CN202556809U - Light sandwich structure composite product - Google Patents
Light sandwich structure composite product Download PDFInfo
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- CN202556809U CN202556809U CN2012201477762U CN201220147776U CN202556809U CN 202556809 U CN202556809 U CN 202556809U CN 2012201477762 U CN2012201477762 U CN 2012201477762U CN 201220147776 U CN201220147776 U CN 201220147776U CN 202556809 U CN202556809 U CN 202556809U
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Abstract
The utility model discloses a light sandwich structure composite product. The utility model belongs to the field of materials, in particular to a resin matrix composite material. The light sandwich structure composite product is prepared by using a jute weft knitted biaxial fabric as a surface layer, using straw core materials as a middle layer and carrying out hot pressing on the fabric, the core materials and polypropylene short fibers. The fabric on the surface layer of the composite product can sufficiently play the characteristics of high strength and high modulus of yarns and also has the unique and excellent formability. The straw core layer has the characteristics of rich resources, low density, easiness for compression, heat insulation and the like. As renewable natural plant fibers, reproducible jute fibers disclosed by the utility model not only can be used as substitute goods of wood, but also can partly replace synthetic fibers such as glass and the like. The light sandwich structure composite product prepared by the utility model can meet the common mechanical property requirement, can be used as a non-bearing structure and partly-bearing structure part particularly on the aspect of civilian use, such as an upholstery material and the like, and has wide development prospect.
Description
Technical field
The invention belongs to field of materials, particularly a kind of polymer matrix composites.
Background technology
Lightweight sandwich structure composite develops swift and violent owing to have the characteristic of " high-strength light " in nearly decades.The core filled composite material structure is called " sandwich structure " visually, and this structure generally is the composite of being processed by trilaminate material, and the surface layer up and down of this material is high strength, high modulus material, and intermediate layer (core) is thicker light material.At present, the sandwich material that is used for composite " sandwich " structure mainly contains four big types of cardiac stimulant felt, rigid foam, honeycomb and cork woods.Rigid foam mainly contains polyvinyl chloride (PVC), polyurethane (PU), PEI (PEI) and acrylonitrile one styrene (SAN or AS), Polymethacrylimide (PMI), thermoplastic polyethylene (PET) etc.The cellular sandwich material has glass cloth honeycomb, NOMEX honeycomb, cotton honeycomb, aluminium honeycomb etc.The intensity of honeycomb sandwich construction is high, good rigidly, but honeycomb is an open-celled structure, little with the bond area of upper and lower panel, adhesive effect does not generally have foam good.The cork wood sandwich material is a kind of natural prodcuts, and the common cork wood sandwich in market is the Balsa cork wood, and its fiber has good intensity and toughness, is particularly suitable for composite material sandwich structure.
The research and the production of sandwich structure (sandwich), so far existing six more than ten years historical, nineteen forty-three Britain professor Hai Er adopts the wing of sandwich design aircraft for the first time, its surperficial usefulness be Mahogany, what sandwich material was used is Barcelona wood.Be prone to moist, perishable and fire-hazardous shortcoming in order to improve timber, the U.S. thousand Si Wote aircraft companies have adopted aluminum sheet to do the surface when making " dirk formula " aircraft wing.Development along with composites such as fiberglass; All good frp honeycomb sandwich of hear resistance and electrical property and glass fiber reinforced plastic foam sandwich have been succeeded in developing; Use at aspects such as aircraft, boats and ships, vehicle, buildings increases year by year, and has become radome production application specific architecture material.The sandwich structure sandwich material of making panel with carbon fiber, boron fiber composite appears in aviation, the aerospace industry in a large number.In recent years, no matter core filled composite material was in output, sales volume or at aspects such as production technology, production technology, new-product developments, had all obtained fast development.
Textile structural composite materials is owing to its excellent mechanical property and relatively low price, and its application almost is penetrated into every field, like fields such as Aero-Space, car and boat manufacturing, building trade, health care, sports goods.In order to reduce in the braiding process to the damage of fiber and because flexing reduces the load effect, people adopt the enhancing body of no flexing fabric (non-crimp Fabric, abbreviation NCF) as composite material for weaving.NCF is made up of the fiber bundle layer that on specific direction, is arranged in a linear, and fibre bundle is arranged with root of specific direction, and uses thinner yarn to be fixed with knitting method.The NCF fabric is except reducing the damage to fiber; Also improved performance on interlaminar shear strength, damage tolerance, the thickness direction etc.; Enhancing structure as composite; It had both overcome the problem that yarn property utilization rate that woven fabric causes because of the yarn flexing reduces, and had improved laminated fabric again and in use had been easy to the defective of interlayer cracking, thereby had a vast potential for future development.
The present invention with jute weft knitting twin shaft to lining yarn woven fabric (Multi-layered Biaxial Weft Knitted Fabrics; MBWK; Promptly be to utilize knitting fundamental line coil structures to be strapped in the fabric through broadwise jute lining yarn straightly; Make two axial lining yarns present straight configuration, strengthen the property thereby bring into play it to greatest extent.As the surface layer up and down of lightweight sandwich structure, as the main support member of this sandwich structure composite.The weft knitting twin shaft has excellent tensile properties and good formability to lining yarn woven fabric bi-axial fabric, is that the good composite material for weaving of present combination property strengthens structure.
Chinese sorghum class straw is a natural material that is worth exploitation, and its stalk core material aboundresources has light weight, cheapness and easy machining characteristics.This traditionally stalk is all made the feed of fuel or animal, and its exploitation also only is confined on fuel and the feed.The straw core material is porous or tubular arrangement structure.This structures shape its have low-density, be prone to compression, characteristic such as heat insulation.The present invention uses its sandwich material as composite according to the characteristic of stalk core material.It is the same as the function of interlayer with wood materials, but the stalk core material is lighter, and is softer, also more is prone to processing, and it can directly add compression molding in the material, and core material can be pressed into any grinding tool shape during moulding.Tossa is a kind of bast fiber, comes from nature, environmental sound, biodegradable, and is cheap, has higher specific modulus, specific strength, is fit to make the composite material reinforcement body of higher load bearing requirements.China's jute aboundresources; Applicating history is long; Adopt the jute natural fiber to substitute or replace the enhancing body of materials such as timber, glass fibre, at environment purification, prevent to pollute, substitute harmful substance, reduce discarded object and effectively utilize the aspects such as renewable resources of natural resources and material to have positive effect as polymer composites.
The utility model content
The present invention provides a kind of lightweight sandwich structure composite products.
Said lightweight sandwich structure composite products with jute weft knitting bi-axial fabric be about surface layer, with the lightweight sandwich structure composite of Chinese sorghum class straw core material as the intermediate layer;
Said lightweight sandwich structure composite products is got to knitted fabric surface layer and stalk core material and the hot pressing of polypropylene short fiber by jute weft knitting twin shaft; Said lightweight sandwich structure composite products hot strength is 23.5-50.2Mpa, and bending strength is 32.6-75.2Mpa;
Being respectively through broadwise lining yarn density of said jute weft knitting bi-axial fabric: 12 pieces/inch of warp counts, weft count are 24 pieces/inch.Be organized as the 1+1 rib-loop fundamentally, play the effect of bondage through broadwise jute lining yarn.Weft yarn is gripped by the loop pillar of rib construction, and the laying-in yarn is by the stuffer weft clamping on two sides, and said laying-in yarn and stuffer weft are tossa lining yarn, and the tossa lining yarn in the fabric is straight configuration.
Said jute weft knitting twin shaft to knitted fabric and stalk core material with polypropylene short fiber mass ratio be 1: 1-2.3.
Said jute weft knitting twin shaft to knitted fabric and stalk core material with polypropylene short fiber mass ratio be 1: 1.5.
Said jute weft knitting twin shaft to knitted fabric and stalk core material with polypropylene short fiber mass ratio be 1: 2.3.
Said Chinese sorghum class straw core preparation method for material is following: it is some to choose the close stalk of fineness degree, and the outer sclerderm of stalk is peeled off totally, and it is subsequent use that the stalk core material is cut into the segment with certain average length.Use the Jute thread and yarn identical to wear couplet these stalk core material segments then, make to wear to join the back to arrange width consistent with the sheet material width with the jute bi-axial fabric, thus formation Chinese sorghum class stalk core material.
Said jute weft knitting twin shaft is a layer 2-4 to the knitted fabric surface layer shop number of plies.
The said straw core bed of material shop number of plies is a layer 2-4.
Lightweight sandwich structure method for manufacturing composite products comprises the steps: that described jute weft knitting twin shaft carries out shop, interval layer to knitted fabric, the straw core bed of material and polypropylene short fiber, and megila, stalk sandwich layer upper and lower surface all are covered with one deck polypropylene short fiber; Hot press begins to warm to 60 ℃ from room temperature; Megila, stalk core material and the polypropylene short fiber of shop, above-mentioned interval layer are placed on the hot press; Continue to be warmed up to 90-100 ℃, be forced into (3-8) MPa, pressurize is warming up to 150-170 ℃; Be warming up to 195 ℃ behind the insulation 10min, naturally cool to room temperature behind the heat-insulation pressure keeping 30min and get final product.
Beneficial effect:
Composite products according to the invention compared with prior art, having adopted the jute bi-axial fabric is surface layer, the stalk core material is the intermediate layer, is uniformly mixed to form prefabricated component with the polypropylene short fiber, utilizes heat pressing process to prepare composite.The method easy operating, with low cost, molding cycle is shorter relatively, and product thickness changes easily, does not have generation of waste materials in the preparation process, helps the protection of environment, meets the requirement of green production.
Renewable tossa according to the invention not only can be used as the substitute of timber as the recyclability natural plant fibre, can also partly replace synthetic fibers such as glass.The prepared lightweight sandwich structure fabric reinforced composite of the present invention can satisfy the General Mechanics performance requirement; Particularly aspect civilian; Can be used as non-bearing structure and part load-carrying construction parts,, will have vast potential for future development like upholstery material etc.
The characteristics of jute weft knitting bi-axial fabric are among the present invention: (1) is simple in structure, is easy to the adjustment of machine-shaping and technology; (2) longitude and latitude in the fabric serves as a contrast the straight arrangement of yarn, can give full play to the strength and stiffness of fiber; Increase the tensile mechanical properties of composite; (3) be fit to various yarns, have good designability and shuffling property.
Jute weft knitting twin shaft of the present invention to the manufacturing approach that serves as a contrast yarn woven fabric has compared with prior art been chosen the primary raw material of jute as weft-knitted bi-axial fabric, can make full use of jute excellent mechanical property and resources advantage; And utilize weft-knitted biax weaving method to process jute weft knitting twin shaft to the lining yarn woven fabric, and cost of material is cheap, can save production cost, and the enhancing body of the environment-friendly composite material of development of new high-quality does not produce chemical waste, environmentally safe simultaneously.
Lightweight sandwich structure composite products according to the invention has the two-way lining yarn woven fabric in top layer at warp-wise and broadwise excellent mechanical property and EAC, and characteristics such as lightweight of core material, insulation, sound insulation, easy-formation.
Description of drawings:
Fig. 1 lightweight sandwich structure composite products
The specific embodiment
Jute according to the invention weft knitting bi-axial fabric utilizes weft-knitted twin shaft that this school composite developed to lining yarn machine (Liang Ziqing; Qiu Guanxiong; The exercise question that publishes thesis such as Zhou Qing is the ballisticimpact response of weft-knitted bi-axial fabric composite, textile journal, 2010; Vol.24 (12): 37:39.) carry out the braiding of jute weft knitting bi-axial fabric, wherein introduced weft-knitted twin shaft to lining yarn machine.
Be woven into as the twin shaft of surface layer to lining yarn woven fabric (12 pieces/inch of warp counts, weft count are 24 pieces/inch), bondage is organized as the 1+1 rib-loop, and bondage tissue 3 is the terylene bundled yarn.To serving as a contrast yarn woven fabric as surface layer, the stalk core material is that layer is spread in the intermediate layer, and is as shown in Figure 1 with this twin shaft.The even lay acrylic resin short fiber of upper and lower surface difference at this fabric and stalk sandwich layer.
Lightweight sandwich structure composite products according to the invention adopts described jute bi-axial fabric and stalk core material as the enhancing body of composite, adopts hot-press method to make composite board with the acrylic resin short fiber.The method of manufacturing lightweight sandwich structure composite according to the invention is: adopt above-mentioned jute weft knitting twin shaft to knitted fabric as surface layer, with the quality proportioning of the difference shop number of plies (layer 2-4) and stalk core material and resin (1: 1-1: 2.3) prepare the lightweight sandwich composite board of different process respectively.
Specific embodiment:
Embodiment 1: combine Fig. 1 explanation:
Said lightweight sandwich structure composite products is made up of the bilevel jute weft knitting bi-axial fabric 1 and the intermediate layer straw core bed of material 2;
The preparation process is following: surface layer about with 2 layers of jute weft knitting bi-axial fabric being; Jute weft knitting bi-axial fabric and stalk core material carry out hot pressing with the polypropylene short fiber according to 1: 1 ratio of mass ratio for 2 layers and prepare the light compound material board material, and the hot pressing temperature constant interval is 60 ℃-195 ℃.
Described jute weft knitting twin shaft carries out interval to knitted fabric and stalk core material and polypropylene short fiber to be spread layer, and every layer of megila, stalk layer two sides all are covered with one deck polypropylene short fiber; Hot press is heated to 60 ℃, and the megila of shop, above-mentioned interval layer and stalk and polypropylene short fiber are placed on the hot press, is warmed up to 100 ℃; Be forced into 3MPa; Pressurize is warming up to 160 ℃, is warming up to 195 ℃ behind the insulation 10min, naturally cools to room temperature behind the heat-insulation pressure keeping 30min and gets final product.
Composite board performance test of lightweight sandwich structure and result
For the lightweight sandwich structure composite products of said preparation, the gently about 10-25% of its weight ratio same thickness jute knitted fabric RPP laminated composite.Stretch and bending property is the important mechanical property of fundamental sum of composite, it can reflect that the composite opposing is extraneous and stretch and the power of bending force destruction ability.According to being applicable to fibre reinforced composites national standard (GB1447-83) at present and (GB1499-83) respectively different process sheet material being tested.Can know from test result analysis, be 23.5-50.2Mpa for the enhancing sheet material hot strength of different quality proportioning and the different surface layer and the sandwich layer number of plies, stretch modulus 2.1-4.9Gpa; Bending strength is 32.6-75.2Mpa, bending modulus 2.9-7.6Gpa.
Lightweight sandwich structure composite products mechanical property according to the invention is higher than wooden slashings hot strength 15-18Mpa commonly used, stretch modulus 1.0-2.4Gpa (Zheng Rong, Xian Xingjuan; Ye Yingwei, etc. tossa/its performance evaluation of epoxy composite material base [J]. composite journal, 1995; (1): 18-24.)), meets or exceeds similar string reinforced composite and (specifically see Wang Rui, Jiao Xiaoning; Guo Bingchen; Deng. the research and development of flax fiber non-weaving cloth composite material [J]. textile journal, 2003, (5): 15-17; Ceng Jingcheng, Xiao Jiayu, Liang Chongyun, etc. tossa strengthens polymer composites process and performance research [J]. fiberglass/composite .2001, (3): 30-33; Liu Liyan; Yellow so. preparation technology is to the influence of flax reinforced polypropylene compound material tensile property. engineering plastics are used .2005.Vol.33 (10): 24-27. etc.), the characteristics such as its light weight, inexpensive, sound insulation and insulation that can make full use of simultaneously are used for civilian and the decoration field.
Claims (4)
1. lightweight sandwich structure composite products, said lightweight sandwich structure composite with jute weft knitting bi-axial fabric be about surface layer, Chinese sorghum class straw core material is the intermediate layer.
2. a kind of according to claim 1 lightweight sandwich structure composite products; It is characterized in that being respectively of said jute weft knitting bi-axial fabric: 12 pieces/inch of warp counts through broadwise lining yarn density; Weft count is 24 pieces/inch, is organized as the 1+1 rib-loop fundamentally, and weft yarn is gripped by the loop pillar of rib construction; The laying-in yarn is by the stuffer weft clamping on two sides, and said laying-in yarn and stuffer weft are tossa lining yarn.
3. lightweight sandwich structure composite products according to claim 1 is characterized in that said jute weft knitting twin shaft is a layer 2-4 to the knitted fabric surface layer shop number of plies.
4. lightweight sandwich structure composite products according to claim 1 is characterized in that the said straw core bed of material shop number of plies is a layer 2-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201477762U CN202556809U (en) | 2012-04-10 | 2012-04-10 | Light sandwich structure composite product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201477762U CN202556809U (en) | 2012-04-10 | 2012-04-10 | Light sandwich structure composite product |
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| Publication Number | Publication Date |
|---|---|
| CN202556809U true CN202556809U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201477762U Expired - Fee Related CN202556809U (en) | 2012-04-10 | 2012-04-10 | Light sandwich structure composite product |
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| Country | Link |
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| CN (1) | CN202556809U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181647A (en) * | 2019-06-17 | 2019-08-30 | 南京林业大学 | A kind of preparation method of rice straw thermal insulation material |
-
2012
- 2012-04-10 CN CN2012201477762U patent/CN202556809U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181647A (en) * | 2019-06-17 | 2019-08-30 | 南京林业大学 | A kind of preparation method of rice straw thermal insulation material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20130410 |