:0.61-0.76; 3) Mixing the adhesive with wet straw, pressing into bricks, and drying to obtain light straw bricks.

2. The method for preparing the light straw brick according to claim 1, characterized in that: In step 2), when preparing the adhesive, water is added first, then sodium citrate is added, and finally gypsum is added.

3. The method for preparing the light straw brick according to claim 1, characterized in that: In step 3), after the adhesive and wet straw are mixed and before they are pressed into bricks, the mixture of the adhesive and wet straw is centrifuged at a centrifugal rate of 590 to 610 r / min for a centrifugal time of 1 to 3 min.

4. The method for preparing the light straw brick according to claim 1, characterized in that: The steps of straw pretreatment include: The straw is dried, cut to 4-10 cm, and finally sorted to remove weeds.

5. The method for preparing the light straw brick according to claim 1, characterized in that: The step of pressing into bricks comprises: putting a mixture of adhesive and wet straw into a mold, then pressing with a weight of 1 to 2 kg for 24 to 28 hours, and finally demolding.

6. The method for preparing the light straw brick according to claim 1, characterized in that: The flame retardant solution comprises a flame retardant and water; the mass ratio of the flame retardant to water is 0.18-0.25:

1.

7. A light straw brick, characterized in that: It includes: Straw, the straw forming the main body of the lightweight straw brick; Flame retardant and adhesive; the flame retardant and adhesive are coated on the surface of the straw and filled in the pores between the straws to bond the straws into a whole; the adhesive includes gypsum, sodium citrate and water; the mass ratio of gypsum to sodium citrate is 1:0.001-0.005; the moisture content of the lightweight straw brick is less than 15%.

8. The lightweight straw brick according to claim 7, characterized in that: The density of the lightweight straw brick is 190-230 kg / m3; the length of the lightweight straw brick is 300 mm, the width is 150 mm, and the height is 150 mm.

9. The lightweight straw brick according to claim 7, characterized in that: The light straw brick is prepared by the method for preparing the light straw brick according to any one of claims 1 to 6.

10. A partition wall, characterized in that: The partition wall is made of the lightweight straw bricks described in any one of claims 7 to 9.

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