CN103737939A - Modified preparation technology for light GMT sheet material - Google Patents
Modified preparation technology for light GMT sheet material Download PDFInfo
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- CN103737939A CN103737939A CN201310630735.8A CN201310630735A CN103737939A CN 103737939 A CN103737939 A CN 103737939A CN 201310630735 A CN201310630735 A CN 201310630735A CN 103737939 A CN103737939 A CN 103737939A
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- glass fibre
- sheet material
- hot pressing
- preparation technology
- free glass
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Abstract
A modified preparation technology for a light GMT sheet material comprises: employing base-free glass fiber and low-melting-point modified polypropylene according to a certain weight ratio as raw materials, employing vacuum infiltration technology, placing base-free glass fiber at the bottom of a mold, then paving polypropylene thick resin blocks on glass fiber, sealing with a vacuum bag, in hot environment, employing vacuum technology to suck resin from top to bottom, wherein the mold comprises an injection system, an exhaust system and a heating system, and is carved with grooves for accelerating resin flow, guaranteeing resin smooth flow, exhausting all gas in the mold cavity and thoroughly infiltrating fiber. The preparation technology is high in efficiency, low in equipment cost and small in energy consumption; the whole preparation technology is free of pollution, small in glass fiber damage and high in raw material utilization rate; and the preparation process is simple.
Description
Technical field
The present invention relates to automobile and other vehicles interior material fields, relate in particular to a kind of preparation technology of improved light GMT sheet material.
Background technology
Light GMT sheet material is a kind of thermoplastic glass fiber reinforced composite polypropylene board, it is a kind of advanced composite material (ACM) being composited by continuous Glass Fiber Mat and thermoplastic resin, there is intensity high, impact flexibility is high, and load is good, high temperature resistant, quality is light, reproducible utilization, not yielding, the advantages such as good sound-absorbing and sound insulation, odorlessness.Sheet surface can be selected different surface coverings according to actual requirement, as: glued membrane, Obstruct membrane, ornament, hard polypropylene film, nonwoven, reinforcing material or enrobe not.Be widely used in the fields such as traffic, building, aviation.
At present, wet processing is prepared light GMT sheet material, is to grow up on the basis of papermaking, take foam as dispersion suspension medium, the auxiliary agents such as chopped glass fiber, toner, glass surface conditioning agent, emulsifying agent are added to the water together, form suspension, utilize mechanical agitation waddingization glass.Under Action of Gravity Field, the glass of waddingization formation separation with suspension embryo felt; Embryo felt, through processing steps such as hydrofuge, dry, resin melting plasticizing, compound, sizings, forms light GMT sheet material.The advantage of wet processing is to make glass to wad a quilt with cotton completely and changes into monofilament, resin is better to its dipping effect, and resin easily disperses on fiber.But this technique is only applicable to the glass of 50-80mm, equipment cost is high, and energy consumption is larger, and the production of will just founding the factory in the relatively more rich place of water resource, in production process, the additive such as a large amount of toner, glass surface conditioning agent, emulsifying agent runs off, to environment.Dry process is prepared light GMT sheet material, be to grow up on the basis of producing technology of non-woven fabrics, glass through mix combing system by shredding, be carded to monofilament, and mix uniformly with meldable fibre, form single fiber net; Single fiber net, through lapping machine laying repeatedly, forms the embryo felt with certain grammes per square metre; Embryo felt is through needing machine pinprick reinforcement, and enters heating furnace and make meldable fibre fusion plastification; Last compound cutan and nonwoven, cooling and shaping becomes sheet material.The advantage of dry process is can combing to reach the fiber of 100-150 mm, not discharging waste gas, waste water, and production process is environmentally friendly, but preparation process complexity, glass damage is large, and orientation is obviously, and sheet material mechanical property is anisotropy, and cost is high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of vacuum immersion technology, two-way acupuncture reinforcement means and improved hot-forming parameter of adopting to prepare light GMT sheet material, whole preparation technology is pollution-free, glass damage is little, raw material availability is high, preparation process is simple, and equipment cost is low, energy consumption is little.
The present invention adopts following technical scheme to achieve these goals:
A preparation technology for improved light GMT sheet material, adopts vacuum immersion technology, double-sided needling and improved hot-forming parameter, comprises raw material preparation, vacuum immersion, pinprick reinforcement and hot-forming, and concrete steps are as follows:
(1) raw material is prepared: by weight the ratio that be 6-8:2-4, prepare alkali-free glass fibre and modified polypropylene fiber as raw material, first alkali-free glass fibre is passed through to opener and carry out shredding, then modified polypropene is prepared into thick shape resin mass;
(2) vacuum immersion: adopt the mould with injection, exhaust and heating system, on mould, cutting is to accelerate resin flows, alkali-free glass fibre after shredding in step (1) is placed in to the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, with vacuum bag, seal again, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, by abundant polypropylene sized glass fibres, make base felt;
(3) pinprick reinforcement: the base felt that step (2) is obtained is through needing machine double-sided needling, and needling density is upper and lower 60 thorns/cm
2, punch frequency is 600 pins/min, depth of needling is downwards 7-9mm, is upwards 3-5mm;
(4) hot-forming: the base felt after reinforcing is sent into two Steel-belt Continuous Press, compound cutan and nonwoven, continuous rolling, hot pressing temperature is 130-170 ℃, and hot pressing pressure is 3-6Mpa, and hot pressing time is 1-4min, by composite setting, forms light GMT sheet material.
The weight ratio of the alkali-free glass fibre described in step (1) and modified polypropylene fiber is 7:3.
Hot pressing temperature described in step (5) is 150 ℃, and hot pressing pressure is 5Mpa, and hot pressing time is 3-4min.
Compared with the prior art, beneficial effect of the present invention is as follows:
It is raw material by certain weight proportion that the present invention adopts the modified polypropene of alkali-free glass fibre and low melting point, adopt vacuum immersion technology, alkali-free glass fibre is placed in to the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, with vacuum bag, seal again, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, mould has injection, exhaust and heating system, on mould, cutting is to accelerate resin flows, guarantee that resin flows is smooth and easy and discharge all gas in die cavity and thoroughly infiltrate fiber, it is high to be that one has efficiency, invest low, the preparation method of environmental protection, whole preparation technology is pollution-free, glass damage is little, raw material availability is high, preparation process is simple.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
Adopt 60kg alkali-free glass fibre and 40kg modified polypropylene fiber as raw material, first alkali-free glass fibre is carried out to shredding through opener, then modified polypropene is prepared into thick shape resin mass; Employing has the mould of injection, exhaust and heating system, on mould, carve cannelure to accelerate resin flows, alkali-free glass fibre after shredding is placed in the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, then with vacuum bag sealing, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, by abundant polypropylene sized glass fibres, make base felt, recycling needing machine carries out double-sided needling to base felt, and needling density is upper and lower 60 thorns/cm
2, punch frequency is 600 pins/min, depth of needling is downwards 7mm, is upwards 3mm; Base felt after reinforcing is sent into two Steel-belt Continuous Press, compound cutan and nonwoven, continuous rolling, hot pressing temperature is 130 ℃, and hot pressing pressure is 3Mpa, and hot pressing time is 2min, by composite setting, forms light GMT sheet material.
Embodiment 2:
Adopt 70kg alkali-free glass fibre and 30kg modified polypropylene fiber as raw material, first alkali-free glass fibre is carried out to shredding through opener, then modified polypropene is prepared into thick shape resin mass; Employing has the mould of injection, exhaust and heating system, on mould, cutting is to accelerate resin flows, alkali-free glass fibre after shredding is placed in the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, with vacuum bag, seal again, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, by abundant polypropylene sized glass fibres, make base felt; Recycling needing machine carries out double-sided needling to base felt, and needling density is upper and lower 60 thorns/cm
2, punch frequency is 600 pins/min, depth of needling is downwards 8mm, is upwards 4mm; Base felt after reinforcing is sent into two Steel-belt Continuous Press, compound cutan and nonwoven, continuous rolling, hot pressing temperature is 150 ℃, and hot pressing pressure is 5Mpa, and hot pressing time is 3min, by composite setting, forms light GMT sheet material.
Embodiment 3:
Adopt 80kg alkali-free glass fibre and 20kg modified polypropylene fiber as raw material, first alkali-free glass fibre is carried out to shredding through opener, then modified polypropene is prepared into thick shape resin mass; Employing has the mould of injection, exhaust and heating system, on mould, cutting is to accelerate resin flows, alkali-free glass fibre after shredding is placed in the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, with vacuum bag, seal again, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, by abundant polypropylene sized glass fibres, make base felt; Recycling needing machine carries out double-sided needling to base felt, and needling density is upper and lower 60 thorns/cm
2, punch frequency is 600 pins/min, depth of needling is downwards 9mm, is upwards 5mm; Base felt after reinforcing is sent into two Steel-belt Continuous Press, compound cutan and nonwoven, continuous rolling, hot pressing temperature is 170 ℃, and hot pressing pressure is 6Mpa, and hot pressing time is 4min, by composite setting, forms light GMT sheet material.
Claims (3)
1. the preparation technology of an improved light GMT sheet material, it is characterized in that: adopting alkali-free glass fibre and the modified polypropene of certain weight ratio is raw material, utilize vacuum immersion technology, double-sided needling method and hot-forming, comprise raw material preparation, vacuum immersion, pinprick reinforcement and hot-forming, concrete steps are as follows:
(1) raw material is prepared: by weight the ratio that be 6-8:2-4, prepare alkali-free glass fibre and modified polypropylene fiber as raw material, first alkali-free glass fibre is passed through to opener and carry out shredding, then modified polypropene is prepared into thick shape resin mass;
(2) vacuum immersion: adopt the mould with injection, exhaust and heating system, on mould, cutting is to accelerate resin flows, alkali-free glass fibre after shredding in step (1) is placed in to the bottom of mould, then on glass fibre, lay the thick shape resin mass of polypropylene, with vacuum bag, seal again, under thermal environment, adopt vacuum technique that resin is aspirated from top to bottom, by abundant polypropylene sized glass fibres, make base felt;
(3) pinprick reinforcement: the base felt that step (2) is obtained is through needing machine double-sided needling, and needling density is upper and lower 60 thorns/cm
2, punch frequency is 600 pins/min, depth of needling is downwards 7-9mm, is upwards 3-5mm;
(4) hot-forming: the base felt after reinforcing is sent into two Steel-belt Continuous Press, compound cutan and nonwoven, continuous rolling, hot pressing temperature is 130-170 ℃, and hot pressing pressure is 3-6Mpa, and hot pressing time is 1-4min, by composite setting, forms light GMT sheet material.
2. the preparation technology of improved light GMT sheet material according to claim 1, is characterized in that: the weight ratio of the alkali-free glass fibre described in step (1) and modified polypropylene fiber is 7:3.
3. the preparation technology of improved light GMT sheet material according to claim 1, is characterized in that: the hot pressing temperature described in step (5) is 150 ℃, and hot pressing pressure is 5Mpa, and hot pressing time is 3-4min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310630735.8A CN103737939A (en) | 2013-12-02 | 2013-12-02 | Modified preparation technology for light GMT sheet material |
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| CN201310630735.8A CN103737939A (en) | 2013-12-02 | 2013-12-02 | Modified preparation technology for light GMT sheet material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281119A (en) * | 2016-08-04 | 2017-01-04 | 合肥杰迈特汽车新材料有限公司 | A kind of antifouling high abrasion honeycomb composite cardboard and manufacture method thereof of preventing fires |
| CN106393908A (en) * | 2016-08-30 | 2017-02-15 | 浙江华江科技股份有限公司 | High sound-absorbing type ultralight high-strength GMT composite sheet material |
| CN111497395A (en) * | 2020-04-20 | 2020-08-07 | 宁波拓普集团股份有限公司 | High-strength environment-friendly composite material prepared from microcellular foamed polypropylene |
| CN112606443A (en) * | 2020-11-27 | 2021-04-06 | 合肥杰迈特汽车新材料有限公司 | Processing technology of ultra-light GMT plate |
| CN114164558A (en) * | 2021-11-29 | 2022-03-11 | 通城县同力玻纤有限公司 | Alkali-free glass fiber non-woven fabric and manufacturing method thereof |
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2013
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281119A (en) * | 2016-08-04 | 2017-01-04 | 合肥杰迈特汽车新材料有限公司 | A kind of antifouling high abrasion honeycomb composite cardboard and manufacture method thereof of preventing fires |
| CN106393908A (en) * | 2016-08-30 | 2017-02-15 | 浙江华江科技股份有限公司 | High sound-absorbing type ultralight high-strength GMT composite sheet material |
| CN111497395A (en) * | 2020-04-20 | 2020-08-07 | 宁波拓普集团股份有限公司 | High-strength environment-friendly composite material prepared from microcellular foamed polypropylene |
| CN112606443A (en) * | 2020-11-27 | 2021-04-06 | 合肥杰迈特汽车新材料有限公司 | Processing technology of ultra-light GMT plate |
| CN114164558A (en) * | 2021-11-29 | 2022-03-11 | 通城县同力玻纤有限公司 | Alkali-free glass fiber non-woven fabric and manufacturing method thereof |
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Application publication date: 20140423 |
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