CN101768360A - Technique for manufacturing pneumatic wing plate for bridge - Google Patents
Technique for manufacturing pneumatic wing plate for bridge Download PDFInfo
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- CN101768360A CN101768360A CN200910265051A CN200910265051A CN101768360A CN 101768360 A CN101768360 A CN 101768360A CN 200910265051 A CN200910265051 A CN 200910265051A CN 200910265051 A CN200910265051 A CN 200910265051A CN 101768360 A CN101768360 A CN 101768360A
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- wing plate
- glycidyl methacrylate
- polyphenylene sulfide
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- random ethylene
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Abstract
The invention discloses a technique for manufacturing a pneumatic wing plate for a bridge. A pneumatic wing plate envelope for the bridge consists of a polyphenylene sulfide ether resin composite material which mainly comprises the following main components in percentage by weight: 50 to 55 percent of polyphenylene sulfide ether resin, 3 to 5 percent of random ethylene-acrylic ester-glycidyl methacrylate terpolymer, 2 to 5 percent of random ethylene-glycidyl methacrylate dipolymer, 35 to 40 percent of glass fiber, 50 to 55 percent of polyphenylene sulfide ether resin, 3 to 5 percent of random ethylene-acrylic ester-glycidyl methacrylate terpolymer and 2 to 5 percent of random ethylene-glycidyl methacrylate dipolymer. After the components are mixed in a dry state, the injection molding of the envelope is completed by using a homodromous double-screw multi-gating hot-runner mold. The technique solves the deformation problem of the wing plate envelope well, improves the manufacturing efficiency and lowers the production cost on the premise of ensuring that the wing plate has enough intensity.
Description
Technical field
The invention belongs to the engineering polymer composite, especially the bridge pneumatic wing plate is made the field with the engineering structural composite material.
Background technology
Because the demand of technical progress and Modern Traffic transportation, build increasing Longspan Bridge and become inexorable trend, the lengthening in bridge span footpath makes structure greatly strengthen the sensitivity of wind, avoid the zitterbewegung of structure generation diversity also therefore to become the problem that to pay close attention in the long-span bridge beam design process, in bridge structure flutter and buffeting solution, pneumatic wing plate is being played the part of very important role.Used aluminium alloy as the wing plate covering, aluminum alloy materials has good processing forming, high intensity in the past, but the electropotential of aluminium is very negative, so aluminium produces serious galvanic corrosion as anode when contacting with dissimilar metal easily; The linear expansivity of aluminium alloy is exposed to the field and is subjected to the impact of temperature big than higher, and dimensional change changes obviously, to connect and seal unfavorable.
Use instead special modified plastics as the wing plate covering after, material property and forming method often become the key issue that restriction is produced.Produce similar thin-walled part in the past and generally adopted press moulding mode, because being glass, material used in the present invention strengthens polyphenylene sulfide, its directivity is stronger, belong to the high-melting-point crystalline polymer, fusing point is higher than 280 ℃, needs the processing temperature more than 300 ℃, can very fast curing in case material temperature is reduced under the fusing point, form duricrust on the surface, cause intensity to reduce, have a strong impact on quality product in the next meeting of situation that the fusion seam is arranged.
If adopt: the modified particles material is pulverized, and--weighing,--------baking oven for heating--produce in formal mold pressing--cooling--by the technology of-depanning in exhaust in precompressed in the baking oven preheating, because the modifying material pulverizing can destroy the length of fiber to a great extent, cause the decline of product mechanical property and the mold process energy consumption is increased; Process using after the improvement is extruded more efficiently, molding interlock mode, that is: the online drying of particulate material, and--single screw rod is extruded--weighs and is incubated--mold pressing--cooling---depanning.This technology can not only reduce damages great pulverizing process to material property, can improve press efficient again, reduce energy loss, can also avoid because of the powder body material poor heat conductivity, required heat-up time is long, and temperature is high and polyphenylene sulfide that cause is partial cross-linked and decompose, and is perhaps short because of heat-up time, temperature is low, plastifies the problem of bad caused product poor mechanical property.Its working (machining) efficiency is estimated to improve several times, and performance also can technology more in the past be greatly improved, but the pneumatic wing plate usage quantity is big, delivery cycle is short, mold pressing can not solve the problem of product warpage, can not satisfy the requirement of duration and cost, needs to seek quick more and mode moulding cheaply.
Summary of the invention
In view of the shortcoming more than the existing mould pressing technology, the objective of the invention is to develop a kind of bridge technique for manufacturing pneumatic wing plate and make it to have good mechanical performance and weathering resistance, solve and adopt usual way to make the serious problem of wing plate skin morph, guaranteeing that wing plate has under enough strength conditions, improve and make efficient, reduce production costs.
The objective of the invention is to realize by following means.
The present invention adopts injection molding to produce the pneumatic wing plate covering.
Technique for manufacturing pneumatic wing plate for bridge, polyphenylene sulfide resin composite material structure bridge pneumatic wing plate covering, the covering forming processing method comprises: based on polyphenylene sulfide, its main component weight percent is: polyphenylene sulfide 50-55, random ethylene-acrylate-glycidyl methacrylate terpolymer 3-5; Random ethylene-glycidyl methacrylate copolymer 2-5, glass fibre 35-40, polyphenylene sulfide 50-55, random ethylene-acrylate-glycidyl methacrylate terpolymer 3-5, random ethylene-glycidyl methacrylate copolymer 2-5, appropriate amount of auxiliary materials are done and are mixed back use parallel dual-screw extruding machine adding glass fibre 35-40, temperature 300-330 ℃, the tie rod pelletizing is extruded in screw speed 350rpm mixing; Adopt many cast gates hot runner mould to finish the covering injection moulding.
The plastics of molten state are under the injection pressure effect, charge into mold cavity and at the die cavity internal cooling, solidify, this process is injection molding key link, in this process, temperature, pressure, the speed three effect of intercoupling has great influence to the quality and the production efficiency of plastic; Material is formed and material property influences also very big to plastic part quality; Product design and die design also are the deciding factors of plastic part quality.The present invention adopts hot runner mould, strengthens polyphenylene sulfide because material used in the present invention is a glass, and its directivity is stronger, belongs to the high-melting-point crystalline polymer, and fusing point is higher than 280 ℃, needs the processing temperature more than 300 ℃.Consider the singularity of plane sheets, the present invention has adopted many cast gates hot runner mould to finish the covering injection moulding.
Product of the present invention has solved wing plate skin morph problem well, guaranteeing that wing plate has under enough strength conditions, has improved manufacturing efficient, reduces production costs.
Description of drawings
Fig. 1 is the Performance Detection table of the embodiment of the invention.
Embodiment
Embodiment 1
Polyphenylene sulfide is that Sichuan Deyang Chemistry Co., Ltd. is with sodium sulphite (Na
2S5H
2O), santochlor (P-DCS) reacts gained in N-Methyl pyrrolidone (NMP), wash dried PPS resin 51 weight parts, through 220-250 ℃ of crosslinking Treatment 2-4h, resin melt is flowed, and (test temperature is 315 ℃ to speed, the nominal load is 5kg, and standard mouth mould internal diameter is 2.095mm) be 200-400g/10min; Random ethylene-acrylate-glycidyl methacrylate terpolymer (the French AX8900 of Atuofeina Corp) 4 weight parts, random ethylene-glycidyl methacrylate copolymer 3 weight parts (the French 29MA03 of Atuofeina Corp); Glass fibre 40 weight parts (the tai shan glass ERS2000-T635B of factory, Fibre diameter 11-13 μ); Black masterbatch is a Cabot UN20142 weight part; Forcing machine is Guanghan, Sichuan SLJ-35B parallel dual-screw extruding machine; The dried back of mixing uses parallel dual-screw extruding machine to add glass fibre 35-40, and temperature 300-330 ℃, the tie rod pelletizing is extruded in screw speed 350rpm mixing; Adopt 6 cast gate hot runner moulds to finish the covering injection moulding.Its material property such as Fig. 1.
Method for testing and detecting
Tensile strength and elongation at break are undertaken by the regulation of GB/T1040.5-2008, and trial speed is 10mm/min.
Flexural strength and modulus in flexure are undertaken by the regulation of GB/T9341-2008.
Cantilever beam impact strength (breach) is undertaken by the regulation of GB/T1843-2008.
Have very good mechanical properties to the compound constituent take polyphenylene sulfide as main body as seen from the above table, thereby guarantee to use successful substitution of Al alloy at the bridge pneumatic wing plate, have than other molding mode and material more outstanding advantage is arranged:
1) the present invention produces mould therefor and adopts the hot flow path design
The hot runner mould principle: hot runner mould is the running channel of traditional type mould or shree plates mold and runner to be in always melt the glue state of temperature, does not need to take out a kind of structure of runner and running channel in each forming period.
When moulding super large goods, must just can make plastic cement have enough length of flow with hot runner, advance to water the simple structure that can make mould in the hot flow path mode, be shaped easily, accelerate forming speed, reduce the stub bar when being shaped, save material, raise the efficiency, reduce cost.
The hot runner mould application item of a success needs a plurality of links to be ensured. Wherein most important have two technical factors. The one, the control of plastics temperature, the 2nd, the control of plastic flow.
The control of plastics temperature: the control of plastics temperature is very important in hot runner mould is used. It is temperature controlled bad that the processing that occurs in many production processes and product quality problem are directed to TOP-TIP. The present invention utilizes the many cast gates of the convenient solution of hot runner mould to advance the advantage of glue problem, can fully guarantee material mold filling temperature equalization, reduces the distortion that causes because of thermograde.
The control of plastic flow: plastics flow in TOP-TIP and want balance, make melt fill synchronously each position of die cavity, and are inadequate such as the position mold filling pressurize that imbalance then can have, the position that the has quality problems such as but the mold filling pressurize is excessive, and overlap is excessive.
2) adopt many cast gates to advance glue
The present invention utilizes die design software that design balance is carried out in running channel size, position, reasonable to guarantee the runner gate size, products production mould gate of the present invention is of a size of 4mm * 6, make channel size neither cause the pressure-losses excessive, also the reason size does not cause the runner volume excessive too greatly, plastics are overstand in hot runner system, and disadvantages such as damaged material performance take place, and is the key factor that obtains good wing plate covering plastic.
3) optimize product design
This wing plate covering initial design is a band hemmed flat board, through evidence, big planar sheet intensity difference, be easy to generate manufacturing defect, being out of shape comparatively seriously, can not satisfying service requirements, is the flanging flat board with six high circular arc horizontal bars of 10mm after optimizing, the test back finds that the wing plate covering has a small amount of distortion, can't handle owing to horizontal bar intensity is too high during installation.Be optimized for once more the horizontal bar camber is reduced to 5mm, through producing and using proof, this is reasonable in design, can increase covering intensity and aesthetics, convenient again the installation.
Claims (2)
1. technique for manufacturing pneumatic wing plate for bridge, polyphenylene sulfide resin composite material structure bridge pneumatic wing plate covering, the covering forming processing method comprises: based on polyphenylene sulfide, its main component weight percent is: polyphenylene sulfide 50-55, random ethylene-acrylate-glycidyl methacrylate terpolymer 3-5; Random ethylene-glycidyl methacrylate copolymer 2-5, glass fibre 35-40, polyphenylene sulfide 50-55, random ethylene-acrylate-glycidyl methacrylate terpolymer 3-5, random ethylene-glycidyl methacrylate copolymer 2-5, the dried back of mixing of appropriate amount of auxiliary materials uses parallel dual-screw extruding machine to add glass fibre 35-40, and the tie rod pelletizing is extruded in screw speed 350rpm mixing; Adopt many cast gates hot runner mould to finish the covering injection moulding.
2. the technique for manufacturing pneumatic wing plate for bridge according to claim 1 is characterized in that, 300-330 ℃ of injection moulding machine temperature, 330 ℃ of hot runner temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910265051A CN101768360A (en) | 2009-12-30 | 2009-12-30 | Technique for manufacturing pneumatic wing plate for bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910265051A CN101768360A (en) | 2009-12-30 | 2009-12-30 | Technique for manufacturing pneumatic wing plate for bridge |
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| Publication Number | Publication Date |
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| CN101768360A true CN101768360A (en) | 2010-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910265051A Pending CN101768360A (en) | 2009-12-30 | 2009-12-30 | Technique for manufacturing pneumatic wing plate for bridge |
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| CN (1) | CN101768360A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967280A (en) * | 2010-09-02 | 2011-02-09 | 中国工程物理研究院化工材料研究所 | Anti-cracking polyphenyl thioether composite material and preparation method thereof |
| CN105656265A (en) * | 2014-11-10 | 2016-06-08 | 博世汽车部件(长沙)有限公司 | Multi-gate multi-direction injection molding of plastic product |
-
2009
- 2009-12-30 CN CN200910265051A patent/CN101768360A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967280A (en) * | 2010-09-02 | 2011-02-09 | 中国工程物理研究院化工材料研究所 | Anti-cracking polyphenyl thioether composite material and preparation method thereof |
| CN105656265A (en) * | 2014-11-10 | 2016-06-08 | 博世汽车部件(长沙)有限公司 | Multi-gate multi-direction injection molding of plastic product |
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Open date: 20100707 |