Flame-retardant biomass-based composite door frame material

Abstract

The invention relates to a flame-retardant biomass-based composite door frame material which is prepared from biomass material wood shavings and modified magnesium oxysulfate cement through mold shaping, cold pressing and aging processes. Wherein the mass ratio of the biomass material wood shavings to the modified magnesium oxysulfate cement is (50: 50)-(30: 70); the modified magnesium oxysulfate cement is obtained by modifying a tannic acid-polyethyleneimine adhesive. The door frame material disclosed by the invention has the beneficial effects that the door frame material is formed by hardening the inorganic magnesium oxysulfate cement serving as a main material and the biomass material wood shavings serving as a reinforcing material at normal temperature and has excellent mechanical strength, and the magnesium oxysulfate cement cannot corrode metal components.

Description

Technical Field

[0001] The present invention relates to the technical field of door frame material preparation, and more precisely, it relates to a flame-retardant biomass-based composite door frame material. Background Art

[0002] Traditional door frame materials are mainly made of laminated veneer lumber and solid wood, which have deficiencies such as being prone to deformation, non-flame-retardant, and having a relatively high cost. Using woody residues and crop straw shavings during the processing of wood and furniture enterprises as raw materials, and magnesium oxychloride cement that is fast-hardening, lightweight, early-strength, and fire-resistant as an adhesive, an organic-inorganic magnesium oxychloride cement-biomass-based composite material has been developed for the preparation of fireproof door frames. However, at present, the magnesium oxychloride cement-biomass-based composite material still has problems such as low compressive and flexural strengths, insufficient nail-holding power, and a relatively low proportion of biomass materials, resulting in a relatively high cost, which affects its wide application. There are mainly two reasons for the low mechanical properties of the magnesium oxychloride cement-biomass composite material: one is that the magnesium oxychloride cement itself has low strength, unstable volume, and poor water resistance; the other is that the magnesium oxychloride cement is an inorganic material, and there is an interfacial incompatibility problem when combined with organic biomass materials. At the same time, a high proportion of biomass materials will further exacerbate the interfacial compatibility problem, thereby reducing the overall performance of the composite material. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the prior art and propose a flame-retardant biomass-based composite door frame material.

[0004] In the first aspect, a flame-retardant biomass-based composite door frame material is provided, which is prepared from biomass material shavings and modified magnesium oxychloride cement through processes such as mold shaping, cold pressing, and aging.

[0005] Among them, the mass ratio of the biomass material shavings to the modified magnesium oxychloride cement is 50:50 - 30:70; the modified magnesium oxychloride cement is obtained by modifying with tannic acid-polyethyleneimine adhesive.

[0006] Preferably, in the tannic acid-polyethyleneimine adhesive, the mass ratio of tannic acid to polyethyleneimine is 2:1 - 1:2.

[0007] Preferably, the addition amount of the tannic acid-polyethyleneimine adhesive is 0.5% - 5% of the magnesium oxychloride cement.

[0008] In the second aspect, a preparation method of the flame-retardant biomass-based composite door frame material according to any one of the first aspect is provided, including:

[0009] Step 1: Mix tannic acid and polyethyleneimine in proportion to prepare a tannic acid-polyethyleneimine adhesive.

[0010] Step 2: Mix magnesium oxysulfate cement with the tannic acid-polyethyleneimine adhesive in proportion to obtain modified magnesium oxysulfate cement;

[0011] Step 3: Mix biomass material shavings with the modified magnesium oxysulfate cement in proportion and stir into a uniform slurry;

[0012] Step 4: Inject the slurry into a mold, cold press and shape it, and then store it to obtain a flame-retardant biomass-based composite door frame material.

[0013] Preferably, in Step 3, the biomass material shavings are obtained by sorting the residues from wood processing, waste wood products, agricultural and forestry waste, and straw after crushing.

[0014] Preferably, in Step 4, the storage conditions are a temperature of 20°C - 30°C and a time of 7 days - 28 days.

[0015] Preferably, in Step 4, the pressure of the cold pressing is 1.5 MPa - 5 MPa.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The door frame material of the present invention is mainly made of inorganic magnesium oxysulfate cement and biomass material shavings as the reinforcing material, and is hardened at room temperature, having excellent mechanical strength, and the magnesium oxysulfate cement will not corrode metal components.

[0018] 2. All the biomass material shavings of the door frame material of the present invention are derived from residues from wood processing, waste wood products, agricultural and forestry waste, straw, etc., which can greatly reduce the production cost.

[0019] 3. The present invention has better flame retardancy and is not easily deformed compared with traditional wooden door frame materials.

[0020] 4. The preparation process of the door frame material of the present invention is simple and does not involve any toxic and harmful substances, being green and environmentally friendly. Brief Description of the Drawings

[0021] Figure 1 It is a flowchart of the preparation of the flame-retardant biomass-based composite door frame material provided by this application. Detailed Embodiments

[0022] The following further describes the present invention with reference to embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0023] Example 1:

[0024] The present invention intends to modify magnesium oxysulfate cement with a reactive biomass-based adhesive. Through structural design and optimization of the preparation process, on the premise of ensuring a high filling amount of biomass particles, high strength of the magnesium oxysulfate cement-biomass-based composite material is achieved, and an organic-inorganic flame-retardant door frame composite material for fireproof doors with stable dimensions, high strength, and low cost is developed.

[0025] Prepare the following raw materials:

[0026] Biomass material particles: Obtained by pulverizing and sorting wood processing residues, waste wood products, agricultural and forestry waste, or straw, etc., and naturally dried to a moisture content of about 8-10%.

[0027] Magnesium oxysulfate cement: Prepared by mixing industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio.

[0028] Modifier: Industrial tannin and polyethyleneimine with a molecular weight greater than 7000 (such as polyethyleneimine with a molecular weight of 10000).

[0029] Specifically, as Figure 1 shown, the preparation method of the flame-retardant biomass-based composite door frame material includes:

[0030] Step 1: Mix the modifier tannin and polyethyleneimine in a mass ratio of 1:1, add an appropriate amount of water, stir evenly, and prepare a tannin-polyethyleneimine adhesive with a mass fraction of 30%.

[0031] Step 2: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (the traditional process mass ratio is 8:1:20), stir evenly, and prepare magnesium oxysulfate cement.

[0032] Step 3: Add 2% of the tannin-polyethyleneimine adhesive by the mass of magnesium oxysulfate cement to the magnesium oxysulfate cement, mix evenly, and obtain modified magnesium oxysulfate cement.

[0033] Step 4: Mix the biomass material particles and the magnesium oxysulfate cement prepared in Step 3 in a mass ratio of 50:50, stir evenly, and obtain a mixed slurry.

[0034] Step 5: Pour the mixed slurry obtained in Step 4 into a shaping mold, and under the conditions of 25°C and a pressure of 2.5 MPa, cold press for 1 day, and then store for 7 days to obtain the novel door frame material of the present invention.

[0035] Example 2:

[0036] On the basis of Example 1, Example 2 of the present application provides another preparation method of the flame-retardant biomass-based composite door frame material, including:

[0037] Step 1: Mix the modifier tannin and polyethyleneimine in a mass ratio of 1:1, add an appropriate amount of water, stir evenly, and prepare a tannin-polyethyleneimine adhesive with a mass fraction of 30%;

[0038] Step 2: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (mass ratio of 8:1:20 in the traditional process), stir evenly, and prepare magnesium oxysulfate cement;

[0039] Step 3: Add 2% of the tannin-polyethyleneimine adhesive based on the mass of the magnesium oxysulfate cement to the magnesium oxysulfate cement and mix evenly to obtain modified magnesium oxysulfate cement;

[0040] Step 4: Mix biomass material shavings and the magnesium oxysulfate cement prepared in Step 3 in a mass ratio of 30:70 and stir evenly to obtain a mixed slurry;

[0041] Step 5: Pour the mixed slurry obtained in Step 4 into a shaping mold, cold press for 1 day at 25°C under a pressure of 2.5 MPa, and then cure for 28 days to obtain the novel door frame material of the present invention.

[0042] Example 3:

[0043] Based on Example 1, Example 3 of the present application provides another preparation method of a flame-retardant biomass-based composite door frame material, including:

[0044] Step 1: Mix the modifier tannin and polyethyleneimine in a mass ratio of 1:2, add an appropriate amount of water, stir evenly, and prepare a tannin-polyethyleneimine adhesive with a mass fraction of 30%;

[0045] Step 2: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (mass ratio of 8:1:20 in the traditional process), stir evenly, and prepare magnesium oxysulfate cement;

[0046] Step 3: Add 2% of the tannin-polyethyleneimine adhesive based on the mass of the magnesium oxysulfate cement to the magnesium oxysulfate cement and mix evenly to obtain modified magnesium oxysulfate cement;

[0047] Step 4: Mix biomass material shavings and the magnesium oxysulfate cement prepared in Step 3 in a mass ratio of 30:70 and stir evenly to obtain a mixed slurry;

[0048] Step 5: Pour the mixed slurry obtained in Step 4 into a shaping mold, cold press for 1 day at 25°C under a pressure of 5 MPa, and then cure for 28 days to obtain the novel door frame material of the present invention.

[0049] Example 4:

[0050] Based on Example 1, Example 4 of the present application provides another preparation method of a flame-retardant biomass-based composite door frame material, including:

[0051] Step 1: Mix the modifier tannin and polyethyleneimine in a mass ratio of 1:2, add an appropriate amount of water, stir evenly, and prepare a tannin-polyethyleneimine adhesive with a mass fraction of 30%.

[0052] Step 2: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (traditional process mass ratio of 8:1:20), stir evenly, and prepare magnesium oxysulfate cement.

[0053] Step 3: Add 5% of the tannin-polyethyleneimine adhesive based on the mass of the magnesium oxysulfate cement to the magnesium oxysulfate cement and mix evenly to obtain modified magnesium oxysulfate cement.

[0054] Step 4: Mix biomass material shavings and the magnesium oxysulfate cement prepared in Step 3 in a mass ratio of 40:60 and stir evenly to obtain a mixed slurry.

[0055] Step 5: Pour the mixed slurry obtained in Step 4 into a shaping mold, cold press for 1 day at 25°C and a pressure of 5 MPa, and then store for 28 days to obtain the novel door frame material of the present invention.

[0056] Example 5:

[0057] On the basis of Example 1, Example 5 of the present application provides another preparation method of a flame-retardant biomass-based composite door frame material, including:

[0058] Step 1: Mix the modifier tannin and polyethyleneimine in a mass ratio of 2:1, add an appropriate amount of water, stir evenly, and prepare a tannin-polyethyleneimine adhesive with a mass fraction of 30%.

[0059] Step 2: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (traditional process mass ratio of 8:1:20), stir evenly, and prepare magnesium oxysulfate cement.

[0060] Step 3: Add 1% of the tannin-polyethyleneimine adhesive based on the mass of the magnesium oxysulfate cement to the magnesium oxysulfate cement and mix evenly to obtain modified magnesium oxysulfate cement.

[0061] Step 4: Mix biomass material shavings and the magnesium oxysulfate cement prepared in Step 3 in a mass ratio of 40:60 and stir evenly to obtain a mixed slurry.

[0062] Step 5: Pour the mixed slurry obtained in Step 4 into a shaping mold, cold press for 1 day at 25°C and a pressure of 2.5 MPa, and then store for 14 days to obtain the novel door frame material of the present invention.

[0063] Comparative Example 1:

[0064] The present application also provides a comparative example for preparing door frame materials, and the specific method is as follows:

[0065] Step 1: Mix industrial magnesium oxide, magnesium sulfate solution, and water in a certain ratio (traditional process mass ratio 8:1:20), stir evenly, and prepare magnesium oxysulfate cement;

[0066] Step 2: Mix biomass material shavings and the prepared magnesium oxysulfate cement in a mass ratio of 50:50 and stir evenly;

[0067] Step 3: Pour the mixed slurry into a shaping mold, and under the conditions of 25°C and a pressure of 2.5 MPa, cold press for 1 day, and then store for 7 days to obtain the door frame material.

[0068] Cut the door frame materials prepared in the comparative example and the examples in accordance with the cement particleboard standard GB / T 24312-2009, and test the flexural strength, nail holding force, internal bond strength, and combustion performance. The specific values are shown in Table 1 below:

[0069] Table 1

[0070]

[0071] In summary, the biomass-based door frame material prepared by the present invention not only has excellent mechanical strength (greater than the minimum requirement of the national standard), but also has good flame retardant performance, all reaching the B1 difficult combustion level and above, and is environmentally friendly and non-toxic. It makes full use of agricultural and forestry waste and wood processing residues, and has good cost advantages. The present invention has great competitive advantages and application potential for the preparation of door frames.

Claims

1. A flame-retardant biomass-based composite door frame material, characterized in that, It is prepared from biomass material shavings and modified magnesium oxychloride cement through the processes of mold shaping, cold pressing and aging. Among them, the mass ratio of the biomass material shavings to the modified magnesium oxychloride cement is 50:50 - 30:70; the modified magnesium oxychloride cement is obtained by modifying with tannic acid - polyethyleneimine adhesive.

2. The flame-retardant biomass-based composite door frame material according to claim 1, wherein, In the tannic acid - polyethyleneimine adhesive, the mass ratio of the tannic acid to the polyethyleneimine is 2:1 - 1:

2.

3. The flame-retardant biomass-based composite door frame material according to claim 2, wherein, The addition amount of the tannin - polyethyleneimine adhesive is 0.5% - 5% of the magnesium oxychloride cement.

4. A preparation method of the flame-retardant biomass-based composite door frame material as described in any one of claims 1 to 3, characterized in that, It includes: Step 1: Mix tannic acid and polyethyleneimine in proportion to prepare tannic acid - polyethyleneimine adhesive. Step 2: Mix magnesium oxychloride cement and the tannic acid - polyethyleneimine adhesive in proportion to obtain modified magnesium oxychloride cement. Step 3: Mix biomass material shavings and modified magnesium oxychloride cement in proportion and stir into a uniform slurry. Step 4: Inject the slurry into a mold, cold press and shape it, and then age to obtain a flame - retardant biomass - based composite door frame material.

5. The preparation method of the flame-retardant biomass-based composite door frame material according to claim 4, wherein, In Step 3, the biomass material shavings are obtained by sorting the residues from wood processing, waste wood products, agricultural and forestry waste, and straw after crushing.

6. The preparation method of the flame-retardant biomass-based composite door frame material according to claim 4, wherein, In Step 4, the aging conditions are a temperature of 20°C - 30°C and a time of 7 days - 28 days.

7. The preparation method of the flame-retardant biomass-based composite door frame material according to claim 4, characterized in that, In Step 4, the pressure of the cold pressing is 1.5 MPa - 5 MPa.

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