CN103113653B - HDPE (high-density polyethylene)/LDPE (low-density polyethylene) blended foam material and preparation method thereof - Google Patents
HDPE (high-density polyethylene)/LDPE (low-density polyethylene) blended foam material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a foam material and a forming method thereof, and particularly relates to an HDPE (high-density polyethylene)/LDPE (low-density polyethylene) blended material and a foamed forming method thereof. The blended material comprises the following raw materials in parts by weight: 100 parts of HDPE and LDPE (the weight ratio of HDPE to LDPE is 10:90-90:10), 0.5 part of a crosslinking agent, 3-10 parts of an Ac foaming agent, 1-2 parts of zinc oxides, 0.5 part of a stearic acid, 0.1 part of an antioxidant, and 3-15 parts of an inorganic filler; and the forming method comprises the following main steps: firstly, carrying out blending, extruding pelletizing on HDPE and LDPE in proportion; drying the obtained object; carrying out plastification on the dried object in an open mill, and in the process of plastification, gradually adding other additives until a blending material is uniformly mixed; taking down a material sheet, carrying out hot-pressing on the material sheet, and carrying out pre-preforming operation on the material sheet; and finally, placing the material sheet in a die to carry out foamed forming.
Description
Technical field
The present invention relates to a kind of foam material and forming method thereof, particularly relate to a kind of high density polyethylene(HDPE) (HDPE)/Low Density Polyethylene (LDPE) intermingling material and foam forming method thereof.
Background technology
Polyethylene (Polyethylene, PE) be the polymkeric substance formed by vinyl polymerization, production development is existing about 60 years history so far, and current global polyethylene production occupies first of five large general resins, and polyethylene is also widely used at each industrial circle.
Polyethylene can be divided into high density polyethylene(HDPE) (HDPE) and Low Density Polyethylene (LDPE), in mechanical property, because on HDPE main chain, side chain is few and short, degree of crystallinity is high, therefore its tensile strength, hardness are all better than LDPE, and resistance to impact shock is lower than LDPE.LDPE resistance to low temperature is good.In chemical property, HDPE solvent resistant performance is better than LDPE.In permeability, HDPE ventilation property is only 1/5th of LDPE.The density of LDPE is low, and hardness is lower, and flexural strength is lower, but impact strength is high.HDPE due to melt strength lower, foam performance is not as good as LDPE.
Between HDPE and LDPE, consistency is good, there are some prior aries, both are carried out blended, the foam performance utilizing LDPE good improves the foam performance of HDPE, and in prior art, the roughly method of producing HDPE/LDPE blending foaming material is: first by auxiliary agent and HDPE, LDPE base-material mixing in mill, again by compound forcing machine, extrude particles, particles is injected mould cavity, crosslinked foaming.
But in the method, during due to mill mixing in early stage, melting temperature is lower, for 70-80 DEG C, after mixing, material can not melting, is still solid-state (particle or powdery), can conveniently adds forcing machine hopper like this, but, because temperature is low, be difficult to mix between several plastic material, cause the foaming material performance heterogeneity after extruding, especially in HDPE/LDPE(weight ratio)=about 50/50 time, be more difficult to mix by mill mixing; If when mill mixing in early stage, melting temperature is improved, easily causes material melts to stick together, no longer become solid-state (particle or powdery), be difficult to add forcing machine hopper, cannot foam shaping by extrusion be realized.Therefore, technology mode of the prior art, determining can only be mixing with low temperature regime.But it is not good that its shortcoming is mixed effect.
Summary of the invention
Technical problem to be solved by this invention is: in prior art, adopts first mill mixing, then the mode that forcing machine is extruded, and when producing HDPE/LDPE blending foaming material, mixing of materials is uneven, thus causes final foaming material performance heterogeneity,
For solving this technical problem, the technical solution used in the present invention is:
The invention provides a kind of HDPE/LDPE blending foaming material, its raw material forms, and counts by weight,
Total number of HDPE and LDPE 100 parts
Linking agent 0.5 part
Ac whipping agent 3-10 part
Zinc oxide 1-2 part
Stearic acid 0.5 part
Antioxidant 1010 0.1 part
Mineral filler 3-15 part,
Wherein, the weight ratio of HDPE and LDPE is 10:90-90:10,
Wherein, the melt flow rate (MFR) of selected HDPE is between 3-6g/10min, and the melt flow rate (MFR) of LDPE is between 2-3g/10min;
As preferably: linking agent is selected from dicumyl peroxide DCP or benzoyl peroxide BPO;
As preferably: mineral filler is selected from calcium carbonate or mica powder.
Present invention also offers a kind of preparation method of above-mentioned HDPE/LDPE blending foaming material, concrete operations are:
By the proportioning of each raw material,
(1) by the granulation of HDPE and LDPE blending extrusion, dry, obtain base-material,
As preferably: use twin screw extruder, carry out blended to HDPE and LDPE, good mixing effect, can extrude continuously, output is very large;
(2) base-material obtained in step (1) is plasticated in mill, plasticates in process, in base-material, add auxiliary agent, after auxiliary agent mixes with base-material, compound tablet is taken off, flattens while hot,
As preferably: plasticate in process, the roller temperature of two roller mill is set to 143-147 DEG C,
Because at this temperature, the blended material of HDPE/LDPE can melting, frothing aid can mix very well with material, form plastics/frothing aid mixture tablet, for next step sizing and foaming are got ready, lower than this temperature, HDPE/LDPE blend composition is difficult to melting, bad with the mixed effect of auxiliary agent; Temperature is higher than this temperature, and whipping agent decomposes in a large number, then follow-up foaming can failure, now, actual material temperature and roller temperature basically identical,
The auxiliary agent added in base-material, just refer to linking agent, zinc oxide, stearic acid, oxidation inhibitor, mineral filler and Ac whipping agent, wherein, whipping agent finally just adds, and in mixing process, plays triangle bag 5-7 time, until blend composition mixes,
Two roller mill is when mixing, and roll spacing is set to about 1mm, and during blanking, roll spacing tunes up to about 3mm;
(3) by after the compound tablet premolding in step (2), compound tablet is put in a mold, foaming process, after having foamed, after material cooling to be mixed, mold removal, obtains foam material,
As preferably: pre-forming operations is, compound tablet in 150 DEG C framed, premolding 10min under 5MPa pressure,
At this temperature, HDPE/LDPE blend composition can almost not foam again in melting,
As preferably: foaming is treated to, and compound tablet is in electric heating constant-temperature blowing drying box, and foam 5-10min at 170 ~ 180 DEG C of temperature,
As preferably: foaming is treated to, compound tablet in vulcanizing press, at temperature 170 ~ 180 DEG C and pressure 1 ~ 10MPa, foaming 5-10min,
When this temperature range can ensure that HDPE/LDPE blend composition foams, melt strength is better, and foaming process can mate with crosslink material process,
Pressure range and foamed time, within the scope of this, value is the most reasonable, and pressure improves again, little for foaming material performance impact, waste power; Time increases again, little for foaming material performance impact, and the time that increases reduces working efficiency, waste energy.
The invention has the beneficial effects as follows: the present invention, by blended for HDPE and LDPE post-foaming, improves the foam performance of HDPE material, and bi-material is good due to consistency, does not need compatilizer; Adopt preparation technology of the present invention, each raw material can be mixed, made blending foaming material uniform foam cell, material property is homogeneous, and density is low and adjustable, and mechanical property is adjustable.
Accompanying drawing explanation
Fig. 1 is frothing process flow diagram of the present invention.
Fig. 2 is in embodiment 1 to embodiment 5, blending foaming material, and foam density is with the variation diagram of HDPE:LDPE proportioning.
Fig. 3 is in embodiment 1 to embodiment 5, blending foaming material, and foam tear strength is with the variation diagram of HDPE:LDPE proportioning.
Fig. 4 is in embodiment 1 to embodiment 5, blending foaming material, the variation diagram of foam tensile intensity HDPE:LDPE proportioning.
Fig. 5 is in embodiment 1, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Fig. 6 is in embodiment 2, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Fig. 7 is in embodiment 3, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Fig. 8 is in embodiment 4, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Fig. 9 is in embodiment 5, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Figure 10 is in comparative example 1, with pure HDPE5306J for raw material, and the foam material of preparation, the electron-microscope scanning figure of foam after liquid nitrogen freezing brittle failure.
Figure 11 is in comparative example 3, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Figure 12 is in comparative example 4, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Figure 13 is in comparative example 5, the blending foaming material of preparation, the electron-microscope scanning figure (SEM) of foam after liquid nitrogen freezing brittle failure.
Embodiment
In following examples, the number related to is weight part.The raw material used and the particular case of equipment, as shown in table 1, table 2 and table 3:
Table 1 main raw material
| Raw material | Specification/model | Manufacturer |
| High density polyethylene(HDPE) (HDPE) | 5306J | Raise sub-petrochemical industry |
| Low Density Polyethylene (LDPE) | 2102TN26 | Qilu Petrochemical |
| AC whipping agent | Dn8 | Shanghai Wenhua chemical color company limited |
| Dicumyl peroxide (DCP) | Technical grade | Commercially available |
| Zinc oxide (ZnO) | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
| Antioxidant 1010 | Technical grade | Commercially available |
| Stearic acid | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
Table 2 major equipment
| Device name | Specifications and models | Manufacturer |
| Equidirectional parallel double-screw extruder | Model SHJ-35 | Guangzhou rubber and plastics machine factory |
| Two roller mill | SK-160B | Shanghai rubber machinery plant |
| Vulcanizing press | XLB-D350×350×2 | Changzhou first rubber equipment factory |
| Electric heating constant-temperature blowing drying box | DHG-9140A | Shanghai Hui Tai instrument manufacturing company limited |
| Scanning electronic microscope | JSM-6510 | NEC |
| Microcomputer controlled electronic universal testing machine | WDT-Series | Kai Qiangli test apparatus company limited of Shenzhen |
| Electronic balance (Max:500g) | TP-213 type | Beijing Sai Duolisi instrument system company limited |
Table 3 twin screw extruder each district temperature
| One district | 2nd district | 3rd district | 4th district | 5th district |
| 150℃ | 155℃ | 170℃ | 180℃ | 180℃ |
| 6th district | 7th district | 8th district | 9th district | Head |
| 180℃ | 180℃ | 180℃ | 190℃ | 185℃ |
Embodiment 1:
Foaming formulation is: HDPE is 10 parts, LDPE90 part, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 3 parts, 1.3 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 3 parts, mineral filler calcium carbonate.
Operation:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 143 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 5 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 180 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
After testing: blending foaming material apparent density is 0.16g.cm
-3, tear strength is 7.9N/mm, and tensile strength is 1.1MPa.
Density presses GB/T6342) 1995 tests; Tear strength presses GB/T529) in 1999, without scarfing angle tear strength standard, test; Tensile strength presses GB/T528) 1998 tests.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 5.As can be seen from this scintigram, foam material uniform foam cell prepared by the present invention, foam material mostly is closed pore; Direct ruler measures multiple cell diameter on the SEM figure amplified, and calculate the mean value of cell diameter according to scale, abscess mean diameter is 300 microns.
Embodiment 2:
Foaming formulation is: HDPE is 25 parts, and LDPE is 75 parts, benzoyl peroxide (BPO) 0.5 part, Ac whipping agent 5 parts, 1.5 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, mineral filler mica powder 6 parts.
Technique:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 144 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 6 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 180 DEG C, 10MPa foam 5min, and after material to be mixed cools, mold removal, obtains foam material.
After testing: blending foaming material apparent density is 0.29g.cm
-3, tear strength is 12.3N/mm, and tensile strength is 1.5MPa.
Density presses GB/T6342) 1995 tests; Tear strength presses GB/T529) in 1999, without scarfing angle tear strength standard, test; Tensile strength presses GB/T528) 1998 tests.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 6.
Embodiment 3:
Foaming formulation is: HDPE is 50 parts, and LDPE is 50 parts, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 7 parts, 1.7 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 9 parts, mineral filler calcium carbonate.
Technique:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 145 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 7 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, be placed in electric heating constant-temperature blowing drying box by obtained sample strip, in 175 DEG C, foaming 10min, after material cooling to be mixed, mold removal, obtains foam material.
After testing: blending foaming material apparent density is 0.43g.cm
-3, tear strength is 21N/mm, and tensile strength is 3.2MPa.
Density presses GB/T6342) 1995 tests; Tear strength presses GB/T529) in 1999, without scarfing angle tear strength standard, test; Tensile strength presses GB/T528) 1998 tests.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 7.
Embodiment 4:
Foaming formulation is: HDPE is 75 parts, and LDPE is 25 parts, benzoyl peroxide (BPO) 0.5 part, Ac whipping agent 9 parts, 1.9 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, mineral filler mica powder 12 parts.
Technique:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 146 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 6 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 170 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
After testing: blending foaming material apparent density is 0.48g.cm
-3, tear strength is 37.5N/mm, and tensile strength is 4.6MPa.
Density presses GB/T6342) 1995 tests; Tear strength presses GB/T529) in 1999, without scarfing angle tear strength standard, test; Tensile strength presses GB/T528) 1998 tests.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 8.
Embodiment 5:
Foaming formulation is: HDPE is 90 parts, and LDPE is 10 parts, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 10 parts, 2 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 15 parts, mineral filler calcium carbonate.
Technique:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 147 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 7 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 180 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
After testing: blending foaming material apparent density is 0.49g.cm
-3, tear strength is 41N/mm, and tensile strength is 5.4MPa.
Density presses GB/T6342) 1995 tests; Tear strength presses GB/T529) in 1999, without scarfing angle tear strength standard, test; Tensile strength presses GB/T528) 1998 tests.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 9.
Comparative example 1:
Foaming formulation is: HDPE100 part, benzoyl peroxide (BPO) 0.5 part, Ac whipping agent 5 parts, 1.5 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, mineral filler mica powder 6 parts.
Technique:
(1) by the HDPE pellet of drying, be plasticate in the mill of 144 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 7 times, until blend composition mixes, tablet is taken off and flattens while hot;
(2) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 180 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in that shown in accompanying drawing 10, abscess is uneven, subsides and to merge phenomenon serious.Accompanying drawing 10 and accompanying drawing 5-9 are contrasted, find that HDPE/LDPE foam material abscess is more even than HDPE foam material, namely LDPE improves the foam performance of HDPE.
Comparative example 2:
This comparative example formula, operation and embodiment 1 are basically identical, and when just will plasticate, the roller temperature drop of mill is 135 DEG C:
Foaming formulation is: HDPE is 10 parts, LDPE90 part, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 3 parts, 1.3 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 3 parts, mineral filler calcium carbonate.
Operation:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 135 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 7 times, tablet is taken off and flattens while hot,
When experiment proceeds to this step, find that HDPE/LDPE blend still exists partial particulate shape, there is no melting, auxiliary agent is not distributed in plastics materials completely yet, cannot carry out next step experimental implementation, therefore the failure of an experiment, so when plasticating, roller temperature is too low, can affect experimental result.
Comparative example 3:
This comparative example formula, operation and embodiment 1 are basically identical, when just will plasticate, the roller temperature rise of mill is 160 DEG C: foaming formulation is: HDPE is 10 parts, LDPE90 part, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 3 parts, 1.3 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 3 parts, mineral filler calcium carbonate.
Operation:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 160 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 5 times, until blend composition mixes, tablet is taken off and flattens while hot.
After experiment proceeds to this step, by intermingling material after liquid nitrogen freezing brittle failure, detected by electron-microscope scanning figure, electron-microscope scanning figure (SEM), see shown in accompanying drawing 11, find HDPE/LDPE blend partial foaming, and abscess is uneven, so when plasticating, roller temperature is too high, can affect experimental result, in the present invention, when mill roller temperature is set to 143-147 DEG C, the most rationally.
Comparative example 4:
This comparative example formula, operation and embodiment 1 are basically identical, just blowing temperature are reduced to 155 DEG C:
Foaming formulation is: HDPE is 10 parts, LDPE90 part, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 3 parts, 1.3 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 3 parts, mineral filler calcium carbonate.
Operation:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 145 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 5 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 155 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
Foam material is after liquid nitrogen freezing brittle failure, and the electron-microscope scanning figure of foam is shown in that shown in accompanying drawing 12, in tablet, abscess is uneven.
Comparative example 5:
This comparative example formula, operation and embodiment 1 are basically identical, and just being raised by blowing temperature is 190 DEG C:
Foaming formulation is: HDPE is 10 parts, LDPE90 part, dicumyl peroxide (DCP) 0.5 part, Ac whipping agent 3 parts, 1.3 parts, zinc oxide, stearic acid 0.5 part, antioxidant 1010 with 0.1 part, 3 parts, mineral filler calcium carbonate.
Operation:
(1) HDPE, LDPE are mixed on high-speed mixer according to proportioning, then compound is passed through twin screw extruder extruding pelletization, twin screw extruder each district temperature arranges in table 3,80 DEG C of dry 8h in air dry oven, obtains dry base-material;
(2) by dried blend composition, be plasticate in the mill of 145 DEG C in roller temperature, add other auxiliary agent gradually, finally add whipping agent, play triangle bag 5 times, until blend composition mixes, tablet is taken off and flattens while hot;
(3) tablet is carried out premolding 10min with 5MPa pressure in 150 DEG C framed, by obtained sample strip on vulcanizing press in 190 DEG C, 10MPa foam 10min, and after material to be mixed cools, mold removal, obtains foam material.
Foam material is after liquid nitrogen freezing brittle failure, the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 13, is found out, show several abscess large especially in figure by electron-microscope scanning figure (SEM), cause because abscess merges, visible, foam at such a temperature, abscess subsides and merges more, because temperature is higher, HDPE/LDPE material melt strength is lower, and bubble breaks through bubble wall, subsides and merges phenomenon.In the present invention, blowing temperature is set to 170 ~ 180 DEG C, the most suitable.
Claims (5)
1. a preparation method for HDPE/LDPE blending foaming material, is characterized in that:
Described HDPE/LDPE blending foaming material, its raw material forms, and counts by weight,
Wherein, the weight ratio of HDPE and LDPE is 10:90-90:10;
Described preparation method is,
By each raw material weight number
(1) by the granulation of HDPE and LDPE blending extrusion, dry, obtain base-material,
Wherein, by twin screw extruder extruding pelletization, twin screw extruder each district temperature is set to, 150 DEG C, a district, 155 DEG C, 2nd district, 170 DEG C, 3rd district, 180 DEG C, 4th district, 180 DEG C, 5th district, 180 DEG C, 6th district, 180 DEG C, 7th district, 180 DEG C, 8th district, 190 DEG C, 9th district, head 185 DEG C;
(2) base-material obtained in step (1) is plasticated in mill, plasticates in process, in base-material, add auxiliary agent, after auxiliary agent mixes with base-material, compound tablet is taken off, flattens while hot,
Wherein, described plasticates in process, and the roller temperature of mill is 143-147 DEG C;
(3) by after the compound tablet premolding in step (2), compound tablet is put in a mold, foaming process, after having foamed, after material cooling to be mixed, mold removal, obtains foam material.
2. the preparation method of HDPE/LDPE blending foaming material as claimed in claim 1, it is characterized in that: the auxiliary agent added in base-material described in step (2) is, linking agent, zinc oxide, stearic acid, oxidation inhibitor, mineral filler and Ac whipping agent, wherein, whipping agent finally just adds.
3. the preparation method of HDPE/LDPE blending foaming material as claimed in claim 1, is characterized in that: the pre-forming operations described in step (3) is, compound tablet in 150 DEG C framed, premolding 10min under 5MPa pressure.
4. the preparation method of HDPE/LDPE blending foaming material as claimed in claim 1, it is characterized in that: the foaming described in step (3) is treated to, compound tablet is in electric heating constant-temperature blowing drying box, and foam 5-10min at 170 ~ 180 DEG C of temperature.
5. the preparation method of HDPE/LDPE blending foaming material as claimed in claim 1, it is characterized in that: the foaming described in step (3) is treated to, compound tablet is in vulcanizing press, and at temperature 170 ~ 180 DEG C and pressure 1 ~ 10MPa, foam 5-10min.
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| CN104177689A (en) * | 2014-08-25 | 2014-12-03 | 丹阳市恒大塑业有限公司 | Foamed HDPE plastic sheet |
| CN105175647A (en) * | 2015-08-03 | 2015-12-23 | 苏州云舒新材料科技有限公司 | Polyethylene foam material and preparation method therefor |
| CN106632863A (en) * | 2015-10-30 | 2017-05-10 | 惠州市环美盛新材料有限公司 | Non-chemically-crosslinked polyethylene foamed sheet and preparation method thereof |
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Effective date of registration: 20201112 Address after: Fengli town Xinjian West Road, Rudong County, Nantong City, Jiangsu Province 226400 Patentee after: Rudong Wenyuan investment and Development Co., Ltd Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |