CN108587020A - Aobvious shell of high fire-retardance VR and preparation method thereof - Google Patents
Aobvious shell of high fire-retardance VR and preparation method thereof Download PDFInfo
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- CN108587020A CN108587020A CN201810355391.7A CN201810355391A CN108587020A CN 108587020 A CN108587020 A CN 108587020A CN 201810355391 A CN201810355391 A CN 201810355391A CN 108587020 A CN108587020 A CN 108587020A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a kind of aobvious shells of high fire-retardance VR and preparation method thereof, and the preparation method includes：Vermiculite and ammonium polyphosphate solution are mixed, is reacted 12 hours at 70 80 DEG C, PERFORMANCE OF MODIFIED VERMICULITE is obtained after filtering；PERFORMANCE OF MODIFIED VERMICULITE, acrylic resin, polypropylene, amido silicon oil, phenolic resin, Aluminate, filler, lubricant and plasticizer are mixed, mixture M is obtained；Mixture M is added twin-screw extrude, the aobvious shell of high fire-retardance VR is obtained after extruded, molding；Solve the problems, such as that the aobvious shell of existing high fire-retardance VR is difficult to ensure superior mechanical property and flame retardant property simultaneously.
Description
Technical field
The present invention relates to VR manufacturing field of equipment, and in particular, to a kind of aobvious shell of high fire-retardance VR and preparation method thereof.
Background technology
Since the harmfulness of fire is very big, therefore fire-retardant problem is paid attention to by people already, and the application of plastic products has been popularized
Arrived the every field of national economy, such as appliance cord, construction material, aerospace parts be required to it is fire-retardant.Universal raising modeling
Expect that the method for anti-flammability is that fire retardant is added in plastic raw materials, contain halogen in the fire retardant of plurality, when burning releases
Hydrogen halide is toxic to human body and has strong smothering action, moreover, most fire retardants is often accompanied by dense smoke in burning,
Hinder visibility when rescue.Later people, which notice, develops less toxic side effect, the fire retardant new varieties of low cigarette, but these
The shortcomings of addition of fire retardant, which is also difficult to overcome, makes plastics heat resistance and mechanical properties decrease, and craftsmanship is deteriorated.
Therefore it provides it is a kind of under the premise of guarantee plastics excellent mechanical property, effectively improve the high resistant of plastic material flame retardant
Fire the problem of VR aobvious shell and preparation method thereof is urgent need to resolve of the present invention.
Invention content
The object of the present invention is to provide a kind of aobvious shells of high fire-retardance VR and preparation method thereof, solve existing VR and show
Shell is difficult the problem of ensureing superior mechanical property and flame retardant property simultaneously.
To achieve the goals above, the present invention provides a kind of preparation method of the aobvious shell of high fire-retardance VR, the preparations
Method includes：
(1) vermiculite and ammonium polyphosphate solution are mixed, is reacted 1-2 hours at 70-80 DEG C, modified leech is obtained after filtering
Stone；
(2) by PERFORMANCE OF MODIFIED VERMICULITE, acrylic resin, polypropylene, amido silicon oil, phenolic resin, Aluminate, filler, lubrication
Agent and plasticizer mixing, obtain mixture M；
(3) mixture M is added twin-screw extrude, the aobvious shell of high fire-retardance VR is obtained after extruded, molding；Its
In, the condition of extrusion includes：The rotating speed of screw rod is 200-300 revs/min, and the temperature of feeding section is 200-210 DEG C, fusion plastification
The temperature of section is 240-250 DEG C, and the temperature for mixing homogenizing zone is 210-220 DEG C, and the temperature of melt conveying metering section is 180-200
℃。
The present invention also provides a kind of aobvious shells of high fire-retardance VR, and the aobvious shell of high fire-retardance VR is by above-mentioned preparation side
Method is made.
Through the above technical solutions, the present invention provides a kind of aobvious shell of high fire-retardance VR and preparation method thereof, the system
Preparation Method includes：Vermiculite and ammonium polyphosphate solution are mixed, reacted 1-2 hours at 70-80 DEG C, modified leech is obtained after filtering
Stone；By PERFORMANCE OF MODIFIED VERMICULITE, acrylic resin, polypropylene, amido silicon oil, phenolic resin, Aluminate, filler, lubricant and plasticising
Agent mixes, and obtains mixture M；Mixture M is added twin-screw extrude, it is aobvious that high fire-retardance VR is obtained after extruded, molding
Shell；Pass through the synergistic effect between each raw material so that flame retardant plastics obtained is provided simultaneously with excellent mechanical performance and fire-retardant
Performance, meanwhile, the method that is used to prepare the flame retardant plastics is simple, raw material is easy to get.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of preparation method of the aobvious shell of high fire-retardance VR, the preparation method includes：
(1) vermiculite and ammonium polyphosphate solution are mixed, is reacted 1-2 hours at 70-80 DEG C, modified leech is obtained after filtering
Stone；
(2) by PERFORMANCE OF MODIFIED VERMICULITE, acrylic resin, polypropylene, amido silicon oil, phenolic resin, Aluminate, filler, lubrication
Agent and plasticizer mixing, obtain mixture M；
(3) mixture M is added twin-screw extrude, the aobvious shell of high fire-retardance VR is obtained after extruded, molding；Its
In, the condition of extrusion includes：The rotating speed of screw rod is 200-300 revs/min, and the temperature of feeding section is 200-210 DEG C, fusion plastification
The temperature of section is 240-250 DEG C, and the temperature for mixing homogenizing zone is 210-220 DEG C, and the temperature of melt conveying metering section is 180-200
℃。
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, relative to the acrylic resin of 100 parts by weight, the dosage of PERFORMANCE OF MODIFIED VERMICULITE is 2-8 parts by weight, and polyacrylic dosage is
The dosage of 20-30 parts by weight, amido silicon oil is 25-45 parts by weight, and the dosage of phenolic resin is 40-80 parts by weight, Aluminate
Dosage is 2-10 parts by weight, and the dosage of filler is 2-7 parts by weight, and the dosage of lubricant is 2-7 parts by weight, the dosage of plasticizer
For 2-8 parts by weight.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, relative to the acrylic resin of 100 parts by weight, the dosage of PERFORMANCE OF MODIFIED VERMICULITE is 4-6 parts by weight, and polyacrylic dosage is
The dosage of 24-26 parts by weight, amido silicon oil is 30-40 parts by weight, and the dosage of phenolic resin is 50-70 parts by weight, Aluminate
Dosage is 4-6 parts by weight, and the dosage of filler is 4-5 parts by weight, and the dosage of lubricant is 4-5 parts by weight, the dosage of plasticizer
For 4-6 parts by weight.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, in step (1), vermiculite and ammonium polyphosphate solution are 1 according to mass ratio：20-30 ratios are mixed.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, the mass concentration of ammonium polyphosphate solution is 40-60%.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, filler is one or more in calcium carbonate, clay, silicate and vermiculite.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, lubricant is one or more in stearic acid, stearate, polypropylene wax, paraffin and oleamide.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, plasticizer is selected from phthalate compound, terephthalic acid ester compound and trimellitic acid esters chemical combination
It is one or more in object.
In a kind of preferred embodiment of the present invention, in order to further increase mechanical property and the resistance of plastics obtained
Performance is fired, polyacrylic weight average molecular weight is 5000-8000, and the weight average molecular weight of phenolic resin is 9000-12000, acrylic acid
The weight average molecular weight of resin is 5000-6000.
The present invention also provides a kind of aobvious shells of high fire-retardance VR, and the aobvious shell of high fire-retardance VR is by above-mentioned preparation side
Method is made.
The present invention will be described in detail by way of examples below.In following embodiment, polyacrylic weight average molecular weight
Weight average molecular weight for 5000-8000, phenolic resin is 9000-12000, and the weight average molecular weight of acrylic resin is 5000-
6000；The commercially available product that organic silicon fibre retardant is KR-2710 by the trade mark that Shanghai Guang Bin trade Co., Ltds provide.It stretches below strong
Spending parameter is measured by the method for GB1040-2006, and elongation at break parameter is measured by the method for GB1040-2006,
Flame retardant property passes through GB/T2406.2-2009《Plastics measure burning behavior with oxygen index method》Method measure.
Embodiment 1
It (is 1 according to mass ratio that 10g vermiculites and ammonium polyphosphate solution, which are mixed,：20 ratios are mixed, wherein polyphosphoric acid
The mass concentration of ammonium salt solution is 40%), to be reacted 1 hour at 70 DEG C, PERFORMANCE OF MODIFIED VERMICULITE is obtained after filtering；By 4g PERFORMANCE OF MODIFIED VERMICULITEs,
100g acrylic resins, 24g polypropylene, 30g amido silicon oils, 50g phenolic resin, 4g Aluminates, 4g calcium carbonate, 4g stearic acid and
4g phthalate compounds mix, and obtain mixture M；Mixture M is added twin-screw extrude, it is extruded, at
High fire-retardance VR is obtained after type (being molded by the way of hot-forming, and the temperature of hot pressing is 40 DEG C, the pressure of hot pressing is 30MPa)
Aobvious shell A1；Wherein, the condition of extrusion includes：The rotating speed of screw rod is 200 revs/min, and the temperature of feeding section is 200 DEG C, is melted
The temperature for melting fluxing zone is 240 DEG C, and the temperature for mixing homogenizing zone is 210 DEG C, and the temperature of melt conveying metering section is 180 DEG C.It is high
The tensile strength of fire-retardant VR aobvious shell A1 is 16.9Mpa, elongation at break 241%, oxygen index (OI) 53.
Embodiment 2
It (is 1 according to mass ratio that 10g vermiculites and ammonium polyphosphate solution, which are mixed,：30 ratios are mixed, wherein polyphosphoric acid
The mass concentration of ammonium salt solution is 60%), to be reacted 2 hours at 80 DEG C, PERFORMANCE OF MODIFIED VERMICULITE is obtained after filtering；By 6g PERFORMANCE OF MODIFIED VERMICULITEs,
100g acrylic resins, 26g polypropylene, 40g amido silicon oils, 70g phenolic resin, 6g Aluminates, 5g silicates (sodium metasilicate), 5g
Polypropylene wax and the mixing of 6g terephthalic acid ester compounds, obtain mixture M；Mixture M is added twin-screw extrude,
After extruded, molding (being molded by the way of hot-forming, and the temperature of hot pressing is 40 DEG C, the pressure of hot pressing is 30MPa)
To VR aobvious shell A2 of high fire-retardance；Wherein, the condition of extrusion includes：The rotating speed of screw rod is 300 revs/min, the temperature of feeding section
It it is 210 DEG C, the temperature of fusion plastification section is 250 DEG C, and the temperature for mixing homogenizing zone is 220 DEG C, the temperature of melt conveying metering section
It is 200 DEG C.The tensile strength of the aobvious shell A2 of high fire-retardance VR is 16.3Mpa, elongation at break 244%, oxygen index (OI) 55.
Embodiment 3
It (is 1 according to mass ratio that 10g vermiculites and ammonium polyphosphate solution, which are mixed,：25 ratios are mixed, wherein polyphosphoric acid
The mass concentration of ammonium salt solution is 50%), to be reacted 1.5 hours at 75 DEG C, PERFORMANCE OF MODIFIED VERMICULITE is obtained after filtering；By 5g PERFORMANCE OF MODIFIED VERMICULITEs,
100g acrylic resins, 25g polypropylene, 35g amido silicon oils, 60g phenolic resin, 5g Aluminates, 4.5g vermiculites, 4.5g oleic acid acyls
Amine and the mixing of 5g trimellitic acid esters compounds, obtain mixture M；Mixture M is added twin-screw extrude, extruded,
High fire-retardance is obtained after molding (being molded by the way of hot-forming, and the temperature of hot pressing is 40 DEG C, the pressure of hot pressing is 30MPa)
VR aobvious shell A3；Wherein, the condition of extrusion includes：The rotating speed of screw rod is 250 revs/min, and the temperature of feeding section is 205 DEG C,
The temperature of fusion plastification section is 245 DEG C, and the temperature for mixing homogenizing zone is 215 DEG C, and the temperature of melt conveying metering section is 190 DEG C.
The tensile strength of the aobvious shell A3 of high fire-retardance VR is 16.9Mpa, elongation at break 247%, oxygen index (OI) 51.
Embodiment 4
It is prepared according to the method for embodiment 3, unlike, relative to the acrylic resin of 100g, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 2g, and polyacrylic dosage is 20g, and the dosage of amido silicon oil is 25g, and the dosage of phenolic resin is 40g, the use of Aluminate
Amount is 2g, and the dosage of filler is 2g, and the dosage of lubricant is 2g, and the dosage of plasticizer is 2g, obtains the aobvious shell of high fire-retardance VR
Body A4.The tensile strength of the aobvious shell A4 of high fire-retardance VR is 17.1Mpa, elongation at break 241%, oxygen index (OI) 51.
Embodiment 5
It is prepared according to the method for embodiment 3, unlike, relative to the acrylic resin of 100g, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 8g, and polyacrylic dosage is 30g, and the dosage of amido silicon oil is 45g, and the dosage of phenolic resin is 80g, the use of Aluminate
Amount is 10g, and the dosage of filler is 7g, and the dosage of lubricant is 7g, and the dosage of plasticizer is 8g, obtains the aobvious shell of high fire-retardance VR
Body A5.The tensile strength of the aobvious shell A5 of high fire-retardance VR is 17.4Mpa, elongation at break 222%, oxygen index (OI) 55.
Embodiment 6
It is prepared according to the method for embodiment 3, unlike, relative to the acrylic resin of 100g, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 1g, and polyacrylic dosage is 15g, and the dosage of amido silicon oil is 20g, and the dosage of phenolic resin is 35g, the use of Aluminate
Amount is 1g, and the dosage of filler is 1g, and the dosage of lubricant is 1g, and the dosage of plasticizer is 1g, obtains the aobvious shell of high fire-retardance VR
Body A6.The tensile strength of the aobvious shell A6 of high fire-retardance VR is 17.7Mpa, elongation at break 241%, oxygen index (OI) 55.
Embodiment 7
It is prepared according to the method for embodiment 3, unlike, relative to the acrylic resin of 100g, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 10g, and polyacrylic dosage is 35g, and the dosage of amido silicon oil is 50g, and the dosage of phenolic resin is 85g, Aluminate
Dosage is 15g, and the dosage of filler is 10g, and the dosage of lubricant is 10g, and the dosage of plasticizer is 10g, obtains high fire-retardance VR
Aobvious shell A7.The tensile strength of the aobvious shell A7 of high fire-retardance VR is 17.1Mpa, and elongation at break 244%, oxygen index (OI) is
51。
Comparative example 1
It is prepared according to the method for embodiment 3, unlike, the condition of expressing technique includes：The rotating speed of screw rod is 150
Rev/min, the temperature of feeding section is 180 DEG C, and the temperature of fusion plastification section is 220 DEG C, and the temperature for mixing homogenizing zone is 180 DEG C,
The temperature of melt conveying metering section is 150 DEG C, obtains the aobvious shell D1 of high fire-retardance VR.The stretching of the aobvious shell D1 of high fire-retardance VR is strong
Degree is 11.1Mpa, elongation at break 141%, oxygen index (OI) 32.
Comparative example 2
It is prepared according to the method for embodiment 3, unlike, the condition of expressing technique includes：The rotating speed of screw rod is 350
Rev/min, the temperature of feeding section is 240 DEG C, and the temperature of fusion plastification section is 260 DEG C, and the temperature for mixing homogenizing zone is 240 DEG C,
The temperature of melt conveying metering section is 220 DEG C, obtains the aobvious shell D2 of high fire-retardance VR.The stretching of the aobvious shell D2 of high fire-retardance VR is strong
Degree is 12.1Mpa, elongation at break 131%, oxygen index (OI) 23.
Comparative example 3
It is prepared according to the method for embodiment 3, unlike, do not include polypropylene in raw material, obtains high fire-retardance VR heads
Aobvious shell D3.The tensile strength of the aobvious shell D3 of high fire-retardance VR is 11.4Mpa, elongation at break 124%, oxygen index (OI) 23.
Comparative example 4
It is prepared according to the method for embodiment 3, unlike, do not include amido silicon oil in raw material, obtains high fire-retardance VR
Aobvious shell D4.The tensile strength of the aobvious shell D4 of high fire-retardance VR is 13.4Mpa, and elongation at break 150%, oxygen index (OI) is
30。
Comparative example 5
It is prepared according to the method for embodiment 3, unlike, do not include phenolic resin in raw material, obtains high fire-retardance VR
Aobvious shell D5.The tensile strength of the aobvious shell D5 of high fire-retardance VR is 12.5Mpa, and elongation at break 131%, oxygen index (OI) is
24。
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of simple variants to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of preparation method of the aobvious shell of high fire-retardance VR, which is characterized in that the preparation method includes：
(1) vermiculite and ammonium polyphosphate solution are mixed, is reacted 1-2 hours at 70-80 DEG C, PERFORMANCE OF MODIFIED VERMICULITE is obtained after filtering；
(2) by PERFORMANCE OF MODIFIED VERMICULITE, acrylic resin, polypropylene, amido silicon oil, phenolic resin, Aluminate, filler, lubricant and
Plasticizer mixes, and obtains mixture M；
(3) mixture M is added twin-screw extrude, the aobvious shell of high fire-retardance VR is obtained after extruded, molding；Wherein, it squeezes
The condition gone out includes：The rotating speed of screw rod is 200-300 revs/min, and the temperature of feeding section is 200-210 DEG C, fusion plastification section
Temperature is 240-250 DEG C, and the temperature for mixing homogenizing zone is 210-220 DEG C, and the temperature of melt conveying metering section is 180-200 DEG C.
2. preparation method according to claim 1, wherein relative to the acrylic resin of 100 parts by weight, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 2-8 parts by weight, and polyacrylic dosage is 20-30 parts by weight, and the dosage of amido silicon oil is 25-45 parts by weight, phenolic aldehyde tree
The dosage of fat is 40-80 parts by weight, and the dosage of Aluminate is 2-10 parts by weight, and the dosage of filler is 2-7 parts by weight, lubricant
Dosage be 2-7 parts by weight, the dosage of plasticizer is 2-8 parts by weight.
3. preparation method according to claim 2, wherein relative to the acrylic resin of 100 parts by weight, PERFORMANCE OF MODIFIED VERMICULITE
Dosage is 4-6 parts by weight, and polyacrylic dosage is 24-26 parts by weight, and the dosage of amido silicon oil is 30-40 parts by weight, phenolic aldehyde tree
The dosage of fat is 50-70 parts by weight, and the dosage of Aluminate is 4-6 parts by weight, and the dosage of filler is 4-5 parts by weight, lubricant
Dosage be 4-5 parts by weight, the dosage of plasticizer is 4-6 parts by weight.
4. preparation method according to claim 2 or 3, wherein in step (1), vermiculite and ammonium polyphosphate solution according to
Mass ratio is 1：20-30 ratios are mixed.
5. preparation method according to claim 4, wherein the mass concentration of ammonium polyphosphate solution is 40-60%.
6. preparation method according to claim 2 or 3, wherein filler is selected from calcium carbonate, clay, silicate and vermiculite
In it is one or more.
7. preparation method according to claim 2 or 3, wherein lubricant be selected from stearic acid, stearate, polypropylene wax,
It is one or more in paraffin and oleamide.
8. preparation method according to claim 2 or 3, wherein plasticizer is selected from phthalate compound, to benzene
It is one or more in diformic ester compound and trimellitic acid esters compound.
9. preparation method according to claim 2 or 3, wherein polyacrylic weight average molecular weight is 5000-8000, phenolic aldehyde
The weight average molecular weight of resin is 9000-12000, and the weight average molecular weight of acrylic resin is 5000-6000.
10. a kind of aobvious shell of high fire-retardance VR, which is characterized in that the aobvious shell of high fire-retardance VR in claim 1-9 by appointing
Preparation method described in meaning one is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810355391.7A CN108587020A (en) | 2018-04-19 | 2018-04-19 | Aobvious shell of high fire-retardance VR and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810355391.7A CN108587020A (en) | 2018-04-19 | 2018-04-19 | Aobvious shell of high fire-retardance VR and preparation method thereof |
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| CN108587020A true CN108587020A (en) | 2018-09-28 |
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| Country | Link |
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2018
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Application publication date: 20180928 |