CN116622148A - Flame-retardant polyethylene material, preparation method and simulated Christmas tree - Google Patents
Flame-retardant polyethylene material, preparation method and simulated Christmas tree Download PDFInfo
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- CN116622148A CN116622148A CN202310690536.XA CN202310690536A CN116622148A CN 116622148 A CN116622148 A CN 116622148A CN 202310690536 A CN202310690536 A CN 202310690536A CN 116622148 A CN116622148 A CN 116622148A
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- flame
- polyethylene glycol
- polyethylene
- retardant
- polyethylene material
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000003063 flame retardant Substances 0.000 title claims abstract description 157
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 106
- -1 polyethylene Polymers 0.000 title claims abstract description 106
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 106
- 239000000463 material Substances 0.000 title claims abstract description 93
- 241000191291 Abies alba Species 0.000 title claims description 39
- 238000002360 preparation method Methods 0.000 title description 5
- 229940068918 polyethylene glycol 400 Drugs 0.000 claims abstract description 52
- 239000002245 particle Substances 0.000 claims abstract description 49
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 38
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 38
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 38
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229940057847 polyethylene glycol 600 Drugs 0.000 claims abstract description 26
- BMENBXQCFCSBAQ-UHFFFAOYSA-N sodium;oxido(dioxo)-$l^{5}-stibane Chemical compound [Na+].[O-][Sb](=O)=O BMENBXQCFCSBAQ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 22
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 22
- BZQKBFHEWDPQHD-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-[2-(2,3,4,5,6-pentabromophenyl)ethyl]benzene Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1CCC1=C(Br)C(Br)=C(Br)C(Br)=C1Br BZQKBFHEWDPQHD-UHFFFAOYSA-N 0.000 claims abstract description 19
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims abstract description 18
- LXWPJAGZRHTAOO-UHFFFAOYSA-N [Sb].[Br] Chemical compound [Sb].[Br] LXWPJAGZRHTAOO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 15
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 15
- 239000004094 surface-active agent Substances 0.000 claims abstract description 12
- 238000013329 compounding Methods 0.000 claims abstract description 6
- 239000006096 absorbing agent Substances 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 5
- 239000000314 lubricant Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000007605 air drying Methods 0.000 claims description 12
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 11
- 239000008116 calcium stearate Substances 0.000 claims description 11
- 235000013539 calcium stearate Nutrition 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- RPJGYLSSECYURW-UHFFFAOYSA-K antimony(3+);tribromide Chemical compound Br[Sb](Br)Br RPJGYLSSECYURW-UHFFFAOYSA-K 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 abstract description 34
- 239000012778 molding material Substances 0.000 abstract description 2
- 235000004507 Abies alba Nutrition 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 25
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 19
- 230000000694 effects Effects 0.000 description 18
- NSBGJRFJIJFMGW-UHFFFAOYSA-N trisodium;stiborate Chemical compound [Na+].[Na+].[Na+].[O-][Sb]([O-])([O-])=O NSBGJRFJIJFMGW-UHFFFAOYSA-N 0.000 description 9
- 230000002195 synergetic effect Effects 0.000 description 8
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 6
- 235000011613 Pinus brutia Nutrition 0.000 description 6
- 241000018646 Pinus brutia Species 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- QFFVPLLCYGOFPU-UHFFFAOYSA-N barium chromate Chemical compound [Ba+2].[O-][Cr]([O-])(=O)=O QFFVPLLCYGOFPU-UHFFFAOYSA-N 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47G—HOUSEHOLD OR TABLE EQUIPMENT
- A47G33/00—Religious or ritual equipment in dwelling or for general use
- A47G33/04—Christmas trees
- A47G33/06—Artificial Christmas trees
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of injection molding materials, and discloses a flame-retardant polyethylene material, which comprises, by weight, 80-90 parts of low-density polyethylene, 5-10 parts of linear low-density polyethylene, 2-5 parts of a bromine-antimony flame retardant, 1-3 parts of magnesium hydroxide, 0.5-0.75 part of an antioxidant 1010, 0.5-1.5 parts of a surfactant, 0.2-0.8 part of a lubricant, 0.2-0.8 part of an acid absorber, 0.15-0.2 part of an antioxidant 168 and 0.01-0.5 part of toner; the bromine-antimony flame retardant is formed by compounding decabromodiphenylethane and sodium metaantimonate with the particle diameter D90 of 2-5 mu m, the particle diameter D90 of magnesium hydroxide is less than or equal to 1.5 mu m, and the surfactant is one of polyethylene glycol 400 dilaurate, polyethylene glycol 400 distearate, polyethylene glycol 600 distearate, polyethylene glycol 400 monooleate, polyethylene glycol 400 dioleate, polyethylene glycol 600 monooleate and polyethylene glycol 600 dioleate. The magnesium hydroxide is precipitated on the outer surface of the injection molding product, and the magnesium hydroxide immediately plays a role in flame retardance of the outermost layer when the injection molding product burns, so that the flame retardance is improved.
Description
Technical Field
The invention relates to the technical field of injection molding materials, in particular to a flame-retardant polyethylene material, a preparation method and a simulated Christmas tree.
Background
With the development of the age, the environmental awareness of people is gradually enhanced, and the cutting of trees is strictly controlled.
The production and use of the simulated Christmas tree are changed from the real pine cutting, the important holiday is based on the Western country, and the Christmas tree is an important decoration of the Christmas, so the demand of the simulated Christmas tree is very large, the main material of the current common simulated Christmas tree is PVC or flame-retardant polyethylene, the PVC has good flame-retardant performance, low price and very large demand, but the simulation effect is poor because the PVC is not suitable for injection molding; the flame-retardant polyethylene has good processability, can be used for manufacturing various types of simulated Christmas pine branches with various colors, has excellent flame-retardant property, can be extinguished immediately after being separated from fire, and is popular with European and American buyers.
Chinese patent 201810057030.4 discloses a bromine-antimony flame-retardant polyethylene material, and the invention patent application discloses a flame-retardant low-density polyethylene flame retardant, which comprises the following basic steps: firstly dealkalizing red mud; roasting the dealkalized red mud at 400-800 ℃ and crushing the red mud to 300-500 meshes; modifying the roasted red mud by using a titanate coupling agent to obtain modified red mud; the modified red mud, decabromodiphenyl ethane, antimonous oxide and low-density polyethylene are melt blended, and the mass ratio of each component is as follows: the oxygen index of the low density polyethylene composite material prepared from the low density polyethylene, the modified red mud, the antimony trioxide and the decabromodiphenyl ethane is equal to or more than 30.0 percent, the vertical combustion grade is equal to or more than UL94V-0 grade, and the oxygen index of the low density polyethylene composite material prepared from the modified red mud, the antimony trioxide and the decabromodiphenyl ethane is equal to or more than 75-88 percent, the oxygen index of the low density polyethylene composite material prepared from the modified red mud and the decabromodiphenyl ethane is equal to or more than 1-4 percent, and the oxygen index of the low density polyethylene composite material prepared from the modified red mud is equal to or more than 2.75-5.25 percent.
The special component proportion of the patent enables the flame retardant effect of the polyethylene material to reach UL94V-0 level, is a good flame retardant polyethylene material, but is used for decoration in the room based on the simulation Christmas tree, and if the flame retardant polyethylene material prepared by the patent is used for injection molding of the simulation Christmas tree, the usage amount of substances such as red mud, antimony trioxide and the like has certain pollution, and does not accord with the harsher environmental protection protocol in European and American markets.
The addition of the flame retardant in the general flame-retardant polyethylene material accounts for 10-30%, so that the content of polluting impurities such as lead, arsenic and other elements in the flame-retardant polyethylene material exceeds the content specified by European and American market environmental protection protocols (the content of lead and arsenic is lower than 5 ppm), and the addition of the flame retardant also reduces the performances such as elongation at break, fluidity and the like of the flame-retardant polyethylene material; if the consumption of the flame retardant is reduced, the environment-friendly protocol can be regulated, the performance of the flame-retardant polyethylene can be effectively improved, but after the consumption of the flame retardant is reduced, the flame-retardant performance of the polyethylene material can be reduced, and particularly when the flame-retardant polyethylene material is used for producing indoor decorations such as simulated Christmas trees, the flame-retardant performance is an index of attention of European and American markets.
Therefore, it is necessary to develop a flame retardant polyethylene material which has high flame retardant property and is environment-friendly and is used for injection molding of the simulated Christmas tree.
Disclosure of Invention
The invention aims to provide a flame-retardant polyethylene material which has high flame-retardant performance, good elongation at break, good fluidity and other performance, environmental protection and high market prospect.
The invention further aims to provide a preparation method of the flame-retardant polyethylene material, and the flame-retardant polyethylene material prepared by the method has high flame retardance, high toughness and high fluidity and has good application prospect.
Meanwhile, the invention also provides a simulated Christmas tree which has high simulation degree, meets the environmental protection requirement, and has higher flame retardance and high safety.
In order to achieve the aim, the invention provides a flame-retardant polyethylene material which comprises the following components in parts by weight:
wherein the bromine-antimony flame retardant is formed by compounding decabromodiphenylethane and sodium metaantimonate with the particle diameter D90 of 2-5 mu m, and the particle diameter D90 of magnesium hydroxide is less than or equal to 1.5 mu m; the surfactant is one of polyethylene glycol 400 dilaurate, polyethylene glycol 400 distearate, polyethylene glycol 600 distearate, polyethylene glycol 400 monooleate, polyethylene glycol 400 dioleate, polyethylene glycol 600 monooleate and polyethylene glycol 600 dioleate.
Preferably, the weight ratio of the decabromodiphenylethane to the sodium metaantimonate is 1-5:1.
preferably, the low density polyethylene has a melt index of 60g/10min.
Preferably, the linear low density polyethylene has a melt index of 20g/10min.
Preferably, the weight ratio of the antioxidant 168 to the antioxidant 1010 is 1:3-4.
Preferably, the lubricant is polyethylene wax and the acid absorber is calcium stearate.
Preferably, the weight part of polyethylene glycol 400 dilaurate in the surfactant is 0.2-0.3 part.
Preferably, the toner comprises one or more of phthalocyanine green, permanent yellow, phthalocyanine blue, titanium yellow, titanium white and carbon black.
The invention also provides a preparation method of the flame-retardant polyethylene material, which comprises the following steps:
step 1: mixing low density polyethylene, linear low density polyethylene, antimony bromide flame retardant, lubricant, acid absorber, antioxidant 168, magnesium hydroxide, antioxidant 1010 and toner to form a mixture;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding a liquid surfactant into the double-screw extruder from an exhaust port through a weightless liquid feeder, and extruding the mixture in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the flame-retardant polyethylene material.
Preferably, the extrusion temperature of the twin-screw extruder in the step 2 is 160-175 ℃ and the vacuum degree is < -0.8MPa.
The invention also provides a simulated Christmas tree which is obtained by adopting the flame-retardant polyethylene material for injection molding.
Advantageous effects
Compared with the prior art, the invention has at least the following advantages:
(1) According to the invention, by utilizing the characteristic that polyethylene glycol 400 dilaurate can bring out tiny particles to be precipitated on the outer surface of an injection molding product during injection molding, the outer surface of an injection molded simulated Christmas tree is provided with magnesium hydroxide particles with the D90 less than or equal to 1.5 mu m, the magnesium hydroxide is precipitated on the outer surface of the injection molding product, and when the injection molding product burns, the magnesium hydroxide immediately plays the most superficial flame retardant role, so that the flame retardant property is improved;
the flame-retardant mechanism of the magnesium hydroxide is that the magnesium hydroxide is decomposed to absorb heat on the surface of a combustion object to realize flame-retardant effect when heated, and simultaneously releases a large amount of oxygen for diluting the surface of the combustion object, and the active magnesium oxide generated by decomposition is attached to the surface of the combustion object to further prevent the combustion; therefore, the particle distribution of magnesium hydroxide in the injection molding product has an influence on the flame retardant property, and magnesium hydroxide particles with small particle size are brought out by the antioxidant 1010 during precipitation, so that the magnesium hydroxide particles are distributed on the surface layer of the injection molding product, and the optimal flame retardant effect is achieved;
(2) According to the invention, polyethylene glycol 400 dilaurate and other specific surfactants are compounded for use, so that the carried magnesium hydroxide particles are more uniformly distributed on the outer surface of an injection molding product, and the phenomenon that the polyethylene glycol 400 dilaurate carries other substances to the outer surface of the injection molding product to influence the flame retardant property and mechanical property of the injection molding product is avoided;
(3) According to the invention, by utilizing the characteristic that a large dose of antioxidant 1010 is partially precipitated on the outer surface of an injection molding product during injection molding and the characteristic that tiny particle substances are precipitated on the outer surface of the injection molding product during injection molding by matching with polyethylene glycol 400 dilaurate, the antioxidant 1010 and magnesium hydroxide with smaller particle size are preferentially precipitated during injection molding of the polyethylene glycol 400 dilaurate, and the reduction of the synergistic flame retardant effect of bromine and antimony caused by the complete precipitation of sodium antimonate with larger particle size on the outer surface of the injection molding product is avoided; meanwhile, the dosage of the antioxidant 1010 is controlled in a proper range, so that the influence on the mechanical properties of the simulated Christmas tree caused by excessive antioxidant 1010 is avoided;
(4) According to the invention, sodium meta-antimonate with the particle size D90 of 2-5 mu m is adopted as a synergistic flame retardant component of the brominated flame retardant, on one hand, because the sodium meta-antimonate with the particle size D90 of less than 5 mu m has better dispersibility, the synergistic flame retardant effect is effectively improved; on the other hand, the particle size is required to be slightly larger than 1.5 mu m, so that partial polyethylene glycol 400 dilaurate can be prevented from bringing sodium antimonate particles out of the outer surface of an injection molding product during injection molding, and the synergistic flame retardant effect of sodium antimonate and decabromodiphenylethane is reduced;
(5) According to the invention, a high flame retardant effect can be achieved by only adding a small amount of flame retardant, and the polyethylene material retains high physical properties, so that the injection-molded simulated Christmas tree retains enough toughness, and the market competitiveness is improved.
Detailed Description
The invention is further described below in connection with the examples, which are not to be construed as limiting the invention in any way, but rather as a limited number of modifications which are within the scope of the appended claims.
In order to explain the technical content of the present invention in detail, the following description will further explain the embodiments.
In this example and comparative example, the melt index of the low density polyethylene was 60g/10min, and the melt index of the linear low density polyethylene was 20g/10min, and all the components used were commercially available products unless otherwise specified.
In the embodiment and the comparative example, the water cooling process is to cool the strip-shaped flame-retardant polyethylene material to 35 ℃ or below by water with the temperature lower than 35 ℃, the air drying process only needs to blow the moisture on the surface of the strip-shaped flame-retardant polyethylene material to dry, and the granulating process is to granulate the strip-shaped flame-retardant polyethylene material into cylinders with the length of 3-5mm and the diameter of 2-4 mm; the above steps are all prior art, and the effect achieved by the steps can be achieved by other steps or processes, and are not technical problems to be solved by the present invention, and therefore, the present invention is not deeply expressed or limited.
Example 1
The flame-retardant polyethylene material is prepared by the following steps:
step 1: 80 parts of low-density polyethylene, 10 parts of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 3 parts of decabromodiphenyl ethane and 1 part of sodium metaantimonate with the particle size D90 of 2 mu m, 0.2 part of polyethylene wax, 0.2 part of calcium stearate, 0.15 part of antioxidant 168, 1 part of magnesium hydroxide with the particle size D90 of 1.5 mu m, 0.5 part of antioxidant 1010 and 0.01 part of toner are mixed to form a mixture A;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding 0.4 part of polyethylene glycol 400 dilaurate and 0.1 part of polyethylene glycol 600 distearate into the double-screw extruder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 160 ℃, and the vacuum degree of the double-screw extruder is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 2
The flame-retardant polyethylene material is prepared by the following steps:
step 1: 80 parts of low-density polyethylene, 10 parts of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 3 parts of decabromodiphenyl ethane and 1 part of sodium metaantimonate with the particle size D90 of 2 mu m, 0.2 part of polyethylene wax, 0.2 part of calcium stearate, 0.15 part of antioxidant 168, 1 part of magnesium hydroxide with the particle size D90 of 1.5 mu m, 0.5 part of antioxidant 1010 and 0.01 part of toner are mixed to form a mixture A;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding 0.2 part of polyethylene glycol 400 dilaurate and 0.3 part of polyethylene glycol 600 distearate into the double-screw extruder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 160 ℃, and the vacuum degree of the double-screw extruder is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 3
The flame-retardant polyethylene material is prepared by the following steps:
step 1: 80 parts of low-density polyethylene, 10 parts of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 3 parts of decabromodiphenyl ethane and 1 part of sodium metaantimonate with the particle size D90 of 2 mu m, 0.2 part of polyethylene wax, 0.2 part of calcium stearate, 0.15 part of antioxidant 168, 1 part of magnesium hydroxide with the particle size D90 of 1.5 mu m, 0.5 part of antioxidant 1010 and 0.01 part of toner are mixed to form a mixture A;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding 0.3 part of polyethylene glycol 400 dilaurate and 1.2 parts of polyethylene glycol 600 distearate into the double-screw extruder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 160 ℃, and the vacuum degree of the double-screw extruder is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 4
The flame-retardant polyethylene material is prepared by the following steps:
step 1: 80 parts of low-density polyethylene, 10 parts of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 3 parts of decabromodiphenyl ethane and 1 part of sodium metaantimonate with the particle size D90 of 5 mu m, 0.2 part of polyethylene wax, 0.2 part of calcium stearate, 0.15 part of antioxidant 168, 1 part of magnesium hydroxide with the particle size D90 of 1 mu m, 0.5 part of antioxidant 1010 and 0.01 part of toner are mixed to form a mixture;
step 2: adding the mixture from a blanking head of a double-screw extruder into the double-screw extruder, adding 0.25 part of polyethylene glycol 400 dilaurate and 0.75 part of polyethylene glycol 600 dioleate into the double-screw extruder through a weightless liquid feeder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 dioleate in the double-screw extruder after mixing to obtain a strip flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 165 ℃ and the vacuum degree is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 5
The flame-retardant polyethylene material is prepared by the following steps:
step 1: 90 parts of low-density polyethylene, 5 parts of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 4 parts of decabromodiphenyl ethane and 1 part of sodium metaantimonate with the particle size D90 of 5 mu m, 0.6 part of polyethylene wax, 0.5 part of calcium stearate, 0.2 part of antioxidant 168, 3 parts of magnesium hydroxide with the particle size D90 of 1.3 mu m, 0.75 part of antioxidant 1010 and 0.5 part of toner are mixed to form a mixture;
step 2: adding the mixture A into a double-screw extruder from a blanking head of the double-screw extruder, adding 0.3 part of polyethylene glycol 400 dilaurate and 1.2 parts of polyethylene glycol 400 monooleate into the double-screw extruder from an exhaust port of the double-screw extruder through a weightless liquid feeder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 400 monooleate in the double-screw extruder after mixing to obtain a strip flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 175 ℃ and the vacuum degree is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 6
The flame-retardant polyethylene material is prepared by the following steps:
step 1: according to the weight portion, 85 portions of low-density polyethylene, 8 portions of linear low-density polyethylene, a bromine-antimony flame retardant formed by compounding 4 portions of decabromodiphenyl ethane and 1 portion of sodium metaantimonate with the grain diameter D90 of 3 mu m, 0.6 portion of polyethylene wax, 0.5 portion of calcium stearate, 0.2 portion of antioxidant 168, 2 portions of magnesium hydroxide with the grain diameter D90 of 1.5 mu m, 0.75 portion of antioxidant 1010 and 0.5 portion of toner are mixed to form a mixture;
step 2: adding the mixture from a blanking head of a double-screw extruder into the double-screw extruder, adding 0.25 part of polyethylene glycol 400 dilaurate and 0.75 part of polyethylene glycol 600 distearate into the double-screw extruder through a weightless liquid feeder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 165 ℃ and the vacuum degree is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Example 7
Substantially the same as in example 6, except that the antioxidant 168 was 0.15 parts by weight.
Comparative example 1
Substantially the same as in example 6, except that the sodium meta-antimonate having a particle diameter D90 of 3 μm was replaced with antimony trioxide having a particle diameter D90 of 3. Mu.m.
Comparative example 2
Substantially the same as in example 6, except that the particle diameter D90 of the magnesium hydroxide was 2. Mu.m.
Comparative example 3
Substantially the same as in example 6, except that the antioxidant 1010 was replaced with an equivalent weight part of the antioxidant 168.
Comparative example 4
The procedure is substantially as in example 6, except that the particle diameter D90 of sodium antimonate is 7. Mu.m.
Comparative example 5
The procedure is substantially as in example 6, except that the particle diameter D90 of sodium antimonate is 1. Mu.m.
Comparative example 6
The flame-retardant polyethylene material is prepared by the following steps:
step 1: according to the weight portion, 85 portions of low-density polyethylene, 8 portions of linear low-density polyethylene, a bromine-antimony flame retardant compounded by 12 portions of decabromodiphenyl ethane and 3 portions of sodium metaantimonate with the grain diameter D90 of 3 mu m, 0.6 portion of polyethylene wax, 0.5 portion of calcium stearate, 0.2 portion of antioxidant 168, 0.75 portion of antioxidant 1010 and 0.5 portion of toner are mixed to form a mixture;
step 2: adding the mixture from a blanking head of a double-screw extruder into the double-screw extruder, adding 0.25 part of polyethylene glycol 400 dilaurate and 0.75 part of polyethylene glycol 600 distearate into the double-screw extruder through a weightless liquid feeder from an exhaust port of the double-screw extruder, and extruding the mixture, the polyethylene glycol 400 dilaurate and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 165 ℃ and the vacuum degree is-0.7 MPa;
step 4: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Comparative example 7
The flame-retardant polyethylene material is prepared by the following steps:
step 1: according to the weight portion, 85 portions of low-density polyethylene, 8 portions of linear low-density polyethylene, a bromine-antimony flame retardant formed by compounding 4 portions of decabromodiphenyl ethane and 1 portion of sodium metaantimonate with the grain diameter D90 of 3 mu m, 0.6 portion of polyethylene wax, 0.5 portion of calcium stearate, 0.2 portion of antioxidant 168, 2 portions of magnesium hydroxide with the grain diameter D90 of 1.5 mu m, 0.75 portion of antioxidant 1010 and 0.5 portion of toner are mixed to form a mixture;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding 1 part of polyethylene glycol 400 dilaurate into the double-screw extruder from an exhaust port of the double-screw extruder through a weightless liquid feeder, and extruding the mixture and the polyethylene glycol 400 dilaurate in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 165 ℃, and the vacuum degree is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Comparative example 8
The flame-retardant polyethylene material is prepared by the following steps:
step 1: according to the weight portion, 85 portions of low-density polyethylene, 8 portions of linear low-density polyethylene, a bromine-antimony flame retardant formed by compounding 4 portions of decabromodiphenyl ethane and 1 portion of sodium metaantimonate with the grain diameter D90 of 3 mu m, 0.6 portion of polyethylene wax, 0.5 portion of calcium stearate, 0.2 portion of antioxidant 168, 2 portions of magnesium hydroxide with the grain diameter D90 of 1.5 mu m, 0.75 portion of antioxidant 1010 and 0.5 portion of toner are mixed to form a mixture;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding 1 part of polyethylene glycol 600 distearate into the double-screw extruder from an exhaust port of the double-screw extruder through a weightless liquid feeder, and extruding the mixture and the polyethylene glycol 600 distearate in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material, wherein the extrusion temperature of the double-screw extruder is 165 ℃, and the vacuum degree is-0.7 MPa;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the cylindrical flame-retardant polyethylene material.
Comparative example 9
Substantially the same as in example 6, except that the antioxidant 1010 in the above-mentioned step 1 was 0.3 part by weight.
Comparative example 10
Substantially the same as in example 6, except that the antioxidant 1010 in the above-mentioned step 1 was 1 part by weight.
Performance testing
The flame-retardant polyethylene materials obtained in examples 1-4 and comparative examples 1-6 were subjected to injection molding by a horizontal injection molding machine to obtain simulated Christmas tree branch samples, and the molding process conditions were as follows: the injection temperature was 270 ℃; the injection pressure is 150MPa; dwell time 3s; cooling time was 5s.
The performance test criteria are as follows:
melt index: testing (190 ℃ C./2.16 Kg) according to ASTM D-1238;
elongation at break: testing according to ASTM D-638;
notched Izod impact Strength: testing according to ASTM D-256;
flame retardant test: directly igniting the head of the simulated Christmas tree branch sample by using the alcohol lamp for 10 seconds, removing the alcohol lamp, simultaneously reading for seconds, and calculating how much time later the simulated Christmas tree branch sample can be self-extinguished;
the performance test results are shown in table 1:
TABLE 1 results of Performance test of examples 1-7 and comparative examples 1-10
According to the results of example 6 and comparative example 1, the replacement of sodium metaantimonate with equal amount of antimony trioxide does not greatly affect the mechanical properties and flame retardant properties of the flame retardant polyethylene material, but the use of antimony trioxide as a synergistic flame retardant easily exceeds the environmental protection protocol of severe Europe and America because the sodium metaantimonate has lower cost and the lead content and the arsenic content in the antimony trioxide are both more than 500ppm, so that the European and America market simulating Christmas trees is hindered, and therefore, the technical scheme of the invention does not consider the use of antimony trioxide as the synergistic flame retardant in the bromine antimony trioxide flame retardant.
According to the results of example 6 and comparative example 2, it is known that the use of magnesium hydroxide having a particle diameter D90 of more than 1.5 μm causes that polyethylene glycol 400 dilaurate cannot bring out magnesium hydroxide during the process of separating out the outer surface when injection molding into simulated christmas tree branches, resulting in a great reduction in the flame retardant effect of magnesium hydroxide, thereby reducing the flame retardant property of simulated christmas tree branches.
According to the results of the embodiment 6 and the comparative example 3, the invention can achieve the effect of cooperatively protecting the flame-retardant polyethylene material by adopting the antioxidant 1010 and the antioxidant 168, and maintain the mechanical property of the flame-retardant polyethylene material, and can also partially separate out the characteristic of the outer surface of the simulated Christmas tree branch through a large amount of the antioxidant 1010 to separate out the outer surface of the simulated Christmas tree branch along with the polyethylene glycol 400 dilaurate, so as to jointly carry out magnesium hydroxide particles, and simultaneously effectively inhibit the accompanying separation of sodium antimonate with larger particle size as the preferable item accompanying the polyethylene glycol 400 dilaurate to avoid the reduction of the flame-retardant effect caused by uneven dispersion of sodium antimonate.
As is clear from the results of example 6 and comparative example 4, the too large particle size of sodium meta-antimonate affects the dispersibility of sodium meta-antimonate particles and also affects the flame retardant property, and the flame retardant properties of the head and the root of the branch of the simulated Christmas tree are obviously different due to the uneven dispersion of sodium meta-antimonate particles.
According to the results of example 6 and comparative example 5, the precipitation of polyethylene glycol 400 dilaurate and partial antioxidant 1010 in the injection molding process also brings sodium antimonate with D90 of 1 μm, so that the sodium antimonate and decabromodiphenylethane are unevenly distributed, the synergistic flame retardant effect is reduced, the flame retardant property of the flame retardant polyethylene material is reduced, and the flame retardant properties of the head and the root of the simulated Christmas tree branch are obviously different.
According to the results of example 6 and comparative example 6, although increasing the weight part of the bromine-antimony flame retardant can improve the flame retardant property, the mechanical property of the relative flame retardant polyethylene material is also greatly reduced, and important performance indexes such as toughness of injection molding products are affected, so that the market competitiveness of the manufactured simulated Christmas tree is reduced; meanwhile, compared with the technical scheme of the invention, the technical scheme of the comparative example 6 does not have magnesium hydroxide particles distributed on the outer surface of the branch of the simulated Christmas tree to effectively prevent flame, so that the self-extinguishing time after ignition is prolonged.
From the results of example 6 and comparative example 7, it is understood that the mere use of polyethylene glycol 400 dilaurate as a surfactant resulted in the precipitation of a majority of polyethylene glycol 400 dilaurate, antioxidant 1010 and magnesium hydroxide particles at the head of the branch of the simulated christmas tree with a smaller diameter during injection molding; the reason may be that during the injection molding process, the simulated Christmas pine branch is used for preferentially completing the injection molding of the head, and the middle part is injected finally, so that the head is cooled preferentially, and the surfactant can form a surface active layer at the head surface position more easily. The polyethylene glycol 600 distearate and the polyethylene glycol 400 dilaurate are mixed, so that most of the polyethylene glycol 400 distearate, the antioxidant 1010 and the magnesium hydroxide particles are not separated out to the head of the simulated Christmas pine branch, but are separated out uniformly on the outer surface of the whole simulated Christmas pine branch, and the reason is probably that the polyethylene glycol 600 distearate delays the separation speed of the polyethylene glycol 400 distearate, so that the influence of the cooling path of the simulated Christmas pine branch on the separation of the polyethylene glycol 400 distearate is reduced, and finally the separation position of the polyethylene glycol 400 distearate is more uniform.
According to the results of example 6 and comparative example 8, the polyethylene glycol 600 distearate alone cannot be precipitated on the outer surface of the simulated Christmas tree branch during injection molding, so that the antioxidant 1010 and the magnesium hydroxide particles cannot be carried out, the flame retardant effect of the magnesium hydroxide particles is greatly reduced, and the flame retardant property of the simulated Christmas tree branch is reduced.
From the results of example 6 and comparative example 9, it is apparent that since a small dose of antioxidant 1010 is difficult to precipitate along with polyethylene glycol 400 dilaurate to the outer surface of the simulated Christmas tree branch, a part of sodium meta-antimonate particles are taken out of the outer surface of the simulated Christmas tree branch by polyethylene glycol 400 dilaurate as a sub-option, so that the distribution of the sodium meta-antimonate particles is uneven, the synergistic flame retardant effect of the bromine-antimony flame retardant is reduced, and the overall flame retardant performance of the simulated Christmas tree branch is affected.
From the results of example 6 and comparative example 10, it is understood that, although a large amount of antioxidant 1010 does not have a great influence on the precipitation effect of polyethylene glycol 400 dilaurate and magnesium hydroxide particles, the mechanical properties of the simulated Christmas tree branches are affected due to the excessive amount of antioxidant 1010.
In summary, the technical scheme of the invention adopts reasonable surfactant matching and antioxidant 1010 selection, so that the flame retardant effect of magnesium hydroxide and bromine-antimony flame retardant is maximized, the flame retardant property of the simulated Christmas tree is effectively enhanced, the consumption of the flame retardant is reduced, and the mechanical property of the simulated Christmas tree is effectively improved; in addition, the invention adopts reasonable dosages and proportions of the antioxidant 1010 and the antioxidant 168, so that the mechanical property of the simulated Christmas tree can be kept in a better range.
The embodiments presented herein are merely implementations selected from combinations of all possible embodiments. The following claims should not be limited to the description of the embodiments of the invention. Some numerical ranges used in the claims include sub-ranges within which variations in these ranges are also intended to be covered by the appended claims.
Claims (9)
1. The flame-retardant polyethylene material is characterized by comprising the following components in parts by weight:
wherein the bromine-antimony flame retardant is formed by compounding decabromodiphenylethane and sodium metaantimonate with the particle diameter D90 of 2-5 mu m, and the particle diameter D90 of magnesium hydroxide is less than or equal to 1.5 mu m; the surfactant is one of polyethylene glycol 400 dilaurate, polyethylene glycol 400 distearate, polyethylene glycol 600 distearate, polyethylene glycol 400 monooleate, polyethylene glycol 400 dioleate, polyethylene glycol 600 monooleate and polyethylene glycol 600 dioleate.
2. The flame retardant polyethylene material according to claim 1, wherein said low density polyethylene has a melt index of 60g/10min.
3. The flame retardant polyethylene material according to claim 1, wherein said linear low density polyethylene has a melt index of 20g/10min.
4. The flame retardant polyethylene material according to claim 1, wherein the weight ratio of antioxidant 168 to antioxidant 1010 is 1:3-4.
5. The flame retardant polyethylene material according to claim 1, wherein said lubricant is polyethylene wax and said acid absorber is calcium stearate.
6. The flame retardant polyethylene material according to claim 1, wherein the surfactant comprises polyethylene glycol 400 dilaurate in an amount of 0.2 to 0.3 parts by weight.
7. A method for preparing a flame retardant polyethylene material according to any one of claims 1 to 6, comprising the steps of:
step 1: mixing low density polyethylene, linear low density polyethylene, antimony bromide flame retardant, lubricant, acid absorber, antioxidant 168, magnesium hydroxide, antioxidant 1010 and toner to form a mixture;
step 2: adding the mixture into a double-screw extruder from a blanking head of the double-screw extruder, adding a liquid surfactant into the double-screw extruder from an exhaust port through a weightless liquid feeder, and extruding the mixture in the double-screw extruder after mixing to obtain a strip-shaped flame-retardant polyethylene material;
step 3: and (3) carrying out water cooling, air drying and granulating treatment on the strip-shaped flame-retardant polyethylene material, and then putting the flame-retardant polyethylene material into a mixing barrel for mixing again to obtain the flame-retardant polyethylene material.
8. The method for producing a flame retardant polyethylene material according to claim 1, wherein the extrusion temperature of the twin screw extruder in said step 2 is 160℃to 175℃and the vacuum degree is < -0.8MPa.
9. A simulated christmas tree, characterized in that it is injection molded from a flame retardant polyethylene material according to any one of claims 1-6.
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