CN109836700A - A kind of preparation method and expanded polypropylene of fire-retardant low thermally conductive expanded polypropylene - Google Patents
A kind of preparation method and expanded polypropylene of fire-retardant low thermally conductive expanded polypropylene Download PDFInfo
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- CN109836700A CN109836700A CN201811428948.1A CN201811428948A CN109836700A CN 109836700 A CN109836700 A CN 109836700A CN 201811428948 A CN201811428948 A CN 201811428948A CN 109836700 A CN109836700 A CN 109836700A
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- expanded polypropylene
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Abstract
The invention belongs to foam material field, the preparation method and expanded polypropylene of a kind of fire-retardant low thermally conductive expanded polypropylene are provided, including extrusion, one step foaming, second time of foaming, health, melt bonded and etc..Expanded polypropylene can not only be met in the present invention with excellent anti-flammability, low heat conductivity, excellent mechanical property, and mature production technology can also be possessed, can be mass-produced.
Description
Technical field
The invention belongs to foam material fields, are related to a kind of expanded polypropylene, in particular to a kind of fire-retardant low thermally conductive foaming
Polyacrylic preparation method and expanded polypropylene.
Background technique
Foamed material has the functions such as buffering, sound-absorbing, shock-absorbing, heat preservation, filtering, answers extensively since light weight, pliability are good
For industries such as electronics, household electrical appliances, automobile, Leisure Sports.Common foamed material has polyethylene foamed (EPE), expanded polypropylene
(EPP), expanded polystyrene (EPS) (EPS), polyurathamc (foaming PU), foamed polyvinyl chloride (foaming PVC) etc..With foaming polyphenyl
The difficult foamed material of the degradation such as ethylene, polyurathamc, foamed polyvinyl chloride is compared, and expanded polypropylene can be degradable, no
It will cause environmental pollution；And compared with polyethylene foamed, the mechanical strength and impact strength of expanded polypropylene are higher by several times, and
And the use temperature of polyethylene foamed only has 80 DEG C, and the use temperature of expanded polypropylene is up to 130 DEG C.
The various excellent performances that expanded polypropylene itself has can assign it not by different being modified in practical applications
Same performance, fire proofing is exactly one type.Fire proofing refer to be able to suppress or retardation burning and itself and do not allow
Incendive material is widely used in the fields such as petroleum, chemical industry, national defence, fire-fighting, with the development of science and technology, fire proofing is also gradually
Gradually penetrate into building trade and automobile industry.Fire-retardant low thermally conductive expanded polypropylene is a kind of emerging fire proofing, light weight,
Good flame retardation effect, shock resistance are good, are the only choosings as light flame-retardant material.But at present to fire-retardant low thermally conductive hair
The research of foaming polypropylene only rests on laboratory stage, most important the reason is that cannot be considered in terms of its anti-flammability, low heat conductivity and power
Learning performance will necessarily be such that mechanical property reduces, expanded polypropylene when fire-retardant and low thermally conductive component is added in expanded polypropylene
Material can become fragile, and reduce its use scope.
Therefore, it is necessary to the preparation methods and expanded polypropylene of a kind of fire-retardant low thermally conductive expanded polypropylene, can not only meet system
The expanded polypropylene obtained has excellent anti-flammability, low heat conductivity, can also possess excellent mechanical property, and production technology
Maturation can be mass-produced.
Summary of the invention
The purpose of the present invention is being directed to the above-mentioned problems in the prior art, it is poly- to provide a kind of fire-retardant low thermally conductive foaming
The preparation method and expanded polypropylene of propylene.
Object of the invention can be realized by the following technical scheme: a kind of preparation of fire-retardant low thermally conductive expanded polypropylene
Method, comprising the following steps:
S1, low heat conductive flame-retarding master batch is prepared with dual-screw-stem machine, the fire-retardant master granule includes polypropylene microcrystal grain, fire retardant and piece
Shape graphite；
S2, PP GRANULES enter single-screw machine together with fire-retardant master granule, adjust the parameter of single-screw machine in each batch mixing segment,
It is uniformly mixed PP GRANULES with fire-retardant master granule, rate of closed hole when uniformity and foaming to guarantee PP GRANULES performance；
S3, the material squeezed out in step S2 is sent into autoclave, low thermal conductivity gas is full of in the autoclave, into autoclave
Foaming agent, stabilizer is added, temperature-pressure carries out one step foaming, the PP GRANULES volume expansion 10-20 after making one step foaming
Times, make to form closed pore inside expanded polypropylene, low thermal conductivity gas is full of in closed pore, it is poly- that fire retardant and flake graphite are attached to foaming
On the abscess outer wall of propylene；
S4, the material in step S3 is passed through into second time of foaming machine, two is carried out in the accumulator filled with air and low thermal conductivity gas
Secondary foaming, 30-50 times of PP GRANULES volume expansion after making second time of foaming, the abscess inside PP GRANULES keep closed pore shape
State, filled with low thermal conductivity gas in closed pore；
S5, the product in step S4 is screened, the expanded polypropylene particle of different coefficient of foaming is placed respectively；
S6, the expanded polypropylene particle of coefficient of foaming same or similar in step S5 is carried out to high-temperature fusion bonding, two foaming
The difference of coefficient of foaming between PP GRANULES be no more than five times, avoid because granular size unevenness high-temperature fusion bonding when caused by
Closed pore rupture；
S7, the product in step S6 is dried, is cut.
Preferably, the expanded particle after one step foaming is being sent out due to being mixed into flake graphite in PP GRANULES
Its rate of closed hole can be reduced when bubble, it is therefore desirable to carrying out health ensures the stability of its hole-closing structure, by the product in step S3 into
Health of row, a health are to send the material after one step foaming to a health preservation cabin, and a health preservation cabin is ventilative
Stainless steel mesh bag, allow the steady curing molding of abscess outside wall surface of expanded polypropylene particle, and keep its rate of closed hole.
Preferably, the product in step S5 is carried out secondary health, secondary health is to gather the foaming after second time of foaming
Particulate propylene is pumped into secondary health preservation cabin, and the secondary health preservation cabin is ventilative stainless steel mesh bag, and the secondary health can
It allows the steady curing molding of abscess outside wall surface of expanded polypropylene particle under high magnification, keeps rate of closed hole.
Preferably, the gas includes air and low thermal conductivity gas, the low heat conductivity gas filled with gas in the abscess
Body is CO2Or low thermal conductivity gas or CO2Mixing between the mixing or low thermal conductivity gas of low thermal conductivity gas.
Preferably, polypropylene microcrystal grain is made before the expanded polypropylene granule foaming, the polypropylene crystallite
The partial size of grain is 0.5-1.5mm.
Preferably, fire retardant is low halogen environmental protection fire retarding agent.
Preferably, in the step S2, with the parameter of arithmetic progression or Geometric Sequence adjustment single-screw machine.
Preferably, the one step foaming makes 13-15 times of polypropylene volume expansion.
Preferably, the second time of foaming makes 45-48 times of polypropylene volume expansion.
Preferably, the wall thickness of the outer wall is 2-4 μm, the internal diameter of the closed pore is 12-25 μm, the closed pore and closed pore
Between spacing be 1-10 μm.
Preferably, the one step foaming temperature of the expanded polypropylene particle is 140-180 DEG C, pressure is 10-40 big
Air pressure.
Preferably, the second time of foaming temperature of the expanded polypropylene particle is 140-180 DEG C, pressure is 10-40 big
Air pressure.
Preferably, the temperature of the expanded polypropylene particle fusion bonding is 140-200 DEG C, pressure is 10-40 big
Air pressure.
Preferably, expanded polypropylene particle has 80% or more rate of closed hole, low thermal conductivity gas is filled in closed pore.
A kind of fire-retardant low thermally conductive expanded polypropylene, is made of above-mentioned preparation method.
Compared with prior art, the invention has the following advantages that
1, the preparation method that the present invention uses can not only meet expanded polypropylene with excellent anti-flammability, low heat conductivity, may be used also
To possess excellent mechanical property, and mature production technology, can be mass-produced.
2, the present invention passes through the modification of expanded polypropylene particle, adjusts its closed pore outer wall wall thickness and hole-closing structure, makes its tool
There are low thermal conductivity and excellent anti-flammability.
3, the present invention is formed in mold by the bond vitrified of temperature-pressure outer wall by a large amount of expanded polypropylenes, passes through control
Temperature, pressure when foaming etc. control the quantity and size of closed pore, and expanded polypropylene particle has 80% or more rate of closed hole, closes
It is filled with low thermally conductive, nonflammable gas in hole, improves the flame retardant effect of foaming polypropylene sheet and reduces thermal coefficient.
4, the present invention makes expanded polypropylene after being added to the auxiliary agents such as flake graphite, fire retardant by optimized production process
Mechanical property is almost unchanged.
5, there is health step after expanded polypropylene foams every time in the present invention, make the adherency that flake graphite is stronger
On the outer wall of expanded polypropylene particle, make sticky bigger, the expanded polypropylene of finished product between each expanded polypropylene particle
Sheet mechanical property is more preferably.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Environmentally friendly, light, fire-retardant, low thermally conductive foamed material is made, first since sorting, common foamed material has hair
Polyurethane, expanded polystyrene (EPS), expanded polypropylene, expanded polypropylene etc. are steeped, the foaming process use of polyurathamc is to human body
Harmful isocyanates, and have residue in product, product can not recycle；Expanded polystyrene (EPS) can make in foaming process
Fluorochlorohydrocarbon compound or butane are used, environment is adversely affected, product degradation difficulty and white pollution easy to form, the United Nations's ring
Tissue is protected it is determined that stopping using foamed polystyrene product；Polyethylene foamed is rigidly lower, and maximum operation (service) temperature is only 80 DEG C.
And expanded polypropylene has very excellent low heat conductivity and anti-flammability, and is up to 130 DEG C using temperature, burning
Rate only has 0-80mm/min, has self-extinguishing without fire characteristic, and the smog generated in burning is few, and smog is non-toxic, drippage
Object does not cause second-time burning, is the fire-retardant low thermally conductive preferred material of production.In addition, also there is expanded polypropylene superior antidetonation to inhale
Energy performance, response rate is high after deformation, has good chemical-resistant, oil resistivity, heat resistance and thermal insulation, in addition, foaming is poly-
Propylene light weight, the weight or a kind of green material, recoverable that article can be greatly reduced not will cause white
Color pollution, can be widely applied to the industries such as building, automobile, electronics, packaging.
In the manufacturing process of expanded polypropylene, thermal conductivity and anti-flammability be it is conflicting, dropped using the means such as modified
The thermal conductivity of low foaming polypropylene will certainly reduce its anti-flammability, and therefore, how to make not only has lower thermal conductivity but also have
The expanded polypropylene of preferable flame retardant effect is always the problem of industry.Thermal conductivity and gaseous exchange, radiant heat etc. are close because being known as
Cutting link, the present invention considers from this starting point of radiant heat for reducing material, introduces the flake graphite of radiant heat transfer difference, it is desirable to
Flake graphite is coated on to the surface of expanded polypropylene particle, such expanded polypropylene not only can guarantee its anti-flammability, but also can guarantee
Its low heat conductivity.But expanded polypropylene at this time still remains two larger problems: 1, with the addition of flake graphite,
Expanded polypropylene material mechanical property is greatly reduced；2, flake graphite and polypropylene material are not easy to combine, can not be according to having imagined
It is coated on the surface of expanded polypropylene particle entirely, and the rate of closed hole of expanded polypropylene can be made to decline, is made low thermally conductive in closed pore
Gas evolution.
In order to solve above-mentioned two problems, from the structure of expanded polypropylene and manufacture craft, each mixing is adjusted
The Screw Extrusion parameter of section, and all carry out health step after each foaming, it is ensured that the stability of hole-closing structure, then again into
Row hot melt pressurizing binding molding, forms the expanded polypropylene material for having both anti-flammability, low heat conductivity and mechanical strength.
It is specific structure and its manufacture craft of the invention below:
A kind of preparation method of fire-retardant low thermally conductive expanded polypropylene, comprising the following steps:
S1, low heat conductive flame-retarding master batch is prepared with dual-screw-stem machine, the fire-retardant master granule includes polypropylene microcrystal grain, fire retardant and piece
Shape graphite；
S2, PP GRANULES enter single-screw machine together with fire-retardant master granule, adjust the parameter of single-screw machine in each batch mixing segment,
It is uniformly mixed PP GRANULES with fire-retardant master granule, rate of closed hole when uniformity and foaming to guarantee PP GRANULES performance；
S3, the material squeezed out in step S2 is sent into autoclave, low thermal conductivity gas is full of in the autoclave, into autoclave
Foaming agent, stabilizer is added, temperature-pressure carries out one step foaming, the PP GRANULES volume expansion 10-20 after making one step foaming
Times, make to form closed pore inside expanded polypropylene, low thermal conductivity gas is full of in closed pore, it is poly- that fire retardant and flake graphite are attached to foaming
On the abscess outer wall of propylene；
S4, the material in step S3 is passed through into second time of foaming machine, two is carried out in the accumulator filled with air and low thermal conductivity gas
Secondary foaming, 30-50 times of PP GRANULES volume expansion after making second time of foaming, the abscess inside PP GRANULES keep closed pore shape
State, filled with low thermal conductivity gas in closed pore；
S5, the product in step S4 is screened, the expanded polypropylene particle of different coefficient of foaming is placed respectively；
S6, the expanded polypropylene particle of coefficient of foaming same or similar in step S5 is carried out to high-temperature fusion bonding, two foaming
The difference of coefficient of foaming between PP GRANULES be no more than five times, avoid because granular size unevenness high-temperature fusion bonding when caused by
Closed pore rupture；
S7, the product in step S6 is dried, is cut.
Expanded particle after one step foaming can be reduced due to being mixed into flake graphite in PP GRANULES when being foamed
Its rate of closed hole, it is therefore desirable to carrying out health ensures the stability of its hole-closing structure, and the product in step S3 is carried out a health,
Health is to send the material after one step foaming to a health preservation cabin, and a health preservation cabin is ventilative stainless (steel) wire
Bag, allows the steady curing molding of abscess outside wall surface of expanded polypropylene particle, and keeps its rate of closed hole.
Product in step S5 is subjected to secondary health, secondary health is to pump the expanded polypropylene particle after second time of foaming
It is sent to secondary health preservation cabin, the secondary health preservation cabin is ventilative stainless steel mesh bag, and the secondary health can allow under high magnification
Expanded polypropylene particle the steady curing molding of abscess outside wall surface, keep rate of closed hole.
Filled with gas in abscess, gas includes air and low thermal conductivity gas, low thermal conductivity gas CO2Or low thermal conductivity gas or
CO2Mixing between the mixing or low thermal conductivity gas of low thermal conductivity gas.It is micro- that polypropylene is made before expanded polypropylene granule foaming
Brilliant particle, the partial size of polypropylene microcrystal grain are 0.5-1.5mm.Fire retardant is low halogen environmental protection fire retarding agent.The hair of the technical program
Increasing in foaming polypropylene particle has fire retardant, further increases the flame retardant property that plate is made in expanded polypropylene, expands and uses model
It encloses.
In step S2, with the parameter of arithmetic progression or Geometric Sequence adjustment single-screw machine.
One step foaming makes 13-15 times of polypropylene volume expansion.
Second time of foaming makes 45-48 times of polypropylene volume expansion.
The wall thickness of outer wall is 2-4 μm, and the internal diameter of closed pore is 12-25 μm.Outer wall in the expanded polypropylene of the technical program
Wall ratio conventional material is thick, keeps internal closed pore performance more stable, the internal diameter of closed pore is larger, inside has low thermal conductivity gas amount more
It is more, there is the performance for reducing thermal coefficient.
The one step foaming temperature of expanded polypropylene particle is 140-180 DEG C, and pressure is 10-40 atmospheric pressure.
The second time of foaming temperature of expanded polypropylene particle is 140-180 DEG C, and pressure is 10-40 atmospheric pressure.
The temperature of expanded polypropylene particle fusion bonding is 140-200 DEG C, and pressure is 10-40 atmospheric pressure.
Expanded polypropylene particle has 80% or more rate of closed hole, is filled with low thermal conductivity gas in closed pore.
Fire retardant is environment-protective halogen-free or low halogen fire retardant.
Mainly based on phosphorus series compound and metal hydroxides, JLH-W666 type high-performance phosphorus can be used in halogen-free flame retardants
Nitrogen class organic fire-retardant, W666 are a kind of triazinetrione compound and yuban class compound, be have passed through at special surface
Reason is not precipitated so being easy dispersion in a plastic material, has good flame retardant effect.
HR-100 can be used in low halogen fire retardant, and HR-100 is a kind of highly effective reaction type fire retardant containing elements such as P, Br, main
It will be designed for the flame-retardant modified of homopolymerization PP.Directly addition uses, without adding the fire retarding synergists such as antimony trioxide.Compared to tradition
Bromide fire retardant (the double S ether of deca-BDE, tetrabromobisphenol A, eight bromo ether, eight bromines, TBC etc.) additive amount it is few, good flame retardation effect,
Bromine content is low, and the filling such as can add talcum powder, barium sulfate, while the fire retardant also has very excellent processing heat steady
It is fixed, no precipitations property, water-fast, light aging resisting, it is nontoxic, not with the characteristics such as color masterbatch and the generation side reaction of other additives.And it can be with
Pass through ROHS and REACH environmental requirement.
YYFR-032F also can be used in low halogen fire retardant, and YYFR-032F is a by phosphorus, nitrogen, the coefficient response type of bromine
The low halogen fire retardant of environment-friendly high-efficiency.It is fire-retardant exclusively for the V-2 grade of Ultra Low Cost PP and research and develop, to homopolymerization PP and copolymerization PP
To use, additive amount is few compared with traditional bromide fire retardant, and flame retarding efficiency is high, does not have to plus antimony oxide, bromine content are low.No
Influence the physical and mechanical property of PP material.This fire retardant processing heat stability is good, is not precipitated, water-fast, fast light, nontoxic, meets ROHS
Environmental requirement.Similar product market price is lower.
Polypropylene material also has a special phenomenon, i.e. double melting peaks phenomenon: polypropylene expanded particle in foaming
With unique double behavior, with the raising of blowing temperature or the increase of pressure, double behavior is mobile to high-temperature region, and high temperature peak
Enthalpy reduces, and low temperature peak enthalpy increases；High temperature peak is not molten crystal of the PP microparticle under blowing temperature or with not molten crystal is "
" melting peak of the new crystal of growth, low temperature peak are the melting peak of PP melt crystal obtained by crystallization under quenching effect to core；Melting is double
Peak is formed as in foaming temperature-rise period, and the partially crystallizable of PP has been eliminated caused.In the present invention to polypropylene into
When row foaming, increase the spacing between double melting peaks, that is, increases the time difference that low temperature peak and high temperature peak occur, make into the mould time
Increase, is conducive to the mechanical property and rate of closed hole that increase expanded polypropylene.
Polypropylene that the present invention uses is far from for bimodal volcanic rocks, being provided simultaneously with excellent physical mechanical strength and excellent
Processing performance, wherein for high molecular weight moieties to guarantee its physical mechanical strength, low molecular weight part plays lubrication in resin
With the effect of bonding, to improve product processability.
For the pp material that the present invention uses by processing, the temperature difference between low temperature peak and high temperature peak is larger, can prolong
Grow up to the mould time, expanded polypropylene is made to have closed pore and preferable mechanical property, and filled with fire-retardant low thermally conductive gas in closed pore
Body, so that expanded polypropylene be made to have anti-flammability, low heat conductivity and preferable mechanical property concurrently.
Expanded polypropylene material flame retardant effect of the invention can reach the grade of the B1 in national standard, and that makes through the invention is fire-retardant
Low thermally conductive expanded polypropylene, thermal coefficient only have 0.025-0.032, and the best foaming of thermal conductivity currently on the market poly- third
The thermal coefficient of alkene is 0.040, and the thermal coefficient of the fire-retardant low thermally conductive expanded polypropylene prepared in the present invention is well below city
Sell expanded polypropylene.
The fire-retardant low thermally conductive expanded polypropylene made through the invention, anti-flammability can reach B1 grades.
The fire-retardant low thermally conductive expanded polypropylene made through the invention, mechanical property and be not added flake graphite, resistance
Mechanical property when firing the auxiliary agents such as agent is suitable.
The fire-retardant low thermally conductive expanded polypropylene that preparation method in through the invention is made, bubble diameter is similar, and closed pore is not easy
Broken, rate of closed hole is high, good flame retardation effect.
There is health step after expanded polypropylene foams every time in the present invention, the material after foaming sent to health preservation cabin,
Health preservation cabin is ventilative stainless steel mesh bag, allows the steady curing molding of abscess outside wall surface of expanded polypropylene particle, and it is kept to close
Porosity makes flake graphite is stronger to be adhered on the outer wall of expanded polypropylene particle, make each expanded polypropylene particle it
Between viscosity it is bigger, the foaming polypropylene sheet mechanical property of finished product is more preferably.
A kind of fire-retardant low thermally conductive expanded polypropylene, is made of above-mentioned preparation method.
Claims (10)
1. a kind of preparation method of fire-retardant low thermally conductive expanded polypropylene, which comprises the following steps:
S1, low heat conductive flame-retarding master batch is prepared with dual-screw-stem machine, the fire-retardant master granule includes polypropylene microcrystal grain, fire retardant and piece
Shape graphite；
S2, PP GRANULES enter single-screw machine together with fire-retardant master granule, adjust the parameter of single-screw machine in each batch mixing segment,
It is uniformly mixed PP GRANULES with fire-retardant master granule, rate of closed hole when uniformity and foaming to guarantee PP GRANULES performance；
S3, the material squeezed out in step S2 is sent into autoclave, low thermal conductivity gas is full of in the autoclave, into autoclave
Foaming agent, stabilizer is added, temperature-pressure carries out one step foaming, the PP GRANULES volume expansion 10-20 after making one step foaming
Times, make to form closed pore inside expanded polypropylene, low thermal conductivity gas is full of in closed pore, it is poly- that fire retardant and flake graphite are attached to foaming
On the abscess outer wall of propylene；
S4, the material in step S3 is passed through into second time of foaming machine, two is carried out in the accumulator filled with air and low thermal conductivity gas
Secondary foaming, 30-50 times of PP GRANULES volume expansion after making second time of foaming, the abscess inside PP GRANULES keep closed pore shape
State, filled with low thermal conductivity gas in closed pore；
S5, the product in step S4 is screened, the expanded polypropylene particle of different coefficient of foaming is placed respectively；
S6, the expanded polypropylene particle of coefficient of foaming same or similar in step S5 is carried out to high-temperature fusion bonding, two foaming
The difference of coefficient of foaming between PP GRANULES be no more than five times, avoid because granular size unevenness high-temperature fusion bonding when caused by
Closed pore rupture；
S7, the product in step S6 is dried, is cut.
2. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that primary
PP GRANULES after foaming, which needs to carry out health, ensures the stability of its hole-closing structure, the product in step S3 is carried out primary
Health, a health be the material after one step foaming is sent to a health preservation cabin, a health preservation cabin be breathe freely it is stainless
Steel mesh bag, allows the steady curing molding of abscess outside wall surface of expanded polypropylene particle, and keeps its rate of closed hole.
3. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1 or 2, which is characterized in that
Product in step S5 is subjected to secondary health, secondary health is secondary for the expanded polypropylene particle after second time of foaming to be pumped into
Health preservation cabin, the secondary health preservation cabin are ventilative stainless steel mesh bag, and the secondary health can allow the foaming under high magnification poly-
The steady curing molding of abscess outside wall surface of particulate propylene keeps rate of closed hole.
4. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that described
Filled with gas in abscess, the gas includes air and low thermal conductivity gas, and the low thermal conductivity gas is CO2Or low thermal conductivity gas or
CO2Mixing between the mixing or low thermal conductivity gas of low thermal conductivity gas.
5. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that described
Polypropylene microcrystal grain is made before expanded polypropylene granule foaming, the partial size of the polypropylene microcrystal grain is 0.5-1.5mm.
6. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that described
The one step foaming temperature of expanded polypropylene particle is 140-180 DEG C, and pressure is 10-40 atmospheric pressure, the expanded polypropylene
The second time of foaming temperature of grain is 140-180 DEG C, and pressure is 10-40 atmospheric pressure.
7. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that described
Fire retardant is low halogen environmental protection fire retarding agent.
8. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that described
In step S2, with the parameter of arithmetic progression or Geometric Sequence adjustment single-screw machine.
9. the preparation method of the fire-retardant low thermally conductive expanded polypropylene of one kind according to claim 1, which is characterized in that foaming
The melt bonded temperature of PP GRANULES is 140-200 DEG C, and pressure is 10-40 atmospheric pressure.
10. a kind of fire-retardant low thermally conductive expanded polypropylene, which is characterized in that can be by as claimed in any one of claims 1 to 9 wherein
Preparation method is made.
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| CN201811428948.1A CN109836700A (en) | 2018-11-27 | 2018-11-27 | A kind of preparation method and expanded polypropylene of fire-retardant low thermally conductive expanded polypropylene |
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| CN201811428948.1A CN109836700A (en) | 2018-11-27 | 2018-11-27 | A kind of preparation method and expanded polypropylene of fire-retardant low thermally conductive expanded polypropylene |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082953A (en) * | 2017-05-05 | 2017-08-22 | 衡水兴洲新材料有限公司 | Inhale ripple, guided wave PP foam material and preparation method thereof |
| CN107383636A (en) * | 2017-08-22 | 2017-11-24 | 中国科学院长春应用化学研究所 | A kind of low thermal conductivity expanded particle and preparation method thereof |
| CN108250577A (en) * | 2018-01-17 | 2018-07-06 | 杭州汉克斯隔音技术工程有限公司 | A kind of expanded polypropylene beads and its preparation process of fire-retardant low heat conduction |
-
2018
- 2018-11-27 CN CN201811428948.1A patent/CN109836700A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082953A (en) * | 2017-05-05 | 2017-08-22 | 衡水兴洲新材料有限公司 | Inhale ripple, guided wave PP foam material and preparation method thereof |
| CN107383636A (en) * | 2017-08-22 | 2017-11-24 | 中国科学院长春应用化学研究所 | A kind of low thermal conductivity expanded particle and preparation method thereof |
| CN108250577A (en) * | 2018-01-17 | 2018-07-06 | 杭州汉克斯隔音技术工程有限公司 | A kind of expanded polypropylene beads and its preparation process of fire-retardant low heat conduction |
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