CN109517262A - A kind of supercritical fluid foaming method of whole process pressure maintaining - Google Patents
A kind of supercritical fluid foaming method of whole process pressure maintaining Download PDFInfo
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- CN109517262A CN109517262A CN201811468345.4A CN201811468345A CN109517262A CN 109517262 A CN109517262 A CN 109517262A CN 201811468345 A CN201811468345 A CN 201811468345A CN 109517262 A CN109517262 A CN 109517262A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08J2491/06—Waxes
Abstract
A kind of supercritical fluid foaming method of whole process pressure maintaining, comprising: import particles in storage tank；Supercritical fluid is injected in storage tank, particles are permeated；The particles of osmotic fluid are delivered to spare in surge tank, if desired progress injection foaming molding, the injection mold that the particles of osmotic fluid in surge tank are delivered to injection molding machine is subjected to injection foaming molding；If desired foam shaping by extrusion is carried out, then the expects pipe that the particles of osmotic fluid in surge tank are delivered to extruder is subjected to foam shaping by extrusion.Above-mentioned supercritical fluid foaming method can enable the particles of osmotic fluid persistently carry out continuous production supplied to molding equipment, and can get integrally formed foamed material, high production efficiency, and production cost is low.
Description
Technical field
The present invention relates to foam process, more particularly, to a kind of supercritical fluid foaming method of whole pressure maintaining.
Background technique
In foamed forming process or foamed polymer material, by the addition of physical blowing agent or chemical foaming agent with
Reaction, forms honeycomb or vesicular texture.The basic step of foaming be to be formed complex, complex growth or expand with
And the stabilization of complex.
Mucell technology is established by Trexcel company, the U.S., and technology is will to manufacture the equipment connection of supercritical fluid
To the expects pipe of injection molding machine or extruder, supercritical fluid is injected in the expects pipe of injection molding machine or extruder and is existed with high molecular material
It is mixed in expects pipe, then the macromolecule molten plastic for mixing supercritical fluid is molded into plastic mould and is molded
Molding or extrusion molding, to obtain light-weighted injection-molded finished or extrusion finished product.
Above method production foamed material usually has the disadvantage that: 1) particles time of penetration is too long, can not be fed in time
Lead to not continuous production to molding equipment, causes that production efficiency is low, high production cost；2) cell size be unevenly distributed, specific gravity
Higher (about 0.4 or more), elasticity is low, sense of touch is poor, appearance has the problems such as gas trace is not flat and smooth enough, is not suitable for system
Make the products such as footwear material and the ground cushion or the sports equipment that have buffering effect.
Summary of the invention
The technical scheme is that for above situation, a kind of whole pressure maintaining is provided to solve the above-mentioned problems
Supercritical fluid foaming method, the foaming method the following steps are included:
Step A, particles are imported in storage tank；
Step B, supercritical fluid is injected in storage tank, permeates particles；
Step C, the particles of osmotic fluid are delivered to spare in surge tank, if desired progress injection foaming molding, then
Step D is carried out, foam shaping by extrusion is if desired carried out, then carries out step E；
Step D, by the particles of osmotic fluid in surge tank be delivered to injection molding machine injection mold carry out injection foaming at
Type；
Step E, the expects pipe that the particles of osmotic fluid in surge tank are delivered to extruder is subjected to foam shaping by extrusion.
Further, in the step B, infiltration is pressure is 7-70MPa, to carry out 0.5-8 at 35-140 DEG C of temperature small
When.
Further, the supercritical fluid include carbon dioxide, water, methane, ethane, ethylene, propylene, methanol, ethyl alcohol,
One of acetone, nitrogen are a variety of.
Further, the pressure of surge tank is 7-70Mpa, and temperature is 0-100 DEG C.
Further, particles are polyolefine material, in the step D, be crosslinked in injection foaming molding anti-
It answers, the temperature of injection mold is 140-200 DEG C, pressure 7-70Mpa, and the injection foaming time is 60-950 seconds.
Further, polyolefine material include vinyl-vinyl acetate copolymer (EVA), it is polyolefin elastomer (POE), low
One of density polyethylene (LDPE), ethylene propylene diene rubber (EPDM) are a variety of.
Further, the polyolefin composition material is also doped with one of crosslinking agent, filler, auxiliary agent or a variety of,
Crosslinking agent includes one of cumyl peroxide (DCP), dual-tert-butyl dicumyl peroxide (BIPB) or a variety of；
Filler includes one of calcium carbonate, talcum powder, Zinc Oxide, titanium dioxide or a variety of；Auxiliary agent includes paraffin, in stearic acid
It is one or more.
Further, in terms of by the parts by weight of polyolefine material for 100phr, the amount of crosslinking agent is 0.15phr -1.1phr, institute
The amount for stating filler is 30phr hereinafter, the amount of the auxiliary agent is 10phr or less.
Further, particles are thermoplastic elastomer (TPE), in the step D, in injection foaming molding directly to injection molding
Mold projects the particles of osmotic fluid, and the temperature of injection mold is 10-50 DEG C, pressure 7-70Mpa, and the injection foaming time is
50-120 seconds.
Further, thermoplastic elastomer (TPE) includes thermoplastic polyurethane (TPU), thermoplastic polyester elastomer (TPEE), block
One of polyetheramide elastomeric body (Pebax) is a variety of.
After adopting the above technical scheme, effect of the invention is: 1, can get integrally formed foamed material, be not required to two
Secondary processing sizing；2, low-gravity foamed product (ratio weighs about 0.35 or less) can be applied to ground cushion, footwear material, sports equipment, packaging
The fields such as material；3, special-shaped foamed material complies fully with environment-protecting and non-poisonous, the recyclable environmental-friendly trend trend recycled；
4, the particles of osmotic fluid is enable persistently to carry out continuous production supplied to molding equipment.
Specific embodiment
Below by embodiment to technical solution of the present invention further description:
The present invention provides a kind of supercritical fluid foaming method of whole pressure maintaining, the foaming method the following steps are included:
Step A, particles are imported in storage tank；
Step B, supercritical fluid is injected in storage tank, permeates particles；
Step C, the particles of osmotic fluid are delivered to spare in surge tank, if desired progress injection foaming molding, then
Step D is carried out, foam shaping by extrusion is if desired carried out, then carries out step E；
Step D, by the particles of osmotic fluid in surge tank be delivered to injection molding machine injection mold carry out injection foaming at
Type；
Step E, the expects pipe that the particles of osmotic fluid in surge tank are delivered to extruder is subjected to foam shaping by extrusion.
Wherein, storage tank, surge tank and injection molding machine or extruder are linked by pressure-maintaining and heat-preservation pipeline, and storage tank delays
It rushes tank, injection molding machine, extruder and maintains and carry out individual temperature control under identical pressure.
Import particles-
Particles are imported in storage tank.
The particles of supercritical fluid foaming method for use in the present invention include polyolefine material and thermoplastic elastic
Body.
Polyolefine material may include vinyl-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), low close
Spend one of polyethylene (LDPE), ethylene propylene diene rubber (EPDM) or a variety of mixtures.For example, polyolefine material can be with
For EVA, wherein the molar content of vinyl acetate is 5%-40%, or can be the mixture of EVA/POE, mixing proportion
It is 100/0.1~0.1/100, or can is the blend of polyolefine material and rubber material, such as EVA/POE/EPDM
(ethylene propylene diene rubber) blend, mixing proportion are 100/0.1/0.1~0.1/100/20.
Polyolefine material can also be doped with one of crosslinking agent, filler, auxiliary agent or a variety of.Crosslinking agent can be with
Poly- hydrocarbon resins phase separation, forms bridged bond between polymer molecular chain, becomes the insoluble substance of three-dimensional structure；Filler
Material performance can be improved, energy increase-volume, weight gain reduce the solid matter of the cost of material；The stream of main material can be improved in auxiliary agent
Dynamic property.Wherein, in terms of by the parts by weight of polyolefine material for 100phr, the amount of crosslinking agent can be 0.15phr -1.1phr, preferably
0.25phr-1.0phr, the amount of filler can be 30phr hereinafter, the amount of auxiliary agent can be 10phr or less.
Crosslinking agent may include peroxide, for example including cumyl peroxide (DCP), dual-tert-butyl peroxidating two
One of cumene (BIPB) is a variety of.
Filler may include one of calcium carbonate, talcum powder, Zinc Oxide, titanium dioxide or a variety of.
Auxiliary agent may include one of paraffin, stearic acid or a variety of.
Thermoplastic elastomer (TPE) may include that thermoplastic polyurethane (TPU), thermoplastic polyester elastomer (TPEE), block are poly-
One of ether amide elastomer (Pebax) or a variety of mixtures.
Permeate particles-
Supercritical fluid is injected in storage tank, particles are permeated.
Supercritical fluid may include carbon dioxide, water, methane, ethane, ethylene, propylene, methanol, ethyl alcohol, acetone, nitrogen
One of gas is a variety of.
It is carried out 0.5-8 hours at infiltration can be 7-70MPa in pressure, temperature is 35-140 DEG C.Specifically, for poly-
Compositions of olefines material, infiltration carry out 1-8 hours in the case where pressure is 7-70MPa, temperature is 30-80 DEG C；For thermoplastic elastic
Body, infiltration carry out 1-8 hours in the case where pressure is 7-70MPa, temperature is 50-130 DEG C.
In the particles of resulting supercritical fluid infiltration, the supercritical fluid infiltration capacity of particles is by weight
1-10%.
It is delivered to surge tank-
The particles of osmotic fluid are delivered to spare in surge tank.
Wherein, the pressure of surge tank is 7-70Mpa, and temperature is 0-100 DEG C.Specifically, for polyolefin composition material
Material, the pressure of surge tank are 7-70Mpa, and temperature is 0-80 DEG C；For thermoplastic elastomer (TPE), the pressure of surge tank is 7-
70Mpa, temperature are 0-100 DEG C.
Surge tank is to provide the continuous feeding deposit of the particles of osmotic fluid, to overcome micelle infiltrating time too long, nothing
The shortcomings that method is fed into time in molding equipment (i.e. injection molding machine or extruder), leads to not continuous production, makes osmotic fluid
Particles be able to persistently supplied to molding equipment carry out continuous production.
Injection foaming molding-
The injection mold that the particles of osmotic fluid in surge tank are delivered to injection molding machine is subjected to injection foaming molding.
If particles are polyolefin composition material, cross-linking reaction is carried out in injection foaming molding, while will injection molding
Mold maintains the pressure maintaining condition of high temperature；If particles are thermoplastic elastomer (TPE), do not need to carry out cross-linking reaction, be sent out in injection molding
The particles of osmotic fluid are directly projected when soaking type to injection mold.
Specifically, if desired carrying out cross-linking reaction, then the temperature of injection mold is 140-200 DEG C, pressure 7-70Mpa,
The injection foaming time (or crosslinking time) is 60-950 seconds.If not needing to carry out cross-linking reaction, the temperature of injection mold is
10-50 DEG C, pressure 7-70Mpa, the injection foaming time is 50-120 seconds.
Foam shaping by extrusion-
The expects pipe that the particles of osmotic fluid in surge tank are delivered to extruder is subjected to foam shaping by extrusion.
The temperature of expects pipe is 140-200 DEG C, pressure 7-70Mpa.
Foaming product-
The aperture size of foaming product of the invention is 0.1-3mm, specific gravity 0.03-0.30g/cm3。
Foaming product of the invention carries out 30,000 iterative cycles anti-fatigue tests under 10-80kg loading, and size is steady
It is qualitative than traditional EVA chemical blowing material lift 30%.
Foaming product of the invention has 50% or more the rebound measured according to ASTM D2632 (vertical falling sphere rebound)
Performance, and in the sustainment rate of 10-60 days vertical falling sphere ballistic properties than traditional EVA chemical blowing material lift 30%.
Foaming product of the invention can be used for ground cushion, footwear material, sports equipment, toy or packaging material.Wherein, footwear material is sent out
Brewage specific gravity is 0.05-0.3g/cm3, aperture size 0.01-3mm, with 50% or more measured according to ASTM D2632
Ballistic properties；Ground cushion foaming product specific gravity is 0.03-0.2g/cm3, aperture size 0.01-3mm, with according to ASTM
50% or more ballistic properties of D2632 measurement.
Present invention obtains the flat and smooth foamed materials of low-gravity, environment-protecting and non-poisonous, excellent spring, appearance.This hair
It is bright to make the plastic cement of osmotic fluid using surge tank without carrying out secondary operation using one step foaming molding acquisition final product
Grain is able to persistently carry out continuous production supplied to molding equipment, can achieve the purpose that reduce manpower simultaneously and save the energy.
Embodiment 1
By the EVA of 100phr (platform moulds EVA7470, the molar content of vinyl acetate be 26%), the calcium carbonate of 1phr,
The paraffin of 0.5phr and the DCP of 0.5phr are imported in storage tank, mix 12min under 50 DEG C and 7Mpa pressure condition.Injection two
Carbonoxide supercritical fluid maintains 2 hours at temperature 50 C, pressure 40Mpa, obtains the particles of supercritical fluid infiltration
(prefoam multiplying power is 1.5 or less), supercritical fluid infiltration capacity is 10% by weight.Above-mentioned supercritical fluid is infiltrated
Particles are delivered to spare in surge tank.When foaming, the particles of osmotic fluid in surge tank are delivered to the injection molding of injection molding machine
Cross-linking reaction is carried out in mold, the temperature of injection mold is 140-200 DEG C, pressure 7-70Mpa, crosslinking time 60-950
Second, last injection foaming molding obtains the foaming product of the flat and smooth special-shaped finished product of appearance.
The cell diameter of the foaming product of finished product is measured microscopically with optics, and density of material is tested with specific gravity balance；Rebound
Performance is tested according to ASTM D2632: the standard taper steel ball of 28 ± 0.5g of quality is freely fallen in foam in 400mm height
It is tested on plastic sample, the maximum height of steel ball rebound and the ratio of height of fall are rebound percentage.
Specific gravity, cell diameter, the resilience performance of the foaming product of the finished product be respectively 0.15-0.17,0.8-2.5mm and
55%.
Embodiment 2
In addition to mixing proportion be 60/40 EVA/POE mixture (wherein the molar content of the vinyl acetate of EVA is
26%, and POE by Dow Chemical 8150 models POE) replace except EVA, using program same as Example 1,
Obtain the foaming product of finished product.
Specific gravity, cell diameter, the resilience performance of the foaming product of the finished product are respectively 0.13,0.5-2mm and 60%.
Embodiment 3
(wherein the molar content of the vinyl acetate of EVA is the EVA/POE mixture for being 60/40 with mixing proportion
26%, and POE by Dow Chemical 8150 models POE) replace EVA, with supercritical nitrogen fluid replace carbon dioxide
Except fluid, using program same as Example 1, the foaming product of finished product is obtained.
Specific gravity, cell diameter, the resilience performance of the foaming product of the finished product are respectively 0.15,0.5-2.5mm and 58%.
Embodiment 4
In addition to replace EVA composition with the TPU of the 85AU10 model of Cohan wound company and omit mixing and cross-linking step it
Outside, using program same as Example 1, the foaming product of finished product is obtained.
Specific gravity, cell diameter, the resilience performance of the foaming product of the finished product are respectively 0.28,0.5-1.5mm and 55%.
Comparative example 1
TPU foamed product, material tube of injection machine temperature are made using supercritical fluid foaming machine with traditional Mucell technology
210 DEG C, 30 DEG C of mold temperature, supercritical nitrogen fluid is injected to the metering section and TPU melt body of injection molding machine using Mucell equipment
Mixing, is then molded into die for molding for the TPU molten mass that this fluid mixes, supercritical fluid is in mold cavity in TPU
The inside of melt body and external gasification simultaneously generate inner cell, obtain injection foaming and size is with die cavity size but there is gas trace on surface
Rough TPU product, specific gravity, cell diameter, the resilience performance of foamed product be respectively 0.4-0.55,0.8-2mm and
50%.
Comparative example 2
Other than prefoam ratio is greater than 1.6 after supercritical fluid infiltration, using program same as Example 1, obtain
The foaming product of finished product, specific gravity, cell diameter, the resilience performance of foamed product are respectively 0.22,0.5-1.7mm and 50%.
Comparative example 3
Other than the crosslink agent DCP in the formula of embodiment 1 is changed to 1.25phr, other programs are the same as embodiment 1, foaming
Specific gravity, cell diameter, the resilience performance of finished product are respectively 0.32,0.2-0.8mm and 40%.
Comparative example 4
Other than the crosslink agent DCP in the formula of embodiment 1 is changed to 0.12phr, other programs are the same as embodiment 1, foaming
Specific gravity, cell diameter, the resilience performance of finished product are respectively 0.42,0.2-0.6mm and 35%.
Comparative example 5
Other than the crosslink agent DCP in the formula of embodiment 2 is changed to 0.12phr, other programs are the same as embodiment 2, foaming
Specific gravity, cell diameter, the resilience performance of finished product are respectively 0.35,0.1-0.8mm and 42%.
Embodiment described above, only preferred embodiments of the invention, be not to limit practical range of the invention, therefore it is all
According to the equivalent change or modification that structure, feature and principle described in scope of the present invention patent is done, this hair should be included in
In bright patent claim.
Claims (10)
1. it is a kind of whole process pressure maintaining supercritical fluid foaming method, it is characterised in that: the foaming method the following steps are included:
Step A, particles are imported in storage tank；
Step B, supercritical fluid is injected in storage tank, permeates particles；
Step C, the particles of osmotic fluid are delivered to it is spare in surge tank, if desired carry out injection foaming molding, then carry out
If desired step D carries out foam shaping by extrusion, then carry out step E；
Step D, the injection mold that the particles of osmotic fluid in surge tank are delivered to injection molding machine is subjected to injection foaming molding；
Step E, the expects pipe that the particles of osmotic fluid in surge tank are delivered to extruder is subjected to foam shaping by extrusion.
2. the supercritical fluid foaming method of whole process pressure maintaining according to claim 1, it is characterised in that: in the step B
In, infiltration is 7-70MPa, carries out 0.5-8 hours at 35-140 DEG C of temperature in pressure.
3. the supercritical fluid foaming method of whole process pressure maintaining according to claim 1, it is characterised in that: the shooting flow
Body includes one of carbon dioxide, water, methane, ethane, ethylene, propylene, methanol, ethyl alcohol, acetone, nitrogen or a variety of.
4. the supercritical fluid foaming method of whole process pressure maintaining according to claim 1, it is characterised in that: the pressure of surge tank
For 7-70Mpa, temperature is 0-100 DEG C.
5. the supercritical fluid foaming method of whole process pressure maintaining according to claim 1 to 4, it is characterised in that: particles
Cross-linking reaction is carried out in injection foaming molding in the step D for polyolefine material, the temperature of injection mold is 140-
200 DEG C, pressure 7-70Mpa, the injection foaming time is 60-950 seconds.
6. according to the supercritical fluid foaming method of any whole pressure maintaining of claim 5, it is characterised in that: polyolefin material
Material includes vinyl-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), low density polyethylene (LDPE) (LDPE), ternary second
One of third rubber (EPDM) is a variety of.
7. the supercritical fluid foaming method of whole process pressure maintaining according to claim 6, it is characterised in that: the polyolefin group
Object material is closed also doped with one of crosslinking agent, filler, auxiliary agent or a variety of, and crosslinking agent includes cumyl peroxide
(DCP), one of dual-tert-butyl dicumyl peroxide (BIPB) or a variety of；Filler includes calcium carbonate, talcum powder, zinc
One of oxygen powder, titanium dioxide are a variety of；Auxiliary agent includes one of paraffin, stearic acid or a variety of.
8. the supercritical fluid foaming method of whole process pressure maintaining according to claim 7, it is characterised in that: with polyolefine material
Parts by weight be 100phr meter, the amount of crosslinking agent is 0.15phr -1.1phr, and the amount of the filler is 30phr hereinafter, described
The amount of auxiliary agent is 10phr or less.
9. the supercritical fluid foaming method of whole pressure maintaining described in -4 according to claim 1, it is characterised in that: particles are heat
Thermoplastic elastic directly projects the particles of osmotic fluid in injection foaming molding in the step D to injection mold,
The temperature of injection mold is 10-50 DEG C, pressure 7-70Mpa, and the injection foaming time is 50-120 seconds.
10. the supercritical fluid foaming method of whole process pressure maintaining according to claim 9, it is characterised in that: thermoplastic elastic
Body includes thermoplastic polyurethane (TPU), thermoplastic polyester elastomer (TPEE), in block polyetheramides elastomer (Pebax)
It is one or more.
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| CN110216958A (en) * | 2019-05-24 | 2019-09-10 | 华南理工大学 | A kind of resistance to multi-layer foam material as well and preparation method thereof for drawing pressure resistance of lower thermal conductivity |
| CN110539440A (en) * | 2019-09-02 | 2019-12-06 | 厦门市锋特新材料科技有限公司 | Foaming process of EVA injection molding piece |
| CN110539442A (en) * | 2019-09-02 | 2019-12-06 | 厦门市锋特新材料科技有限公司 | TPU particle foaming process |
| CN116079977A (en) * | 2023-01-12 | 2023-05-09 | 东莞海瑞斯新材料科技有限公司 | Feeding mechanism of mould pressing foaming machine for supercritical foaming material production |
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| CN110216958A (en) * | 2019-05-24 | 2019-09-10 | 华南理工大学 | A kind of resistance to multi-layer foam material as well and preparation method thereof for drawing pressure resistance of lower thermal conductivity |
| CN110216958B (en) * | 2019-05-24 | 2021-07-20 | 华南理工大学 | Low-thermal-conductivity tensile and pressure-resistant multilayer foaming material and preparation method thereof |
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| CN116079977B (en) * | 2023-01-12 | 2023-08-11 | 东莞海瑞斯新材料科技有限公司 | Feeding mechanism of mould pressing foaming machine for supercritical foaming material production |
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Application publication date: 20190326 |