阅读说明：本技术 一种编织袋用可膨胀石墨阻燃聚乙烯材料 (Expandable graphite flame-retardant polyethylene material for woven bags ) 是由 潘军 于 2019-09-04 设计创作，主要内容包括：本发明公开了一种编织袋用可膨胀石墨阻燃聚乙烯材料,其原料按重量份包括：聚乙烯100份,阻燃剂15-20份,填料20-30份,抗紫外线剂1-2份,抗氧剂1-2份,相容剂1-3份,交联剂1-1.5份,润滑剂1-3份；其中,阻燃剂为改性可膨胀石墨和三聚氰胺。本发明通过各物质相互配合,具有良好的阻燃性、抗冲击性,拉伸强度好。(The invention discloses an expandable graphite flame-retardant polyethylene material for woven bags, which comprises the following raw materials in parts by weight: 100 parts of polyethylene, 15-20 parts of flame retardant, 20-30 parts of filler, 1-2 parts of ultraviolet resistant agent, 1-2 parts of antioxidant, 1-3 parts of compatilizer, 1-1.5 parts of cross-linking agent and 1-3 parts of lubricant; wherein, the flame retardant is modified expandable graphite and melamine. The flame-retardant rubber composition has good flame retardance, impact resistance and tensile strength by matching of various substances.)

1. An expandable graphite flame-retardant polyethylene material for woven bags is characterized by comprising the following raw materials in parts by weight: 100 parts of polyethylene, 15-20 parts of flame retardant, 20-30 parts of filler, 1-2 parts of ultraviolet resistant agent, 1-2 parts of antioxidant, 1-3 parts of compatilizer, 1-1.5 parts of cross-linking agent and 1-3 parts of lubricant; wherein, the flame retardant is modified expandable graphite and melamine.

2. The expandable graphite flame-retardant polyethylene material for the woven bags according to claim 1, wherein in the preparation process of the modified expandable graphite, the expandable graphite is added into an ethanol solution of gamma-aminopropyltriethoxysilane, the temperature is raised to 60-70 ℃, the heat preservation stirring is carried out for 20-30min, inert gas is introduced, lanthanum acrylate and hydroxyethyl acrylate-phenyl-diethylphosphoramide are added and mixed uniformly, dicumyl peroxide is added, the heat preservation stirring is carried out for 2-3h, then butyl acrylate is dropwise added, the heat preservation stirring is carried out for 4-6h, demulsification, centrifugation, washing, precipitation and drying are carried out to obtain the modified expandable graphite.

3. The expandable graphite flame-retardant polyethylene material for woven bags as claimed in claim 2, wherein in the preparation process of the modified expandable graphite, the heat preservation and stirring are carried out at the speed of 1000-.

4. The expandable graphite flame-retardant polyethylene material for the woven bags according to claim 2 or 3, wherein the butyl acrylate is added dropwise within 1 h.

5. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 2 to 4, wherein the weight ratio of expandable graphite to gamma-aminopropyltriethoxysilane is 100: 3-5.

6. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 2 to 5, wherein the weight ratio of expandable graphite, ethanol, lanthanum acrylate, hydroxyethyl acrylate-phenyl-diethylphosphoramide, dicumyl peroxide and butyl acrylate is 10-15: 100-200: 1-2: 15-20: 0.1-0.3: 15-20.

7. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 2 to 6, wherein the precipitate is washed with water and ethanol; preferably, the inert gas is nitrogen or argon.

8. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 1 to 7, wherein the weight ratio of the modified expandable graphite to the melamine is 1: 0.8-1.

9. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 1 to 8, wherein the filler is basalt fiber, carbon black, aramid pulp; preferably, the weight ratio of the basalt fibers to the carbon black to the aramid pulp is 1-2: 10-15: 3-5.

10. The expandable graphite flame-retardant polyethylene material for the woven bags according to any one of claims 1 to 9, wherein the ultraviolet resistant agent is an ultraviolet absorber RMB; preferably, the crosslinking agent is dicumyl peroxide; preferably, the antioxidant is antioxidant 1076; preferably, the lubricant is polyethylene wax; preferably, the compatibilizer is a maleic anhydride grafted compatibilizer.

Technical Field

The invention relates to the technical field of woven bags, in particular to an expandable graphite flame-retardant polyethylene material for woven bags.

Background

The materials used for the woven bag include polyethylene, polypropylene and the like. The polyethylene resin is nontoxic and tasteless white powder or particles, has low water absorption rate, and has good chemical stability and electrical insulation property. However, the mechanical properties of polyethylene are general, and the tensile strength is low; the oxidation resistance and the ultraviolet resistance are not high, the polyethylene flame retardance is poor, and molten drops are easily generated in the combustion process, so that potential safety hazards exist in the production and the use of the woven bag.

The flame retardancy and mechanical properties of polyethylene are often increased by the addition of flame retardants and fillers, and in large amounts (about 50 wt%). Expandable graphite is a good flame retardant, which can form a carbon layer during combustion; the expansion absorbs heat to reduce the temperature of the system; acid radical ions in the interlayer are released, dehydration and carbonization are promoted, and free radicals generated by combustion can be combined to interrupt chain reaction, so that the flame retardant effect is achieved.

However, the carbon layer formed by the expandable graphite in the combustion process is in an expanded state, the carbon layer has poor compactness and is easy to damage in heat convection and fall off to form fly ash, the flame retardant property is reduced, the compatibility of the expandable graphite and polyethylene is poor, and a large amount of expandable graphite is added to cause uneven dispersion, so that the mechanical property of polyethylene can be greatly reduced, and the flame retardant property can be further reduced.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides the expandable graphite flame-retardant polyethylene material for the woven bag, and the expandable graphite flame-retardant polyethylene material has good flame retardance, impact resistance and tensile strength through the mutual matching of various substances.

The invention provides an expandable graphite flame-retardant polyethylene material for woven bags, which comprises the following raw materials in parts by weight: 100 parts of polyethylene, 15-20 parts of flame retardant, 20-30 parts of filler, 1-2 parts of ultraviolet resistant agent, 1-2 parts of antioxidant, 1-3 parts of compatilizer, 1-1.5 parts of cross-linking agent and 1-3 parts of lubricant; wherein, the flame retardant is modified expandable graphite and melamine.

Preferably, in the preparation process of the modified expandable graphite, the expandable graphite is added into an ethanol solution of gamma-aminopropyltriethoxysilane, the temperature is raised to 60-70 ℃, the heat preservation and the stirring are carried out for 20-30min, inert gas is introduced, lanthanum acrylate and hydroxyethyl acrylate-phenyl-diethylphosphoramide are added and mixed uniformly, dicumyl peroxide is added, the heat preservation and the stirring are carried out for 2-3h, then butyl acrylate is added dropwise, the heat preservation and the stirring are carried out for 4-6h, the demulsification, the centrifugation, the washing and the precipitation are carried out, and the modified expandable graphite is obtained after the drying.

Preferably, in the preparation process of the modified expandable graphite, the heat preservation and stirring are carried out for 20-30min at the speed of 1000-.

Preferably, the butyl acrylate is added dropwise within 1 h.

Preferably, the weight ratio of expandable graphite to gamma-aminopropyltriethoxysilane is 100: 3-5.

Preferably, the weight ratio of expandable graphite, ethanol, lanthanum acrylate, hydroxyethyl acrylate-phenyl-diethylphosphoramide, dicumyl peroxide and butyl acrylate is 10-15: 100-200: 1-2: 15-20: 0.1-0.3: 15-20.

Preferably, the precipitate is washed with water and ethanol.

Preferably, the inert gas is nitrogen or argon.

Preferably, the weight ratio of the modified expandable graphite to the melamine is 1: 0.8-1.

Preferably, the filler is basalt fiber, carbon black, aramid pulp.

Preferably, the weight ratio of the basalt fibers to the carbon black to the aramid pulp is 1-2: 10-15: 3-5.

Preferably, the anti-uv agent is a uv absorber RMB.

Preferably, the crosslinking agent is dicumyl peroxide.

Preferably, the antioxidant is antioxidant 1076.

Preferably, the lubricant is polyethylene wax.

Preferably, the compatibilizer is a maleic anhydride grafted compatibilizer.

The preparation method comprises the following steps: polyethylene, flame retardant, filler, ultraviolet resistant agent, antioxidant, compatilizer, cross-linking agent and lubricant are blended, melted and extruded into plastic cloth, the plastic cloth is cut into blank wires, and the blank wires are drawn into flat wires for standby.

The invention firstly uses the gamma-aminopropyl triethoxysilane to treat the expandable graphite, improves the dispersibility of the expandable graphite, then mixing with lanthanum acrylate and hydroxyethyl acrylate-phenyl-diethylphosphoramide, copolymerizing lanthanum acrylate and hydroxyethyl acrylate-phenyl-diethylphosphoramide under the action of diisopropylbenzene oxide, and the modified expandable graphite is coated on the surface of the expandable graphite and then copolymerized with butyl acrylate, the molecular weight of the copolymer is increased, the compatibility of the copolymer and polyethylene is improved, and finally the modified expandable graphite is obtained, the dispersibility of the expandable graphite in the polyethylene is greatly improved, and the copolymer contains lanthanum and phosphorus, so that the tensile strength and the impact resistance of the copolymer can be improved, the polyethylene can greatly increase the tensile strength and the impact resistance of the polyethylene and reduce the using amount of the filler by matching with the polyethylene; lanthanum and phosphorus are coated on the surface of the expandable graphite, so that the flame retardant property of the flame retardant is greatly improved, the using amount of a flame retardant is reduced, lanthanum oxide generated in the combustion process can be attached to the surface of a carbon layer formed by the expandable graphite, the compactness of the carbon layer is improved, the generation of 'fly ash' is prevented, and the flame retardant is further realized; the melamine and the modified expandable graphite act synergistically in a proper proportion, so that the flame retardant property of the flame retardant is further improved, and the using amount of the flame retardant is small; basalt fibers, carbon black and aramid fiber poise pulp are selected to be matched with each other in a proper proportion and then are in synergistic action with the modified expandable graphite, so that the tensile strength and the impact resistance of the composite material can be greatly improved, and the using amount of the filler is small; the carbon black, the ultraviolet absorbent RMB and the antioxidant 1076 are matched with each other, so that the ultraviolet resistance and the oxidation resistance of the invention can be improved; the polyethylene wax and the maleic anhydride grafted compatilizer can promote the uniform dispersion of all substances; the flame-retardant rubber composition has good flame retardance, impact resistance and tensile strength by matching the substances.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.