CN110591206A - Flame-retardant polyethylene wood-plastic foamed profile and preparation method thereof - Google Patents
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Abstract
The invention discloses a flame-retardant polyethylene wood-plastic foaming section bar which comprises the following raw materials in parts by weight: 30-50 parts of modified polyethylene, 30-40 parts of plant fiber powder, 5-13 parts of expanded graphite, 4-6 parts of a flame retardant, 0.3-0.5 part of ethylene glycol and 2-3 parts of a foaming agent; the modified polyethylene is prepared by the following method: heating 90-100 parts by weight of low-density polyethylene at 110-130 ℃ until the low-density polyethylene is softened, then adding 8-12 parts by weight of acrylonitrile-styrene copolymer and 0.1-0.2 part by weight of dispersing agent, stirring at 130-140 ℃ for 30-40 minutes, then adding 7-9 parts by weight of polyamide acid solution, heating to 240-260 ℃, stirring at the temperature for reaction for 40-60 minutes, finally cooling to room temperature, and extruding for granulation. According to the invention, the polyethylene is subjected to advanced modification, so that the flame retardant property of the section bar is improved, the section bar has very good mechanical property, the preparation method is simple, and the application prospect is very good.
Description
Technical Field
The invention relates to a foaming section bar, in particular to a flame-retardant polyethylene wood-plastic foaming section bar and a preparation method thereof.
Background
The wood-plastic composite material is a novel functional material obtained by compounding a wood material and thermoplastic or thermosetting plastic. The wood-plastic product has the advantages of both plastic and wood, has positive social effect and ecological effect on the aspects of reducing environmental pollution, protecting forest resources and the like, wherein the polyethylene wood-plastic foamed section has the characteristics of moth prevention, termite prevention, water resistance, moisture resistance and heat insulation, and more replaces wood products.
In order to improve safety, flame retardance is an important characteristic of polyethylene wood-plastic foamed profiles, and the existing flame-retardant polyethylene wood-plastic foamed profiles can achieve good flame retardance but usually sacrifice mechanical properties, so that researches on polyethylene wood-plastic foamed profiles capable of ensuring both mechanical properties and flame retardance become a current hotspot.
Disclosure of Invention
The invention aims to solve the technical problem of providing a flame-retardant polyethylene wood-plastic foaming section capable of simultaneously ensuring mechanical property and flame retardant property and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the flame-retardant polyethylene wood-plastic foaming section comprises the following raw materials in parts by weight: 30-50 parts of modified polyethylene, 30-40 parts of plant fiber powder, 5-13 parts of expanded graphite, 4-6 parts of a flame retardant, 0.3-0.5 part of ethylene glycol and 2-3 parts of a foaming agent;
the modified polyethylene is prepared by the following method: heating 90-100 parts by weight of low-density polyethylene at 120-130 ℃ until the low-density polyethylene is softened, then adding 8-12 parts by weight of acrylonitrile-styrene copolymer and 0.1-0.2 part by weight of dispersing agent, stirring at 130-140 ℃ for 30-40 minutes, then adding 7-9 parts by weight of polyamide acid solution, heating to 240-260 ℃, stirring at the temperature for reaction for 40-60 minutes, finally cooling to room temperature, and extruding for granulation.
Further, the flame retardant is aluminum silicate with the particle fineness of 250-350 meshes. In the process of implementing the invention, the inventor finds that the aluminum silicate flame retardant with the particle fineness of 250-350 meshes is adopted, and the prepared product has the best comprehensive performance of flame retardance and mechanics.
Further, the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent which are mixed according to a ratio of 0.2-0.4: 1. In the implementation process of the invention, the inventor finds that the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent in a ratio of 0.2-0.4: 1, and the prepared product has the best comprehensive performance of flame retardance and mechanics.
Further, the dispersing agent is methyl hydroxypropyl cellulose. In the process of implementing the invention, the inventor finds that the methyl hydroxypropyl cellulose can not only play a role in dispersing, but also improve the mechanical property of the product.
The preparation method of the flame-retardant polyethylene wood-plastic foaming section comprises the following steps:
(1) stirring and mixing the modified polyethylene and the plant fiber powder uniformly at the temperature of 115-125 ℃;
(2) adding expanded graphite, a flame retardant, ethylene glycol and a foaming agent into the uniformly mixed modified polyethylene and plant fiber powder, stirring and mixing for 15-25 minutes at the temperature of 115-125 ℃, and then stirring and cooling to 35-65 ℃ to obtain a premix;
(3) carrying out melt compounding on the premix at the temperature of 225-265 ℃ to obtain a raw material melt;
(4) conveying the raw material melt into a double-screw granulator for granulation, and cooling to obtain final mixed material particles;
(5) and (3) putting the final mixed material particles into a parallel double-screw extruder, extruding and molding at the temperature of 135-165 ℃, and naturally cooling to room temperature after length fixing and slitting to obtain the flame-retardant polyethylene wood-plastic foamed section.
The invention has the beneficial effects that:
according to the invention, the polyethylene is subjected to advanced modification, so that the flame retardant property of the section bar is improved, the section bar has very good mechanical property, the preparation method is simple, and the polyethylene modified flame retardant section bar is suitable for large-scale production and has very good application prospect.
Detailed Description
The invention is further described below with reference to the following examples:
the various starting materials used in the following examples are all commercially available products known in the art unless otherwise specified.
Example 1
Preparation of flame-retardant polyethylene wood-plastic foaming section bar
The flame-retardant polyethylene wood-plastic foamed profile comprises the following raw materials in parts by weight: 40 parts of modified polyethylene, 35 parts of plant fiber powder, 9 parts of expanded graphite, 5 parts of flame retardant, 0.4 part of ethylene glycol and 2.5 parts of foaming agent; the flame retardant is aluminum silicate with the particle fineness of 250-350 meshes, and the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent in a ratio of 0.3: 1; the preparation method comprises the following steps:
(1) heating 95 parts by weight of low-density polyethylene to be softened at the temperature of 120 ℃, then adding 10 parts by weight of acrylonitrile-styrene copolymer and 0.15 part by weight of methylhydroxypropylcellulose, stirring for 35 minutes at the temperature of 135 ℃, then adding 8 parts by weight of polyamic acid solution, heating to 250 ℃, stirring and reacting for 50 minutes at the temperature, finally cooling to room temperature, and extruding and granulating to obtain modified polyethylene;
(2) stirring and mixing the modified polyethylene and the plant fiber powder uniformly at the temperature of 120 ℃;
(3) adding expanded graphite, a flame retardant, ethylene glycol and a foaming agent into the uniformly mixed modified polyethylene and plant fiber powder, stirring and mixing for 20 minutes at the temperature of 120 ℃, and then stirring and cooling to 50 ℃ to obtain a premix;
(4) carrying out melt compounding on the premix at the temperature of 245 ℃ to obtain a raw material melt;
(5) conveying the raw material melt into a double-screw granulator for granulation, and cooling to obtain final mixed material particles;
(6) and (3) putting the final mixed material particles into a parallel double-screw extruder, extruding and molding at the temperature of 140 ℃, and naturally cooling to room temperature after length fixing and slitting to obtain the flame-retardant polyethylene wood-plastic foamed section.
Example 2
Preparation of flame-retardant polyethylene wood-plastic foaming section bar
The flame-retardant polyethylene wood-plastic foamed profile comprises the following raw materials in parts by weight: 30 parts of modified polyethylene, 30 parts of plant fiber powder, 5 parts of expanded graphite, 4 parts of flame retardant, 0.3 part of ethylene glycol and 2 parts of foaming agent; the flame retardant is aluminum silicate with the particle fineness of 250-350 meshes, and the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent in a ratio of 0.2: 1; the preparation method comprises the following steps:
(1) heating 90 parts by weight of low-density polyethylene at 125 ℃ to soften, then adding 8 parts by weight of acrylonitrile-styrene copolymer and 0.1 part by weight of methyl hydroxypropyl cellulose, stirring at 130 ℃ for 40 minutes, then adding 7 parts by weight of polyamic acid solution, heating to 240 ℃, stirring at the temperature for reaction for 60 minutes, finally cooling to room temperature, and extruding and granulating to obtain modified polyethylene;
(2) stirring and mixing the modified polyethylene and the plant fiber powder uniformly at the temperature of 125 ℃;
(3) adding expanded graphite, a flame retardant, ethylene glycol and a foaming agent into the uniformly mixed modified polyethylene and plant fiber powder, stirring and mixing for 25 minutes at the temperature of 115 ℃, and then stirring and cooling to 65 ℃ to obtain a premix;
(4) carrying out melt compounding on the premix at the temperature of 225 ℃ to obtain a raw material melt;
(5) conveying the raw material melt into a double-screw granulator for granulation, and cooling to obtain final mixed material particles;
(6) and (3) putting the final mixed material particles into a parallel double-screw extruder, extruding and molding at the temperature of 135 ℃, and naturally cooling to room temperature after length fixing and slitting to obtain the flame-retardant polyethylene wood-plastic foamed section.
Example 3
Preparation of flame-retardant polyethylene wood-plastic foaming section bar
The flame-retardant polyethylene wood-plastic foamed profile comprises the following raw materials in parts by weight: 50 parts of modified polyethylene, 40 parts of plant fiber powder, 13 parts of expanded graphite, 6 parts of flame retardant, 0.5 part of ethylene glycol and 3 parts of foaming agent; the flame retardant is aluminum silicate with the particle fineness of 250-350 meshes, and the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent in a ratio of 0.4: 1; the preparation method comprises the following steps:
(1) heating 100 parts by weight of low-density polyethylene at 130 ℃ to soften, then adding 12 parts by weight of acrylonitrile-styrene copolymer and 0.2 part by weight of methylhydroxypropylcellulose, stirring at 140 ℃ for 30 minutes, then adding 9 parts by weight of polyamic acid solution, heating to 260 ℃ and stirring at the temperature for reaction for 40 minutes, finally cooling to room temperature, and extruding and granulating to obtain modified polyethylene;
(2) stirring and mixing the modified polyethylene and the plant fiber powder uniformly at the temperature of 115 ℃;
(3) adding expanded graphite, a flame retardant, ethylene glycol and a foaming agent into the uniformly mixed modified polyethylene and plant fiber powder, stirring and mixing for 15 minutes at the temperature of 125 ℃, and then stirring and cooling to 35 ℃ to obtain a premix;
(4) carrying out melt compounding on the premix at the temperature of 265 ℃ to obtain a raw material melt;
(5) conveying the raw material melt into a double-screw granulator for granulation, and cooling to obtain final mixed material particles;
(6) and (3) putting the final mixed material particles into a parallel double-screw extruder, extruding and molding at 165 ℃, and naturally cooling to room temperature after length fixing and slitting to obtain the flame-retardant polyethylene wood-plastic foamed section.
Example 4
Performance test of flame-retardant polyethylene wood-plastic foaming section bar
The flame-retardant expanded polystyrene profiles obtained in examples 1 to 3 were subjected to a performance test according to the national standard, and the results are shown in table 1:
TABLE 1
| Item | Example 1 | Example 2 | Example 3 |
| Density (g/cm)3) | 0.87 | 0.86 | 0.83 |
| Oxygen index (%) | 41 | 39 | 37 |
| Tensile strength (Mpa) | 17.9 | 17.6 | 16.9 |
| Flexural strength (Mpa) | 24.4 | 23.5 | 23.9 |
| Modulus of elasticity (MPa) | 3424 | 3390 | 3457 |
| Impact strength (KJ/m)2) | 13.8 | 13.1 | 14.2 |
Note: the tensile strength test standard is GB/T1040-; the bending strength and the bending modulus test standard are GB/T9341-2000; the unnotched impact strength test standard is GB/T1842-1996.
As can be seen from Table 1, the flame retardant coating composition has not only a very good flame retardant effect, but also excellent mechanical properties.
Example 5
Influence of low-density polyethylene, acrylonitrile-styrene copolymer and polyamic acid on performance of flame-retardant polyethylene wood-plastic foaming profile
The results are shown in Table 2 below, wherein all acrylonitrile-styrene copolymer, three-fifths acrylonitrile-styrene copolymer and one-fifth acrylonitrile-styrene copolymer are omitted in sequence on the basis of example 1, and are sequentially used as first, second and third control groups, all polyamic acid solution, three-fifths polyamic acid solution and one-fifth polyamic acid solution are omitted in sequence on the basis of example 1, and are sequentially used as fourth, fifth and sixth control groups, low-density polyethylene is replaced by equal-weight high-density polyethylene on the basis of example 1, and the control group is seven.
TABLE 2
As can be seen from Table 2, the main factor for achieving excellent impact strength of the profile is the modification of the acrylonitrile-styrene copolymer and the polyamic acid, and the two have poor effects when used alone, and only when used in combination, the modification can effectively improve the impact strength of the profile, and the modification is not suitable for high-density polyethylene.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (5)
1. The flame-retardant polyethylene wood-plastic foaming section is characterized in that: the composite material comprises the following raw materials in parts by weight: 30-50 parts of modified polyethylene, 30-40 parts of plant fiber powder, 5-13 parts of expanded graphite, 4-6 parts of a flame retardant, 0.3-0.5 part of ethylene glycol and 2-3 parts of a foaming agent;
the modified polyethylene is prepared by the following method: heating 90-100 parts by weight of low-density polyethylene at 120-130 ℃ until the low-density polyethylene is softened, then adding 8-12 parts by weight of acrylonitrile-styrene copolymer and 0.1-0.2 part by weight of dispersing agent, stirring at 130-140 ℃ for 30-40 minutes, then adding 7-9 parts by weight of polyamide acid solution, heating to 240-260 ℃, stirring at the temperature for reaction for 40-60 minutes, finally cooling to room temperature, and extruding for granulation.
2. The flame-retardant polyethylene wood-plastic foamed profile according to claim 1, wherein: the fire retardant is aluminum silicate with the particle fineness of 250-350 meshes.
3. The flame retardant polyethylene wood plastic foamed profile according to claim 1 or 2, wherein: the foaming agent is a mixture of ammonium polyphosphate and ADC foaming agent mixed according to a ratio of 0.2-0.4: 1.
4. The flame retardant polyethylene wood plastic foamed profile according to claim 1 or 2, wherein: the dispersing agent is methyl hydroxypropyl cellulose.
5. The method for preparing the flame-retardant polyethylene wood-plastic foamed profile as claimed in claim 1, 2, 3 or 4, wherein: the method comprises the following steps:
(1) stirring and mixing the modified polyethylene and the plant fiber powder uniformly at the temperature of 115-125 ℃;
(2) adding expanded graphite, a flame retardant, ethylene glycol and a foaming agent into the uniformly mixed modified polyethylene and plant fiber powder, stirring and mixing for 15-25 minutes at the temperature of 115-125 ℃, and then stirring and cooling to 35-65 ℃ to obtain a premix;
(3) carrying out melt compounding on the premix at the temperature of 225-265 ℃ to obtain a raw material melt;
(4) conveying the raw material melt into a double-screw granulator for granulation, and cooling to obtain final mixed material particles;
(5) and (3) putting the final mixed material particles into a parallel double-screw extruder, extruding and molding at the temperature of 135-165 ℃, and naturally cooling to room temperature after length fixing and slitting to obtain the flame-retardant polyethylene wood-plastic foamed section.
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| CN112480590A (en) * | 2020-10-29 | 2021-03-12 | 芜湖亚太通用托盘包装有限公司 | High-performance wood-plastic tray and manufacturing method thereof |
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| CN112480590A (en) * | 2020-10-29 | 2021-03-12 | 芜湖亚太通用托盘包装有限公司 | High-performance wood-plastic tray and manufacturing method thereof |
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Application publication date: 20191220 |
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