CN105566721A - High-temperature-resistant XPE (chemical cross-linked polyethylene) foam and preparation method thereof - Google Patents
High-temperature-resistant XPE (chemical cross-linked polyethylene) foam and preparation method thereof Download PDFInfo
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Abstract
The invention provides high-temperature-resistant XPE (chemical cross-linked polyethylene) foam and a preparation method thereof. The foam comprises according to percent by weight: 20-30 % of HDPE (high-density polyethylene), 5-20 % of LLDPE (linear low density polyethylene), 3-10 % of EPDM (ethylene-propylene-diene monomer), 0.25-0.7 % of BIPB (bis(tert-butyldioxyisopropyl)benzene), 26-67 % of LDPE (low density polyethylene), and 8-10 % of a foaming agent. This foam has the advantages that the use of the cross-linking agent BIPB having a higher decomposition temperature makes it difficult to decompose in granulating and extruding processes and ensures product vulcanization uniformity; a main material, traditional low-density polyethylene, is replaced with a blended formulation system of high-density polyethylene, linear low-density polyethylene and low-density polyethylene, giving improvements in temperature resistance, mechanical properties, impact performance and hardness of materials; an improvement is given to the compatibility of various materials by using a successive multiple processing and blending method; forming efficiency of a forming process of an air duct is high, hot plate welding tear strength duration of the air duct is longer, and the practical life the air duct is long.
Description
Technical field
The present invention relates to a kind of high temperature resistant XPE foam and preparation method thereof.
Background technology
XPE (Chemicalcrosslinkedpolyethylenefoam): processes for chemically crosslinked polyethylene foam sheet, this product is after being mixed with various filler by polyethylene, add chemical cross-linking agent and whipping agent, the polymeric foamed material made, there is good mechanical property, remarkable heat insulation and sound-proofing properties, low price, easy secondary processing is shaping, environmental protection, the flex foam of its good flame-retardance energy can be given, be widely used in automotive trim, Leisure Sport, tourism supplies, toy for children, health care and packaging, freezing, building, the daily general merchandise industries such as decoration.
2014, Chinese automobile production and marketing broke through 2,372 ten thousand and 2,349 ten thousand respectively, wherein passenger car sales volume 1,970 ten thousand, continued to be sure to occupy global maximum automobile market.Although since last year market speedup falls after rise to some extent, associated mechanisms is predicted, the opportunity of Chinese car market high speed growth in 2015 still exists.The fast development of automotive industry brings huge commercial opportunities and impact, 2015 will to overall industrial chain, and China's automobile pollution will reach 1.5 hundred million, and under this huge scale of construction, automobile market is undoubtedly the blue sea market field that has great potential.
Around motor car engine, all kinds of car duct is harsh to the requirement of heatproof, heat insulating, and common XPE foam does not reach its performance requriements; And traditional EVA foam, polyurethane foam, the environment-friendly type of polystyrene foam can not reach requirement, has peculiar smell, not easy to be recycled, and thermostability does not reach requirement yet simultaneously; And although XPE foam price is relatively cheap, environmental protection, its heat resistance is also not enough, and heat resistance can not more than 120 DEG C, and dimensional stability is poor, limit its range of application.
The main method of prior art is: 1. the mode of employing internally mix, granulation is respectively by Cellmic C 121 (AC) former powder, and dicumyl peroxide (DCP) and Low Density Polyethylene (LDPE) are prepared into AC master batch, DCP master batch; Then 2. this master batch and LDPE Single screw extrusion, tri-roll press machine is shaping; 3. the sheet material after shaping is entered the horizontal foaming furnace of combustion type, horizontal foaming furnace is divided into two sections, is called preheating section, foaming section, and the temperature of preheating section is between 145-175 °, and the temperature of foaming section is between 190-230 °, and heating all adopts aerodynamic heat transfer.
There is following shortcoming in common XPE foam:
1: the resistance to elevated temperatures of common XPE foam is not enough;
2: the thermal contraction of conventional XPE foam is larger;
3: the decomposition temperature of common cross-linking agent is too low, easily degrades in extrusion;
4: conventional XPE foam tensile strength and hardness less;
5: conventional XPE easily ftractures in moulding process;
6: air channel hot plate welding tear force is less, and the time length is short, and work-ing life is short.
Summary of the invention
In order to solve above technical problem, the invention provides a kind of high temperature resistant XPE foam and preparation method thereof.
1. product development principle
By Banbury mixer by major ingredient, auxiliary material, AC whipping agent, change surname material and the blended granulation of linking agent, then single screw extrusion machine is adopted to extrude coiled material shaping, horizontal stove foams, and whipping agent (Cellmic C 121) decomposes generation gas thus causes plastic cement master slice to foam, and generates XPE foam; Carry out the Formula Development of high temperature resistant XPE foam on this basis, determine major ingredient, whipping agent, material modified, special auxiliary agent etc.
2. the development of formula for a product and technique
2.1 raw-material selections
Conventional Low Density Polyethylene due to fusing point low, mechanical strength is little, can not reach the requirement of high temperature resistant products, because it is blended to select suitable high density polyethylene(HDPE), linear low density polyethylene and low density to carry out, to reach the requirement of heatproof, mechanical property, determine high density polyethylene(HDPE), linea low density, Low Density Polyethylene kind, in order to improve the curability of material, the shock resistance of foam, add a certain proportion of EPDM modification, also temperature is reached under 120 DEG C of conditions, aging rear longitudinal velocity of variation is less than 5%, aging rear lateral variation rate is less than 2%, aging rear thickness, mass change is less than 2%, owing to have employed high density polyethylene(HDPE) raw material, its melt temperature is higher, general DCP can not meet manufacturing technique requirent, therefore we select a kind of novel linking agent (dual-tert-butyl peroxy isopropyl base benzene, BIPB), its decomposition decomposition temperature is higher than DCP 10 DEG C, crosslinked efficiency is also higher.
2.2 formula for a product
By weight percentage, comprise: the HDPE (high density polyethylene(HDPE)) of 20-30%, the linea low density (LLDPE) of 5-20%, the EPDM (terpolymer EP rubber) of 3-10%, the BIPB (linking agent) of 0.25-0.7%, the LDPE (Low Density Polyethylene) of 26-67%, whipping agent 8-10%.Described whipping agent adopts Cellmic C 121.
3. the production technique of high temperature resistant XPE foam
The formula of high temperature resistant XPE provided by the invention and complete processing, its Production Flow Chart as shown in Figure 1.
3.1. mixing granulator technique is on the impact of foamed products performance
The proportioning of HDPE and LLDPE directly determines heatproof, weathering resistance, the thermal dimensional stability of product, and the dispersion state of LLDPE, HDPE, EPDM, linking agent, whipping agent directly affects foamed products uniform foam cell, fine and closely woven degree.In order to realize various major ingredient, auxiliary material evenly blended, first by HDPE and LLDPE by the blended granulation of proportioning, this master batch is high temperature resistant master batch, then its master batch and whipping agent, EPDM is carried out blended producing foamed master batch; Because linking agent addition is little, the quality of its dispersion directly determines therefore to adopt by the cell uniformity of product first by linking agent and the granulation of Low Density Polyethylene internally mix; Containing C=C double bond in EPDM raw material, can play promoter action to the sulfuration of product, therefore the dispersion quality of EPDM also determines the homogeneity of product sulfuration, thus determines the cell uniformity of product.
3.2, master slice extruding-out process
The geometrical dimension of foaming coiled (master slice), superficial appearance determine width, thickness, the apparent mass of final foamed products substantially, technological condition is temperature, rotating speed, head pressure, mouth die clearance, and the selection of various processing parameter will ensure under the Undec prerequisite of material whipping agent that master slice plasticizing is even, thickness is even, smooth surface, internal stress are even.Theoretically, master slice thickness d
0and corresponding relation is between product thickness d1
(n is foam expansion), wide association is also similar.But because master slice exists internal stress in actual production, master slice is wide, thickness will carry out suitable correction
revise; Because of after in foaming process, master slice is heated in the horizontal foaming furnace of combustion type, under internal stress effect, wide, the thickness of master slice increases, and contraction in length, affects product specification size after foaming; So the existence of internal stress is very large on product size Changing Pattern impact in foaming process; The existence of internal stress in addition, can cause that the product in foaming process is curling, adhesion, so must eliminate the internal stress in master slice as far as possible.For eliminating internal stress, installing die heater, make three roller place coolant water temperatures constant in a temperature in extrusion at forcing machine three roller place, such master slice, after the place's discharging of extruding machine mold die orifice, passes that guide in three roller process of cooling can not acute cold generation internal stress; Concrete technology is as follows: comprise following step:
Steps A: stir by proportioning importing vertical screw stirrer according to described formula;
Step B: the raw material stirred is poured in single screw extrusion machine and extrudes;
Step C: by extrusion sheet by three-roller calendaring, cooling forming, then rolling.
Preferably, in described step B, in single screw extrusion machine, extrude district and be provided with six heating zone, each district 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, flange, mould is divided into three heating zone, and each district temperature is 125 ± 10 DEG C.
Wherein, Ji Boqu is the region be connected between mould with screw rod.
Preferably, in described step 2, extruded velocity is that 15-25 turns/min, extrusion neck ring mold 0.5-3.0mm.
Preferably, in the foam process of described step 6, preheating section temperature 140-190 DEG C, foaming section temperature 190-240 DEG C, guipure speed 2.0-3.5m/min.
3.3, foam process
XPE foam foam process horizontal base is studied the change of high temperature resistant XPE foam foaming parameters, the successional relation of horizontal foaming furnace preheating section (secondary high temperature section) temperature, foaming section (high temperature section) temperature, mesh belt transmission speed, the speed of drawing cooling roller and master slice, foam product abscess, apparent mass, product; Determine the foaming furnace parameters relationship of different multiplying, different master slice thickness, and foamed by the product of frothing test all size, determine the content of required whipping agent and frothing aid in products of different specifications formula.Preheating section temperature 140-190 DEG C, foaming section temperature 190-240 DEG C, guipure speed 2.0-3.5m/min.
The invention has the beneficial effects as follows:
1, the crosslinking agent B IPB by selecting decomposition temperature higher, makes not easily to decompose in its granulation, extrusion, ensures the homogeneity of product sulfuration; Not only improving the curability of material by adding EPDM, reducing content of crosslinking agent, also improving the toughness of material, be conducive to high temperature resistant XPE foam and do not break in hot-forming process, do not rupture.
2, major ingredient transfers the blended formula system of high density polyethylene(HDPE), linear low density polyethylene, Low Density Polyethylene to by traditional Low Density Polyethylene, improves the heat resistance of material, mechanical property, impact property, hardness.
3, by successively repeatedly processing blended method several times, the consistency of different kinds material is improved.
4, this type of material is in airduct moulding process, and shaping efficiency is high, and its hot plate welding tear force time length is longer, and practical life is high.
Accompanying drawing explanation
Fig. 1 is the production scheme of high temperature resistant XPE provided by the invention.
Embodiment
Below preferably embodiment of the present invention is described in further detail:
Embodiment 1
In the present embodiment, high temperature resistant XPE foam is by weight: the EPDM of 10%, the HDPE of 30%, 6% linking agent (BIPB), the whipping agent of 0.25% and the LLDPE of 10%, 43.75%LDPE, whipping agent adopts Cellmic C 121.
Preparation method is as follows:
Step 1: by HDPE, LLDPE, LDPE by twin screw granulation, prepare high temperature resistant master batch;
Step 2: high temperature resistant master batch and whipping agent are gone out foaming master batch by internally mix, Single screw extrusion preparation, BIPB and LDPE is gone out linking agent master batch by internally mix, Single screw extrusion preparation;
Step 3: stir by proportioning importing vertical screw stirrer according to described formula;
Step 4: the raw material stirred is poured in single screw extrusion machine and extrudes; Each district 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, flange, mould is divided into three heating zone, each district temperature is 125 ± 10 DEG C, and extruded velocity is 15 turns/min, extrusion neck ring mold 0.5mm.
Step 5: by extrusion sheet by three-roller calendaring, cooling forming, then rolling.
Step 6: the sheet material extruded is entered horizontal foaming furnace, foaming, cooling and shaping by the traction of die guipure, and high temperature resistant XPE foam coiled material is prepared in rolling.Preheating section temperature 140 DEG C, foaming section temperature 190 DEG C, guipure speed 2.0m/min.
Improve the heatproof of foam, weathering resistance, thus improve the dimensional stability of foam, according to ISTA testing standard (placing 22h under 120 DEG C of conditions), in specified maximum changing range, make test to its dimensional stability, data are as shown in table 1:
Table 1
Embodiment 2
High temperature resistant XPE foam is by weight: the EPDM of the 5% and HDPE of 20%, the linking agent (BIPB) of 9%, the whipping agent of 0.7%, the LLDPE of 20%, 45.3%LDPE, and whipping agent adopts Cellmic C 121.
Step 1: by HDPE, LLDPE, LDPE by twin screw granulation, prepare high temperature resistant master batch;
Step 2: high temperature resistant master batch and whipping agent are gone out foaming master batch by internally mix, Single screw extrusion preparation, BIPB and LDPE is gone out linking agent master batch by internally mix, Single screw extrusion preparation;
Step 3: stir by proportioning importing vertical screw stirrer according to described formula;
Step 4: the raw material stirred is poured in single screw extrusion machine and extrudes; Each district 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, flange, mould is divided into three heating zone, each district temperature is 125 ± 10 DEG C, and extruded velocity is 25 turns/min, extrusion neck ring mold 3.0mm.
Step 5: by extrusion sheet by three-roller calendaring, cooling forming, then rolling.
Step 6: the sheet material extruded is entered horizontal foaming furnace, foaming, cooling and shaping by the traction of die guipure, and high temperature resistant XPE foam coiled material is prepared in rolling, preheating section temperature 160 DEG C, foaming section temperature 200 DEG C, guipure speed 3m/min.
Improve the heatproof of foam, weathering resistance, thus improve the dimensional stability of foam, according to ISTA testing standard (placing 22h under 120 DEG C of conditions), in specified maximum changing range, make test to its dimensional stability, data are as shown in table 2:
Table 2
Embodiment 3
High temperature resistant XPE foam by weight, comprising: the EPDM of the 3% and HDPE of 30%, the linking agent (BIPB) of 0.5%, the whipping agent of 10%, the LLDPE of 15%, 41.5%LDPE, and whipping agent adopts Cellmic C 121.
Step 1: by HDPE, LLDPE, LDPE by twin screw granulation, prepare high temperature resistant master batch;
Step 2: high temperature resistant master batch and whipping agent are gone out foaming master batch by internally mix, Single screw extrusion preparation, BIPB and LDPE is gone out linking agent master batch by internally mix, Single screw extrusion preparation;
Step 3: stir by proportioning importing vertical screw stirrer according to described formula;
Step 4: the raw material stirred is poured in single screw extrusion machine and extrudes; Each district 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, flange, mould is divided into three heating zone, each district temperature is 125 ± 10 DEG C, and extruded velocity is 20 turns/min, extrusion neck ring mold 2mm.
Step 5: by extrusion sheet by three-roller calendaring, cooling forming, then rolling.
Step 6: the sheet material extruded is entered horizontal foaming furnace, foaming, cooling and shaping by the traction of die guipure, and high temperature resistant XPE foam is prepared in rolling, preheating section temperature 190 DEG C, foaming section temperature 240 DEG C, guipure speed 3.5m/min.
Improve the heatproof of foam, weathering resistance, thus improve the dimensional stability of foam, according to ISTA testing standard (placing 22h under 120 DEG C of conditions), in specified maximum changing range, make test to its dimensional stability, data are as shown in table 3:
Table 3
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a high temperature resistant XPE foam, is characterized in that, comprising: by weight percentage: HDPE, 5-20%LLDPE of 20-30%, the LDPE of BIPB, 26-67% of the EPDM of 3-10%, 0.25-0.7%, whipping agent 8-10%.
2. high temperature resistant XPE foam as claimed in claim 1, is characterized in that, described whipping agent adopts Cellmic C 121.
3. prepare a method for high temperature resistant XPE foam as claimed in claim 1, it is characterized in that, comprise following step:
Step 1: by HDPE, LLDPE, LDPE by twin screw granulation, prepare high temperature resistant master batch;
Step 2: high temperature resistant master batch and whipping agent are gone out foaming master batch by internally mix, Single screw extrusion preparation, BIPB and LDPE is gone out linking agent master batch by internally mix, Single screw extrusion preparation;
Step 3: stir by proportioning importing vertical screw stirrer according to described formula;
Step 4: the raw material stirred is poured in single screw extrusion machine and extrudes;
Step 5: by extrusion sheet by three-roller calendaring, cooling forming, then rolling;
Step 6: the sheet material extruded is entered horizontal foaming furnace, foaming, cooling and shaping by the traction of die guipure, and high temperature resistant XPE foam coiled material is prepared in rolling.
4. method as claimed in claim 3, is characterized in that, in described step 2, in single screw extrusion machine, extrude district and be provided with six heating zone, each district 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, flange, mould is divided into three heating zone, and each district temperature is 125 ± 10 DEG C.
5. method as claimed in claim 3, it is characterized in that, in described step 2, extruded velocity is that 15-25 turns/min, extrusion neck ring mold 0.5-3.0mm.
6. method as claimed in claim 3, is characterized in that, in the foam process of described step 6, and preheating section temperature 140-190 DEG C, foaming section temperature 190-240 DEG C, guipure speed 2.0-3.5m/min.
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| CN107379695A (en) * | 2017-06-05 | 2017-11-24 | 广东富利时实业有限公司 | A kind of closed cell foamed material and its manufacture formula and method |
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| CN112194834A (en) * | 2020-09-30 | 2021-01-08 | 广德祥源新材科技有限公司 | High-temperature-shrinkage-resistant polyethylene foamed sheet and preparation method thereof |
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| CN112706487A (en) * | 2020-12-23 | 2021-04-27 | 广德祥源新材科技有限公司 | One-step forming spraying-free wood grain foam and production process thereof |
| CN114874521A (en) * | 2021-02-05 | 2022-08-09 | 上海映甫新材料科技有限公司 | Chemical crosslinked polyethylene foam and preparation method thereof |
| CN113234269A (en) * | 2021-05-07 | 2021-08-10 | 湖北祥源新材科技股份有限公司 | Foam material applied to nose bridge patch of medical mask, preparation method and application |
| CN116589768A (en) * | 2022-04-25 | 2023-08-15 | 惠州市长园特发科技有限公司 | Ultrathin irradiation crosslinked polyethylene foam and preparation method thereof |
| CN116589768B (en) * | 2022-04-25 | 2023-12-26 | 惠州市长园特发科技有限公司 | Ultrathin irradiation crosslinked polyethylene foam and preparation method thereof |
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