TWI788874B - Eco-friendly fiber board and the manufacturing method thereof - Google Patents

Abstract

Eco-friendly fiber board and the manufacturing method thereof includes a material preparation step, a stirring step, a mixing step, a pressing step, and a maintaining step. The material preparation step is to prepare a stainless steel reducing slag material which occupies 35-60 wt%, a cement material which occupies 10-35 wt%, a fly ash material of power plants which occupies 15-35 wt%, and a paper pulp material which occupies 5-20 wt%. The stirring step is to stir the paper pulp material with water to obtain a liquid paper pulp material. The mixing step is to mix the liquid paper pulp material, the stainless steel reducing slag material, the cement material, and the fly ash material into a slurry material. The pressing step is to drain additional water of the slurry material by extruding after pouring the slurry material into a mold to obtain a primary board. The maintaining step is to maintain by steam with high temperature and high pressure to complete the manufacturing method. Hence, the stainless steel reducing slag material and the fly ash material that contain a high proportion of industrial by-products can be made into an eco-friendly fiber board which has better mechanical performance and stable property.

Description

Environment-friendly fiber board and manufacturing method thereof

The invention relates to a board and a manufacturing method, in particular to an environmentally friendly fiber board and a manufacturing method thereof.

General fiberboard is mainly made of cement with a weight percentage of about 30 to 50%, silicon material with a content of about 30 to 35%, and asbestos fibers with a content of about 10 to 15%. However, conventional fiberboards contain high content of For cement, the raw materials used in the cement production process belong to natural limited resources, and a large amount of carbon dioxide produced in the production process is very environmentally unfriendly. In addition, asbestos is also a naturally occurring mineral product. Resources are gradually depleted, and asbestos is carcinogenic. Therefore, it is necessary to develop materials similar to asbestos for replacement and reduce the amount of cement used, so as to meet environmental protection and cost-effective products.

In addition, pulp fibers made of materials such as wood and bamboo have been used in the follow-up, which have hydrophilic properties and good dispersion in cement paste, and have been used as a substitute for asbestos. The finished board usually contains 30%-50% cement, 10-20% silicon material, and about 4-8% polyvinyl alcohol or modified polypropylene fiber synthetic fiber or wood pulp, etc. However, the panels made of the aforementioned materials still use a high content of cement, so how to develop another panel that not only reduces the amount of cement used, but also has good mechanical properties and stability, is the focus of the present invention. The goal to pursue.

Therefore, the purpose of the present invention is to provide an environmentally friendly fiber board and its manufacturing method, which can produce an environmentally friendly fiber board with good mechanical properties and stable properties through high content of industrial by-products.

Therefore, the present invention provides an environmentally friendly fiber board and its manufacturing method, which includes a material preparation step, a stirring step, a mixing step, an extrusion step and a maintenance step; wherein, the material preparation step is equipped with a 35-60% by weight stainless steel reduction ballast, A 10-35 weight percent cement, a 15-35 weight percent power plant fly ash, and a 5-20 weight percent pulp; in addition, in the stirring step, the pulp fiber and water are first stirred into a liquid pulp fiber In the mixing step, the liquid pulp fiber, stainless steel reduction ballast, cement and power plant fly ash are mixed into a slurry, and the slurry is poured into the mold, and the excess water is extruded to form a raw material of the board , and then it can be completed after this curing step is cured by high-temperature and high-pressure steam; therefore, the present invention mainly uses a high proportion of industrial by-products of stainless steel reduction ballast and power plant fly ash, and then mixes it with a small proportion of cement and paper pulp. An environmentally friendly fiber board with good mechanics and stable properties can be produced.

The aforementioned and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of preferred embodiments with reference to the drawings.

Referring to Fig. 1, a preferred embodiment of the environmental protection fiberboard of the present invention and its manufacturing method, the environmental protection fiberboard mainly comprises a 35-60 weight percent stainless steel reduction ballast, a 10-35 weight percent cement, and a 15-15 weight percent 35% by weight of power plant fly ash, and 5-15% by weight of paper pulp, wherein the particle size of the stainless steel reduction ballast needs to pass through a #40mesh sieve (particle size 0.042mm).

Continue to refer to Figure 1, the manufacturing method of the environmentally friendly fiberboard includes a material preparation step, a stirring step, a mixing step, an extrusion step and a curing step; wherein, the material preparation step is equipped with stainless steel reduction slag, cement, power plant fly ash and paper pulp, and the content of the aforementioned stainless steel reduction slag is 35-60 weight percent, the power plant fly ash content is 15-35 weight percent, the cement content is 10-35 weight percent, and the paper pulp content is 5-20 weight percent; , the stirring step is to homogeneously stir the pulp into a liquid pulp after adding water, and the ratio of the aforementioned dry pulp to water is in the range of 1:10~40; as for the mixing step, the liquid pulp , stainless steel reduction ballast, cement and power plant fly ash are mixed into a slurry according to the ratio in the material preparation step.

Continuing from the above, the extrusion step is equipped with a mold, which pours the slurry into the mold, and uses extrusion to discharge excess water, and then performs demoulding to form a sheet raw material, and at the same time discharges excess water through extrusion, The above-mentioned extrusion step is to extrude with a forming pressure of 10-50 kgf/cm2 to initially discharge excess water and shape the raw material of the board; finally, the curing step is equipped with a high-temperature and high-pressure steam curing room for the board. The initial material is placed in the high-temperature and high-pressure steam curing room for high-temperature and high-pressure steam curing, and the temperature is 80-170°C for curing to accelerate the hardening of the initial material of the board, so that the raw material of the board can form the environmentally friendly fiber board; Moreover, in this embodiment, a drying step is included in the extruding step and curing step. The drying step refers to placing the board at room temperature for drying and hardening, and the drying time is about 24 hours.

In this embodiment, the three groups of test numbers and related production conditions in the following table are used as the embodiment of the designed product for illustration: Specimen No. Lime-soil ratio Dry material: fiber cement(%) Reduction ballast (%) Amount of fly ash (%) pulp(%) Forming pressure (kgf/cm ² ) Curing temperature (℃) R0110357030 0.35 1:1 24.7 49.6 21.2 4.5 10 80 R0110356040 0.35 1:1 24.8 42.4 28.3 4.5 10 80 R0110457030 0.45 1:1 29.6 46.1 19.8 4.5 10 80 R0110456040 0.45 1:1 29.6 39.5 26.4 4.5 10 80 R0120357030 0.35 1:2 23.7 47.4 20.3 8.6 10 80 R0120356040 0.35 1:2 23.7 40.6 27.1 8.6 10 80 R0120457030 0.45 1:2 28.3 44.1 18.9 8.6 10 80 R0120456040 0.45 1:2 28.3 37.8 25.2 8.6 10 80 R0125357030 0.35 1:2.5 23.2 46.4 19.9 10.5 40 170 R0125356040 0.35 1:2.5 23.2 39.8 26.5 10.5 40 170 R0125457030 0.45 1:2.5 27.7 43.2 18.5 10.5 40 170 R0125456040 0.45 1:2.5 27.7 37.0 24.7 10.5 40 170

For the test results of bulk density, water absorption rate, and water absorption length change rate of die-casting sheets, the test is mainly carried out according to the test methods in the CNS 3802 and CNS 13777 standards. The test is shown in the following table: Specimen No. Bulk density (g/cm3) Water absorption (%) Change rate of water absorption length (%) CNS 3802 specification requirements CNS 13777 specification requirements R0110357030 1.28 34.18 0.166 Cement fiber board 0.8 board: bulk density = 0.6 ~ 0.9 (g/cm3); water absorption rate is not required; water absorption length change rate (%) = below 0.25. Cement fiber board 1.0 board: bulk density = 0.9 ~ 1.2 (g/cm3); water absorption rate is not required; water absorption length change rate (%) = below 0.25. Calcium silicate board 1.0 FK: Bulk density = 0.9-1.2 (g/cm3); Water absorption rate = No requirement Water absorption length change rate (%) = below 0.15 R0110356040 1.29 34.18 0.157 R0110457030 1.32 32.43 0.181 R0110456040 1.28 33.60 0.174 R0120357030 1.01 49.67 0.184 R0120356040 1.05 46.06 0.159 R0120457030 1.14 40.91 0.158 R0120456040 1.05 47.61 0.182 R0125357030 1.23 37.29 0.126 R0125356040 1.21 38.37 0.179 R0125457030 1.25 35.69 0.123 R0125456040 1.24 34.33 0.143

As shown in the previous experimental example, the dry weight of the samples in this group of samples with a ratio of dry material weight to fiber amount of 1:1, after being steamed at 80°C for 24 hours at a forming pressure of 10kgf/cm ² , the drying unit weight of the samples 1.33-1.40 g/cm ³ , water absorption rate 32~34.5%, water absorption length change rate 0.15~0.19%; dry material weight: fiber amount ratio of 1:2 for this group of samples, with a forming pressure of 10kgf/cm ² and After steaming at 80°C for 24 hours, the drying unit weight of the sample is 1.00-1.15 g/cm ³ , the water absorption rate is 40-50%, and the water absorption length change rate is 0.15-0.19%; dry weight: fiber content The ratio of this group of samples is 1:2.5. After forming at a pressure of 40kgf/cm ² and steaming at 170°C for 6 hours, the drying unit weight of the samples is 1.21-1.25 g/cm ³ , and the water absorption rate is 34-39%. , The change rate of water absorption length is 0.12~0.18%.

For the bending strength and bending load test results of the die-casting sheet, the test is mainly carried out according to the test methods in the CNS 3802 and CNS 13777 standards. The test is shown in the following table: Specimen No. Plate thickness (mm) Bending strength (N/mm ² ) Bending load (N) CNS 3802 specification requirements CNS 13777 specification requirements R0110357030 11.35 9.39 727.47 Cement fiber board 0.8 board: thickness mm / bending load (N) 8 > 210 9 > 270 10 > 330 12 > 480 cement fiber board 1.0 board: thickness mm / bending load (N) 8 > 350 9 > 450 10 > 550 12 >800 Calcium silicate board 1.0 FK: The bending strength is above 13N/ ^mm2 . R0110356040 11.30 9.97 819.02 R0110457030 10.98 8.63 709.20 R0110456040 12.01 8.82 681.70 R0120357030 12.26 5.66 416.18 R0120356040 11.34 4.13 306.30 R0120457030 11.21 5.97 461.95 R0120456040 11.36 5.64 443.60 R0125357030 7.81 12.21 495.18 R0125356040 7.96 13.40 565.71 R0125457030 7.74 12.53 471.11 R0125456040 7.92 13.84 577.92

The results of the bending test and bending load test show that the ratio of fiber content is 1:1. In this group of samples, the ratio of lime to soil is 0.35, the ratio of reducing ballast to 60%, fly ash to 40%, and the forming pressure to 10kgf/cm ² . The steam curing temperature is 80°C, the best, the flexural load is 819.02N, the flexural strength is 9.97 N/mm ² ; the fiber content ratio is 1:2. In this group of samples, the lime-soil ratio is 0.45, and the reduced ballast is added with 70%, Adding 30% fly ash, forming pressure 10kgf/cm ² , steam curing temperature 80°C is the best, bending load is 461.95N, bending strength is 5.97 N/mm ² ; fiber content ratio is 1: 2.5 In this group of samples, the ratio of lime to soil is 0.45, the ratio of reducing ballast to 60%, fly ash to 40%, the forming pressure to 40kgf/cm ² , steam curing temperature to 170°C are the best, and the bending load is 577.93N, The flexural strength is 13.84 N/mm ^{2 ,} which can be seen from the examples to have good mechanical properties.

Furthermore, the table below shows the dissolution test results of the toxicity characteristics of each sample number: Specimen No. Toxicity Properties Dissolution Test Results As Ba Cd Cr Cr6 ⁺ Cu Hg Pb Se Unit: mg/L R0110357030 ND 3.261 ND 0.015 ND ND ND ND 0.009 R0110356040 ND 2.364 ND 0.013 ND ND ND ND 0.012 R0110457030 ND 3.420 ND 0.011 ND ND ND ND ND R0110456040 ND 2.943 ND 0.009 ND ND ND ND 0.008 R0120357030 ND 2.864 ND 0.016 ND ND ND ND 0.011 R0120356040 ND 3.162 ND 0.013 ND ND ND ND 0.009 R0120457030 ND 3.064 ND 0.013 ND ND ND ND 0.006 R0120456040 ND 2.864 ND 0.009 ND ND ND ND ND R0125357030 ND 3.084 ND 0.015 ND ND ND ND 0.007 R0125356040 ND 2.642 ND 0.021 ND ND ND ND 0.013 R0125457030 ND 2.762 ND 0.017 ND ND ND ND 0.006 R0125456040 ND 3.165 ND 0.016 ND ND ND ND 0.009 TCLP specification value 5.0 100.0 1.0 5.0 2.5 15.0 0.2 5.0 1.0

As shown in the above table, the solubility tests of various metals are all lower than the standard values of dissolution tests in regulations. Therefore, the environmentally friendly fiber board of the present invention has good performance in terms of mechanical properties and stable properties.

To sum up the foregoing, the present invention's environmentally friendly fiberboard and its manufacturing method utilize 35 to 60 percent by weight of stainless steel reduction ballast, 10 to 35 percent by weight of cement, 15 to 35 percent by weight of fly ash from a power plant, and 5 to 20 percent by weight of After pulping, it goes through the steps of stirring, mixing, extrusion and curing to produce an environmentally friendly fiber board with good mechanical properties and stable properties. Through stainless steel reduction slag and power plant fly ash containing a high proportion of industrial by-products , and produce an environment-friendly fiber plate with good mechanical properties and stable properties, so the purpose of the present invention can indeed be achieved.

But the above is only to illustrate the preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all the simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention , should still fall within the scope covered by the patent of the present invention.

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Fig. 1 is a schematic flow chart of the first preferred embodiment of the present invention.

Claims (1)

A method for manufacturing an environmentally friendly fiber board, which includes: a material preparation step, a 35-60 weight percent stainless steel reduction ballast, a 10-35 weight percent cement, and a 15-35 weight percent power plant fly ash, and a 5~20% by weight of paper pulp, wherein the particle size of the stainless steel reduction slag needs to pass through a # 40 mesh screen; a stirring step, which first adds water to the pulp and then homogeneously stirs it into a liquid pulp, and the ratio of the pulp to water is proportional The range is 1:10~1:40; a mixing step, which mixes the liquid pulp, stainless steel reduction slag, cement and power plant fly ash according to the ratio in the material preparation step; a extrusion step, which It has a mold, which pours the slurry into the mold, and uses 10~50kgf/cm2 to squeeze out excess water, and then performs demoulding to form a raw plate material; and a curing step, which has a high temperature and high pressure steam curing room, which places the raw board material in the high-temperature and high-pressure steam curing chamber, and performs high-temperature and high-pressure steam curing at 80-170°C, and after accelerated hardening, the raw board material is formed into the environmentally friendly fiber board.

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