CN105566721B - A kind of high temperature resistant XPE foams and preparation method thereof - Google Patents

A kind of high temperature resistant XPE foams and preparation method thereof Download PDF

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CN105566721B
CN105566721B CN201510738587.0A CN201510738587A CN105566721B CN 105566721 B CN105566721 B CN 105566721B CN 201510738587 A CN201510738587 A CN 201510738587A CN 105566721 B CN105566721 B CN 105566721B
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foaming
high temperature
temperature resistant
ldpe
density polyethylene
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CN105566721A (en
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范宇
郭俊杰
王明蕉
杨鸿昌
李志刚
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Shenzhen Changyuan Tefa Technology Co Ltd
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Shenzhen Changyuan Tefa Technology Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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    • 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
    • C08J9/06—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 chemical blowing agent
    • C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C08J2323/06—Polyethene
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    • 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
    • C08J2423/06—Polyethene
    • 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
    • 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
    • C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
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    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • 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
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    • 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
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • 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)

Abstract

The present invention provides a kind of high temperature resistant XPE foams and preparation method thereof, by weight percentage, including 20 30% HDPE, 5 20% LLDPE, 3 10% EPDM, 0.25 0.7% BIPB, 26 67% LDPE, foaming agent 8 10%.Advantageous effect is：1, by selecting the higher crosslinking agent B IPB of decomposition temperature, so that it is granulated, is not easily decomposed in extrusion, ensure the uniformity of product vulcanization.2, major ingredient switchs to the formula system that high density polyethylene (HDPE), linear low density polyethylene, low density polyethylene (LDPE) are blended by traditional low density polyethylene (LDPE), improves the heat resistance of material, mechanical property, impact property, hardness.3, by the method that successively repeatedly processing is blended several times, the compatibility of different kinds material is improved.4, in air hose forming process, shaping efficiency is high, and the hot plate welding tear force duration is longer, and physical life is high.

Description

A kind of high temperature resistant XPE foams and preparation method thereof
Technical field
The present invention relates to a kind of high temperature resistant XPE foams and preparation method thereof.
Background technology
XPE(Chemical crosslinked polyethylene foam):Processes for chemically crosslinked polyethylene foam sheet, should Product is that chemical cross-linking agent and foaming agent, manufactured polymeric foamed material, tool is added after mixing polyethylene with various fillers Have that good mechanical property, remarkable heat-insulated and sound insulation value, cheap, easy secondary operation molding, environmental protection, can to assign its good The flex foam of good flame retardant property is widely used in automotive trim, Leisure Sport, tourism supplies, toy for children, medical treatment guarantor The daily general merchandise industries such as strong and packaging, freezing, building, decoration.
2014, Chinese automobile production and marketing broke through 23,720,000 and 23,490,000, wherein passenger car sales volume 19,700,000 respectively, Continue to be sure to occupy global maximum automobile market.Although since last year market speedup is fallen after rise, associated mechanisms prediction, in 2015 The opportunity that state's car market high speed increases still has.The fast development of auto industry will give whole industrial chain to bring huge commercial opportunities With influence, 2015, China's car ownership was up to 1.5 hundred million, and under this huge scale of construction, automobile market is undoubtedly one There is the blue sea market field of great potential.
Around automobile engine, requirement of all kinds of car ducts to heatproof, insulation it is harsh, common XPE foams reach Less than its performance requirement；And traditional EVA foams, the environment-friendly type of polyurethane foam, polystyrene foam cannot reach requirement, have Peculiar smell is not easily recycled utilization, while thermal stability does not reach requirement yet；Although and XPE foam prices are relatively cheap, green ring It protects, but its heat resistance is also insufficient, for heat resistance no more than 120 DEG C, dimensional stability is poor, limits its application range.
The main method of the prior art is：1. respectively by azodicarbonamide (AC) original powder by the way of internally mix, granulation, Cumyl peroxide (DCP) is prepared into AC master batches, DCP master batches with low density polyethylene (LDPE) (LDPE)；2. then by this master batch It is molded with LDPE Single screw extrusions, tri-roll press machine；3. sheet material after molding is entered the horizontal foaming furnace of combustion type, level foaming Stove is divided into two sections, is referred to as preheating section, foaming section, between 145-175 °, the temperature for the section that foams exists the temperature of preheating section Between 190-230 °, heating is all made of aerodynamic heat transfer.
Common XPE foams have the following disadvantages：
1：The high temperature resistance of common XPE foams is insufficient；
2：Conventional XPE foams are heat-shrinked larger；
3：The decomposition temperature of common cross-linking agent is too low, and degradation is easy in extrusion；
4：Conventional XPE foams tensile strength and hardness are smaller；
5：Conventional XPE is easy cracking in forming process；
6：Air duct hot plate welding tear force is smaller, and the duration is short, and service life is short.
Invention content
In order to solve the above technical problems, a kind of high temperature resistant XPE foams of present invention offer and preparation method thereof.
1. product development principle
By mixer by major ingredient, auxiliary material, AC foaming agents, change surname material and crosslinking agent and be blended and be granulated, then use single spiral shell Bar extruder squeezes out coiled material molding, horizontal stove foaming, and foaming agent (azodicarbonamide), which decomposes, generates gas so as to cause plastic cement Master slice foams, and generates XPE foams；The Formula Development for carrying out high temperature resistant XPE foams on this basis, determines major ingredient, foaming agent, changes Property material, special auxiliary agent etc..
2. the development of product formula and technique
The selection of 2.1 raw material
For conventional low density polyethylene (LDPE) since fusing point is low, mechanical strength is small, cannot reach the requirement of high temperature resistant products, because The suitable high density polyethylene (HDPE), linear low density polyethylene is selected to be blended with low-density, to reach heatproof, mechanical property It is required that；High density polyethylene (HDPE), linea low density, low density polyethylene (LDPE) type are determined, in order to improve curability, the foam of material Shock resistance, add a certain proportion of EPDM and be modified, also reach temperature under the conditions of 120 DEG C, longitudinally varying rate after aging Less than 5%, cross directional variations rate is less than 2% after aging, and thickness, mass change are less than 2% after aging, as a result of high density Polyethylene raw material, melting temperature is higher, and general DCP cannot meet manufacturing technique requirent, therefore we select one kind novel Crosslinking agent (dual-tert-butyl peroxy isopropyl base benzene, BIPB), decompose 10 DEG C of decomposition temperature ratio DCP high, crosslinked efficiency is also more It is high.
2.2 product formula
By weight percentage, including：The HDPE (high density polyethylene (HDPE)) of 20-30%, the linea low density of 5-20% (LLDPE), BIPB (crosslinking agent), the LDPE of 26-67% of the EPDM (ethylene propylene diene rubber) of 3-10%, 0.25-0.7% are (low Density polyethylene), foaming agent 8-10%.The foaming agent uses azodicarbonamide.
3. the production technology of high temperature resistant XPE foams
The formula and processing technology of high temperature resistant XPE provided by the invention, production procedure are as shown in Figure 1.
3.1. influence of the mixing granulator technique to foamed products performance
The proportioning of HDPE and LLDPE directly determines the heatproof, weatherability, thermal dimensional stability of product, LLDPE, HDPE, EPDM, crosslinking agent, foaming agent dispersity directly affect foamed products uniform foam cell, fine and closely woven degree.In order to realize various masters The homogeneous blend of material, auxiliary material, is blended granulation according to the ratio by HDPE and LLDPE first, this master batch is high temperature resistant master batch, then by it Master batch with foaming agent, EPDM carries out that producing foamed master batch is blended；Since crosslinking agent additive amount is seldom, the quality of dispersion is directly certainly The cell uniformity of fixed output quota product, therefore using first by crosslinking agent and the granulation of low density polyethylene (LDPE) internally mix；Contain C=in EPDM raw materials C double bonds can play the vulcanization of product facilitation, therefore the dispersion quality of EPDM also determines the uniformity of product vulcanization, To determine the cell uniformity of product.
3.2, master slice extruding-out process
The geometric dimension of foaming coiled (master slice), superficial appearance substantially determine the width of final foamed products, thickness, Apparent mass, technological condition are temperature, rotating speed, head pressure, mouth mold gap, and the selection of various technological parameters will be in material Ensure that master slice plasticizing is uniform, thickness is uniform, surface is smooth, internal stress is uniform under the premise of foaming agent is Undec.Theoretically, Master slice thickness d0Correspondence is between product thickness d1(n is coefficient of foaming), wide association is also similar.But In actual production since there are internal stress for master slice, master slice is wide, thickness will carry out amendment appropriate It corrects；Cause After master slice is heated in the horizontal foaming furnace of combustion type in foaming process, master slice is wide under interior stress, thickness increases, length Shorten, product specification size is influenced after foaming；So the presence of internal stress influences product size changing rule in foaming process It is very big；In addition the presence of internal stress can cause the product in foaming process to crimp, adhesion, so must eliminate in master slice as possible Internal stress.To eliminate internal stress, in extrusion die heater is installed at three roller of extruder, keeps coolant water temperature at three rollers constant In a temperature, after such master slice discharges at extruding machine mold die orifice, biography is guided in three roller cooling procedures will not be in acute cold generation Stress；Concrete technology is as follows：Including following steps：
Step A:It imports in vertical screw blender and stirs evenly according to the ratio according to the formula；
Step B:The raw material stirred evenly is poured into single screw extrusion machine and is squeezed out；
Step C:By extrusion sheet by three-roller calendaring, it is cooled and shaped, then winds.
Preferably, in the step B, in single screw extrusion machine, there are six heating zone, each area's temperature difference for extrusion zone setting For：117 ± 10 DEG C, 118 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 118 ± 10 DEG C, Ji Boqu：110±10 DEG C, 110 ± 10 DEG C of flange, mold is divided into three heating zones, and each area's temperature is 125 ± 10 DEG C.
Wherein, the region that Ji Boqu is connected between mold and screw rod.
Preferably, in the step 2, extruded velocity is that 15-25 turns/min, extrusion neck ring mold 0.5-3.0mm.
Preferably, in the foam process of the step 6,140-190 DEG C of preheating section temperature, 190-240 DEG C of foaming section temperature, Guipure speed 2.0-3.5m/min.
3.3, foam process
The variation of high temperature resistant XPE foam foaming parameters, level foaming are studied on XPE foam foam process horizontal bases Stove preheating section (secondary high temperature section) temperature, foaming section (high temperature section) temperature, mesh belt transmission speed, speed and the mother for drawing chill roll The successional relationship of piece, foam product abscess, apparent mass, product；Determine different multiplying, different master slice thickness foaming furnace Parameters relationship, and foamed by the product of frothing test various specifications, determine required hair in products of different specifications formula The content of infusion and blowing promotor.140-190 DEG C of preheating section temperature, 190-240 DEG C of foaming section temperature, guipure speed 2.0- 3.5m/min。
The beneficial effects of the invention are as follows：
1, by selecting the higher crosslinking agent B IPB of decomposition temperature, so that it is granulated, is not easily decomposed in extrusion, ensure production The uniformity of product vulcanization；The curability of material is not only improved by adding EPDM, is reduced content of crosslinking agent, is also improved material The toughness of material is conducive to high temperature resistant XPE foams and is not broken during hot-forming, not broken.
2, major ingredient switchs to high density polyethylene (HDPE), linear low density polyethylene, low-density by traditional low density polyethylene (LDPE) and gathers The formula system that ethylene is blended, improves the heat resistance of material, mechanical property, impact property, hardness.
3, by the method that successively repeatedly processing is blended several times, the compatibility of different kinds material is improved.
4, such material is in air hose forming process, and shaping efficiency is high, and the hot plate welding tear force duration is longer, real With service life height.
Description of the drawings
Fig. 1 is the flow sheet of high temperature resistant XPE provided by the invention.
Specific implementation mode
The preferably embodiment of the present invention is described in further detail below：
Embodiment 1
High temperature resistant XPE foams are by weight in the present embodiment：10% EPDM, 30% HDPE, 6% crosslinking agent (BIPB), 0.25% foaming agent and 10% LLDPE, 43.75%LDPE, foaming agent use azodicarbonamide.
Preparation method is as follows：
Step 1：HDPE, LLDPE, LDPE are granulated by twin-screw, prepare high temperature resistant master batch；
Step 2：High temperature resistant master batch and foaming agent are prepared into foaming master batch by internally mix, Single screw extrusion granulation, it will BIPB and LDPE prepares crosslinking agent master batch by internally mix, Single screw extrusion granulation；
Step 3:It imports in vertical screw blender and stirs evenly according to the ratio according to the formula；
Step 4:The raw material stirred evenly is poured into single screw extrusion machine and is squeezed out；Each area's temperature is respectively：117±10 DEG C, 118 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 118 ± 10 DEG C, Ji Boqu：110 ± 10 DEG C, flange 110 ± 10 DEG C, mold is divided into three heating zones, and each area's temperature is 125 ± 10 DEG C, and extruded velocity is 15 turns/min, extrusion Mould 0.5mm.
Step 5:By extrusion sheet by three-roller calendaring, it is cooled and shaped, then winds.
Step 6：The sheet material squeezed out is pulled into horizontal foaming furnace by steel type guipure, foaming, cooling and shaping, High temperature resistant XPE foam coiled materials are prepared in winding.140 DEG C of preheating section temperature, 190 DEG C of foaming section temperature, guipure speed 2.0m/min.
Heatproof, the weatherability for improving foam, so as to improve the dimensional stability of foam, according to ISTA testing standards (120 22h is placed under the conditions of DEG C), in specified maximum changing range, test is made to its dimensional stability, data are as shown in table 1：
Table 1
Embodiment 2
High temperature resistant XPE foams are by weight：5% EPDM and 20% HDPE, 9% crosslinking agent (BIPB), 0.7% Foaming agent, 20% LLDPE, 45.3%LDPE, foaming agent use azodicarbonamide.
Step 1：HDPE, LLDPE, LDPE are granulated by twin-screw, prepare high temperature resistant master batch；
Step 2：High temperature resistant master batch and foaming agent are prepared into foaming master batch by internally mix, Single screw extrusion granulation, it will BIPB and LDPE prepares crosslinking agent master batch by internally mix, Single screw extrusion granulation；
Step 3:It imports in vertical screw blender and stirs evenly according to the ratio according to the formula；
Step 4:The raw material stirred evenly is poured into single screw extrusion machine and is squeezed out；Each area's temperature is respectively：117±10 DEG C, 118 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 118 ± 10 DEG C, Ji Boqu：110 ± 10 DEG C, flange 110 ± 10 DEG C, mold is divided into three heating zones, and each area's temperature is 125 ± 10 DEG C, and extruded velocity is 25 turns/min, extrusion Mould 3.0mm.
Step 5:By extrusion sheet by three-roller calendaring, it is cooled and shaped, then winds.
Step 6：The sheet material squeezed out is pulled into horizontal foaming furnace by steel type guipure, foaming, cooling and shaping, High temperature resistant XPE foam coiled materials, 160 DEG C of preheating section temperature, 200 DEG C of foaming section temperature, guipure speed 3m/min are prepared in winding.
Heatproof, the weatherability for improving foam, so as to improve the dimensional stability of foam, according to (120 DEG C of ISTA testing standards Under the conditions of place 22h), in specified maximum changing range, test is made to its dimensional stability, data are as shown in table 2：
Table 2
Embodiment 3
High temperature resistant XPE foams by weight, including：3% EPDM and 30% HDPE, 0.5% crosslinking agent (BIPB), 10% foaming agent, 15% LLDPE, 41.5%LDPE, foaming agent use azodicarbonamide.
Step 1：HDPE, LLDPE, LDPE are granulated by twin-screw, prepare high temperature resistant master batch；
Step 2：High temperature resistant master batch and foaming agent are prepared into foaming master batch by internally mix, Single screw extrusion granulation, it will BIPB and LDPE prepares crosslinking agent master batch by internally mix, Single screw extrusion granulation；
Step 3:It imports in vertical screw blender and stirs evenly according to the ratio according to the formula；
Step 4:The raw material stirred evenly is poured into single screw extrusion machine and is squeezed out；Each area's temperature is respectively：117±10 DEG C, 118 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 118 ± 10 DEG C, Ji Boqu：110 ± 10 DEG C, flange 110 ± 10 DEG C, mold is divided into three heating zones, and each area's temperature is 125 ± 10 DEG C, and extruded velocity is 20 turns/min, extrusion Mould 2mm.
Step 5:By extrusion sheet by three-roller calendaring, it is cooled and shaped, then winds.
Step 6：The sheet material squeezed out is pulled into horizontal foaming furnace by steel type guipure, foaming, cooling and shaping, High temperature resistant XPE foams, 190 DEG C of preheating section temperature, 240 DEG C of foaming section temperature, guipure speed 3.5m/min are prepared in winding.
Heatproof, the weatherability for improving foam, so as to improve the dimensional stability of foam, according to ISTA testing standards (120 22h is placed under the conditions of DEG C), in specified maximum changing range, test is made to its dimensional stability, data are as shown in table 3：
Table 3
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's Protection domain.

Claims (1)

1. a kind of method preparing high temperature resistant XPE foams, which is characterized in that high temperature resistant X PE foams include：By weight percentage： HD PE, 20 the 5- %LLDPE of 20-30 %, the EPDM of 3-10%, the LDPE of BIPB, 26-67% of 0 .25-0 .7%, foaming agent 8-10%；The method includes following steps：
Step 1：HDPE, LLDPE, LDPE are granulated by twin-screw, prepare high temperature resistant master batch；
Step 2：High temperature resistant master batch and foaming agent are prepared into foaming master batch by mixing, Single screw extrusion granulation, by BIPB with LDPE prepares crosslinking agent master batch by mixing, Single screw extrusion granulation；
Step 3:It imports in vertical screw blender and stirs evenly according to the ratio according to the formula；
Step 4:The raw material stirred evenly is poured into single screw extrusion machine and is squeezed out;
Step 5:By extrusion sheet by three-roller calendaring, it is cooled and shaped, then winds；
Step 6：The sheet material squeezed out is pulled into horizontal foaming furnace, foaming, cooling and shaping, winding by steel type guipure Prepare high temperature resistant XPE foam coiled materials；In the step 2, in single screw extrusion machine, there are six heating zones for extrusion zone setting, respectively Area's temperature is respectively：117 ± 10 DEG C, 118 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 120 ± 10 DEG C, 118 ± 10 DEG C, Ji Boqu：110 ± 10 DEG C, 110 ± 10 DEG C of flange, mold is divided into three heating zones, and each area's temperature is 125 ± 10 DEG C； In the foam process of the step 6,140-190 DEG C of preheating section temperature, 190-240 DEG C of foaming section temperature, 2 .0-3 of guipure speed .5m/min；The foaming agent uses azodicarbonamide；In the step 2, extruded velocity is that 15-25 turns/min, extrusion neck ring mold 0 .5-3 .0mm；Wherein, the region that Ji Boqu is connected between mold and screw rod.
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