Anti-aging non-PVC foaming wood-plastic floor and preparation process thereof

Abstract

The invention relates to an anti-aging non-PVC (polyvinyl chloride) foaming wood-plastic floor and a preparation process thereof. The anti-aging non-PVC foamed wood-plastic floor is prepared from wood flour, polypropylene resin, modified anti-aging agent master batch, a foaming agent, filler and maleic anhydride grafted polypropylene, wherein the modified anti-aging agent master batch comprises an ultraviolet light absorber, a light stabilizer, a coupling agent and functionalized grafted polypropylene. According to the anti-aging non-PVC foamed wood-plastic floor disclosed by the invention, the modified anti-aging agent master batch, the coupling agent and the functionalized grafted polypropylene matrix are effectively combined, so that the interfacial compatibility between the anti-aging agent and the matrix is enhanced, and the dispersibility and the stability of the ultraviolet light absorber and the light stabilizer are remarkably improved, thereby reducing the occurrence of an aging effect. Through the optimal design, the anti-aging performance, the tensile strength and the color change performance of the foamed wood-plastic floor are all improved.

Description

Technical Field

[0001] The invention relates to a wood plastic floor material, in particular to an anti-aging non-PVC foamed wood plastic floor and a preparation process thereof. Background Art

[0002] Wood plastic composites (WPC) have been widely used in the flooring field due to their environmental friendliness and excellent performance. However, non-PVC-based wood plastic flooring (non-PVC WPC) has become a hot spot for market research and development because it does not contain chlorine and has better environmental properties. However, wood plastic composite flooring is inevitably affected by environmental factors such as ultraviolet rays, high temperature, and humidity during long-term use, resulting in aging, discoloration, cracking, and decreased mechanical properties.

[0003] The addition of anti-aging agents is the main means to improve the anti-aging performance of wood plastic flooring. Existing anti-aging agents mainly include antioxidants, light stabilizers, ultraviolet absorbers, etc., which are usually used alone or in combination to slow down the aging process of materials. However, the application of traditional anti-aging agents in polymer materials faces two major problems: poor dispersibility and poor stability.

[0004] Poor dispersibility is due to the poor compatibility between the antioxidant and the polymer matrix, which makes it impossible for the antioxidant to be evenly dispersed in the matrix, forming areas with higher or lower local concentrations, making the effect of the antioxidant uneven. This not only affects the effectiveness of the antioxidant, but may also cause aging of the material during long-term use. In addition, the large particle size and complex molecular structure of the antioxidant also make it easy to agglomerate during the melt processing, further exacerbating the dispersion problem.

[0005] The problem of poor stability is mainly reflected in the degradation, volatilization and migration of anti-aging agents under harsh environmental conditions such as high temperature, humidity and ultraviolet rays. Some anti-aging agents are prone to decomposition or volatilization during high-temperature processing or long-term use, resulting in the gradual weakening of their anti-aging effect, which ultimately affects the long-term performance of wood-plastic composite materials. At the same time, some anti-aging agents may migrate or precipitate during long-term use due to unstable structure or poor compatibility with the base material, resulting in further reduction of their effect. Therefore, improving the dispersibility and stability of anti-aging agents is the key to improving the anti-aging performance of wood-plastic flooring. Summary of the invention

[0006] The object of the present invention is to provide an anti-aging non-PVC foamed wood plastic floor and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0007] The invention discloses an anti-aging non-PVC foamed wood plastic floor, comprising wood powder, polypropylene resin, modified anti-aging agent masterbatch, foaming agent, filler and maleic anhydride grafted polypropylene;

[0008] The modified anti-aging agent masterbatch comprises an ultraviolet absorber, a light stabilizer, a coupling agent and functionalized grafted polypropylene.

[0009] Preferably, the modified antioxidant masterbatch comprises the following raw materials in parts by weight:

[0010] 50-150 parts of ultraviolet absorber;

[0011] Light stabilizer 50-150 parts;

[0012] 5-15 parts of coupling agent;

[0013] Functionalized grafted polypropylene 15-45 parts.

[0014] The functionalized grafted polypropylene refers to a modified polymer having chemical functional groups (such as maleic anhydride, carboxyl, acrylic acid, silane, amine, maleimide, etc.) introduced into the polypropylene molecular chain.

[0015] Preferably, the functionalized grafted polypropylene is at least one of vinyl silane grafted polypropylene (PP-g-VS), maleimide grafted polypropylene (PP-g-MI), diphenyl carbonate grafted polypropylene (PP-g-DPC), carboxyl grafted polypropylene (PP-g-COOH), acrylic acid grafted polypropylene (PP-g-AA), alkylamine grafted polypropylene (PP-g-ALK-NH2) and maleic anhydride grafted polypropylene (PP-g-MAH).

[0016] Further preferably, the functionalized grafted polypropylene is at least one of maleimide grafted polypropylene, diphenyl carbonate grafted polypropylene and maleic anhydride grafted polypropylene.

[0017] Still further preferably, the functionalized grafted polypropylene is a mixture of maleimide grafted polypropylene and diphenyl carbonate grafted polypropylene. Optimally, the mass ratio of maleimide grafted polypropylene to diphenyl carbonate grafted polypropylene is 10:(2-4).

[0018] The ultraviolet absorber is ultraviolet absorber UV-1577.

[0019] The light stabilizer is light stabilizer Tinuvin770.

[0020] The modified anti-aging agent masterbatch is prepared by the following method: ultraviolet absorber, light stabilizer, coupling agent and functionalized grafted polypropylene are mixed and then extruded.

[0021] Preferably, the anti-aging non-PVC foamed wood plastic flooring comprises the following raw materials by mass percentage:

[0022] Wood flour 40-65%;

[0023] Modified anti-aging agent masterbatch 0.5-2.5%;

[0024] Foaming agent 1-4%;

[0025] Filler 1-9%;

[0026] Maleic anhydride grafted polypropylene 1-4%;

[0027] The balance is polypropylene resin.

[0028] Preferably, the anti-aging non-PVC foamed wood plastic flooring comprises the following raw materials by mass percentage:

[0029] Wood flour 50-60%;

[0030] Modified anti-aging agent masterbatch 1-2%;

[0031] Foaming agent 1-3%;

[0032] Filler 3-7%;

[0033] Maleic anhydride grafted polypropylene 1-3%;

[0034] The balance is polypropylene resin.

[0035] Preferably, the filler is at least one of talc and calcium carbonate.

[0036] The invention also discloses a preparation process of an anti-aging non-PVC foamed wood plastic floor, comprising the following steps: mixing wood powder, polypropylene resin, modified anti-aging agent masterbatch, foaming agent, filler and maleic anhydride grafted polypropylene, and screw extruding.

[0037] The anti-aging non-PVC foamed wood plastic floor of the present invention enhances the interface compatibility between the anti-aging agent and the matrix by applying modified anti-aging agent masterbatch, coupling agent and functionalized grafted polypropylene matrix, significantly improves the dispersibility and stability of ultraviolet absorber and light stabilizer, thereby reducing the occurrence of aging effect. Through this optimized design, the anti-aging performance, tensile strength and color change performance of the foamed wood plastic floor are significantly improved. DETAILED DESCRIPTION

[0038] Wood flour, particle size 100-200 mesh, moisture content 0.2%;

[0039] Calcium carbonate, powder particle size 200-300 mesh;

[0040] Polypropylene resin, using Sinopec PPH-T03 polypropylene;

[0041] Maleic anhydride grafted polypropylene, using Honeywell propylene-maleic anhydride copolymer wax powder

[0042] Diphenyl carbonate grafted polypropylene, wherein the grafted monomer diphenyl carbonate is 3-7%. In the specific embodiment, it is prepared by the method of Example 3 of CN117844160A, and the grafted monomer maleimide is 4.3%.

[0043] Maleimide grafted polypropylene, wherein the grafted monomer maleimide is 3-7%. In the specific embodiment, it is prepared by the method of Example 5 of CN117844160A, wherein the grafted monomer maleimide is 4.9%.

[0044] Example 1

[0045] Modified anti-aging agent masterbatch, specific formula:

[0046] Ultraviolet absorber UV-1577: 1000g;

[0047] Light stabilizer Tinuvin770: 1000 g;

[0048] Coupling agent KH-550: 100 g;

[0049] Functionalized grafted polypropylene: 300 g.

[0050] The functionalized grafted polypropylene is maleic anhydride grafted polypropylene.

[0051] The preparation process of the modified anti-aging agent masterbatch:

[0052] The ultraviolet absorber UV-1577 and the light stabilizer Tinuvin770 are mixed, and then the coupling agent KH-550 is added, and the stirring is continued, and then the functionalized grafted polypropylene is added and mixed, and then the mixture is sent into a twin-screw extruder for extrusion to obtain the modified anti-aging agent masterbatch.

[0053] An anti-aging non-PVC foamed wood plastic floor, with the following specific formula:

[0054] 54.5 kg of wood flour;

[0055] 35 kg of polypropylene resin;

[0056] 1.5 kg modified anti-aging agent masterbatch;

[0057] AC foaming agent 2 kg;

[0058] 5 kg calcium carbonate;

[0059] 2 kg of maleic anhydride grafted polypropylene.

[0060] The preparation process of the foamed wood plastic floor:

[0061] The wood powder, polypropylene resin and calcium carbonate are dry-mixed, and then the modified anti-aging agent masterbatch, maleic anhydride grafted polypropylene and AC foaming agent are added and continued to be mixed evenly.

[0062] The mixture is fed into a twin-screw extruder for extrusion, cooled, and cut into corresponding 8mm thick floors, ready for subsequent testing and packaging.

[0063] Embodiment 2:

[0064] The only difference from Example 1 is that the functionalized grafted polypropylene is diphenyl carbonate grafted polypropylene.

[0065] Embodiment 3:

[0066] The only difference from Example 1 is that the functionalized grafted polypropylene is maleimide grafted polypropylene.

[0067] Embodiment 4:

[0068] The only difference from Example 1 is that the functionalized grafted polypropylene is a mixture of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene, and the mass ratio of the two is 10:1.

[0069] Embodiment 5:

[0070] The only difference from Example 1 is that the functionalized grafted polypropylene is a mixture of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene, and the mass ratio of the two is 10:2.

[0071] Embodiment 6:

[0072] The only difference from Example 1 is that the functionalized grafted polypropylene is a mixture of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene, and the mass ratio of the two is 10:3.

[0073] Embodiment 7:

[0074] The only difference from Example 1 is that the functionalized grafted polypropylene is a mixture of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene, and the mass ratio of the two is 10:4.

[0075] Embodiment 8:

[0076] The only difference from Example 1 is that the functionalized grafted polypropylene is a mixture of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene, and the mass ratio of the two is 10:5.

[0077] Comparative Example 1:

[0078] Non-PVC foamed wood plastic floor, specific formula:

[0079] Wood flour: 55 kg

[0080] Polypropylene resin: 35 kg

[0081] AC foaming agent: 2 kg

[0082] Calcium carbonate: 5 kg

[0083] Maleic anhydride grafted polypropylene: 2 kg

[0084] The preparation process of the foamed wood plastic floor:

[0085] The wood powder, polypropylene resin and calcium carbonate are dry-mixed, and then maleic anhydride grafted polypropylene and AC foaming agent are added and continued to mix evenly.

[0086] The mixture is fed into a twin-screw extruder for extrusion, cooled, and cut into corresponding 8mm thick floors, ready for subsequent testing and packaging.

[0087] Comparative Example 2:

[0088] Non-PVC foamed wood plastic floor, specific formula:

[0089] Wood flour: 54.5 kg;

[0090] Polypropylene resin: 35 kg;

[0091] AC foaming agent: 2 kg;

[0092] Calcium carbonate: 5 kg;

[0093] Ultraviolet absorber UV-1577: 625g;

[0094] Light stabilizer Tinuvin 770: 625 g;

[0095] Maleic anhydride grafted polypropylene: 2 kg.

[0096] The preparation process of the foamed wood plastic floor:

[0097] The wood powder, polypropylene resin and calcium carbonate are dry-mixed, and then ultraviolet absorber UV-1577, light stabilizer Ti nuvin770, maleic anhydride grafted polypropylene and AC foaming agent are added and continued to be mixed evenly.

[0098] The mixture is fed into a twin-screw extruder for extrusion, cooled, and cut into corresponding 8mm thick floors, ready for subsequent testing and packaging.

[0099] Test example:

[0100] At a 35KGy irradiation dose, the 20cm×20cm×8mm wood plastic foam floor was treated with gamma rays, and its color difference ΔE, yellow index and tensile strength were tested respectively. The color difference ΔE was determined with reference to CIEDE2000, the yellow index was determined with reference to GB / T 2409-1980, and the tensile strength was tested with reference to GB / T 1040.2-2022.

[0101] Color difference ΔE Yellow Index Tensile strength retention, % Example 1 4.9 6.4 90.7 Example 2 3.5 4.9 93.4 Example 3 2.8 3.8 94.2 Example 4 2.9 3.7 94.0 Example 5 2.4 3.2 95.1 Example 6 1.8 2.6 96.5 Example 7 2.1 3.0 95.3 Example 8 3.0 4.1 93.8 Comparative Example 1 18.6 23.4 82.3 Comparative Example 2 6.4 9.7 87.5

[0102] Comparison of Examples 1-8 with Comparative Example 2 shows that the addition amount of modified anti-aging agent masterbatch and the optimization of the formula significantly improve the anti-aging performance of the wood plastic floor. Through the application of modified anti-aging agent masterbatch, the dispersibility and stability of the ultraviolet absorber UV-1577 and the light stabilizer Tinuvin770 are effectively improved, and the effective combination of the coupling agent KH-550 and the functionalized grafted polypropylene matrix enhances the interface compatibility between the anti-aging agent and the matrix, thereby reducing the aging effect of the material. Compared with Comparative Example 2, Examples 1-8 have achieved significant improvements in anti-aging performance, tensile strength and color change performance.

[0103] Comparing Examples 1-3, it can be seen that the maleimide grafted polypropylene used in Example 3 is superior to the maleic anhydride grafted polypropylene in Example 1 and the diphenyl carbonate grafted polypropylene in Example 2 in terms of anti-aging performance. In particular, in terms of high temperature resistance, moisture resistance and interface bonding strength, the performance of Example 3 is more outstanding. Maleimide grafted polypropylene significantly enhances the material's UV absorption and heat aging resistance by improving the interface compatibility of the polymer with wood powder and polypropylene matrix, thereby effectively delaying the aging process of the wood plastic floor and improving the long-term durability of the material.

[0104] Examples 5-7 demonstrate the synergistic effect of diphenyl carbonate grafted polypropylene and maleimide grafted polypropylene at a specific mass ratio. Through a reasonable mass ratio, the combination of the two optimizes the dispersibility and interfacial bonding strength and improves the overall anti-aging performance. In contrast, Examples 4 and 8 failed to achieve the expected synergistic effect, indicating that the ratio and combination of the two have a significant impact on the effect. Therefore, an appropriate ratio of grafted polypropylene is important for improving the durability and performance of foamed wood plastic flooring.

Claims

1. An anti-aging non-PVC foamed wood plastic floor, comprising wood flour, polypropylene resin, modified anti-aging agent masterbatch, foaming agent, filler and maleic anhydride grafted polypropylene; characterized in that: The modified anti-aging agent masterbatch comprises an ultraviolet absorber, a light stabilizer, a coupling agent and functionalized grafted polypropylene.

2. The anti-aging non-PVC foamed wood plastic flooring according to claim 1, characterized in that: The modified anti-aging agent masterbatch comprises the following raw materials in parts by weight: 50-150 parts of ultraviolet absorber; Light stabilizer 50-150 parts; 5-15 parts of coupling agent; Functionalized grafted polypropylene 15-45 parts.

3. The anti-aging non-PVC foamed wood plastic flooring according to claim 2, characterized in that: The functionalized grafted polypropylene is at least one of vinyl silane grafted polypropylene, maleimide grafted polypropylene, diphenyl carbonate grafted polypropylene, carboxyl grafted polypropylene, acrylic acid grafted polypropylene, alkylamine grafted polypropylene and maleic anhydride grafted polypropylene.

4. The anti-aging non-PVC foamed wood plastic flooring according to claim 3, characterized in that: The functionalized grafted polypropylene is at least one of maleimide grafted polypropylene, diphenyl carbonate grafted polypropylene and maleic anhydride grafted polypropylene.

5. The anti-aging non-PVC foamed wood plastic flooring according to claim 3, characterized in that: The ultraviolet absorber is ultraviolet absorber UV-1577.

6. The anti-aging non-PVC foamed wood plastic flooring according to claim 3, characterized in that: The light stabilizer is light stabilizer Tinuvin770.

7. The anti-aging non-PVC foamed wood plastic flooring according to claim 3, characterized in that: The anti-aging non-PVC foamed wood plastic floor comprises the following raw materials by mass percentage: Wood flour 40-65%; Modified anti-aging agent masterbatch 0.5-2.5%; Foaming agent 1-4%; Filler 1-9%; Maleic anhydride grafted polypropylene 1-4%; The balance is polypropylene resin.

8. The anti-aging non-PVC foamed wood plastic flooring according to claim 7, characterized in that: The anti-aging non-PVC foamed wood plastic floor comprises the following raw materials by mass percentage: Wood flour 50-60%; Modified anti-aging agent masterbatch 1-2%; Foaming agent 1-3%; Filler 3-7%; Maleic anhydride grafted polypropylene 1-3%; The balance is polypropylene resin.

9. The anti-aging non-PVC foamed wood plastic flooring according to claim 3, characterized in that: The filler is at least one of talc and calcium carbonate.

10. The preparation process of the anti-aging non-PVC foamed wood plastic floor according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing wood powder, polypropylene resin, modified anti-aging agent master batch, foaming agent, filler and maleic anhydride grafted polypropylene, and screw extruding.