CN106147171B - A kind of shape memory automobile baffle and preparation method thereof - Google Patents

A kind of shape memory automobile baffle and preparation method thereof Download PDF

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Publication number
CN106147171B
CN106147171B CN201610583579.8A CN201610583579A CN106147171B CN 106147171 B CN106147171 B CN 106147171B CN 201610583579 A CN201610583579 A CN 201610583579A CN 106147171 B CN106147171 B CN 106147171B
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parts
weight
automobile baffle
shape memory
calcium sulfate
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CN106147171A (en
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丁文
罗立立
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Ningbo Lianhua Automobile Part Co Ltd
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Ningbo Lianhua Automobile Part Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • 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
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7604—Temperature
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/004—Additives being defined by their length
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/12—Shape memory
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Biological Depolymerization Polymers (AREA)

Abstract

The present invention provides a kind of shape memory automobile baffle and preparation method thereof, is prepared by following component：Polyhydroxyalkanoate, calcium sulfate crystal whiskers, PLA, coupling agent, crosslinking agent, light stabilizer.Wherein, polyhydroxyalkanoate forms network structure with PLA by crosslinking agent, improves the mechanical property of automobile baffle.Polyhydroxyalkanoate interacts with PLA, form hard segment soft chain segment structure, in injection moulding process, cooled down first near the glass transition temperature of material, make material memory original-shape, when deforming upon, temperature at deformation is maintained under glass transition temperature, the automobile baffle of deformation will restore to the original state.Secondly, calcium sulfate crystal whiskers are orientated in injection moulding process along melt flows direction, and calcium sulfate crystal whiskers are parallel after shaping is distributed in inside automobile baffle, effectively raises the shock resistance and dimensional stability of automobile baffle.

Description

A kind of shape memory automobile baffle and preparation method thereof
Technical field
The present invention relates to a kind of automobile baffle, more particularly, to a kind of shape memory automobile baffle and preparation method thereof.
Background technology
Chinese automobile production and marketing in 2015 is respectively completed 2450.33 ten thousand and 2459.76 ten thousand, records high, continuous 7 years Continue to hold a post or title the first in the world.By high speed development for many years, the developing direction of automobile industry turn to high-grade, miniaturization, lighting and Diversification, also become very active to mould the researchs of Dai Gang in automotive vehicles applications.Auto parts and components have used a large amount of plastics zero Part, such as：Bumper, wheel cover, license plate, instrument board, baffle plate, knob, or even hood, gas handling system.Automobile baffle is Important composition in automobile component, for protecting auto parts and components without damage, strong with good stability of the dimension, mechanical property Feature, prepared at present using Ppo/pa Alloy or metal, but when Ppo/pa Alloy or metal are hit Shi Rongyi is deformed, it is difficult to is recovered, can only be caused very big waste by more bringing solution.
As environmental protection, low-carbon theory are gradually rooted in the hearts of the people, and the release of energy-saving and emission-reduction policy, use rich and influential family as plastics Automobile necessarily face impact.Growing trend is just being presented in the demand of automobile manufacture industry in biodegradable plastic, for example, Application using starch base, PLA, PCL and PBS as the product of main component is just progressively expanding.But biodegradable plastic Whether price or combination property aspect, have gap, the popularization to biodegradable plastic is brought with automobile using engineering plastics Hinder.
PHA full name polyhydroxyalkanoates, it is a kind of important biodegradable plastics, many Microbe synthesis can be used as Intracellular polyester, be a kind of natural polymeric biomaterial.It is that one kind can structure design because PHA monomeric species are more Biodegradable plastics, therefore people have carried out substantial amounts of research, are mainly used as medical material.Application No. 201210570631.8 Chinese patent literature discloses a kind of material based on poly-hydroxy fatty acid and preparation method thereof, uses The method of polyhydroxyalkanoate and polyurethane comixing is prepared for biomedical engineering, weaving, toy for children, articles for daily use Degradable shape-memory material, but do not suggest that the material can be used for this severe rugged environment of automobile engineering.Closed in addition with a large amount of In PHA research, such as PHA/PLA blending and modifyings, PHA/ Inorganic Fillers Filleds are modified, still, the mechanical property of these PHA materials Can be poor, dimensional stability deficiency, shape is difficult to recover, and cost is higher, so as to cause PHA material to be difficult to be used as automobile baffle.
The content of the invention
It is a primary object of the present invention to provide a kind of shape memory automobile baffle and preparation method thereof, the automobile gear of preparation Plate mechanical property is good, good dimension stability, can shape recovery.
To achieve the above objectives, the technical solution adopted by the present invention is：
The present invention provides a kind of shape memory automobile baffle, is prepared by following component：
Polyhydroxyalkanoate 55-70 parts by weight；
Calcium sulfate crystal whiskers 20-25 parts by weight；
PLA 9-18 parts by weight；
Coupling agent 0.5-1 parts by weight；
Crosslinking agent 0.2-0.5 parts by weight；
Light stabilizer 0.3-0.5 parts by weight.
Preferably, the structural formula of the polyhydroxyalkanoate is as shown in Equation 1：
[-O-CHR1-(CH2)x-CO-O-CHR2-(CH2)Y-COO-]n
Formula 1),
Wherein, R1For phenethyl, R2It is less than 6 alkyl, the ＜ Y ＜ 7 of X ＜ 5,4 for carbon atom number, number-average molecular weight is 40000-50000。
Preferably, a diameter of 2.5-3.5 microns of the calcium sulfate crystal whiskers, average aspect ratio 20-30.
Preferably, the number-average molecular weight of the PLA is 30000-40000.
Preferably, the crosslinking agent is dialkyl peroxide.
Accordingly, the present invention also provides a kind of preparation method of shape memory automobile baffle, comprises the following steps：By 55- 70 parts by weight polyhydroxyalkanoates and the mixing of 9-18 parts by weight PLA, obtain mixture A；To 20-25 parts sulfuric acid calcium 0.5-1 parts by weight coupling agents are added in whisker, stirring, obtain activating calcium sulfate crystal whiskers；By the mixture A, activation calcium sulfate Whisker, 0.2-0.5 parts by weight of crosslinking agent and 0.3-0.5 parts by weight light stabilizer are added in double screw extruder, extruding pelletization, are obtained To plastic grain, head temperature is 170-200 DEG C, screw speed 80-120r/min；The plastic grain is dried, is molded into Shape memory automobile baffle is obtained after type.
Preferably, in the step of obtaining activating calcium sulfate crystal whiskers, mixing time 5-10min, mixing speed 20-40 Turn/min.
Preferably, in the step of obtaining plastic grain, the prilling temperature of double screw extruder is 130-150 DEG C of an area, two 150-160 DEG C of area, three 160-170 DEG C of areas, four 170-180 DEG C of areas, five 180-190 DEG C of areas.
Preferably, in the step of obtaining shape memory automobile baffle, the drying temperature of plastic grain is 60-80 DEG C, is dried Time is 5-8 hours.
Preferably, injection molding is specially：Dried plastic grain is added in injection machine, injection machine temperature is an area 150-160 DEG C, two 160-180 DEG C of areas, three 180-200 DEG C of areas, 80-85 DEG C of insulation 5-7min is subsequently cooled to, is continued cool to 20-30 DEG C of insulation 5-8min.
The present invention provides a kind of shape memory automobile baffle and preparation method thereof, is prepared by following component：Poly- hydroxy aliphatic Acid esters 5-70 parts by weight；Calcium sulfate crystal whiskers 20-25 parts by weight；PLA 9-18 parts by weight；Coupling agent 0.5-1 parts by weight；Crosslinking Agent 0.2-0.5 parts by weight；Light stabilizer 0.3-0.5 parts by weight.Compared with prior art, polyhydroxyalkanoate leads to PLA Cross crosslinking agent and form network structure, improve the mechanical property of automobile baffle, reach automobile engineering requirement.Poly- hydroxy aliphatic Acid esters interacts with PLA, forms hard segment-soft chain segment structure, in injection moulding process, turns first in the vitrifying of material Temperature nearby cools down, and makes material memory original-shape, will be warm at deformation when occurring because of deformation caused by colliding, extruding Degree is maintained under glass transition temperature, and the automobile baffle of deformation will restore to the original state.Secondly, calcium sulfate crystal whiskers are in injection moulding process It is orientated along melt flows direction, calcium sulfate crystal whiskers are parallel after shaping is distributed in inside automobile baffle, effectively raises automobile The shock resistance and dimensional stability of baffle plate.Therefore, the mechanical property of automobile baffle prepared by the present invention is good, dimensional stability It is good, can shape recovery.
Embodiment
Describe to be used to disclose the present invention below so that those skilled in the art can realize the present invention.It is excellent in describing below Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
The present invention provides a kind of shape memory automobile baffle, is prepared by following component：
Polyhydroxyalkanoate 55-70 parts by weight；
Calcium sulfate crystal whiskers 20-25 parts by weight；
PLA 9-18 parts by weight；
Coupling agent 0.5-1 parts by weight；
Crosslinking agent 0.2-0.5 parts by weight；
Light stabilizer 0.3-0.5 parts by weight.
The structural formula of the polyhydroxyalkanoate is as shown in Equation 1：
[-O-CHR1-(CH2)X-CO-O-CHR2-(CH2)Y-COO-]n
Formula 1),
Wherein, R1For phenethyl, R2It is less than 6 alkyl, the ＜ Y ＜ 7 of X ＜ 5,4 for carbon atom number, number-average molecular weight is 40000-50000.In the network structure formed after carrying out cross-linking reaction, the phenethyl in polyhydroxyalkanoate contains firm Property group, with PLA collectively as hard segment, and other alkyl form hard chain as soft chain segment in polyhydroxyalkanoate Section-soft chain segment structure, makes automobile baffle have shape memory function.The polyhydroxyalkanoate is preferably 55-68 parts by weight, More preferably 61-65 parts by weight.
The calcium sulfate crystal whiskers are prepared using gypsum as raw material by manual control, with single crystal form growth, tool There are uniform cross section, complete profile, the threadiness of perfect internal structure, there is high intensity, high-modulus, high tenacity, height Insulating properties, abrasion performance, high temperature resistant, acid and alkali-resistance, anticorrosive, infrared reflectivity are good, are easy to surface treatment, are easily answered with polymer Many excellent physicochemical properties such as conjunction, nontoxic.The diameter for the calcium sulfate crystal whiskers that the present invention uses is preferably 2.5-3.5 microns, more Preferably 3 microns, average aspect ratio is preferably 20-30, and calcium sulphate content is more than 99%, primarily serves the chi for improving automobile baffle Very little stability and mechanical property, while reduce manufacturing cost.
The PLA is also known as polylactide, is a kind of degradable high polymer material from plant, has certain crisp Property, the number-average molecular weight of the PLA used in of the invention is preferably 30000-40000, and crosslinking is produced with polyhydroxyalkanoate Reaction, forming network structure can make automobile baffle have shape memory function.
The coupling agent that the present invention uses is preferably silane coupler, the calcium sulfate crystal whiskers handled using silane coupler and tree Aliphatic radical body has preferable caking property.The coupling agent that the present invention uses be more preferably KH-540, KH-550, KH-560, KH-570, One kind in KH-590, KH-592, A-151, A-171, A-172, Si-563, Si-602.
The crosslinking agent is preferably dialkyl peroxide, has half-life period small advantage during cross-linking reaction.This hair The crosslinking agent of bright use is more preferably di-tert-butyl peroxide, 2,5- dimethyl -2,5- bis- (t-butylperoxy) -3- second One kind in alkynes, 2,5- dimethyl -2,5- bis- (t-butylperoxy)-ethane, cumyl peroxide.
Light stabilizer is a kind of yellow powder, has the action of ultraviolet light in resistance sunshine, avoids the light of automobile baffle Aging.The light stabilizer that the present invention uses is preferably one kind in UV-123, UV-531 and UV-9.
Accordingly, the present invention also provides a kind of preparation method of shape memory automobile baffle, comprises the following steps：By 55- 70 parts by weight polyhydroxyalkanoates and the mixing of 9-18 parts by weight PLA, obtain mixture A；To 20-25 parts sulfuric acid calcium 0.5-1 parts by weight coupling agents are added in whisker, stirring, obtain activating calcium sulfate crystal whiskers；By the mixture A, activation calcium sulfate Whisker, 0.2-0.5 parts by weight of crosslinking agent and 0.3-0.5 parts by weight light stabilizer are added in double screw extruder, extruding pelletization, are obtained To plastic grain, head temperature is 170-200 DEG C, screw speed 80-120r/min；The plastic grain is dried, is molded into Shape memory automobile baffle is obtained after type.
In the step of obtaining activating calcium sulfate crystal whiskers, the present invention uses suitable mixing time and mixing speed, makes coupling Agent can be sufficiently mixed with calcium sulfate crystal whiskers, and as incorporation time, speed are not suitable for, calcium sulfate crystal whiskers surface coupling agent is uneven, Calcium sulfate is brilliant bad with resin matrix compatibility, causes automobile baffle mechanical properties decrease.Wherein, mixing time is preferably 5- 10min, more preferably 6-10min；Mixing speed is preferably that 20-40 turns/min, more preferably 25-35 turns/min.
In the step of obtaining plastic grain, the present invention carries out extruding pelletization using double screw extruder, by extruder Temperature is set, and crosslinking agent is fully reacted, noresidue.Heat can be caused in an extruder because biodegradation material stops for a long time Degraded, there is burnt material to produce, but screw speed is too fast, shearing force can cause macromolecular chain to be broken, therefore, present invention setting screw rod Rotating speed, each component is well mixed, and shortens material in the extruder residence time.Preferably, double screw extruder Prilling temperature is 130-150 DEG C of an area, two 150-160 DEG C of areas, three 160-170 DEG C of areas, four 170-180 DEG C of areas, five area 180-190 ℃。
Cross-linking reaction in the present invention is extrusion crosslinking, and the reaction time is short, therefore needs crosslinking agent to possess half-life period small spy Point, the present invention selected by crosslinking agent half-life period be less than 1min so that material had been carried out during extruding pelletization it is full cross-linked, There is no residual cross-linker, injection moulding process will not be had an impact.
In the step of obtaining shape memory automobile baffle, the plastic grain is dried, removes the moisture in plastic grain, Avoid forming defect in product surface.The drying temperature of plastic grain is preferably 60-80 DEG C, more preferably 7-80 DEG C；When drying Between be preferably 5-8 hours, more preferably 6-8 hours.
The injection molding is specially：Dried plastic grain is added in injection machine, injection machine temperature is an area 150-160 DEG C, two 160-180 DEG C of areas, three 180-200 DEG C of areas, 80-85 DEG C of insulation 5-7min is subsequently cooled to, is continued cool to 20-30 DEG C of insulation 5-8min.The present invention makes plastic grain fully plastify, forms certain mobility by setting injection temperature. The cooling procedure that the present invention uses is preferably divided into two stages, and the first stage is 80 DEG C -85 DEG C and is incubated 5-7min, makes automobile baffle Shape at such a temperature, second stage is that 20 DEG C of -30 DEG C of insulation 5-8min make automobile baffle cooling and demolding.Using first stage temperature After degree, time carry out cooling and shaping, automobile baffle can remember the original-shape, when deforming in use, will deform Place is heated to first stage temperature, will be restored to the original state at deformation, as cool time, temperature are not suitable for automobile baffle being caused to recover Less than original-shape.
From above scheme as can be seen that the present invention provides a kind of shape memory automobile baffle and preparation method thereof, preparation The mechanical property of automobile baffle is good, good dimension stability, can shape recovery.
For a further understanding of the present invention, technical scheme provided by the invention is carried out specifically with reference to embodiment Bright, protection scope of the present invention is not limited by the following examples.
Polyhydroxyalkanoate used in the following embodiments of the present invention is by Shenzhen Yi Keman bio tech ltd There is provided.
PLA used in the following embodiments of the present invention makes innovations Materials Co., Ltd from Nantong nine.
Calcium sulfate crystal whiskers used in the following embodiments of the present invention come from seapeak Zhu trade Co., Ltd.
Coupling agent used in the following embodiments of the present invention comes from union carbide corporation of the U.S..
Crosslinking agent used in the following embodiments of the present invention, from the gloomy Dihua work in Shanghai.
Light stabilizer used in the following embodiments of the present invention, from German BASF.
Embodiment 1
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 70；
The parts by weight of calcium sulfate crystal whiskers 20；
The parts by weight of PLA 9；
The parts by weight of coupling agent KH550 0.5；
The parts by weight of crosslinking agent cumyl peroxide 0.2；
The parts by weight of light stabilizer UV-123 0.3.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) coupling agent is added in calcium sulfate crystal whiskers, stirs 5-10min with mixer, 20 turns/min of mixing speed, obtain Treated calcium sulfate crystal whiskers.
3) mixture A is added into exhaust parallel double-screw extruder major ingredient storehouse, treated calcium sulfate crystal whiskers, crosslinking Agent, light stabilizer are separately added into corresponding side feeding machine, are granulated.Wherein twin-screw prilling temperature is 130 DEG C of an area, 2nd area 150 DEG C, three 160 DEG C of areas, four 170 DEG C of areas, five 180 DEG C of areas, 170 DEG C of head；Screw speed 80r/min.
4) 70 DEG C of the plastic grain drying 5 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 150 DEG C of an area, two 160 DEG C of areas, three 180 DEG C of areas, and cooling procedure is 80 DEG C of DEG C of 5min, 30 DEG C 5min, open mould and obtain automobile baffle.
Embodiment 2
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 55；
The parts by weight of calcium sulfate crystal whiskers 25；
The parts by weight of PLA 18；
The parts by weight of coupling agent KH550 1.0；
The parts by weight of crosslinking agent cumyl peroxide 0.5；
The parts by weight of light stabilizer UV-123 0.5.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) coupling agent is added in calcium sulfate crystal whiskers, stirs 10min with mixer, 40 turns/min of mixing speed, obtain everywhere The calcium sulfate crystal whiskers managed.
3) mixture A is added into exhaust parallel double-screw extruder major ingredient storehouse, treated calcium sulfate crystal whiskers, crosslinking Agent, light stabilizer are separately added into corresponding side feeding machine, are granulated.Wherein twin-screw prilling temperature is 150 DEG C of an area, 2nd area 160 DEG C, three 170 DEG C of areas, four 180 DEG C of areas, five 190 DEG C of areas, 200 DEG C of head；Screw speed 120r/min.
4) 70 DEG C of the plastic grain drying 8 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 160 DEG C of an area, two 180 DEG C of areas, three 200 DEG C of areas, and cooling procedure is 85 DEG C of 7min, 20 DEG C 8min, open mould and obtain automobile baffle.
Embodiment 3
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 60；
The parts by weight of calcium sulfate crystal whiskers 22；
The parts by weight of PLA 16.5；
The parts by weight of coupling agent KH550 0.8；
The parts by weight of crosslinking agent cumyl peroxide 0.3；
The parts by weight of light stabilizer UV531 0.4.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) coupling agent is added in calcium sulfate crystal whiskers, stirs 7min with mixer, 30 turns/min of mixing speed, handled The calcium sulfate crystal whiskers crossed.
3) mixture A is added into exhaust parallel double-screw extruder major ingredient storehouse, treated calcium sulfate crystal whiskers, crosslinking Agent, light stabilizer are separately added into corresponding side feeding machine, are granulated.Wherein twin-screw prilling temperature is 140 DEG C of an area, 2nd area 155 DEG C, three 165 DEG C of areas, four 175 DEG C of areas, five 185 DEG C of areas, 185 DEG C of head；Screw speed 100r/min.
4) 70 DEG C of the plastic grain drying 7 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 155 DEG C of an area, two 160 DEG C of areas, three 185 DEG C of areas, and cooling procedure is 82 DEG C of 6min, 25 DEG C 7min, open mould and obtain automobile baffle.
Comparative example 1
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 80；
The parts by weight of calcium sulfate crystal whiskers 0；
The parts by weight of PLA 19；
The parts by weight of coupling agent KH570 0；
The parts by weight of crosslinking agent 0.5；
The parts by weight of light stabilizer 0.5.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) mixture A is added into exhaust parallel double-screw extruder major ingredient storehouse, crosslinking agent, light stabilizer are separately added into pair The side feeding machine answered, is granulated.Wherein twin-screw prilling temperature is 135 DEG C of an area, two 150 DEG C of areas, three 160 DEG C of areas, 4th area 175 DEG C, five 180 DEG C of areas, 175 DEG C of head；Screw speed 80r/min.
3) 70 DEG C of the plastic grain drying 5 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 150 DEG C of an area, two 160 DEG C of areas, three 180 DEG C of areas, and cooling procedure is 80 DEG C of 7min, 30 DEG C 5min, open mould and obtain automobile baffle.
Comparative example 2
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 75；
The parts by weight of calcium sulfate crystal whiskers 23.5；
The parts by weight of PLA 0；
The parts by weight of coupling agent 1.0；
The parts by weight of crosslinking agent 0；
The parts by weight of light stabilizer 0.5.
A kind of described shape memory automobile baffle preparation method is as follows：
1) coupling agent is added in calcium sulfate crystal whiskers, stirs 10min with mixer, 40 turns/min of mixing speed, obtain everywhere The calcium sulfate crystal whiskers managed.
2) dried polyhydroxyalkanoate is added into exhaust parallel double-screw extruder major ingredient storehouse, treated sulphur Sour calcium pyroborate, light stabilizer are separately added into corresponding side feeding machine, are granulated.Wherein twin-screw prilling temperature is an area 150 DEG C, two 160 DEG C of areas, three 170 DEG C of areas, four 180 DEG C of areas, five 190 DEG C of areas, 180 DEG C of head；Screw speed 120r/min.
3) 70 DEG C of the plastic grain drying 6 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 160 DEG C of an area, two 180 DEG C of areas, three 200 DEG C of areas, and cooling procedure is 80 DEG C of 7min, 30 DEG C 5min, open mould and obtain automobile baffle.
Comparative example 3
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 61；
The parts by weight of calcium sulfate crystal whiskers 20；
The parts by weight of PLA 18；
The parts by weight of coupling agent 0；
The parts by weight of crosslinking agent 0.5；
The parts by weight of light stabilizer 0.5.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) mixture A is added into exhaust parallel double-screw major ingredient storehouse, calcium sulfate crystal whiskers, crosslinking agent, light stabilizer difference Side feeding machine corresponding to addition, is granulated.Wherein twin-screw prilling temperature is 150 DEG C of an area, two 160 DEG C of areas, three areas 165 DEG C, four 175 DEG C of areas, five 185 DEG C of areas, 180 DEG C of head；Screw speed 90r/min.
3) 70 DEG C of the plastic grain drying 8 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 160 DEG C of an area, two 175 DEG C of areas, three 190 DEG C of areas, and cooling procedure is 85 DEG C of 7min, 30 DEG C 5min, open mould and obtain automobile baffle.
Comparative example 4
Various raw materials are weighed according to quality parts ratio described below
The parts by weight of polyhydroxyalkanoate 60.5；
The parts by weight of calcium sulfate crystal whiskers 20；
The parts by weight of PLA 18；
The parts by weight of coupling agent 1.0；
The parts by weight of crosslinking agent 0；
The parts by weight of light stabilizer 0.5.
A kind of described shape memory automobile baffle preparation method is as follows：
1) polyhydroxyalkanoate and particles of polylactic acid are dried, and mixed in proportion, obtain mixture A.
2) coupling agent is added in calcium sulfate crystal whiskers, stirs 10min with mixer, 30 turns/min of mixing speed, obtain everywhere The calcium sulfate crystal whiskers managed.
3) mixture A is added into exhaust parallel double-screw major ingredient storehouse, treated calcium sulfate crystal whiskers, light stabilizer difference Side feeding machine corresponding to addition, is granulated.Wherein twin-screw prilling temperature is 145 DEG C of an area, two 160 DEG C of areas, three areas 165 DEG C, four 175 DEG C of areas, five 190 DEG C of areas, 190 DEG C of head；Screw speed 100r/min.
4) 70 DEG C of the plastic grain drying 8 hours that will be obtained, dried plastic grain is added in injection machine, noted Mould sample preparation.Wherein injection machine temperature is 160 DEG C of an area, two 180 DEG C of areas, three 200 DEG C of areas, and cooling procedure is 80 DEG C of 6min, 30 DEG C 8min, open mould and obtain automobile baffle.
1-3 of the embodiment of the present invention and comparative example the 1-4 automobile baffle prepared are detected respectively, and with polyphenylene oxide/poly- Acid amides alloy automobile baffle plate as a comparison case 5, is detected, as a result as shown in table 1 to it.
The material properties test result of automobile baffle prepared by the embodiment of the present invention of table 1
The material properties test result of automobile baffle prepared by the embodiment of the present invention of continued 1
Shape recovery rate η=(I1-I2)/(I1-I0) × 100%, wherein I0For original length, I1For length after deformation, I2 For length after reply.Shape recovery rate, recovery of shape time are used for weighing the shape-memory properties of automobile baffle, test in table 1 Temperature is 85 DEG C.Shrinkage factor is used for weighing automobile baffle dimensional stability quality.
The automobile baffle of the invention prepared, which is can be seen that, from test result corresponding to embodiment 1-3 has reached conventional stone The mechanical property of the automobile baffle of oil base plastic production, and there is preferable shape recovery rate and dimensional stability.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry For personnel it should be appreciated that the present invention is not limited to the above embodiments, that described in above-described embodiment and specification is the present invention Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its Equivalent defines.

Claims (10)

1. a kind of shape memory automobile baffle, it is characterised in that prepared by following component：
2. shape memory automobile baffle according to claim 1, it is characterised in that the structure of the polyhydroxyalkanoate Formula is as shown in Equation 1：
Wherein, R1For phenethyl, R2It is less than 6 alkyl, X ＜ 5,4 ＜ Y ＜ 7, number-average molecular weight 40000- for carbon atom number 50000。
3. shape memory automobile baffle according to claim 1, it is characterised in that the calcium sulfate crystal whiskers it is a diameter of 2.5-3.5 micron, average aspect ratio 20-30.
4. shape memory automobile baffle according to claim 1, it is characterised in that the number-average molecular weight of the PLA is 30000-40000。
5. shape memory automobile baffle according to claim 1, it is characterised in that the crosslinking agent is dialkyl group peroxidating Thing.
6. a kind of preparation method of shape memory automobile baffle, it is characterised in that comprise the following steps：
55-70 parts by weight polyhydroxyalkanoate and 9-18 parts by weight PLA are mixed, obtain mixture A；
0.5-1 parts by weight coupling agents are added into 20-25 parts sulfuric acid calcium pyroborates, stirring, obtain activating calcium sulfate crystal whiskers；
The mixture A, activation calcium sulfate crystal whiskers, 0.2-0.5 parts by weight of crosslinking agent and 0.3-0.5 parts by weight light stabilizers are added Enter in double screw extruder, extruding pelletization, obtain plastic grain, head temperature is 170-200 DEG C, screw speed 80-120r/ min；
The plastic grain is dried, shape memory automobile baffle is obtained after injection molding.
7. preparation method according to claim 6, it is characterised in that in the step of obtaining activating calcium sulfate crystal whiskers, stirring Time is 5-10min, and mixing speed is that 20-40 turns/min.
8. preparation method according to claim 6, it is characterised in that in the step of obtaining plastic grain, twin-screw extrusion The prilling temperature of machine is 130-150 DEG C of an area, two 150-160 DEG C of areas, three 160-170 DEG C of areas, four 170-180 DEG C of areas, 5th area 180-190℃。
9. preparation method according to claim 6, it is characterised in that in the step of obtaining shape memory automobile baffle, modeling The drying temperature for expecting particle is 60-80 DEG C, and drying time is 5-8 hours.
10. preparation method according to claim 6, it is characterised in that the injection molding is specially：
Dried plastic grain is added in injection machine, injection machine temperature is 150-160 DEG C of an area, two 160-180 DEG C of areas, three 180-200 DEG C of area, 80-85 DEG C of insulation 5-7min is subsequently cooled to, continues cool to 20-30 DEG C of insulation 5-8min.
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