阅读说明：本技术 一种竹麻缠绕复合压力管及其制备方法 (Bamboo-hemp-wound composite pressure pipe and preparation method thereof ) 是由 叶柃 张淑娴 姜夏云 姚毅恒 马建新 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种竹麻缠绕复合压力管及其制备方法,属于竹复合管道技术领域,其竹麻缠绕复合压力管在径向上依次设置有内衬层、结构层和外防护层,且其结构层中包括至少一个麻缠绕单元和至少一个竹缠绕单元,以及麻缠绕单元包括至少两层由麻纤维帘缠绕粘结而成的麻纤维层,竹缠绕单元包括至少两层由竹篾帘缠绕粘结而成的轴向竹篾层；同时,结构层中的麻纤维层和轴向竹篾层的层数之和不少于6层。本发明的竹麻缠绕复合压力管,其结构简单,制备方法便捷,能充分发挥竹材料和麻材料的性能优势,使复合压力管具有较好的抗内压能力和优异的抗外压能力,复合压力管道的环刚度和抗弯折能力大幅提升,管道的适用范围有效扩大,具有较好的实用价值。(The invention discloses a bamboo-hemp wound composite pressure pipe and a preparation method thereof, belonging to the technical field of bamboo composite pipelines, wherein the bamboo-hemp wound composite pressure pipe is sequentially provided with an inner liner, a structural layer and an outer protective layer in the radial direction, the structural layer comprises at least one hemp winding unit and at least one bamboo winding unit, the hemp winding unit comprises at least two fibrilia layers formed by winding and bonding fibrilia curtains, and the bamboo winding unit comprises at least two axial bamboo skin layers formed by winding and bonding bamboo skin curtains; meanwhile, the sum of the layers of the fibrilia layer and the axial bamboo skin layer in the structural layer is not less than 6. The bamboo-hemp wound composite pressure pipe has a simple structure, is convenient and fast to prepare, can fully exert the performance advantages of bamboo materials and hemp materials, has good internal pressure resistance and excellent external pressure resistance, greatly improves the ring stiffness and bending resistance of the composite pressure pipe, effectively enlarges the application range of the pipe, and has good practical value.)

1. A bamboo-hemp wound composite pressure pipe comprises an inner liner layer, a structural layer and an outer protective layer which are sequentially arranged from inside to outside in the radial direction,

the structural layer is formed by winding and bonding at least one hemp winding unit and at least one bamboo winding unit on the pipeline in the radial direction;

the hemp winding unit comprises at least two hemp fiber layers formed by winding and bonding hemp fiber curtains, the bamboo winding unit comprises at least two axial thin bamboo strips layers formed by winding and bonding thin bamboo strips curtains, and in a structural layer at any position of the pipeline, the sum of the number of the hemp fiber layers and the number of the axial thin bamboo strips layers is not less than 6.

2. The bamboo hemp wound composite pressure pipe as claimed in claim 1, wherein the hemp layer is formed by spirally winding and bonding the hemp curtain at a helix angle of 60 ° to 90 °.

3. A bamboo hemp wrapped composite pressure pipe according to claim 1 or 2, wherein two adjacent layers of hemp fibers overlap at a seam.

4. The bamboo and hemp wound composite pressure pipe as claimed in any one of claims 1 to 3, wherein the thickness ratio of the axial bamboo skin layer to the hemp fiber layer is 2:1 to 1.5.

5. The bamboo and hemp wound composite pressure pipe as claimed in any one of claims 1 to 4, wherein the hemp fiber curtain is woven by a plurality of parallel arranged hemp stalks in a braided thread, and the hemp stalks are one or more of ramie, jute, flax, ramie, hemp, radish hemp.

6. The bamboo and hemp wound composite pressure pipe as claimed in any one of claims 1 to 5, wherein the hemp wound unit and the bamboo wound unit are made of the same thermosetting resin during winding and bonding, so that the resin in the structural layer can be cross-linked and cured.

7. The preparation method of the bamboo-hemp wound composite pressure pipe is characterized by comprising the following steps of:

(1) raw material treatment: correspondingly weaving a plurality of bamboo strips placed side by side into a bamboo strip curtain, and weaving hemp stems arranged in parallel into a hemp fiber curtain;

(2) preparing an inner liner layer: coating a release layer on the surface of the die, and arranging an inner liner layer with a certain thickness on the periphery of the release layer;

(3) preparing a structural layer:

firstly, determining the number and the sequence of the hemp winding units and the bamboo winding units according to the performance requirements of the composite pressure pipe wound by bamboo and hemp, and the number of winding layers corresponding to fibrilia layers in the hemp winding units and the number of winding layers corresponding to axial bamboo skin layers in the bamboo winding units;

secondly, correspondingly winding and bonding the hemp winding units by the fibrilia curtain in the pipeline radial direction on the periphery of the inner liner layer, and correspondingly winding and bonding the bamboo winding units by the bamboo skin curtain;

(4) preparing an outer protective layer: and correspondingly arranging an outer protective layer on the periphery of the structural layer, and demolding the molded pipeline from the mold to finish the preparation of the bamboo-hemp wound composite pressure pipe.

8. The method for manufacturing a bamboo hemp wound composite pressure pipe as claimed in claim 7, wherein the hemp fiber curtain is spirally wound at a helix angle of 60 ° to 90 ° while winding and bonding the hemp wound unit.

9. The method for manufacturing a bamboo hemp wound composite pressure pipe according to claim 7 or 8, wherein adjacent two hemp fiber layers are overlapped at the time of winding and bonding the hemp wound unit.

10. The method for manufacturing the bamboo and hemp wound composite pressure pipe as claimed in any one of claims 7 to 9, wherein the hemp stalks are one or more of ramie, jute, flax, ramie, hemp and radish hemp, and after the plurality of hemp stalks are arranged in parallel, a hemp fiber curtain is knitted by weaving threads along a direction perpendicular to an axial direction of the hemp stalks.

Technical Field

The invention belongs to the technical field of bamboo composite pipelines, and particularly relates to a bamboo-hemp wound composite pressure pipe and a preparation method thereof.

Background

In industrial production and daily life, the application of the pipeline structure is very wide, and traditional pipelines such as cement pipes, polyvinyl chloride, polyethylene, polypropylene, glass fiber reinforced plastic pipes, thin iron pipes and the like are generally adopted. The cement pipe is low in cost, low in strength, heavy in weight and easy to leak; polyvinyl chloride, polyethylene and polypropylene pipelines are light, smooth and corrosion-resistant, but are insufficient in rigidity and strength, and raw materials are petrochemical synthetic products; the glass fiber reinforced plastic pipe and the glass fiber reinforced plastic sand inclusion pipe have the advantages of corrosion resistance, high strength and small fluid resistance, but the product adopts a main raw material reinforcing material which is high-energy-consumption glass fiber, resin is a petrochemical synthetic product, and the product and waste materials are not recyclable and are not environment-friendly; the thin steel pipe has the defects of poor corrosion resistance, high energy consumption in the production process, high pollution, environmental pollution and the like. Therefore, it can be seen that the application of the above-mentioned conventional pipeline consumes a large amount of mineral resources, has high energy consumption and high emission, and the resources are not renewable, and does not meet the requirements of energy conservation and environmental protection.

In recent years, with the progress of the preparation technology, more and more pipeline structures prepared by using renewable resources are beginning to be applied, wherein the pipeline structures comprise bamboo-wound composite pipelines and hemp-wound composite pipelines. In the existing patents CN 201434160Y and CN 204852660U, a bamboo fiber winding composite pipe and a hemp winding composite pipe are respectively disclosed, and the two composite pipes are respectively provided with an inner liner, a reinforcing layer and an outer protective layer in the pipe diameter direction from inside to outside in sequence, so that the formed composite pipe has good durability and ring stiffness, can replace the traditional pipeline structure to a certain extent, and the application of the pipeline structure meets the advanced concepts of energy conservation, environmental protection and resource regeneration.

However, researchers found that both of the above applications and subsequent studies of the two composite pipes had more or less disadvantages. The technology for processing the fibrilia raw material is relatively mature, and is widely applied to the fields of automotive upholstery, hemp ropes, articles for daily use and the like, although the tensile strength of the fibrilia is high, the pipeline wound by pure fibrilia can meet the requirement of the internal pressure of the pipeline, and can bear larger radial pressure from inside to outside; however, the ring stiffness of the hemp composite pipe is poor, and only can bear small radial pressure from outside to inside, so that the ring stiffness requirement of a pipeline in various application fields cannot be met, the axial force which the hemp composite pipe can bear is limited, the bending resistance is poor, the application field is further limited, and the value of hemp materials cannot be fully exerted. Meanwhile, although the bamboo-wound composite pipe has good annular rigidity and axial force, and the bamboo skin winding technology is rapidly improved in recent years, the aspects of bamboo skin feeding, lapping technology and the like are not completely mature, so that the control difficulty of the bamboo composite pipe during molding is relatively high, the preparation cost of the pipeline is also high, the performance of the pipeline is difficult to achieve reasonable control, and the application and development of the bamboo composite pipeline are restricted.

Disclosure of Invention

Aiming at one or more of the defects or the improvement requirements in the prior art, the invention provides the bamboo-hemp wound composite pressure pipe and the preparation method thereof, wherein the composite pressure pipe is provided with the structural layer formed by sequentially winding and bonding the bamboo material and the hemp material, so that the composite pressure pipe has better internal pressure resistance, better ring stiffness and bending resistance, the adaptability of the composite pressure pipe prepared from renewable resources is improved, the application range of the composite pressure pipe is expanded, and the preparation cost of the composite pressure pipe is reduced.

In order to achieve the above object, one aspect of the present invention provides a bamboo-hemp wound composite pressure pipe, comprising an inner liner layer, a structural layer and an outer protective layer sequentially arranged from inside to outside in a radial direction, wherein,

the structural layer is formed by winding and bonding at least one hemp winding unit and at least one bamboo winding unit on the pipeline in the radial direction;

the hemp winding unit comprises at least two hemp fiber layers formed by winding and bonding hemp fiber curtains, the bamboo winding unit comprises at least two axial thin bamboo strips layers formed by winding and bonding thin bamboo strips curtains, and in a structural layer at any position of the pipeline, the sum of the number of the hemp fiber layers and the number of the axial thin bamboo strips layers is not less than 6.

As a further improvement of the invention, the fibrilia layer is formed by spirally winding and bonding the fibrilia curtain at a helical angle of 60-90 degrees.

As a further improvement of the invention, two adjacent fibrilia layers are overlapped in a staggered way.

As a further improvement of the invention, the thickness ratio of the axial thin bamboo strip layer to the fibrilia layer is 2: 1-1.5.

As a further improvement of the invention, the fibrilia curtain is formed by weaving a plurality of parallel arranged fibrilia stalks in weaving lines, and the fibrilia stalks are one or more of ramie, jute, flax, ramie, hemp and radish hemp.

As a further improvement of the invention, the same thermosetting resin is selected for the hemp winding unit and the bamboo winding unit during winding and bonding, so that the resin in the structural layer can be crosslinked and cured.

In another aspect of the invention, a method for preparing a bamboo-hemp wound composite pressure pipe is provided, which is characterized by comprising the following steps:

(1) raw material treatment: correspondingly weaving a plurality of bamboo strips placed side by side into a bamboo strip curtain, and weaving hemp stems arranged in parallel into a hemp fiber curtain;

(2) preparing an inner liner layer: coating a release layer on the surface of the die, and arranging an inner liner layer with a certain thickness on the periphery of the release layer;

(3) preparing a structural layer:

firstly, determining the number and the sequence of the hemp winding units and the bamboo winding units according to the performance requirements of the composite pressure pipe wound by bamboo and hemp, and the number of winding layers corresponding to fibrilia layers in the hemp winding units and the number of winding layers corresponding to axial bamboo skin layers in the bamboo winding units;

secondly, correspondingly winding and bonding the hemp winding units by the fibrilia curtain in the pipeline radial direction on the periphery of the inner liner layer, and correspondingly winding and bonding the bamboo winding units by the bamboo skin curtain;

(4) preparing an outer protective layer: and correspondingly arranging an outer protective layer on the periphery of the structural layer, and demolding the molded pipeline from the mold to finish the preparation of the bamboo-hemp wound composite pressure pipe.

As a further improvement of the invention, when the hemp winding unit is wound and bonded, the hemp fiber curtain is spirally wound at a helix angle of 60-90 degrees.

As a further improvement of the invention, when the hemp winding units are wound and bonded, two adjacent hemp fiber layers are overlapped in a staggered way.

As a further improvement of the invention, the hemp stalks are one or more of ramie, jute, flax, ramie, hemp and radish hemp, and after a plurality of the hemp stalks are arranged in parallel, the hemp stalks are woven into a hemp fiber curtain by weaving threads along the direction vertical to the axial direction of the hemp stalks.

The above-described improved technical features may be combined with each other as long as they do not conflict with each other.

Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

(1) the bamboo-hemp wound composite pressure pipe has the advantages that the structural layer formed by sequentially winding and bonding at least one bamboo winding unit and at least one hemp winding unit is arranged, so that the performance of a bamboo material and a hemp material is fully exerted, and the organic combination of the two materials is realized, so that the formed composite pressure pipe has good internal pressure resistance, good ring stiffness and good bending resistance, the deformation and damage of the composite pressure pipe caused by the action of internal and external pressure during use are avoided, the service life of the composite pressure pipe is prolonged, the adaptability of the composite pressure pipe is improved, the application range of the composite pressure pipe prepared by using renewable resources is expanded, the control precision required in the forming process of the composite pressure pipe is reduced, and the forming cost of the composite pressure pipe is reduced;

(2) according to the bamboo-hemp winding composite pressure pipe, the hemp fiber layers are controlled to be wound, bonded and formed at the helical angle of 60-90 degrees, and the adjacent two hemp fiber layers are in staggered joint overlapping, so that the overlapping range of the two adjacent hemp fiber layers is effectively enlarged, the hemp fiber layers can be fully overlapped during forming, the grip strength during forming of the hemp fiber layers is greatly improved, the forming of a structural layer is tighter, and the overall performance of the structural layer is greatly improved;

(3) the preparation method of the bamboo-hemp-wound composite pressure pipe has simple steps and convenient and fast control, can effectively realize the winding forming of the composite pressure pipe, obtain the bamboo-hemp-wound composite pressure pipe with excellent internal and external pressure resistance, fully exert the respective performance advantages of the bamboo material and the hemp material, and make the performance characteristics of the bamboo material and the hemp material complement and fully embody in the pipeline; meanwhile, compared with the existing forming process of the structural layer in the bamboo winding composite pipe, the integrity of the formed structural layer is stronger, the forming precision is higher, and the forming cost of the composite pressure pipe is indirectly reduced;

(4) the bamboo-hemp wound composite pressure pipe has the advantages of simple structure and convenient forming steps, can effectively realize the composite forming of bamboo materials and hemp materials, fully exerts the performance advantages of the bamboo materials and the hemp materials, ensures that the prepared composite pressure pipe has better internal pressure resistance and excellent external pressure resistance, greatly improves the ring stiffness and bending resistance of the composite pressure pipe, effectively improves the adaptability of the pipe prepared from renewable resources, enlarges the application range of the composite pressure pipe, reduces the preparation cost and the application cost of the composite pressure pipe, and has better practical value and popularization value.

Drawings

FIG. 1 is a sectional view of a bamboo-hemp wrapped composite pressure pipe in an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion I of a composite pressure pipe wound with bamboo hemp according to an embodiment of the present invention;

FIG. 3 is a schematic partial cross-sectional view of a bamboo-hemp wrapped composite pressure pipe in accordance with an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion I of a composite pressure pipe wound with bamboo hemp according to a second embodiment of the present invention;

FIG. 5 is an enlarged view of a portion I of a composite pressure pipe wound with bamboo hemp according to a third embodiment of the present invention;

FIG. 6 is an enlarged view of a portion I of a composite pressure pipe wound with bamboo hemp in accordance with a fourth embodiment of the present invention;

FIG. 7 is an enlarged view of a portion I of a composite pressure pipe wound with bamboo hemp in accordance with a fifth embodiment of the present invention;

in all the figures, the same reference numerals denote the same features, in particular: 1. the bamboo-based composite material comprises an inner liner layer, 2, a structural layer, 201, a hemp winding unit and 202, a bamboo winding unit; 3. and an outer protective layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.