CN109825065A - A kind of preparation process of sensor outer housing - Google Patents
A kind of preparation process of sensor outer housing Download PDFInfo
- Publication number
- CN109825065A CN109825065A CN201910065403.7A CN201910065403A CN109825065A CN 109825065 A CN109825065 A CN 109825065A CN 201910065403 A CN201910065403 A CN 201910065403A CN 109825065 A CN109825065 A CN 109825065A
- Authority
- CN
- China
- Prior art keywords
- parts
- outer housing
- sensor outer
- preparation process
- nucleating agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 65
- -1 polybutylene terephthalate Polymers 0.000 claims abstract description 42
- 239000013078 crystal Substances 0.000 claims abstract description 41
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 37
- 239000002667 nucleating agent Substances 0.000 claims abstract description 36
- 229920001707 polybutylene terephthalate Polymers 0.000 claims abstract description 31
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 31
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 30
- 239000004743 Polypropylene Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 229920000426 Microplastic Polymers 0.000 claims abstract description 23
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 21
- 229920001155 polypropylene Polymers 0.000 claims abstract description 21
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 16
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004952 Polyamide Substances 0.000 claims abstract description 11
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- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims abstract description 8
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims abstract description 8
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- 239000000203 mixture Substances 0.000 claims description 14
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- 235000010234 sodium benzoate Nutrition 0.000 claims description 7
- 239000004299 sodium benzoate Substances 0.000 claims description 6
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims description 5
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 description 2
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- LNKJESSHRFPVPE-UHFFFAOYSA-N 5-(diethylamino)pentyl 3,4,5-trimethoxybenzoate;hydrochloride Chemical compound Cl.CCN(CC)CCCCCOC(=O)C1=CC(OC)=C(OC)C(OC)=C1 LNKJESSHRFPVPE-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to a kind of preparation processes of sensor outer housing, it is related to brake system of car technical field, it is comprised the following steps that: S1: preparing plastic pellet, the plastic pellet includes the raw material of following components by weight percent: 30-50 parts of polybutylene terephthalate (PBT), 25-45 parts of polyethylene terephthalate, 40-60 parts of polyamide, 15-25 parts of glass fibre, 5-10 parts of calcium carbonate crystal whisker, 5-10 parts of nucleating agent, 0.1-0.5 parts of odium stearate, 0.1-0.5 parts of phosphite ester, 0.1-0.2 parts of dilauryl thiodipropionate;S2: the first auxiliary agent of preparation；S3: the first auxiliary agent obtained in S2 is sprayed on mold；S4: plastic pellet obtained in S1 is melted, and is pressed and molded by the mold in S3 to get sensor outer housing.Through polyethylene terephthalate and PA polybutyleneterephthalate under the action of maleic anhydride modified polypropylene and nucleating agent, accelerate crystalline rate, increase crystal density, improves stability when molding, improve the rigidity and wearability of product.
Description
Technical field
The present invention relates to brake system of car technical field, in particular to a kind of preparation process of sensor outer housing.
Background technique
Traditional hydraulic braking system for automobile is mainly by brake pedal, vacuum booster, master cylinder, wheel cylinder, brake drum and pipe
Road etc. is constituted, and electronic hydraulic brake system (EHB) is developed on the basis of traditional liquid braking device.Operating mechanism
With an electronic type brake pedal instead of traditional hydraulic braking pedal, bulky vacuum booster is eliminated.
Authorization Notice No. is the Chinese utility model patent of CN207089289U, discloses a kind of hydraulic system of integrated type electrical
Dynamic system, including shell；Master cylinder, master cylinder are connect with shell；Motor, the output end of motor pass through the piston of master cylinder connector and master cylinder
Connection；Pedal push rod is connect with brake pedal；Master cylinder push rod, one end connect with pedal push rod, are axial along shell with pedal push rod
Sliding, the other end and master cylinder connector are oppositely arranged and preset clearance, forms decoupling-structure；Pedal sense simulator, setting exist
Hull outside is connect with pedal push rod；Displacement sensor is arranged in shell.
A kind of displacement sensor is disclosed in above-mentioned integrated type electrical brake fluid system, and biography is provided with outside displacement sensor
Sensor shell, including hollow outer housing, shell two sides are recessed limiting slot, and one end of outer housing offers perforation, shell
Body is provided with erecting bed far from one end of perforation, and erecting bed is provided with more root cutting feet far from the side of outer housing.
It is tired to generally use higher creep resistance, resistance cheap and have in production for existing sensor outer housing
The polyethylene terephthalate of Lao Xing, abrasion-resistant and toughness are raw material.But polyethylene terephthalate there are
Glass transition temperature is high, and crystallization rate is slow, and moulding cyclc is long, and molding cycle is long, and molding shrinkage is big, and poor dimensional stability etc. is asked
Topic.It causes when making sensor outer housing, since the sensor outer housing of rigid compression moulding is provided with through-hole due to centre, and passes
The temperature of sensor shell can not rapid crystallization it is cooling, cause sensor outer housing also in certain molten condition, and exist inside
The case where collapsing influences the product qualification rate of sensor outer housing.
Summary of the invention
The object of the present invention is to provide a kind of preparation process of sensor outer housing, by polyethylene terephthalate and
PA polybutyleneterephthalate accelerates crystalline rate under the action of maleic anhydride modified polypropylene and nucleating agent, increases crystallization
Density improves stability when molding, improves the rigidity and wearability of product.
Foregoing invention purpose of the invention has the technical scheme that
A kind of preparation process of sensor outer housing, comprises the following steps that:
S1: preparing plastic pellet, and the plastic pellet includes the raw material of following components by weight percent: polybutylene terephthalate
30-50 parts of ester, 25-45 parts of polyethylene terephthalate, 40-60 parts of polyamide, 15-25 parts of glass fibre, calcium carbonate are brilliant
It must 5-10 parts, 5-10 parts of nucleating agent, 0.1-0.5 parts of odium stearate, 0.1-0.5 parts of phosphite ester, dilauryl thiodipropionate
0.1-0.2 parts；
S2: the first auxiliary agent of preparation；
S3: the first auxiliary agent obtained in S2 is sprayed on mold；
S4: plastic pellet obtained in S1 is melted, and is pressed and molded by the mold in S3 to get sensor outer housing.
By using above-mentioned technical proposal, polyethylene terephthalate (PET) is milky or light yellow height knot
The polymer of crystalline substance, smooth surface and it is glossy.Creep resistance, resistance to fatigue resistance, abrasion-resistant and good stability of the dimension, wear away it is small and
Hardness is high, and have maximum toughness in thermoplastic: electrical insulation capability is good, be affected by temperature it is small, it is nontoxic, against weather, anti-
Chemicals stability is good, and water absorption rate is low, weak acid resistant and organic solvent.
But the glass transition temperature of PET resin is higher, and crystallization rate is slow, and moulding cyclc is long, and molding cycle is long, molding shrinkage
Greatly, poor dimensional stability, the molding of crystallization are in brittleness, and heat resistance is low etc..
PA polybutyleneterephthalate (PBT) main chain has been connected for rigid phenyl ring with flexible fatty alcohol by each repetitive unit
The saturated linear molecular composition come, the height geometrical regularity and rigid element of molecule make polymer have high mechanical strength,
Chemical reagent resistance outstanding, heat resistance and excellent electrical property；There is no side chain, symmetrical configuration in molecule, satisfaction is closely piled up
Requirement, so that this polymer be made to have the crystalline and high-melting-point of height, it is good comprehensive that the structure of molecule determines that PBT has
Close performance.
But the crystallization rate of PBT resin is fast, is easy in forming process due to uneven in temperature, and causes to deform.
Alloy made from PBT and PET blending and modifying can be learnt from other's strong points to offset one's weaknesses, comprehensive performance is preferable, simultaneously because PET is more
Cheaply, additionally it is possible to save cost.
Polyamide have good comprehensive performance, including mechanical property, heat resistance, wear resistance, chemical resistance and
Self-lubrication, and coefficient of friction is low, there is certain anti-flammability, it is easy to process, it is suitable for being increased with glass fibre and the filling of other fillers
It is strong modified, it improves performance and expands application range.By the way that the raising air-tightness and coloring that have polyamide that product can be improved is added
Property.
Glass fibre is a kind of inorganic non-metallic material haveing excellent performance, many kinds of, good insulating, heat resistance be strong,
Corrosion resistance is good, high mechanical strength, but the disadvantage is that property is crisp, wearability is poor, the reinforcing material being typically used as in composite material, electricity
Insulating materials and heat-insulating material.In PET and PBT Blending Processes, the addition of glass fibre can play the role of enhancing,
Enhanced alloy heat resistance and electrical insulating property are more excellent, and mechanical strength and rigidity are much higher than other reinforcing materials, bullet
Property modulus it is high, croop property excellent impact resistance fatigue durability rub resistance is good.
Calcium carbonate crystal whisker is another novel inorganic filling after nanometer calcium carbonate, nontoxic, odorlessness, white paulin
Loose shape solid (being whiskers body under microscope).Its with higher mechanical strength, and in use can vibration damping, it is anti-skidding,
Noise reduction inhales wave；Coefficient of friction is high, and wear-resisting property and heat resistance are high；Stable friction performance, heat fading and hot restorability compared with
Good, high temperature friction and wear behavior is superior；Improve life of product；Raw material sources are abundant, and price is low, will not be right because of raw material problem
Production has an impact；The powder generated after product friction is nontoxic, pollutes small.
When dry due to CaCO3 particle, surface hydroxyl interacts to form hydrogen bond, mutual by hydrogen bond action between particle
Aggregation, to form hard aggregation, influences calcium carbonate crystal whisker to the toughening effect of composite material.
After calcium carbonate crystal whisker surface passes through odium stearate activation modification, it can be improved between calcium carbonate crystal whisker and PET/PBT
Boundary strength；Calcium carbonate crystal whisker is set to be dispersed in system.
Meanwhile odium stearate can be used as interior adding type release agent, improve the stripping result of product.
The addition of nucleating agent can accelerate crystalline rate, increase crystal density, and further improvement PET crystallization rate is slow lacks
Point, while avoiding in PBT crystallization process that deformation occurs, the rigidity and wearability of product are improved, avoids that warpage occurs.
Phosphite ester can eliminate peroxy radical and alkoxy free group, and can inhibit light degradation, product can be prevented due to light
According to and aging, improve product service life.Phosphite ester is in addition to as important antioxidant and performance is outstanding wear-resistant
Agent improves the wearability of product.
Phosphite ester can make intermolecular generation chain extending reaction, while inhibiting transesterification so as to improve the drawing of system
Performance is stretched, unnotched impact strength is made to be greatly enhanced, and can make the viscosity of alloy that pseudoplastic fluid be presented and cut
The dilute feature of shear improves processing performance；Cooperate with nucleating agent, can further improve crystallizing power.
Dilauryl thiodipropionate abbreviation DLTP.White powder or flakey object.Has the function of peroxynitrite decomposition compound.
It can be used as the auxiliary antioxidant of polyethylene, polypropylene, ABS resin, polyvinyl chloride etc..Have do not pollute, be not colored, high temperature process when
Undec feature.
The present invention is further arranged to: 20-30 parts of atactic copolymerized polypropene, 6-10 parts of nano-calcium carbonate calcium powder, citrate
1-5 parts, 1-5 parts of benzophenone.
The present invention is further arranged to: also including following raw material: atactic copolymerized polypropene in the plastic pellet
20-30 parts, 6-10 parts of nano-calcium carbonate calcium powder, 1-5 parts of citrate, 1-5 parts of benzophenone.
By using above-mentioned technical proposal, atactic copolymerized polypropene is also polyacrylic one kind, the base of its macromolecular chain
This structure is modified with different types of monomer molecule is added.Ethylene is most common monomer, it causes polypropylene physical
The change of matter.Compared with PP homopolymer, random copolymer improves optical property, that is, increases transparency and reduce preformed casse,
Improve shock resistance, increase flexibility, reduce fusion temperature, thus also reduce hot melt jointing temp, chemical stability,
It is essentially identical with homopolymer in terms of water vapour isolation performance and organ sensation performance.
Nanometer calcium carbonate is also known as super fine calcium carbonate, title, that is, calcium carbonate superfine powder of standard.Nanometer calcium carbonate application most at
Ripe industry is that plastics industry is mainly used in high-grade plastic products.The rheological characteristic that plastic matrix can be improved improves its mouldability.
Have the function of as plastic filler toughened and reinforced, improve the bending strength and bending elastic modulus of plastics, heat distortion temperature and
Dimensional stability, while it is stagnant hot also to assign plastics.The calcium carbonate crystal whisker usage amount that nano-calcium carbonate calcium powder can reduce is added, drop
Low enterprise's production cost.
Citrate is often referred to tri-n-butyl citrate, and chemical name 3- hydroxyl -3- carboxyl glutaric acid tributyl, is a kind of ester
Class compound, colorless and transparent high boiling liquid, is slightly soluble in water, dissolves each other with most organic solvents.Industrially by citric acid and positive fourth
Alcohol reacts, and can be directly used for plasticizer, can also be further processed into the plasticizer tributyl 2-acetylcitrate of function admirable.
This product low toxicity, can be considered nontoxic plasticizer, is commonly called as environment-friendlyplasticizer plasticizer, the O-phthalic that can be restricted with alternate application range
Acid ester type plasticizer.
Benzophenone is a kind of photoinitiator, and ultraviolet light can be absorbed, and prevents product due to by direct sunlight, and aging
It decomposes, improves the service life and intensity of product.Meanwhile can be used as solvent, it merges raw material adequately, improves each original
The dispersibility of material forms the liquid of stable uniform.
The present invention is further arranged to: the nucleating agent includes the raw material of following weight percent meter: alpha-crystal form nucleating agent
30-50%, beta crystal-type nucleater 50-70%.
By using above-mentioned technical proposal, compared with traditional alpha-crystal form isotactic polypropylene, beta crystal isotactic polypropylene room temperature
Preferable with low temperature impact strength, heat distortion temperature is high, and higher toughness and ductility are shown under high-speed stretch, not easy to brittle
It splits, has beta crystal-type nucleater by being added, the generation of beta crystal isotactic polypropylene can be improved, to improve the impact strength of product
And ductility.
Beta crystal-type nucleater can be with CaCO simultaneously3It acts synergistically with calcium carbonate crystal whisker, the tough of product can be improved
Property.
The addition of alpha-crystal form nucleating agent can refine crystalline form size, increase knot performance number, improves the transparency and shorten molding cycle,
Such as enhance the draftability and rigidity of PP；Knot product kenel can enhance the notch impact strength and heat distortion temperature of PP.Nucleating agent adds
Enter the toughness that can significantly improve material.Crystal form modification agent is added to the knot moral character polymer such as PP, PE, polyamide, polyester, polyethers
In, thus it is possible to vary the crystallization behavior of resin accelerates crystallization rate, increases knot product density and promotes fine grain size, shortens
Molding cycle, comprehensively or the physical mechanicals such as the product transparency, lustrous surface, tensile strength, rigidity, heat distortion temperature are improved in part
Performance.
Alpha-crystal form nucleating agent and beta crystal-type nucleater are added in PP, crystallization can be made to elevated temperature excursions, and crystallization rate compared with
Blank increases.
The present invention is further arranged to: the alpha-crystal form nucleating agent includes the raw material of following weight percent meter: sodium benzoate
30-40%, maleic anhydride 30-50%, hydrotalcite 20-30%.
By using above-mentioned technical proposal, sodium benzoate is a kind of organic nucleating agent, and it is molten to be dissolved in PET for it at high temperature
Body can chemically react when PET is squeezed out at high temperature with sodium benzoate, generate PET-COONa substance, have ionic end groups
PET melt between will form ion cluster, ion cluster will become nucleating agent and play nucleation, strand rule in the melt
Entire row column rapid crystallization；On the other hand, due to molecular chain rupture in reaction process, local relative molecular mass is caused to reduce, from
And promoting the crystallization of whole system because of local-crystalized accelerate, crystalline rate is greatly improved in these two aspects collective effect.But benzene
The nucleophilic substitution of sodium formate and PET will cause the degradation of resin.
There is maleic anhydride by being added, makees chain extender to fill to supplement the molecular weight of PET, prevent the degradation of resin.
With atactic copolymerized polypropene graft copolymerization can occur for maleic anhydride simultaneously, generate maleic anhydride modified polypropylene, horse
Come anhydride-modified polypropylene can be used as plasticizer and its epoxy-functional can occur with the carboxyl end group of PBT and PET, hydroxyl it is anti-
It answers, generates more block copolymers, improve the impact strength of alloy.
Hydrotalcite is a kind of clay class nucleating agent, thus it is possible to vary the crystallization behavior of resin accelerates crystallization rate, increases knot product
Density and promote fine grain size, shortens molding cycle, comprehensively or the product transparency, lustrous surface, stretching are improved in part
The physical mechanical properties such as intensity, rigidity, heat distortion temperature.
The present invention is further arranged to: the beta crystal-type nucleater includes the one of substituted aromatic amide class or substitution benzamides
Kind is a variety of.
By using above-mentioned technical proposal, substituted aromatic amide class uses the TMB-4 of Shanxi chemical institute exploitation, replaces
Benzamides use the TMB-5 of Shanxi chemical institute exploitation.
The present invention is further arranged to: first auxiliary agent includes the raw material of following weight percent meter: maleic acid modified
Rosin resin 30-40%, polypropylene glycol ether 20-30%, polyisobutene 10-20%, ethylenediamine 6-10%, fluorine ether 0.6-1%, have
Machine montmorillonite 1-3% and water surplus.
By using above-mentioned technical proposal, plastic injection after processing is completed, will do it demoulding.But due to the change of process conditions
Change fluctuation, also will appear plastic injection fabricated product sometimes and demould difficult phenomenon.To ensure that plastic injection fabricated product is injected into
Type production is gone on smoothly, and avoids causing injected-formative plastic injection molding system because the demoulding of plastic injection fabricated product is difficult
The extension of product production cycle, in injected-formative plastic injection molding production of articles, mold cavity surface will spray or rub one layer and take off
Mould agent.
Release agent is a kind of functional materials between mold and finished product.Release agent is chemically resistant, with difference
It is not dissolved when the chemical analysis contact of resin.Release agent also has heat-resisting and stress performance, is not easily decomposed or wears；Release agent
It is adhered on mold and is not transfer on processed product, do not interfere spray painting or other secondary machining operations.Have by being added
Machine montmorillonite can improve compactness, slickness and the uniformity of release agent film forming, while enhance heatproof, corrosion resistant, resistance to again
Impact capacity effectively improves the quality of plastic casing, great popularizing value.
Maleic acid modified rosin resin and organo montmorillonite are also used as the presence of nucleating agent, make in compression molding,
The crystallization rate of product is improved, knot product density is increased and promotes fine grain size, shortens molding cycle.Maleic acid changes simultaneously
Property rosin resin can also with odium stearate occur synergy, improve the service efficiency of nucleating agent.
Maleic acid modified rosin resin also known as maleficent acid resin, by after rosin and maleic anhydride addition reaction simultaneously
With irregular transparent sheet-like solid prepared by glycerol or pentaerythrite esterification.
It selects fluorine ether as special solvent, quick-drying purpose after demoulding may be implemented.
Ethylenediamine improves the dissolubility of raw material as the presence of solvent, while can make the presence of emulsifier and dispersing agent,
The dispersibility between each raw material is improved, the first auxiliary agent is made to form the solution of stable homogeneous.
The present invention is further arranged to: the operating procedure of plastic pellet is prepared in the step S1 are as follows:
1) nano-calcium carbonate calcium powder, odium stearate and calcium carbonate crystal whisker are mixed and stirred in proportion uniformly, it is mixed forming first
Close object；
2) polybutylene terephthalate (PBT), polyethylene terephthalate, polyamide, random copolymerization are gathered in proportion
Propylene, nucleating agent, phosphite ester, dilauryl thiodipropionate, citrate, benzophenone are mixed and the first mixed liquor is mixed
Merging stirs evenly, and forms the second mixture；
3) by the second mixture and glass fibre, melting mixing, extruding pelletization obtain plastic pellet.By using above-mentioned skill
Art scheme after odium stearate is first sprayed at calcium carbonate crystal whisker outer surface, then each raw material is mixed, keeps odium stearate uniform
Be attached to calcium carbonate crystal whisker outer surface, improve the activation of calcium carbonate crystal whisker, prevent odium stearate and calcium carbonate crystal whisker from directly adding
Enter in raw material, cause odium stearate bad to the activation effect of calcium carbonate crystal whisker, influences calcium carbonate crystal whisker and the nucleation of raw material is made
With.
The present invention is further arranged to: the operating procedure of the first auxiliary agent is prepared in the step 2 are as follows:
1) polypropylene glycol ether, polyisobutene, ethylenediamine and water are mixed in proportion, form third mixture；
2) maleic acid modified rosin resin, fluorine ether and organo montmorillonite are added in third mixture in proportion, are mixed
Stirring, obtains the first auxiliary agent.
By using above-mentioned technical proposal, since polypropylene glycol ether, polyisobutene need at high temperature, can just melt,
Maleic acid modified rosin resin and organo montmorillonite are added separately to polypropylene glycol ether, polyisobutene, prevent polypropylene glycol ether,
For polyisobutene in maleic acid modified rosin resin and organo montmorillonite due to high temperature, crystallization effect is violent, cause polypropylene glycol ether,
Polyisobutene reduces the stripping result of product.
In conclusion advantageous effects of the invention are as follows:
1, by polyethylene terephthalate and PA polybutyleneterephthalate in maleic anhydride modified polypropylene and
Under the action of nucleating agent, accelerate crystalline rate, increase crystal density, improves stability when sensor outer housing molding, improve and pass
The rigidity and wearability of sensor shell；
2, there is the first auxiliary agent by being added, make plastic injection after processing is completed, it is conveniently stripped, reduce production sensor outer housing
Defect rate；
3, there is beta crystal-type nucleater by being added, improve sensor outer housing in room temperature and low temperature impact strength.
Specific embodiment
Embodiment one
Plastic pellet includes the raw material of following components by weight percent: 40 parts of polybutylene terephthalate (PBT), poly terephthalic acid
35 parts of glycol ester, 50 parts of polyamide, 25 parts of atactic copolymerized polypropene, 20 parts of glass fibre, 8 parts of calcium carbonate crystal whisker, nucleating agent 8
Part, 8 parts of nano-calcium carbonate calcium powder, 3 parts of citrate, 3 parts of benzophenone, 0.3 part of odium stearate, 0.3 part of phosphite ester, thio two
0.15 part of propionic acid dilauryl.
Nucleating agent includes alpha-crystal form nucleating agent and beta crystal-type nucleater, and alpha-crystal form nucleating agent accounts for 40%, β of nucleating agent total weight
Crystal-type nucleater accounts for the 60% of nucleating agent total weight.
Alpha-crystal form nucleating agent includes the raw material of following weight percent meter: sodium benzoate 35%, maleic anhydride 40%, neatly
Stone 25%.
β crystalline substance nucleating agent is in the TMB-4 using the exploitation of Shanxi chemical institute.
First auxiliary agent includes the raw material of following weight percent meter: maleic acid modified rosin resin 35%, polypropylene glycol ether
25%, polyisobutene 15%, ethylenediamine 8%, fluorine ether 0.8%, organo montmorillonite 2% and water surplus.
Organo montmorillonite uses stearyl dimethyl benzyl ammonium chloride for modifying agent, to the modified gained of natural montmorillonite.
A kind of preparation process of sensor outer housing, comprises the following steps that:
S1 prepares plastic pellet:
1) 8 parts of nano-calcium carbonate calcium powders, 0.3 part of odium stearate and 8 parts of calcium carbonate crystal whiskers are mixed and stirred for uniformly, forming the
One mixture；
2) by 40 parts of polybutylene terephthalate (PBT)s, 35 parts of polyethylene terephthalates, 50 parts of polyamide, 25 parts
Atactic copolymerized polypropene, 1.12 parts of sodium benzoates, 1.28 parts of maleic anhydrides, 0.8 part of hydrotalcite, 4.8 parts of TMB-4, phosphite esters
0.3 part, 0.15 part of dilauryl thiodipropionate, 3 parts of citrates, 3 parts of benzophenone are mixed and the mixing of the first mixed liquor simultaneously
It stirs evenly, forms the second mixture；
3) by the second mixture and 20 parts of glass fibres, melting mixing, extruding pelletization obtain plastic pellet；
S2 prepares the first auxiliary agent:
1) by weight percentage by 25% polypropylene glycol ether, 15% polyisobutene, 8% ethylenediamine, Yi Jishui
It is mixed, forms third mixture；
2) 35% maleic acid modified rosin resin, 0.8% fluorine ether and 2% organic illiteracy are taken off by weight percentage
Soil is added in third mixed liquor, is mixed, is obtained the first auxiliary agent；
S3: the first auxiliary agent obtained in S2 is sprayed on mold；
S4: plastic pellet obtained in S1 is melted into the mold in S3 by injection molding machine and is pressed and molded outside to get sensor
Shell.
Embodiment 2-5 the difference from embodiment 1 is that: each component is calculated by weight as following table in plastic pellet:
Embodiment 6-9 the difference from embodiment 1 is that: each component is following table by weight percentage in nucleating agent:
Embodiment 10-13 the difference from embodiment 1 is that: under each component is by weight percentage in alpha-crystal form nucleating agent
Table:
| Embodiment | Embodiment 10 | Embodiment 11 | Embodiment 12 | Embodiment 13 |
| Sodium benzoate | 30% | 33% | 37% | 40% |
| Maleic anhydride | 50% | 40% | 40% | 30% |
| Hydrotalcite | 20% | 27% | 23% | 30% |
Embodiment 14-17 the difference from embodiment 1 is that: each component is following table by weight percentage in the first auxiliary agent:
Embodiment 14-17 the difference from embodiment 1 is that: each component is following table by weight percentage in β crystalline substance nucleating agent:
Comparative example 1 the difference from embodiment 1 is that: beta crystal-type nucleater has not been added.
Comparative example 2 the difference from embodiment 1 is that: in alpha-crystal form nucleating agent do not include have maleic anhydride.
Comparative example 3 the difference from embodiment 1 is that: in plastic pellet do not include have atactic copolymerized polypropene.
Comparative example 4 the difference from embodiment 1 is that: in step 1, in proportion by nano-calcium carbonate calcium powder, odium stearate,
Calcium carbonate crystal whisker, polybutylene terephthalate (PBT), polyethylene terephthalate, polyamide, atactic copolymerized polypropene, at
After core agent, phosphite ester, dilauryl thiodipropionate, citrate, benzophenone are mixed evenly, then with glass fibers
Dimension, melting mixing, extruding pelletization obtain plastic pellet.
Comparative example 5 the difference from embodiment 1 is that: without step 2 and 3.
Comparative example 6: using common release agent in the market, the produced DOW CORNING demoulding of example Nanjing Dan Pei Chemical Co., Ltd.
Agent.
Comparative example 7: using common plastic pellet sensor outer housing, example Shantou City Bo Taide plastic products have in the market
Limit the produced rich Taide PET plastic particle of responsible company.
Comparative example 8 the difference from embodiment 1 is that: without PBT material.
Comparative example 9 the difference from embodiment 1 is that: without PET material.
(1) by embodiment 1-3, embodiment 19, the obtained 13 groups of sensor outer housings of the method that comparative example 1-9 is provided, every group
Sensor outer housing 1000, measure every group made from sensor outer housing qualification rate.
(2) by embodiment 1-3, embodiment 19, sensor outer housing made from comparative example 1-9 carries out following test:
Frictional behaviour: frictional behaviour is tested according to ASTM G99-05, and observes rubbing surface；
Impact strength (KJ/m2): impact strength is according to " the survey of GB/T 1043.1-2008 plastics Charpy Impact performance
It is fixed " it is measured；
Tensile strength (MPa): tensile strength is surveyed according to " measurement of GB/T 1040.1-2006 plastic tensile performance "
It is fixed；
Anti-aging test: being immersed in 8h in 100 DEG C of deionized waters for sensor outer housing, and impact strength and drawing are tested after taking-up
Intensity is stretched, record stretches degree of aging and impact aging degree:
Stretch ageing rate=aging post-tensioning intensity/initial tensile strength * 100%；
Impact strength/initial impact intensity * 100% after impact aging rate=aging.
Test result see the table below:
As seen from the above table: the produced sensor outer housing of the present invention has dimensional stability high, and mechanical performance is excellent, wearability
Good, product structure is stablized, and intensity is high, and friction factor is small, good with the matching degree of other parts, is not susceptible to deformation, and qualification rate is high.
Embodiment 1 and comparative example 1 compare it is found that the impact strength for having beta crystal-type nucleater that sensor outer housing can be improved is added
And wearability, while the qualification rate for doing product can be proposed.
Embodiment 1 and the comparison of comparative example 2 and comparative example 3 are it is found that being added has maleic anhydride and atactic copolymerized polypropene to be copolymerized
The maleic anhydride modified polypropylene that grafting generates can accelerate crystalline rate, increase crystal density, improve stability when molding,
Improve the rigidity and wearability of product.
After embodiment 1 and comparative example 4 compare it is found that odium stearate is first sprayed at calcium carbonate crystal whisker outer surface, then will be each
Raw material mixing, can increase crystal density, improve stability when molding, improve the rigidity and wearability of product.
Embodiment 1 and comparative example 5 compare it is found that by being coated with the first auxiliary agent on mold, plastic injection can be made to add
It is conveniently stripped after the completion of work, reduce the defect rate of production sensor outer housing.
Embodiment 1 is compared with comparative example 6 it is found that the stripping result ratio of produced first auxiliary agent of the present invention is common in the market
Release agent effect is preferable, and the rigidity and wearability of product can be improved.
Embodiment 1 and comparative example 7-9 are compared it is found that the good product effect as made from being blended PBT and PET and in the market
Common plastic pellet, and individually PBT or PET, alloy made from PBT and PET blending and modifying can be learnt from other's strong points to offset one's weaknesses, comprehensive
Better performances are closed, simultaneously because PET is inexpensively, additionally it is possible to save cost.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of preparation process of sensor outer housing, which is characterized in that comprise the following steps that:
S1: preparing plastic pellet, and the plastic pellet includes the raw material of following components by weight percent: polybutylene terephthalate (PBT)
30-50 parts, 25-45 parts of polyethylene terephthalate, 40-60 parts of polyamide, 15-25 parts of glass fibre, calcium carbonate crystal whisker
5-10 parts, 5-10 parts of nucleating agent, 0.1-0.5 parts of odium stearate, 0.1-0.5 parts of phosphite ester, dilauryl thiodipropionate
0.1-0.2 parts;
S2: the first auxiliary agent of preparation；
S3: the first auxiliary agent obtained in S2 is sprayed on mold；
S4: plastic pellet obtained in S1 is melted, and is pressed and molded by the mold in S3 to get sensor outer housing.
2. the preparation process of sensor outer housing according to claim 1, it is characterised in that: also include in the plastic pellet
Following raw material: 20-30 parts of atactic copolymerized polypropene, 6-10 parts of nano-calcium carbonate calcium powder, 1-5 parts of citrate, hexichol first
1-5 parts of ketone.
3. the preparation process of sensor outer housing according to claim 1, it is characterised in that: the nucleating agent includes following heavy
Measure the raw material of percentages: alpha-crystal form nucleating agent 30-50%, beta crystal-type nucleater 50-70%.
4. the preparation process of sensor outer housing according to claim 3, it is characterised in that: the alpha-crystal form nucleating agent includes
The raw material of following weight percent meter: sodium benzoate 30-40%, maleic anhydride 30-50%, hydrotalcite 20-30%.
5. the preparation process of sensor outer housing according to claim 3, it is characterised in that: the beta crystal-type nucleater includes
Substituted aromatic amide class replaces the one or more of benzamides.
6. the preparation process of sensor outer housing according to claim 1, it is characterised in that: first auxiliary agent includes following
The raw material of weight percent meter: maleic acid modified rosin resin 30-40%, polypropylene glycol ether 20-30%, polyisobutene 10-20%,
Ethylenediamine 6-10%, fluorine ether 0.6-1%, organo montmorillonite 1-3% and water surplus.
7. the preparation process of sensor outer housing according to claim 1, it is characterised in that: prepare plastics in the step S1
The operating procedure of particle are as follows:
1) nano-calcium carbonate calcium powder, odium stearate and calcium carbonate crystal whisker are mixed and stirred in proportion uniformly, forming the first mixture；
2) in proportion by polybutylene terephthalate (PBT), polyethylene terephthalate, polyamide, random copolymerization poly- third
Alkene, nucleating agent, phosphite ester, dilauryl thiodipropionate, citrate, benzophenone are mixed and the first mixed liquor mixes
And stir evenly, form the second mixture；
3) by the second mixture and glass fibre, melting mixing, extruding pelletization obtain plastic pellet.
8. the preparation process of sensor outer housing according to claim 1, it is characterised in that: prepare first in the step 2
The operating procedure of auxiliary agent are as follows:
1) polypropylene glycol ether, polyisobutene, ethylenediamine and water are mixed in proportion, form third mixture；
2) maleic acid modified rosin resin, fluorine ether and organo montmorillonite are added in third mixture in proportion, are mixed,
Obtain the first auxiliary agent.
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