High‑stability PVC wood-plastic composite material and preparation method therefor
By adding β-diketones, phosphite compounds, and light stabilizers to PVC wood-plastic composites, the problems of insufficient stability and poor weather resistance during processing are solved, achieving improved stability and weather resistance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ANHUI KOJO NEW MATERIAL TECH CO LTD
- Filing Date
- 2024-12-31
- Publication Date
- 2026-07-02
AI Technical Summary
Existing PVC wood-plastic composite materials lack stability and have poor weather resistance during processing.
By adding stabilizing materials, including β-diketones, phosphite compounds, and light stabilizers, to PVC wood-plastic composites, and combining them with calcium carbonate, coupling agents, and other components, a synergistic effect is achieved, thereby improving the processing stability and weather resistance of the material.
It significantly improves the processing stability and weather resistance of PVC wood-plastic composite materials, ensuring that the materials are not easily degraded under the influence of heat and light, and maintain excellent performance.
Smart Images
Figure PCTCN2024144371-FTAPPB-I100001 
Figure PCTCN2024144371-FTAPPB-I100002 
Figure PCTCN2024144371-FTAPPB-I100003
Abstract
Description
Highly stable PVC wood-plastic composite materials and their preparation methods Technical Field
[0001] This invention relates to the field of wood-plastic composite materials technology, specifically to a highly stable PVC wood-plastic material and its preparation method. Background Technology
[0002] Wood-plastic composites are a new type of reversible, recyclable, and multipurpose material made primarily from renewable biomass resources such as woody / grass / vine plants and their processing residues. These are blended with a certain proportion of high-molecular polymer base materials and inorganic fillers, and processed using specialized additives and advanced physical, chemical, and bioengineering techniques. PVC wood-plastic composites are a major type of wood-plastic composite material, formed by melt blending polyvinyl chloride (PVC) with plant fiber materials (usually wood flour). It is environmentally friendly and combines the excellent properties of both wood and plastic.
[0003] Although PVC wood-plastic composite materials have outstanding advantages such as waterproofing, moisture resistance, corrosion and insect resistance, and excellent mechanical properties, during the PVC processing, the molecular structure of PVC wood-plastic composite materials contains residual double bonds and branched structures from the polymerization reaction. These structures are prone to degradation reactions under the action of heat and light, releasing hydrogen chloride, which leads to a decrease in the material's processing stability and poor weather resistance.
[0004] Based on this, the present invention discloses a highly stable PVC wood-plastic material and its preparation method. This material not only has excellent processing stability, but also outstanding weather resistance and other properties. Summary of the Invention
[0005] (a) Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this invention provides a highly stable PVC wood-plastic composite material and its preparation method, solving the problems of insufficient processing stability and poor weather resistance in existing PVC wood-plastic composite materials during use.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, the present invention provides the following technical solution:
[0009] High-stability PVC wood-plastic composite material comprises the following materials in parts by weight: 80-100 parts PVC resin, 20-30 parts wood flour, 15-30 parts calcium carbonate, 8-15 parts stabilizing agent, 4-8 parts stabilizer, 1-6 parts foaming agent, 1-2 parts coupling agent, 5-10 parts processing aid, and 1-4 parts lubricant; wherein the stabilizing agent includes β-diketone, phosphite compounds, and light stabilizer.
[0010] Preferably, the mass ratio of the β-diketone, phosphite compound, and light stabilizer is 1:(2-4):(0.1-0.3).
[0011] Preferably, the phosphite compounds include triethyl triphenylphosphate, tris(2,4-dichlorophenoxy) phosphate, and isopropyl triphenylphosphate in a mass ratio of 1:(1.7-2.4):(0.8-1.2).
[0012] Preferably, the light stabilizer comprises light stabilizer HPT, ascorbate palmitate, light stabilizer 770, and AM-101 in a mass ratio of 1:(0.7-1.3):(2-2.5):(0.3-0.6).
[0013] Preferably, it also includes 5-10 parts of maleic anhydride-grafted polyethylene or maleic anhydride-grafted polyvinyl chloride.
[0014] Preferably, the stabilizer is a mixture of calcium stearate, zinc stearate, and magnesium stearate.
[0015] Preferably, the foaming agent is azodicarbonamide.
[0016] Preferably, the coupling agent is a titanate or an aluminate.
[0017] Preferably, the lubricant is paraffin wax or silicone oil.
[0018] The preparation method of highly stable PVC wood-plastic composite material specifically includes the following steps:
[0019] First, heat the PVC resin to a molten state, stir it evenly, then add wood flour and calcium carbonate, and mix the above components evenly.
[0020] The stabilizing agent and the stabilizer are mixed evenly separately, and then the mixture is added to the above mixing system. Finally, the foaming agent, coupling agent, processing aid and lubricant are added to the mixing system and stirred to allow them to react.
[0021] After the reaction is complete, the material is melted, extruded, pressed, pulverized, and sieved to obtain the finished PVC wood-plastic composite material.
[0022] (III) Beneficial Effects
[0023] This invention provides a highly stable PVC wood-plastic composite material and its preparation method. Compared with the prior art, it has the following advantages:
[0024] 1. This invention adds stabilizing materials to the PVC wood-plastic material formulation system. The stabilizing materials are mainly β-diketone, phosphite compounds, and light stabilizers. Both β-diketone and phosphite compounds are heat stabilizers, and the two have a synergistic effect. In addition, the light stabilizer also has an assisted effect, which effectively improves the processing stability and toughness of PVC wood-plastic materials.
[0025] 2. Secondly, the stabilizing materials and stabilizers have a synergistic effect, which further improves the processing stability and toughness of PVC wood-plastic composite materials. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] This application provides a highly stable PVC wood-plastic composite material and its preparation method, which solves the problems of insufficient processing stability and poor weather resistance of existing PVC wood-plastic composite materials during use.
[0028] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.
[0029] All raw materials used in this invention were purchased from our partner manufacturers.
[0030] Example 1:
[0031] High-stability PVC wood-plastic composite material, comprising the following parts by weight:
[0032] The preparation method of highly stable PVC wood-plastic composite material specifically includes the following steps:
[0033] First, heat the PVC resin to a molten state, stir it evenly, then add wood flour and calcium carbonate, and mix the above components evenly.
[0034] The stabilizing agent and the stabilizer are mixed evenly separately, and then the mixture is added to the above mixing system. Finally, azodicarbonamide, titanate and paraffin are added to the mixing system and stirred to allow them to react.
[0035] After the reaction is complete, the material is melted, extruded, pressed, pulverized, and sieved to obtain the finished PVC wood-plastic composite material.
[0036] Example 2:
[0037] High-stability PVC wood-plastic composite material, comprising the following parts by weight:
[0038] The preparation method of highly stable PVC wood-plastic composite material specifically includes the following steps:
[0039] First, heat the PVC resin to a molten state, stir it evenly, then add wood flour and calcium carbonate, and mix the above components evenly.
[0040] The stabilizing agent and the stabilizer are mixed evenly separately, and then the mixture is added to the above mixing system. Finally, azodicarbonamide, aluminate and silicone oil are added to the mixing system and stirred to allow them to react.
[0041] After the reaction is complete, the material is melted, extruded, pressed, pulverized, and sieved to obtain the finished PVC wood-plastic composite material.
[0042] Example 3
[0043] High-stability PVC wood-plastic composite material, comprising the following parts by weight:
[0044] First, heat the PVC resin to a molten state, stir it evenly, then add wood flour and calcium carbonate, and mix the above components evenly.
[0045] The stabilizing agent and the stabilizer are mixed evenly separately, and then the mixture is added to the above mixing system. Finally, azodicarbonamide, titanate and silicone oil are added to the mixing system and stirred to allow them to react.
[0046] After the reaction is complete, the material is melted, extruded, pressed, pulverized, and sieved to obtain the finished PVC wood-plastic composite material.
[0047] Example 4 differs from Example 2 in that:
[0048] The PVC wood-plastic composite material system also includes 5 parts of maleic anhydride-grafted polyethylene.
[0049] Example 5 differs from Example 2 in that:
[0050] The PVC wood-plastic composite material system also includes 10 parts of maleic anhydride-grafted polyethylene.
[0051] Example 6 differs from Example 2 in that:
[0052] The PVC wood-plastic composite material system also includes 5 parts of maleic anhydride-grafted polyvinyl chloride.
[0053] Example 7 differs from Example 2 in that:
[0054] The PVC wood-plastic composite material system also includes 10 parts of maleic anhydride-grafted polyvinyl chloride.
[0055] The difference between Comparative Example 1 and Example 2 is as follows:
[0056] No stabilizing materials are added to the system.
[0057] Comparative Example 2 differs from Example 2 in that:
[0058] Remove β-diketone from the stabilizing material.
[0059] Comparative Example 3 differs from Example 2 in that:
[0060] Remove phosphite compounds from the stabilizing materials.
[0061] Comparative Example 4 differs from Example 2 in that:
[0062] Remove the light stabilizer from the stabilizing material.
[0063] Comparative Example 5 differs from Example 2 in that:
[0064] Replace the β-diketone in the stabilizing material with an organotin stabilizer.
[0065] Comparative Example 6 differs from Example 2 in that:
[0066] In the stabilizing material, the mass ratio of β-diketone, phosphite compound, and light stabilizer is 1:5:0.5.
[0067] Comparative Example 7 differs from Example 2 in that:
[0068] In the stabilizing material, the mass ratio of β-diketone, phosphite compound, and light stabilizer is 1:1:0.05.
[0069] Comparative Example 8 differs from Example 2 in that:
[0070] Remove triphenyl phosphate from the list of phosphite compounds.
[0071] Comparative Example 9 differs from Example 2 in that:
[0072] Remove triphenyl phosphate triethyl ester and tris(2,4-dichlorophenoxy) phosphate from the list of phosphite compounds.
[0073] Comparative Example 10 differs from Example 2 in that:
[0074] Replace tris(2,4-dichlorophenoxy) phosphate in the phosphite compounds with triphenyl phosphite.
[0075] Comparative Example 11 differs from Example 2 in that:
[0076] The tris(2,4-dichlorophenoxy) phosphate and triphenyl isopropyl phosphate in the phosphite compounds were replaced with triphenyl phosphite and polyethylene glycol di(2-methylpropanediol) phosphate, respectively.
[0077] Comparative Example 12 differs from Example 2 in that:
[0078] The mass ratio of triphenyl phosphate triethyl ester, tris(2,4-dichlorophenoxy) phosphate, and triphenyl isopropyl phosphate in the phosphite compounds is 1:2.6:1.5.
[0079] Comparative Example 13 differs from Example 2 in that:
[0080] The mass ratio of triphenyl phosphate triethyl ester, tris(2,4-dichlorophenoxy) phosphate, and triphenyl isopropyl phosphate in the phosphite compounds is 1:1.5:0.6.
[0081] Comparative Example 14 differs from Example 2 in that:
[0082] Remove the light stabilizers HPT and 770 from the light stabilizer list.
[0083] Comparative Example 15 differs from Example 2 in that:
[0084] Remove ascorbyl palmitate from the light stabilizer.
[0085] Comparative Example 16 differs from Example 2 in that:
[0086] Replace the light stabilizer HPT in the light stabilizer with light stabilizer 292.
[0087] Comparative Example 17 differs from Example 2 in that:
[0088] Replace light stabilizer 770 in the light stabilizer with light stabilizer 292.
[0089] Comparative Example 18 differs from Example 2 in that:
[0090] Replace the light stabilizers HPT and 770 in the light stabilizer with light stabilizers 292 and 944, respectively.
[0091] Comparative Example 19 differs from Example 2 in that:
[0092] Remove AM-101 from the light stabilizer.
[0093] Comparative Example 20 differs from Example 3 in that:
[0094] The mass ratio of light stabilizer HPT, ascorbate palmitate, light stabilizer 770, and AM-101 in the light stabilizer is 1:1.5:2.5:0.6.
[0095] Comparative Example 21 differs from Example 1 in that:
[0096] The mass ratio of light stabilizer HPT, ascorbate palmitate, light stabilizer 770, and AM-101 in the light stabilizer is 1:0.5:2:0.3.
[0097] Comparative Example 22 differs from Example 2 in that:
[0098] Remove the magnesium stearate component from the stabilizer.
[0099] Comparative Example 23 differs from Example 2 in that:
[0100] Remove the calcium stearate component from the stabilizer.
[0101] Comparative Example 24 differs from Example 2 in that:
[0102] Remove the magnesium stearate and zinc stearate components from the stabilizer.
[0103] Comparative Example 25 differs from Example 2 in that:
[0104] Replace zinc stearate in the stabilizer with barium stearate.
[0105] Performance test data
[0106] Samples were taken from the high heat-resistant PVC wood-plastic composite materials and their preparation methods prepared by the methods of Examples 1-7 and Comparative Examples 1-25, and the following performance tests were performed on each group of samples.
[0107] 1. Impact strength
[0108] The test was conducted according to the standard GB / T 1843-2008 "Determination of Impact Strength of Plastic Cantilever Beams". The sample size was 80mm×10mm×4mm. Six samples were tested and the average value was taken.
[0109] 2. Heat distortion temperature
[0110] The test was conducted according to ISO 75-2-2013 standard, with a test pressure of 1.82 MPa.
[0111] 3. High-temperature tensile property retention rate
[0112] According to ISO 527-2-2012 standard, the initial tensile strength of the samples was tested at room temperature (tensile rate 50 mm / min). Subsequently, the samples were subjected to high-temperature treatment at 120℃ for 2000 hours. If pulverization occurred during this period, it was recorded as "pulverization". If no pulverization occurred, the tensile strength of the high-temperature treated samples after aging was tested using the same method after the temperature dropped to room temperature. The retention rate was statistically recorded. If it exceeded 100%, it was uniformly recorded as ">100%". A retention rate greater than 100% indicates that the material's performance did not significantly degrade after aging, and the material has excellent heat resistance. The formula for calculating the high-temperature tensile property retention rate is: (Aging tensile strength / Initial tensile strength) × 100%.
[0113] 4. Weather resistance
[0114] Tested according to ISO 4892-3 standard.
[0115] The weather resistance of the samples was characterized using observational data from ultraviolet aging tests. Specifically, the cracking and fading of the samples under long-term exposure were observed by simulating ultraviolet radiation from sunlight.
[0116] Table 1 - Test data of various performance aspects of the samples
[0117] The data in Table 1 shows that:
[0118] 1. The sample experimental data of Examples 1-3 show that the samples prepared by the technical solution of the present invention have excellent processing stability, heat resistance, weather resistance and other properties.
[0119] 2. The experimental data of the samples in Examples 1-7 show that, based on the addition of stabilizing materials, the further addition of maleic anhydride-grafted polyethylene or maleic anhydride-grafted polyvinyl chloride to the system is beneficial to further improve the impact strength, stability, and toughness of the samples. This is because the stabilizing materials in the technical solution of this invention include multiple components, and their addition to the system may lead to problems with compatibility or dispersibility. Adding maleic anhydride-grafted polyethylene or maleic anhydride-grafted polyvinyl chloride can improve this defect and effectively enhance the compatibility and dispersibility of each component in the PVC wood-plastic composite material system.
[0120] 3. The experimental data of the samples in Examples 2 and Comparative Examples 1-5 show that the stabilizing material in the technical solution of the present invention has obvious stabilizing and toughness-enhancing effects, and the three components of β-diketone, phosphite compound and light stabilizer have synergistic effects. No matter whether one of the components is deleted or other components with similar effects are used to replace it, the technical effect brought about by the combined effect of the above three components cannot be achieved.
[0121] 4. The experimental data of the samples in Examples 2 and Comparative Examples 6-7 show that the ratio of the three components, β-diketone, phosphite compounds, and light stabilizers, also affects the overall stability of the system. Therefore, the ratio needs to be controlled within a suitable range to fully utilize the synergistic effect of the components.
[0122] 5. The phosphite compounds in this invention are selected from three components: triethyl triphenylphosphate, tris(2,4-dichlorophenoxy)phosphate, and isopropyl triphenylphosphate. Triethyl triphenylphosphate mainly affects the colorability of the material, maintaining its transparency and colorlessness, and exhibits strong thermal and oxidative stability. However, its improvement on the weather resistance and flowability of PVC wood-plastic composites is limited. Tris(2,4-dichlorophenoxy)phosphate mainly affects the chemical stability, processing performance, transparency, and electrical properties of the material, effectively preventing PVC decomposition during processing. It also compensates for the limited improvement in weather resistance by triethyl triphenylphosphate, enhancing the material's weather resistance and cold resistance. Isopropyl triphenylphosphate mainly affects the product's water absorption, aging, and fading, and possesses excellent antioxidant properties. Furthermore, experimental data from Examples 2 and Comparative Examples 8-11 demonstrate that these three components have a synergistic effect; replacing these components reduces the synergistic effect.
[0123] 6. The sample experimental data of Examples 2 and Comparative Examples 12-13 show that the ratio of the three components, triethyl triphenyl phosphate, tris(2,4-dichlorophenoxy) phosphate, and isopropyl triphenyl phosphate, also affects the overall stability of the system. Therefore, the ratio needs to be controlled within a suitable range to fully utilize the synergistic effect of the components.
[0124] 7. The light stabilizers selected in the technical solution of this invention are light stabilizer HPT, ascorbate palmitate, light stabilizer 770, and AM-101. Ascorbate palmitate has natural antioxidant properties, and AM-101, as a nickel-based quencher, enhances the effectiveness of the light stabilizers. In addition, the nickel ions in AM-101 can produce a certain synergistic catalytic effect with β-diketones, which enhances the stability of the system. Furthermore, according to the sample experimental data of Examples 2 and Comparative Examples 14-19, there is a synergistic effect among light stabilizers HPT, ascorbate palmitate, light stabilizer 770, and AM-101. Replacing any one of the four components will decrease the synergistic effect.
[0125] 8. The experimental data of the samples in Example 2 and Comparative Examples 20-21 show that the ratio of the four components, namely light stabilizer HPT, ascorbate palmitate, light stabilizer 770 and AM-101, also affects the overall stability of the system. Therefore, the ratio needs to be controlled within a suitable range to fully utilize the synergistic effect of the components.
[0126] 9. The stabilizer in the technical solution of this invention is a mixture of calcium stearate, magnesium stearate, and zinc stearate. Zinc stearate has excellent lubricity, low anti-mixing torque value, and slow gelation speed; calcium stearate and magnesium stearate have good gelation performance and high anti-mixing torque value. The three components work synergistically to improve the defects of each component. Moreover, since all three components are metal soaps, they can enhance the efficacy of β-diketone. Furthermore, the sample experimental data from Example 2 and Comparative Examples 22-24 can prove that the three components have a synergistic effect.
[0127] In summary, compared with existing technologies, it has the following beneficial effects:
[0128] 1. This invention adds stabilizing materials to the PVC wood-plastic material formulation system. The stabilizing materials are mainly β-diketone, phosphite compounds, and light stabilizers. Both β-diketone and phosphite compounds are heat stabilizers, and the two have a synergistic effect. In addition, the light stabilizer also has an assisted effect, which effectively improves the processing stability and toughness of PVC wood-plastic materials.
[0129] 2. Secondly, there is a synergistic effect between the stabilizing materials and the stabilizers. Calcium stearate, magnesium stearate, and zinc stearate are all metal soaps, which can enhance the efficacy of β-diketone, thus further improving the processing stability and toughness of PVC wood-plastic composite materials.
[0130] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0131] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A highly stable PVC wood-plastic composite material, characterized in that, The material comprises the following parts by weight: 80-100 parts PVC resin, 20-30 parts wood flour, 15-30 parts calcium carbonate, 8-15 parts stabilizing agent, 4-8 parts stabilizer, 1-6 parts foaming agent, 1-2 parts coupling agent, 5-10 parts processing aid, and 1-4 parts lubricant; wherein the stabilizing agent includes β-diketone, phosphite compounds, and light stabilizer.
2. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, The mass ratio of the β-diketone, phosphite compound, and light stabilizer is 1:(2-4):(0.1-0.3).
3. The high-stability PVC wood-plastic composite material as described in claim 2, characterized in that, The phosphite compounds include triethyl triphenylphosphate, tris(2,4-dichlorophenoxy) phosphate, and isopropyl triphenylphosphate in a mass ratio of 1:(1.7-2.4):(0.8-1.2).
4. The high-stability PVC wood-plastic composite material as described in claim 2, characterized in that, The light stabilizer comprises light stabilizer HPT, ascorbate palmitate, light stabilizer 770, and AM-101 in a mass ratio of 1:(0.7-1.3):(2-2.5):(0.3-0.6).
5. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, It also includes 5-10 parts of maleic anhydride-grafted polyethylene or maleic anhydride-grafted polyvinyl chloride.
6. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, The stabilizer is a mixture of calcium stearate, zinc stearate, and magnesium stearate.
7. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, The foaming agent is azodicarbonamide.
8. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, The coupling agent is a titanate or an aluminate.
9. The high-stability PVC wood-plastic composite material as described in claim 1, characterized in that, The lubricant is paraffin wax or silicone oil.
10. The method for preparing the highly stable PVC wood-plastic composite material according to any one of claims 1-9, characterized in that, Specifically, the following steps are included: First, heat the PVC resin to a molten state, stir it evenly, then add wood flour and calcium carbonate, and mix the above components evenly. The stabilizing agent and the stabilizer are mixed evenly separately, and then the mixture is added to the above mixing system. Finally, the foaming agent, coupling agent, processing aid and lubricant are added to the mixing system and stirred to allow them to react. After the reaction is complete, the material is melted, extruded, pressed, pulverized, and sieved to obtain the finished PVC wood-plastic composite material.