Plant fiber heat preservation type gypsum plaster board and preparation method thereof

Abstract

The invention relates to the technical field of preparation of gypsum plaster boards, in particular to a plant fiber heat preservation type gypsum plaster board and a preparation method. Comprising surface protection paper and a gypsum board core, the gypsum board core is prepared from the following raw materials in parts by mass: 80 to 100 parts of gypsum clinker, 45 to 60 parts of deionized water, 0.01 to 0.03 part of foaming agent, 0.02 to 0.05 part of water reducing agent and 4.2 to 6.8 parts of modified plant fiber. The porous plant fibers are added into the gypsum plaster board, and after the porous plant fibers adsorb calcium ions, calcium carbonate whiskers can grow, so that a mechanical interlocking structure in a three-dimensional state is favorably formed, the strength of the gypsum plaster board is effectively improved, and meanwhile, the heat conductivity coefficient of the gypsum plaster board is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper faced gypsum board, and particularly relates to a plant fiber thermal insulation type paper faced gypsum board and a preparation method thereof. BACKGROUND

[0002] The paper faced gypsum board is a board material prepared by taking building gypsum as a main raw material as a board core and taking special board paper as a protective surface. The paper faced gypsum board has the characteristics of light weight, sound insulation, heat insulation, strong processing performance and simple construction method. The paper faced gypsum board can be divided into four types of ordinary, water-resistant, fire-resistant and moisture-proof. Due to the above-mentioned advantages, the paper faced gypsum board is more and more widely applied to various building fields.

[0003] In order to improve the performance of the paper faced gypsum board, fibers are often added in the paper faced gypsum board in the process of preparing the paper faced gypsum board. Commonly used fibers include carbon fibers, glass fibers and plant fibers. The addition of these fibers can greatly improve the strength of the paper faced gypsum board.

[0004] However, there are few technical solutions for improving the fibers in the prior art. Generally, the plant fibers are directly added into the gypsum board. The surface of the fibers is relatively smooth, and the mechanical interlocking effect of the fibers in the gypsum board is limited, and the strength of the paper faced gypsum board is also limited. Therefore, in view of the problems in the above background art, the technical personnel in the field propose a plant fiber thermal insulation type paper faced gypsum board and a preparation method thereof. SUMMARY

[0005] The present application aims to provide a plant fiber thermal insulation type paper faced gypsum board and a preparation method thereof to solve the problems in the above background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions. A plant fiber thermal insulation type paper faced gypsum board comprises a protective surface paper and a gypsum board core. The gypsum board core comprises the following components by mass fraction: gypsum clinker 80-100 parts, deionized water 45-60 parts, foaming agent 0.01-0.03 parts, water reducing agent 0.02-0.05 parts and modified plant fiber 4.2-6.8 parts. The preparation method of the modified plant fiber comprises the following steps: S101, after the plant fiber is cleaned by an organic solution, the plant fiber is heated to 50-70 DEG C in an alkali solution for 3-8 hours, and then cleaned by deionized water. S102, the plant fiber treated in step S101 is put into a 15-25wt% sodium chlorite solution, acetic acid is added dropwise to adjust the pH to 4-5, heated to 50-80℃ for 2-3h, then filtered, the filtered product is washed with deionized water and vacuum dried to constant weight to obtain a porous plant fiber; S103, the porous plant fiber obtained in step S102 is soaked in a 0.5-2wt% polyacrylic acid solution for 1-2h and vacuum dried to constant weight; S104, the porous plant fiber treated in step S103 is soaked in a 0.1-0.3mol / L calcium chloride solution for 0.5-1h, then filtered to obtain a filtered product; S105, the filtered product obtained in step S104 is put into 2-8wt% ammonia, carbon dioxide gas is introduced into the ammonia, and the reaction is continuously carried out at 70-120℃ for 1-2h, then filtered, and the filtered product is washed with deionized water and vacuum dried to constant weight to obtain a modified plant fiber.

[0007] Further, the plant fiber in step S101 is one of bamboo fiber and jute fiber; the organic solvent is a mixture of ethanol and acetone, and the mass ratio of ethanol to acetone is 1:1; the lye is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.5-2mol / L.

[0008] Further, the mass ratio between the lye and the plant fiber in step S101 is (10-20):1.

[0009] Further, the mass ratio between the sodium chlorite solution in step S102 and the plant fiber used in step S101 is (5-10):1.

[0010] Further, the mass ratio between the polyacrylic acid solution in step S103 and the plant fiber used in step S101 is (10-20):1.

[0011] Further, the mass ratio between the calcium chloride solution in step S104 and the plant fiber used in step S101 is (20-30):1.

[0012] Further, the mass ratio between the ammonia in step S105 and the plant fiber used in step S101 is (30-50):1; the speed of introducing carbon dioxide is 20-50ml / min.

[0013] A preparation method of a plant fiber heat preservation type paper-faced gypsum board, comprising the following steps: S1, a foaming agent, a water reducing agent and a modified plant fiber are added to deionized water in the order of mass parts, and stirred and mixed uniformly to obtain a mixture; S2, gypsum clinker is added to the mixture obtained in step S1 by mass parts, and stirring is uniformly mixed to obtain a gypsum slurry; S3, the gypsum slurry obtained in step S2 is cast on the facing paper, dried to constant weight at 90 DEG C to obtain a plant fiber insulation type paper faced gypsum board.

[0014] Further, the foaming agent used in step S1 is sodium dodecyl sulfate; the water reducing agent is polycarboxylic acid water reducing agent.

[0015] Compared with the prior art, the present application has the beneficial effects that: 1. In the present application, by adding porous plant fiber in the paper faced gypsum board, and the calcium carbonate whiskers can grow on the surface of the porous plant fiber, forming a three-dimensional cross structure, which is beneficial to mechanical interlocking, and can greatly improve the transverse breaking load and longitudinal breaking load of the paper faced gypsum board. 2. In the present application, the porous plant fiber added reduces the thermal conductivity of the paper faced gypsum board due to its porous structure, and the calcium carbonate whiskers can grow, so that the thermal insulation performance of the paper faced gypsum board is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The process flow chart for preparing the paper faced gypsum board in the present application; Fig. 2 The process flow chart for preparing the modified plant fiber in the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] Please refer to Figs. 1-2 The present application provides: Embodiment 1 A preparation method of a plant fiber insulation type paper faced gypsum board, comprising the following steps: S1, 0.02 parts of foaming agent, 0.04 parts of water reducing agent and 5.4 parts of modified plant fiber are sequentially added to 52 parts of deionized water, and stirring is uniformly mixed to obtain a mixture; S2, 90 parts of gypsum clinker is added to the mixture obtained in step S1, and stirring is uniformly mixed to obtain a gypsum slurry; S3, the gypsum slurry obtained in step S2 is cast on the facing paper, dried to constant weight at 90 DEG C to obtain a plant fiber insulation type paper faced gypsum board; The preparation method of the modified plant fiber comprises the following steps: S101, 10 parts of plant fiber are cleaned by an organic solution and then put into 140 parts of sodium hydroxide solution with a concentration of 1 mol / L and heated to 65°C for 5 hours, and then cleaned by deionized water, and the plant fiber is jute fiber; S102, the plant fiber treated in step S101 is put into 70 parts of sodium chlorite solution with a concentration of 20 wt%, acetic acid is added dropwise to adjust the pH to 4.5, heated to 70°C for 2.5 hours, filtered, and the filtered product is cleaned by deionized water and vacuum dried to constant weight to obtain a porous plant fiber; S103, the porous plant fiber obtained in step S102 is soaked in 120 parts of polyacrylic acid solution with a concentration of 1.5 wt% for 1.2 hours and vacuum dried to constant weight; S104, the porous plant fiber treated in step S103 is soaked in 220 parts of calcium chloride solution with a concentration of 0.2 mol / L for 0.8 hours, and the filtered product is obtained by filtration; S105, the filtered product obtained in step S104 is put into 400 parts of ammonia water with a concentration of 5 wt%, carbon dioxide gas is introduced into the ammonia water at a speed of 30 ml / min, and the continuous reaction is carried out at 100°C for 1.2 hours, then filtered, and the filtered product is cleaned by deionized water and vacuum dried to constant weight to obtain a modified plant fiber.

[0019] Example 2 A preparation method of a plant fiber thermal insulation type paper-faced gypsum board, comprising the following steps: S1, 0.01 parts of a foaming agent, 0.02 parts of a water reducing agent and 4.2 parts of a modified plant fiber are sequentially added to 45 parts of deionized water, and stirred and mixed uniformly to obtain a mixture; S2, 80 parts of gypsum clinker are added to the mixture obtained in step S1, and stirred and mixed uniformly to obtain a gypsum slurry; S3, the gypsum slurry obtained in step S2 is cast on a facing paper, and dried to constant weight at 90°C to obtain a plant fiber thermal insulation type paper-faced gypsum board; The preparation method of the modified plant fiber comprises the following steps: S101, 10 parts of plant fiber are cleaned by an organic solution and then put into 100 parts of sodium hydroxide solution with a concentration of 0.5 mol / L and heated to 50°C for 3 hours, and then cleaned by deionized water, and the plant fiber is jute fiber; S102, the plant fiber treated in step S101 is put into 50 parts of sodium chlorite solution with a concentration of 15wt%, acetic acid is added dropwise to adjust the pH to 4, heated to 50℃ for 2h, then filtered, the filtered product is washed with deionized water, and vacuum dried to constant weight to obtain a porous plant fiber; S103, the porous plant fiber obtained in step S102 is soaked in 100 parts of a polyacrylic acid solution with a concentration of 0.5wt% for 1h, and vacuum dried to constant weight; S104, the porous plant fiber treated in step S103 is soaked in 200 parts of a calcium chloride solution with a concentration of 0.1mol / L for 0.5h, and filtered to obtain a filtered product; S105, the filtered product obtained in step S104 is put into 300 parts of ammonia water with a concentration of 2wt%, carbon dioxide gas is introduced into the ammonia water at a rate of 20ml / min, and continuously reacted at 70℃ for 1h, then filtered, the filtered product is washed with deionized water, and vacuum dried to constant weight to obtain a modified plant fiber.

[0020] Example 3 A preparation method of a plant fiber thermal insulation type paper-faced gypsum board, comprising the following steps: S1, 0.03 parts of a foaming agent, 0.05 parts of a water reducing agent, and 6.8 parts of a modified plant fiber are sequentially added to 60 parts of deionized water, and stirred and mixed uniformly to obtain a mixture; S2, 100 parts of gypsum clinker are added to the mixture obtained in step S1, and stirred and mixed uniformly to obtain a gypsum slurry; S3, the gypsum slurry obtained in step S2 is cast on a facing paper, and dried at 90℃ to constant weight to obtain a plant fiber thermal insulation type paper-faced gypsum board; The preparation method of the modified plant fiber comprises the following steps: S101, 10 parts of plant fiber is cleaned by an organic solution, then put into 200 parts of a sodium hydroxide solution with a concentration of 2mol / L, heated to 70℃ for 8h, then cleaned with deionized water, and the plant fiber is jute fiber; S102, the plant fiber treated in step S101 is put into 100 parts of sodium chlorite solution with a concentration of 25wt%, acetic acid is added dropwise to adjust the pH to 5, heated to 80℃ for 3h, then filtered, the filtered product is cleaned with deionized water, and vacuum dried to constant weight to obtain a porous plant fiber; S103, the porous plant fiber obtained in step S102 is soaked in 200 parts of a polyacrylic acid solution with a concentration of 2wt% for 2h, and vacuum dried to constant weight; S104, the porous plant fiber treated in step S103 is soaked in 300 parts of a 0.3 mol / L calcium chloride solution for 1 h, and a filtered product is obtained by filtration; S105, the filtered product obtained in step S104 is placed in 500 parts of an 8 wt% ammonia solution, carbon dioxide gas is introduced into the ammonia solution at a rate of 50 ml / min, and after continuous reaction at 120°C for 2 h, the product is filtered, washed with deionized water, and vacuum dried to constant weight to obtain a modified plant fiber.

[0021] Example 4 A method for preparing a plant fiber thermal insulation type paper-faced gypsum board, comprising the following steps: S1, 0.02 parts of a foaming agent, 0.03 parts of a water reducing agent, and 5.8 parts of a modified plant fiber are sequentially added to 55 parts of deionized water, and stirred and mixed uniformly to obtain a mixture; S2, 95 parts of gypsum clinker are added to the mixture obtained in step S1, and stirred and mixed uniformly to obtain a gypsum slurry; S3, the gypsum slurry obtained in step S2 is cast on a facing paper, and dried at 90°C to constant weight to obtain a plant fiber thermal insulation type paper-faced gypsum board; The method for preparing the modified plant fiber comprises the following steps: S101, 10 parts of plant fiber are cleaned with an organic solution, then placed in 150 parts of a 1.5 mol / L sodium hydroxide solution, heated to 60°C for 4 h, then cleaned with deionized water, and the plant fiber is bamboo fiber; S102, the plant fiber treated in step S101 is placed in 80 parts of a 20 wt% sodium chlorite solution, acetic acid is added dropwise to adjust the pH to 4, heated to 60°C for 2.5 h, then filtered, and the filtered product is cleaned with deionized water and vacuum dried to constant weight to obtain a porous plant fiber; S103, the porous plant fiber obtained in step S102 is soaked in 160 parts of a 1.5 wt% polyacrylic acid solution for 1.6 h, and vacuum dried to constant weight; S104, the porous plant fiber treated in step S103 is soaked in 220 parts of a 0.2 mol / L calcium chloride solution for 0.8 h, and a filtered product is obtained by filtration; S105, the filtered product obtained in step S104 is placed in 440 parts of a 6 wt% ammonia solution, carbon dioxide gas is introduced into the ammonia solution at a rate of 40 ml / min, and after continuous reaction at 100°C for 2 h, the product is filtered, washed with deionized water, and vacuum dried to constant weight to obtain a modified plant fiber.

[0022] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that step S105 is completely omitted, while the remaining steps are exactly the same as in Example 1.

[0023] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that step S103 was completely omitted, while the remaining steps are exactly the same as in Example 1.

[0024] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that steps S101 and S102 are completely omitted, while the remaining steps are exactly the same as in Example 1.

[0025] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modified plant fiber added in step S1 is replaced with the same mass of ordinary plant fiber, i.e., unmodified jute fiber. The remaining steps are exactly the same as in Example 1.

[0026] In the above embodiments, the foaming agent used in step S1 is sodium dodecyl sulfate; the water-reducing agent is polycarboxylate superplasticizer; In the above embodiments, the organic solvent used in step S101 is a mixture of ethanol and acetone, and the mass ratio between ethanol and acetone is 1:1.

[0027] The paper-faced gypsum boards prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to performance tests. The tests included transverse breaking load (N), longitudinal breaking load (N), and thermal conductivity (W / (m·K)). The transverse breaking load (N) and longitudinal breaking load (N) were determined according to standard GB / T 9775-2008 "Paper-faced Gypsum Board", and the thermal conductivity (W / (m·K)) was determined according to standard GB / T10294-2008 "Determination of Steady-state Thermal Resistance and Related Properties of Thermal Insulation Materials - Protective Hot Plate Method". The test results are shown in Table 1 below. Table 1: Performance Test Table of Paper-faced Gypsum Boards Prepared in Examples 1-4 and Comparative Examples 1-4

[0028] Compared to Example 1, Comparative Example 1 showed reduced transverse and longitudinal fracture loads. In step S105, continuous carbon dioxide was introduced to form calcium carbonate whiskers on the surface of the plant fibers. The calcium carbonate whiskers, combined with the porous plant fibers, formed a three-dimensional reinforcing structure, which improved the mechanical locking ability and increased the strength of the gypsum board. Comparative Example 2 eliminated the treatment of plant fibers in polyacrylic acid solution. After the plant fibers were treated with polyacrylic acid solution, it was easier for the plant fibers to adsorb calcium ions, which was conducive to the formation of calcium carbonate whiskers. Therefore, the strength of the gypsum board in Example 1 was improved compared to Comparative Example 2. In Comparative Example 3, the alkali treatment and sodium chlorite treatment of the plant fibers were eliminated. This treatment allowed the plant fibers to form a porous structure, which not only provided more calcium ion binding sites, but also formed calcium carbonate whiskers. The resulting three-dimensional reinforcing structure was more conducive to improving the strength of the gypsum board. Furthermore, a comparison of Example 1 with Comparative Examples 1, 3, and 4 shows that the porous treatment of plant fibers and the growth of calcium carbonate whiskers through plant fibers in this invention can effectively reduce the thermal conductivity of paper-faced gypsum board and improve its heat preservation effect.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plant fiber thermal insulation paper-faced gypsum board, characterized in that, Including facing paper and gypsum board core; The gypsum board core comprises the following raw materials by weight: 80-100 parts gypsum clinker, 45-60 parts deionized water, 0.01-0.03 parts foaming agent, 0.02-0.05 parts water-reducing agent, and 4.2-6.8 parts modified plant fiber; The method for preparing the modified plant fiber includes the following steps: S101. After washing the plant fibers with an organic solution, they are placed in an alkaline solution and heated to 50-70℃ for 3-8 hours, and then washed clean with deionized water. S102. The plant fibers treated in step S101 are placed in a 15-25 wt% sodium chlorite solution, acetic acid is added dropwise to adjust the pH to 4-5, the mixture is heated to 50-80℃ and reacted for 2-3 hours, then filtered. The filtered product is washed with deionized water and vacuum dried to constant weight to obtain porous plant fibers. S103. The porous plant fibers obtained in step S102 are soaked in a 0.5-2wt% polyacrylic acid solution for 1-2 hours and then vacuum dried to constant weight. S104. The porous plant fiber treated in step S103 is soaked in a 0.1-0.3 mol / L calcium chloride solution for 0.5-1 h, and then filtered to obtain the filtered product. S105. The filtered product obtained in step S104 is placed into 2-8 wt% ammonia water, carbon dioxide gas is introduced into the ammonia water, and the reaction is carried out continuously at 70-120℃ for 1-2 hours. After filtration, the filtered product is washed with deionized water and vacuum dried to constant weight to obtain modified plant fiber.

2. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, The plant fiber in step S101 is either bamboo fiber or jute fiber; the organic solvent is a mixture of ethanol and acetone, with a mass ratio of 1:1 between ethanol and acetone; the alkaline solution is a sodium hydroxide solution with a concentration of 0.5-2 mol / L.

3. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, In step S101, the mass ratio between the alkali solution and the plant fiber is (10-20):

1.

4. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, In step S102, the mass ratio between the sodium chlorite solution and the plant fiber used in step S101 is (5-10):

1.

5. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, In step S103, the mass ratio between the polyacrylic acid solution and the plant fiber used in step S101 is (10-20):

1.

6. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, The mass ratio between the calcium chloride solution in step S104 and the plant fiber used in step S101 is (20-30):

1.

7. The plant fiber thermal insulation paper-faced gypsum board according to claim 1, characterized in that, The mass ratio between the ammonia water in step S105 and the plant fiber used in step S101 is (30-50):1; the rate of carbon dioxide introduction is 20-50 ml / min.

8. A method for preparing plant fiber thermal insulation paper-faced gypsum board according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Add the foaming agent, water-reducing agent and modified plant fiber to the deionized water in the order of mass parts, and stir to mix evenly to obtain a mixture; S2. Add the gypsum clinker to the mixture obtained in step S1 according to the mass fraction, and stir to mix evenly to obtain gypsum slurry; S3. Pour the gypsum slurry obtained in step S2 onto the facing paper and dry it at 90°C to constant weight to obtain plant fiber thermal insulation paper-faced gypsum board.

9. The method for preparing plant fiber thermal insulation paper-faced gypsum board as described in claim 8, characterized in that, The foaming agent used in step S1 is sodium dodecyl sulfate; the water-reducing agent is polycarboxylate superplasticizer.

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