WO2017133320A1 - 一种秸秆缠绕复合管及其制备方法 - Google Patents

一种秸秆缠绕复合管及其制备方法 Download PDF

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WO2017133320A1
WO2017133320A1 PCT/CN2016/109253 CN2016109253W WO2017133320A1 WO 2017133320 A1 WO2017133320 A1 WO 2017133320A1 CN 2016109253 W CN2016109253 W CN 2016109253W WO 2017133320 A1 WO2017133320 A1 WO 2017133320A1
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Prior art keywords
straw
layer
composite pipe
wound composite
stem
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PCT/CN2016/109253
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English (en)
French (fr)
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叶柃
牛琳
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浙江鑫宙竹基复合材料科技有限公司
叶柃
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Publication of WO2017133320A1 publication Critical patent/WO2017133320A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer

Definitions

  • the invention belongs to the field of composite pipelines, and more particularly to a straw-wound composite pipe and a preparation method thereof.
  • Straw is a general term for the stems and leaves of mature crops. There are a lot of idle straw resources in rural areas. Currently, they are mainly used for feed, compost, fuel, etc., which cannot be fully utilized, resulting in waste of resources and burning as a fuel. . Therefore, how to ensure the large-scale application of straw resources under the premise of ensuring environmental protection is an urgent problem to be solved by those skilled in the art.
  • CN201010277587.2 discloses a lightweight composite straw ventilation duct, comprising a substrate and a fixing strip, wherein the fixing strips are respectively disposed at an angle between two adjacent substrates, and the fixing strip is fixedly connected with the adjacent two substrates,
  • the substrate is made of composite straw lightweight partition board.
  • the present invention provides a straw-wound composite pipe and a preparation method thereof, wherein a straw-wound composite pipe is prepared by winding a straw, which breaks through the traditional application range of the straw, and passes through the straw.
  • Rational use to achieve idle resource utilization, reduce production costs and waste of resources, and through the study of composite pipe preparation methods and processes, can prepare energy-saving, environmentally friendly, low-cost straw bamboo-wound composite pipe, which can be applied to agricultural irrigation, drainage and Building ventilation and other areas where the pipeline pressure is not high.
  • a straw-wound composite pipe which, in the pipe diameter direction, includes an inner liner layer, a reinforcing layer and an outer protective layer in order from the inside to the outside, the reinforcing layer being composed of a plurality of layers
  • the straw layer is composed of a straw layer which is formed by winding a straw stem.
  • an auxiliary reinforcing layer is further disposed between any two layers of the reinforcing layer, the auxiliary reinforcing layer being a cement layer formed by mixing a resin and a filler, the filler being a natural plant filler or an inorganic mineral. filler.
  • the natural plant filler is one or more of bamboo fiber, wood fiber, hemp fiber, and plant nut fiber.
  • the inorganic mineral filler is a particulate and/or powdered stone powder and/or ore.
  • the straw is one or more of wheat straw, straw, corn stover, and sorghum straw.
  • a method of preparing the straw-wound composite pipe comprising the steps of:
  • the straw has a water content of 7% to 13% after drying.
  • the straw is laid in the same direction as the mesh cloth.
  • the straw-wound composite pipe of the present invention uses crop straw as a reinforcing layer, has wide resources, and has a short growing period.
  • the characteristics of light weight, high processing efficiency and low price make full use of idle resources, and are prepared into a composite pipe by winding method, which fully utilizes the axial tensile strength of the straw, and the processing process of the straw reinforcing layer passes along with the transfer to the mold.
  • the straw is laid, and the straws of different diameters can be directly pressed into sheets of the same thickness without being sorted by pressing, which can greatly improve the production and processing efficiency, and further reduce the production cost while satisfying the performance requirements, for agricultural irrigation and drainage.
  • FIG. 1 is a schematic structural view of a straw-sand-wound composite pipe according to an embodiment of the present invention
  • FIG. 2 is a schematic view showing the structure of a straw-sand-wound composite pipe according to an embodiment of the present invention.
  • the straw-wound composite pipe comprises, in order from the inside to the outside, an inner liner layer, a reinforcing layer and an outer protective layer, wherein the reinforcing layer is composed of a plurality of straw layers, and the straw layer is composed of Straw stems are entangled.
  • the straw has certain strength, low cost, wide source and easy availability, can fully utilize a large amount of idle resources, and the straw-wound composite pipe can be widely applied to agricultural irrigation, drainage and building ventilation, etc., which have low requirements on pipeline pressure.
  • the cost is further reduced, the utilization of idle resources is increased, and the source of raw materials is expanded.
  • the axial tensile strength of the straw can be fully utilized by the winding process.
  • an auxiliary reinforcing layer is further provided between any two layers of the reinforcing layer (ie, between any two layers of straw layers), and the auxiliary reinforcing layer is a mixture of a resin and a filler. a layer of cement, the filler being a natural plant filler or an inorganic mineral filler.
  • the natural plant filler is one or more of bamboo fiber, wood fiber, hemp fiber, and plant fruit shell fiber, and the fiber has the characteristics of high strength, and may be specifically set to a sheet shape. Or powder, mix well with the adhesive.
  • the inorganic mineral filler may be a granular or powdery inorganic mineral such as stone powder or ore.
  • the straw is one or more of wheat straw, straw, corn stover, and sorghum straw.
  • Straw pretreatment the straw is removed from the rest except the stem, and the straw stem is dried and cut to the same length;
  • Preparation of straw structure layer The mesh cloth is wound on the inner liner layer, and the straw stalk is outputted in the same direction above the grid cloth, so that the straw stem portion is closely laid on the net along with the mesh cloth to the mold.
  • the laying direction is the same as the conveying direction of the mesh cloth, or the conveying with the mesh cloth
  • the direction is at a certain angle, and then the stem of the straw is pressed into a sheet by a press machine, and then the sewing thread is sewn along the direction perpendicular to the stem of the straw by a sewing machine, and the straw stem is dipped with the mesh cloth. After the tank is dipped, it is wound on the inner liner and cured to obtain a straw reinforcing layer;
  • outer protective layer Preparation of outer protective layer: Finally, a layer of anti-corrosion and waterproof coating is sprayed on the surface of the straw reinforcing layer to form an outer protective layer.
  • the straw has a moisture content of 7% to 13% after drying.
  • the laying direction of the straw is the same as the conveying direction of the mesh cloth.
  • a straw-wound composite pipe having a nominal diameter of 200 mm is prepared as an example, and a preparation method of the straw-wound composite pipe of the present invention is specifically described. The specific steps are as follows:
  • One or more of wheat, rice, corn, and sorghum straw are selected, the straw is removed from the rest of the stem, and the straw stem is dried to obtain a straw stem having a water content of 10%, and then cut to the same length. .
  • a polished straight tube mold with an outer diameter of 200 mm is coated with a 0.04 mm thick polyester film as a release layer, which is coated with an adhesive, a wood fiber nonwoven fabric and a glass fiber knitted felt.
  • the inner liner layer 1 having a thickness of 1.5 mm is formed on the release layer of the pipe mold, the inner liner layer has a seepage prevention function, and the inner wall is smooth; the inner liner layer 1 is made of wood fiber non-woven from the inside to the outside in the radial direction of the composite pipe.
  • the adhesive includes resin
  • the curing agent the resin in this embodiment is an epoxy resin excellent in corrosion resistance.
  • One or more layers of straw stems reaching a design thickness of 12 mm; after winding, the tube is heated to 60 ° C for 180 minutes to obtain a straw reinforcing layer 2, wherein the adhesive comprises a resin and a curing agent, and the resin is specifically an amino group. Resin.
  • a layer of vinyl ester resin with good waterproof and corrosion resistance is applied on the outside of the straw reinforcing layer to obtain an outer protective layer 3, which is about 1.5 mm thick.
  • FIG. 1 The structure of the straw-wound composite pipe produced in this embodiment is shown in FIG.
  • a straw bamboo-wound composite pipe having a diameter of 400 mm is prepared as an example, and a preparation method of the straw-stub-wound composite pipe of the present invention is specifically described. The specific steps are as follows:
  • inorganic clay filler or natural plant filler Mixing resin into inorganic clay filler or natural plant filler to form clay.
  • Inorganic mineral fillers can be selected from stone powder, ore sand, etc.
  • Natural plant fillers can be selected from wood chips, wood flour, bamboo chips, bamboo powder, and plant fruit shell powder.
  • the filler mass ratio is 70%-90%, the resin mass ratio is 10%-30%; the mixed cement is evenly attached to a layer of lining, and the lining cloth with the cement is wrapped around the straw reinforced layer 2 The upper layer is compacted and compacted, and wrapped to a thickness of 6 mm to form an auxiliary reinforcing layer 4; the resin is an amino resin.
  • a layer of vinyl ester resin with good waterproof and corrosion resistance is applied on the outside of the straw structure layer to obtain an outer protective layer 3, which is about 1.5 mm thick.
  • FIG. 2 The structure of the straw bamboo composite pipe produced in this embodiment is shown in FIG. 2 .

Abstract

一种秸秆缠绕复合管及其制备方法，该复合管沿管径方向，由内至外依次包括内衬层（1）、增强层（2）和外防护层（3），所述增强层（2）是由多层秸秆茎部缠绕而成的秸秆层组成；所述方法包括以下步骤：将秸秆去掉除茎部外的其余部分，干燥后切割为相同长度；利用织物和胶黏剂制作内衬层（1）；在网格布上方输送同向的秸秆茎部，使其平行紧密铺设在网格布上，随后将铺设好的秸秆茎部压制成片状，接着对秸秆茎部进行缝制，缝制后的秸秆茎部随网格布的输送经过浸胶槽浸胶后，缠绕在内衬层（1）上，经固化获得增强层（2）；在秸秆结构层外制备外防护层（3），该方法将秸秆缠绕成复合管，可广泛应用于农业灌溉、排水及建筑通风等领域，绿色环保，质量轻，成本低，充分利用闲置资源。

Description

一种秸秆缠绕复合管及其制备方法 [技术领域]
本发明属于复合管道领域，更具体地，涉及一种秸秆缠绕复合管及其制备方法。
[背景技术]
目前在农业灌溉、排水及建筑通风等对管道承压要求不高的领域用管，普遍采用水泥管、聚氯乙烯、聚乙烯、聚丙烯、玻璃钢管、薄铁管等传统管道。水泥管成本低，但重量重，管接头易漏；聚氯乙烯、聚乙烯、聚丙烯管道质轻、光滑且耐腐蚀，但其原料均为石油化工合成制品，消耗大量宝贵的石油资源；玻璃钢管及玻璃钢夹砂管耐腐蚀、流体阻力小，但产品采用主要原料增强材料为高能耗的玻璃纤维，树脂为石油化工合成制品，产品及废料不可回收、不环保；薄钢管存在耐腐性差,生产过程能耗高、污染高、不环保等缺点。因此使用这类传统管道，消耗着大量的矿产资源、且高能耗高排放、资源不可再生。
秸秆是成熟农作物茎叶(穗)部分的总称，农村有大量闲置的秸秆资源，目前主要用于饲料、堆沤肥、燃料等，不能得到充分利用，造成资源浪费，并且作为燃料燃烧也会污染环境。因此，如何能保证环保的前提下，使秸秆资源得到大规模的应用，是本领域技术人员急需解决的问题。
CN201010277587.2公开了一种轻质复合秸秆通风管道，包括基板和固定条，所述固定条分别设置在相邻两基板的夹角处，固定条与相邻的两基板间固定连接，所述基板采用复合秸秆轻质隔墙板。上述现有技术首先采用秸秆制成复合秸秆轻质隔墙板，再拼接成方形通风管道，其工艺复杂，且方形管道的应用范围窄，不具有通用性。
[发明内容]
针对现有技术的以上缺陷或改进需求，本发明提供了一种秸秆缠绕复合管及其制备方法，其中将秸秆通过缠绕方式制备出秸秆缠绕复合管，突破秸秆传统的应用范围，通过对秸秆的合理利用，以实现闲置资源利用，减少生产成本以及资源浪费，并通过对复合管制备方法及工艺的研究，可制备节能环保、成本低廉的秸秆竹缠绕复合管，可应用于农业灌溉、排水及建筑通风等对管道承压要求不高的领域。
为实现上述目的，按照本发明的一个方面，提出了一种秸秆缠绕复合管，沿管径方向，由内至外依次包括内衬层、增强层和外防护层，所述增强层由多层秸秆层组成，该秸秆层由秸秆茎部缠绕而成。
作为进一步优选的，在所述增强层的任意两层之间还设置有辅助增强层，所述辅助增强层是由树脂和填料混合而成的胶泥层，所述填料为天然植物填料或无机矿物填料。
作为进一步优选的，所述天然植物填料为竹纤维、木纤维、麻纤维、植物果壳纤维中的一种或几种。
作为进一步优选的，所述无机矿物填料为颗粒状和/或粉状的石粉和/或矿砂。
作为进一步优选的，所述秸秆为麦秸、稻草、玉米秸秆、高粱秸秆中的一种或多种。
按照本发明的另一方面，提供了一种制备所述秸秆缠绕复合管的方法，包括以下步骤：
将秸秆去掉除茎部外的其余部分，将秸秆茎部干燥后切割为相同长度；
利用织物和胶黏剂在直管模具上制作防腐防渗的内衬层；
将网格布缠绕在内衬层上，在网格布上方输送同向的秸秆茎部，使秸秆茎部随着网格布向模具的输送平行紧密铺设在网格布上，随后将铺设好的秸秆茎部压制成片状，接着沿垂直于秸秆茎部铺设方向对秸秆茎部进行缝制，秸秆茎部随网格布的输送经过浸胶槽浸胶后，缠绕在所述内衬层上， 经固化获得增强层；
最后在所述增强层外喷涂一层防腐防水的材料，形成外防护层。
作为进一步优选的，所述秸秆茎部经干燥后的含水率为7％-13％。
作为进一步优选的，所述秸秆的铺设方向与所述网格布的输送方向相同。
总体而言，通过本发明所构思的以上技术方案与现有技术相比，主要具备以下的技术优点：本发明的秸秆缠绕复合管，采用农作物秸秆作为增强层，具有资源广泛、生长期短、质量轻、加工效率高、价格低廉等特点，充分利用了闲置资源，通过缠绕方式制备成复合管，充分利用了秸秆的轴向拉伸强度，秸秆增强层的加工过程通过随着向模具的输送，同时铺设秸秆，通过压装使不同直径的秸秆无需分拣，直接压制成相同厚度的片状，可大幅提高生产加工效率，在满足性能要求的同时，进一步降低生产成本，为农业灌溉、排水和建筑通风等领域提供了重量轻、质优价廉的管道，从原材料到生产过程都绿色环保无污染。
[附图说明]
图1是本发明一种具体实施方式的秸秆竹缠绕复合管的结构示意图；
图2是本发明一种具体实施方式的秸秆竹缠绕复合管的结构示意图。
[具体实施方式]
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
本发明一种具体实施方式中的秸秆缠绕复合管，沿管径方向，由内至外依次包括内衬层、增强层和外防护层，所述增强层由多层秸秆层组成，秸秆层由秸秆茎部缠绕而成。
本发明由于秸秆具有一定的强度，且成本低，来源广，容易获得，能够充分利用大量闲置资源，秸秆缠绕复合管可以广泛应用于农业灌溉、排水和建筑通风等对管道承压要求不高的领域，在保证产品强度的同时进一步降低成本，提高闲置资源利用率，扩大原材料来源。此外，利用缠绕工艺，可以充分发挥秸秆的轴向拉伸强度。
在上述具体实施方式的基础上，在所述增强层的任意两层之间(即任意两层秸秆层之间)还设置有辅助增强层，所述辅助增强层是由树脂和填料混合而成的胶泥层，所述填料为天然植物填料或无机矿物填料。通过设置由天然植物填料或无机矿物填料制成的辅助增强层，可以进一步增大管体的强度和刚度，并且绿色环保，其可以设置一层或多层。
在上述具体实施方式的基础上，所述天然植物填料为竹纤维、木纤维、麻纤维、植物果壳纤维中的一种或几种，上述纤维具有强度高的特点，具体可以设置为片状或粉状，与胶黏剂混合搅拌均匀。
在上述具体实施方式的基础上，无机矿物填料可以采用石粉、矿砂等颗粒状或粉状无机矿物质。
在上述具体实施方式的基础上，所述秸秆为麦秸、稻草、玉米秸秆、高粱秸秆中的一种或多种。
本发明的一种具体实施方式中的制备上述秸秆缠绕复合管的方法，包括以下步骤：
秸秆预处理：将秸秆去掉除茎部外的其余部分，将秸秆茎部干燥后切割为相同长度；
内衬层的制备：利用织物和胶黏剂在直管模具上制作防腐防渗的内衬层；
秸秆结构层的制备：将网格布缠绕在内衬层上，在网格布上方设置料斗输出同向的秸秆茎部，使秸秆茎部随着网格布向模具的输送平行紧密铺设在网格布上，其铺设方向与网格布的输送方向相同，或与网格布的输送 方向成一定的角度，随后通过压装机将铺设好的秸秆茎部压制成片状，接着通过缝纫机沿垂直于秸秆茎部铺设方向缝制缝纫线，秸秆茎部随网格布的输送经过浸胶槽浸胶后，缠绕在所述内衬层上，经固化获得秸秆增强层；
外防护层的制备：最后在秸秆增强层表面喷涂一层防腐防水的涂料，形成外防护层。
在上述具体实施方式的基础上，所述秸秆茎部经干燥后的含水率为7％-13％。
在上述具体实施方式的基础上，所述秸秆的铺设方向与所述网格布的输送方向相同。
以下为本发明的具体实施例：
实施例1
本实施例以制作公称直径为200mm的秸秆缠绕复合管为例，具体说明本发明的秸秆缠绕复合管的制备方法，其具体步骤如下：
1)秸秆预处理：
选取小麦、水稻、玉米、高粱秸秆中的一种或几种，将秸秆去掉除茎部外的其余部分，将秸秆茎部干燥，获得含水率为10％的秸秆茎部，之后切割为相同长度。
2)内衬层的制备：
在外径为200mm的经抛光的直管模具上包覆一层0.04mm厚的聚酯薄膜，该聚脂薄膜作为脱模层，用胶黏剂、木纤维无纺布及玻璃纤维针织毡在直管模具的脱模层上制作厚度达1.5mm的内衬层1，该内衬层具有防渗功能，且内壁光滑；内衬层1沿复合管径向由内至外依次为木纤维无纺布及玻璃纤维针织毡，木纤维无纺布作为天然纤维织物层，玻璃纤维针织毡作为增强织物层，木纤维无纺布及玻璃纤维针织毡均浸有胶黏剂，该胶黏剂包括树脂和固化剂，本实施例中树脂选用防腐性能优异的环氧树脂。
3)秸秆增强层的制备：
将网格布缠绕在内衬层上，在网格布上方设置料斗输出同向的秸秆茎部，使秸秆茎部随着网格布向模具的输送平行紧密铺设在网格布上，秸秆的铺设方向与所述网格布的输送方向相同。随后通过压装机将铺设好的秸秆茎部压制成片状，接着通过缝纫机沿垂直于秸秆茎部铺设方向缝制缝纫线，秸秆茎部随网格布的输送经过浸胶槽浸胶后，缠绕一层或一层以上秸秆茎部，达到设计厚度12mm；缠绕完毕后，对管道加热到60℃固化180分钟，获得秸秆增强层2，其中，胶黏剂包括树脂和固化剂，树脂具体为氨基树脂。
4)外防护层的制备：
在秸秆增强层外面涂刷一层防水防腐较好的乙烯基酯树脂以获得外防护层3，厚约1.5mm。
本实施例生产的秸秆缠绕复合管的结构如图1所示。
实施例2
本实施例以制作直径为公称直径400mm的秸秆竹缠绕复合管为例，具体说明本发明的秸秆竹缠绕复合管的制备方法，其具体步骤如下：
1)秸秆预处理：同实施例1；
2)内衬层的制备：同实施例1，只是直管模具的外径为400mm；
3)第一秸秆增强层21的制备：同实施例1，厚度为6mm；
4)辅助增强层的制备：
用树脂和无机矿物填料或天然植物填料混合搅拌成胶泥，无机矿物填料可以选用石粉、矿砂等，天然植物填料可以选用木片、木粉、竹片、竹粉、植物果壳粉中的一种或几种，填料质量比为70％-90％，树脂质量比为10％-30％；将混合好的胶泥均匀的附着在一层衬布上，将附着有该胶泥的衬布包裹在秸秆增强层2上并拉紧压实，包裹至6mm的厚度，制成辅助增强层4；树脂选用氨基树脂。
5)第二秸秆增强层22的制备：在辅助增强层4外继续缠绕秸秆茎部， 直至厚度达到6mm；
6)外防护层的制备：同实施例1；
在秸秆结构层外面涂刷一层防水防腐较好的乙烯基酯树脂以获得外防护层3，厚约1.5mm。
本实施例生产的秸秆竹复合管的结构如图2所示。
本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (8)

  1. 一种秸秆缠绕复合管，沿管径方向，由内至外依次包括内衬层、增强层和外防护层，其特征在于，所述增强层由多层秸秆层组成，该秸秆层由秸秆茎部缠绕而成。
  2. 如权利要求1所述的秸秆缠绕复合管，其特征在于，在任意两层秸秆层之间还设置有辅助增强层，所述辅助增强层是由树脂和填料混合而成的胶泥层，所述填料为天然植物填料或无机矿物填料。
  3. 如权利要求2所述的秸秆缠绕复合管，其特征在于，所述天然植物填料为竹纤维、木纤维、麻纤维、植物果壳纤维中的一种或几种。
  4. 如权利要求2所述的秸秆缠绕复合管，其特征在于，所述无机矿物填料为颗粒状和/或粉状的石粉和/或矿砂。
  5. 如权利要求3所述的秸秆缠绕复合管，其特征在于，所述秸秆为麦秸、稻草、玉米秸秆、高粱秸秆中的一种或多种。
  6. 一种秸秆缠绕复合管的制备方法，其特征在于，包括以下步骤：
    将秸秆去掉除茎部外的其余部分，将秸秆茎部干燥后切割为相同长度；
    利用织物和胶黏剂在直管模具上制作防腐防渗的内衬层；
    将网格布缠绕在内衬层上，在网格布上方输送同向的秸秆茎部，使秸秆茎部随着网格布向模具的输送平行紧密铺设在网格布上，随后将铺设好的秸秆茎部压制成片状，接着沿垂直于秸秆茎部铺设方向对秸秆茎部进行缝制，缝制后的秸秆茎部随网格布的输送经过浸胶槽浸胶后，缠绕在所述内衬层上，经固化获得增强层；
    最后在所述增强层外喷涂一层防腐防水的涂料，形成外防护层。
  7. 如权利要求6所述的秸秆缠绕复合管的制备方法，其特征在于，所述秸秆茎部经干燥后的含水率为7％-13％。
  8. 如权利要求7所述的秸秆缠绕复合管的制备方法，其特征在于，所 述秸秆的铺设方向与所述网格布的输送方向相同。
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