WO2017097250A1 - 一种竹缠绕复合管的内衬层及其制备方法 - Google Patents

一种竹缠绕复合管的内衬层及其制备方法 Download PDF

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WO2017097250A1
WO2017097250A1 PCT/CN2016/109166 CN2016109166W WO2017097250A1 WO 2017097250 A1 WO2017097250 A1 WO 2017097250A1 CN 2016109166 W CN2016109166 W CN 2016109166W WO 2017097250 A1 WO2017097250 A1 WO 2017097250A1
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layer
fabric
bamboo
natural fiber
inner liner
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PCT/CN2016/109166
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English (en)
French (fr)
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叶柃
朱鑫
翁赟
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 WO2017097250A1 publication Critical patent/WO2017097250A1/zh

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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
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • 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
    • 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

Definitions

  • the invention belongs to the field of preparation of pressure pipe inner liner, and more particularly to an inner liner of a bamboo wound composite pipe and a preparation method thereof.
  • the pipelines used are generally steel pipes, ductile iron pipes, polyethylene pipes, polyvinyl chloride pipes, cement pipes, steel-lined cement pipes, and glass steel. Pipe, glass fiber reinforced plastic sand pipe, etc.
  • the production process of raw materials for steel pipes and ductile iron pipes will discharge a large amount of waste gas, waste water and waste slag, causing serious environmental pollution, and the weight of the pipe body is large, the transportation cost is high, and the construction is difficult;
  • the polyethylene pipe and the polyvinyl chloride pipe raw material They are synthetic products of petroleum products, which consume petroleum resources; cement pipes and steel-lined cement pipes are easy to leak, causing environmental pollution, heavy weight, high transportation cost, and difficult construction; glass steel pipes and glass fiber reinforced plastic sand pipes are made of high energy consumption. Made of fiberglass, it consumes oil resources, and the products and wastes are not recyclable and environmentally friendly. Therefore, the pipelines currently used generally have the disadvantage of consuming petroleum resources and being environmentally friendly.
  • CN200920121209.8 discloses a bamboo fiber wound composite pipe, which is an inner liner from the inside to the outside in the pipe diameter direction. a reinforcing layer and an outer protective layer, wherein the reinforcing layer is a bamboo fiber layer in which a continuous bamboo fiber ribbon is wound on the inner liner;
  • CN201320697993.3 discloses a thermosetting bamboo sand composite pressure pipe, the pressure tube is radial
  • An inner liner layer, an inner reinforcement layer, a sand rubber layer, an outer reinforcement layer and an outer protective layer are respectively disposed from the inside to the outside, and the inner liner layer and the outer protective layer are arranged in a row from the inside to the outside.
  • the inner reinforcement layer, the thickened layer of the mineral sand glue and the outer reinforcement layer of the bamboo raft meets the advanced concepts of energy saving, environmental protection and resource renewable, and the price is lower than other traditional
  • the prior art disclosed in the prior art does not mention the specific structure of the inner layer of the bamboo-wound composite pipe and the preparation method thereof, and the inner liner layer is particularly important as the inner layer in the bamboo-wound composite pipe which is in direct contact with the conveying medium. It is necessary to ensure leakage prevention, corrosion prevention, and hygiene requirements. Therefore, it is necessary to study and design an inner liner that satisfies the requirements of the bamboo-wound composite pipe.
  • the present invention provides an inner liner layer, wherein the characteristics of the bamboo-wound composite pipe itself and the characteristics of the preparation process thereof are combined, and the inner liner layer of the bamboo-wound composite pipe is designed correspondingly.
  • the specific structure of the inner liner and the specific preparation method and process of the research and design obtain the inner liner suitable for the bamboo-wound composite pipe to meet the requirements of anti-leakage, anti-corrosion and sanitation, so that the bamboo liner with the inner liner
  • the composite pipe is suitable for various occasions such as agricultural irrigation, water supply and drainage engineering and petrochemical anti-corrosion.
  • an inner liner layer of a bamboo-wound composite pipe is provided, which is arranged along the radial direction of the bamboo-wound composite pipe, including a natural fiber fabric layer and reinforcement from the inside to the outside.
  • a fabric layer, the natural fiber fabric of the natural fiber fabric layer and the reinforcing fabric of the reinforced fabric layer are all impregnated with an adhesive, the natural fiber fabric dipping ratio is greater than 92%, and the reinforcing fabric dipping rate is greater than 71 %
  • the adhesive includes at least a resin and a curing agent.
  • the inner liner layer is radially wound along the bamboo-wound composite pipe, and has a mesh cloth layer from the inner surface to the outer surface of the outer reinforcing fabric layer.
  • the natural fiber fabric has a longitudinal tensile strength of not less than 15 N/5 cm and a transverse tensile strength of not less than 7 N/5 cm.
  • the natural fiber fabric is a bamboo fiber nonwoven fabric or a wood fiber nonwoven fabric.
  • the bamboo fiber nonwoven fabric or the wood fiber nonwoven fabric has a mass per unit area of 35 g/m 2 to 40 g/m 2 .
  • the reinforcing fabric has a longitudinal tensile strength of not less than 150 N/5 cm and a transverse tensile strength of not less than 60 N/5 cm.
  • the reinforcing fabric is a fiberglass knitted felt.
  • the resin is one of an epoxy resin, a vinyl ester resin, and an unsaturated polyester resin.
  • the inner liner has a thickness ranging from 1.2 mm to 1.8 mm.
  • a method for preparing an inner liner of a bamboo-wound composite pipe comprising the steps of:
  • a layer of adhesive is sprayed on the surface of the natural fiber fabric layer, and the reinforced fabric is wound at the same time, and the surface of the reinforced fabric is rolled with a roller brush to infiltrate the reinforced fabric with the adhesive. And exhaust the bubbles to obtain a reinforced fabric layer;
  • the inner liner layer of a bamboo-wound composite pipe designed by the invention comprises a natural fiber fabric layer and a reinforced fabric layer in order from the inside to the outside, and the natural fiber fabric layer and the reinforced fabric layer are all impregnated with adhesive.
  • the agent acts as an anti-corrosion and anti-leakage effect by using a natural fiber fabric layer as the inner surface of the inner liner.
  • the pipeline When the pipeline is used for transporting drinking water, it is environmentally friendly, harmless to the human body, can meet the sanitary requirements, and the natural fiber fabric
  • the horizontal and longitudinal tensile strength of the layer such as bamboo fiber non-woven fabric or wood fiber non-woven fabric is high, so that the bamboo fiber non-woven fabric or the wood fiber non-woven fabric layer can realize mechanical winding and improve production efficiency;
  • the layer can effectively enhance the strength of the inner liner and improve the anti-leakage performance of the inner liner; through repeated tests, the natural fiber fabric should satisfy the dipping rate of more than 92%.
  • the reinforced fabric should meet the requirements of the dipping rate of more than 71% in order to meet the sealing requirements of the inner layer of the bamboo-wound composite pipe.
  • a mesh cloth layer may be disposed outside the reinforced fabric layer to tighten the natural fiber fabric layer and the reinforced fabric layer, thereby escaping bubbles in the adhesive, and further improving the strength and quality of the inner liner layer.
  • the present invention also studies and sets parameters such as tensile strength and unit area quality of the natural fiber fabric layer and the reinforcing fabric layer in the inner liner layer, and the longitudinal tensile strength of the natural fiber fabric is not less than 15 N/5 cm, and the transverse direction.
  • the tensile strength is not less than 7N/5cm, which satisfies the requirements of mechanical winding.
  • the longitudinal tensile strength of the reinforced fabric is not less than 150N/5cm, and the transverse tensile strength is not less than 60N/5cm, which satisfies the strength required for the inner liner to prevent seepage.
  • the inner liner suitable for bamboo-wound composite pipe which meets the requirements of anti-leakage, anti-corrosion and sanitation can be prepared by the method of the invention, and the bamboo-wound composite pipe with the inner liner can be applied to agricultural irrigation, water supply and drainage engineering And petrochemical anti-corrosion and other occasions.
  • Figure 1 is a schematic view of an inner liner of the present invention
  • FIG. 2 is a flow chart of a method of preparing an inner liner of the present invention.
  • an inner liner layer of a bamboo-wound composite pipe of the present invention has an inner liner layer along the radial direction of the pipe, and a natural fiber fabric layer 1 and a reinforced fabric layer 2 in order from the inside to the outside, the natural fiber.
  • Both the natural fiber fabric of the fabric layer and the reinforced fabric of the reinforced fabric layer are impregnated with an adhesive, the adhesive comprising at least a resin and a curing agent, and an accelerator or other auxiliary agent may be added as the case may be.
  • the present invention selects a natural fiber fabric as the innermost layer of the inner liner layer, and the inner liner layer can satisfy the required sanitary condition
  • the natural fiber fabric can be a plant fiber fabric, an animal fiber fabric or a mineral fiber fabric, and the like.
  • it may be a hemp fiber non-woven fabric, a wood fiber non-woven fabric, a bamboo fiber non-woven fabric, a silk fiber non-woven fabric, a carbon fiber non-woven fabric, etc., while satisfying sanitary conditions, and also satisfying mechanical winding requirements;
  • the fiber fabric dipping rate is greater than 92%, and the reinforcing fabric dipping rate is greater than 71%.
  • the sealing property of the adhesive is the main condition for ensuring anticorrosion and anti-seepage, and the natural condition is adopted.
  • the dipping rate of the fiber fabric is controlled within a range of more than 92%, and the immersion rate of the reinforced fabric is controlled to be greater than 71%, which can ensure the anticorrosion and anti-seepage performance of the inner lining layer; in order to meet the mechanical requirements and strength requirements of the entanglement,
  • the natural fiber fabric has a longitudinal tensile strength of not less than 15 N/5 cm and a transverse tensile strength of not less than 7 N/5 cm, and the preferred natural fiber fabric satisfying the above conditions is bamboo fiber.
  • the reinforced fabric has a longitudinal tensile strength of not less than 150 N/5 cm and a transverse tensile strength of not less than 60 N/5 cm, and the reinforced fabric may be any one that meets the above tensile strength requirements and dipping rate.
  • the fabric with increased strength is preferably a high strength glass fiber knitted felt.
  • the resin in the adhesive is one of an epoxy resin, a vinyl ester resin, and an unsaturated polyester resin, and all three adhesives have good corrosion resistance;
  • the mass per unit area thereof is preferably 35 g/m 2 to 40 g/m 2 , and it is found from the test data that bamboo fibers of 35 g/m 2 to 40 g/m 2 are not used.
  • the woven fabric not only meets the tensile requirements, but also ensures that the immersion rate is above 95%. When the bamboo fiber nonwoven fabric with a mass per unit area of more than 40g/m 2 is selected, the immersion rate is low, and delamination causes delamination and entanglement.
  • the inner lining layer has poor performance;
  • the reinforced fabric is preferably a high-strength glass fiber knitted felt, the reinforced fabric is used to increase the strength of the inner lining layer to ensure leakage prevention, and the glass fiber knitted felt protects the natural fiber fabric layer. It can play a certain resistance to seepage;
  • the thickness of the inner liner is preferably 1.2mm ⁇ 1.8mm, which reduces the amount of material used and saves cost under the premise of ensuring anti-seepage and anti-corrosion.
  • the moisture content of the glass fiber knitted felt should be no more than 0.5%, and the moisture content of the bamboo fiber nonwoven fabric or the wood fiber nonwoven fabric should be no more than 11%.
  • a method for preparing an inner liner layer of a bamboo-wound composite pipe of the present invention comprises the following steps:
  • a layer of adhesive is sprayed on the surface of the natural fiber fabric layer 1 while winding the reinforced fabric, and the surface of the reinforced fabric is rolled with a roller brush to infiltrate the adhesive. Fabric and exhausted air bubbles to obtain a reinforced fabric layer 2;
  • a release layer a tube mold for preparing an inner liner is rotated at a constant speed, and a polyester film is uniformly entangled from one end to the other end of the tube mold to obtain a polyester film layer, the polyester film The layer is a release layer for demolding, and the polyester film is wrapped to ensure that the polyester film is not wrinkled;
  • bamboo fiber non-woven fabric (or wood fiber non-woven fabric) as the inner surface, its longitudinal tensile strength is greater than 15N/5cm, transverse tensile strength is greater than 7N / 5cm, can meet the requirements of mechanical winding, therefore, the bamboo fiber non-woven fabric (or wood fiber non-woven fabric) with high tensile strength can be used as the inner surface material to achieve mechanical winding and improve production efficiency;
  • the inner liner has no strength, the water can easily leak into the reinforcing layer of the bamboo-wound composite pipe, and the inner liner can not prevent leakage and protect the bamboo reinforcing layer;
  • the mesh cloth can be wound on the surface of the glass fiber knitted felt layer 2, and simultaneously rolled with a wool roller to tighten the knitted felt to further exhaust the bubbles in the resin;
  • Curing treatment the speed of the tube mold is adjusted to zero. After stopping the rotation, the tube mold and the prepared inner liner are hoisted to the curing machine for curing. When necessary, the baking lamp can be turned on for heating and curing, and the desired after curing is obtained. In the inner lining layer, during the hoisting process, the mold should be ensured that the mold is smoothly dropped or hoisted to prevent the mold from colliding with the equipment during the hoisting process.
  • the polyester film has a lap width of 1 cm to 2 cm, and the polyester film needs no damage, no wrinkles, and both sides are smooth and clean;
  • the lap width of the natural fiber fabric is 10 mm to 20 mm, and the broken end and the edge are damaged. It should be replenished in time;
  • the lap width of the glass fiber knitted felt is 10mm ⁇ 20mm, the number of lap joints of the glass fiber knitted felt is no more than three layers, the shearing place should be flattened and pressed;
  • the mesh cloth lap width is 10mm ⁇ 20mm.

Abstract

一种竹缠绕复合管的内衬层及其制备方法，该内衬层沿着管道的径向，由内至外依次包括天然纤维织物层（1）和增强织物层（2），天然纤维织物层（1）的天然纤维织物和增强织物层（2）的增强织物均浸有胶黏剂，天然纤维织物浸胶率大于92％，增强织物浸胶率大于71％，胶黏剂包括树脂和固化剂。该方法包括如下步骤：首先制备脱模层；在脱模层表面淋一层胶黏剂，接着缠绕天然纤维织物，使胶黏剂浸润天然纤维织物，以获得天然纤维织物层（1）；在天然纤维织物层（1）表面淋一层胶黏剂，缠绕增强织物，使胶黏剂浸润增强织物，以获得增强织物层（2）；然后进行固化处理获得所需的内衬层。该内衬层具有良好的防渗漏性和防腐蚀性，满足卫生要求，制备方法操作简单，效率高。

Description

一种竹缠绕复合管的内衬层及其制备方法 【技术领域】
本发明属于压力管道内衬层制备领域，更具体地，涉及一种竹缠绕复合管的内衬层及其制备方法。
【背景技术】
目前在城市给排水、水利、农田灌溉、石油污水处理、工业循环水等领域，所用的管道普遍为钢管、球墨铸铁管、聚乙烯管、聚氯乙烯管、水泥管、钢衬水泥管、玻璃钢管、玻璃钢夹砂管等。其中，钢管和球墨铸铁管的原料的生产过程会排放大量的废气、废水、废渣，造成严重的环境污染，并且管体重量大，运输成本高，施工困难；聚乙烯管和聚氯乙烯管原料均为石油产品的合成品，消耗石油资源；水泥管和钢衬水泥管易渗漏，造成环境污染，且重量大，运输成本高，施工困难；玻璃钢管和玻璃钢夹砂管是由具有高能耗的玻璃纤维制成，消耗石油资源，且产品及废料不可回收、不环保。因此，目前所用的管道普遍具有消耗石油资源、不环保的缺点。
为克服上述问题，现有技术中研究获得了一种新型复合管道，例如，CN200920121209.8公开了一种竹纤维缠绕复合管，该复合管沿管径方向，由内到外依次为内衬层、增强层、外防护层，所述增强层为连续的竹纤维带缠绕在内衬层上的竹纤维层；CN201320697993.3公开了一种热固型竹砂复合压力管，该压力管径向由内至外分别设置有内衬层、内增强层、砂胶层、外增强层和外防护层，所述内衬层和外防护层之间由内至外依次设置有竹篾缠绕而成的内增强层、矿砂胶水搅拌而成的增厚层和竹篾缠绕而成的外增强层。上述竹复合管符合节能环保、资源可再生等先进理念，且价格低于其它传统管道。
然而，上述公开的现有技术中均未提到竹缠绕复合管内衬层的具体结构及其制备方法，而内衬层作为竹缠绕复合管中与输送介质直接接触的内层，尤为重要，需保证防渗漏、防腐蚀，且需满足卫生要求。因此，需研究设计一种满足竹缠绕复合管需求的内衬层。
【发明内容】
针对现有技术的以上缺陷或改进需求，本发明提供了一种内衬层，其中结合竹缠绕复合管自身的特征及其制备工艺特点，相应设计了竹缠绕复合管的内衬层，通过对内衬层的具体结构及其具体制备方法及工艺的研究和设计，获得满足防渗漏、防腐蚀及卫生要求的适用于竹缠绕复合管的内衬层，使得具备该内衬层的竹缠绕复合管适用于农业灌溉、给排水工程及石油化工防腐等多种场合。
为实现上述目的，按照本发明的一个方面，提出了一种竹缠绕复合管的内衬层，该内衬层沿着竹缠绕复合管径向，由内至外依次包括天然纤维织物层和增强织物层，所述天然纤维织物层的天然纤维织物和所述增强织物层的增强织物均浸有胶黏剂，所述天然纤维织物浸胶率大于92％，所述增强织物浸胶率大于71％，所述胶黏剂至少包括树脂和固化剂。
进一步优选的，该内衬层沿着该竹缠绕复合管径向，由内至外在增强织物层的外表面还具有网格布层。
进一步优选的，所述天然纤维织物纵向拉伸强度不小于15N/5cm，横向拉伸强度不小于7N/5cm。
进一步优选的，所述天然纤维织物为竹纤维无纺布或木纤维无纺布。
进一步优选的，所述竹纤维无纺布或木纤维无纺布的单位面积质量为35g/m2～40g/m2。
进一步优选的，所述增强织物纵向拉伸强度不小于150N/5cm，横向拉伸强度不小于60N/5cm。
进一步优选的，所述增强织物为玻璃纤维针织毡。
进一步优选的，所述树脂为环氧树脂、乙烯基酯树脂、不饱和聚酯树脂中的一种。
进一步优选的，所述内衬层的厚度范围为1.2mm～1.8mm。
按照本发明的另一个方面，提供了一种竹缠绕复合管的内衬层的制备方法，包括如下步骤：
(1)制备脱模层：在管模具上缠绕聚酯薄膜以获得脱模层；
(2)配制胶黏剂：向树脂中添加一定比例的固化剂，搅拌混合均匀，以获得胶黏剂；
(3)制备天然纤维织物层：在所述脱模层的表面淋一层胶黏剂，同时缠绕天然纤维织物，使该胶黏剂浸润该天然纤维织物，以获得天然纤维织物层；
(4)制备增强织物层：在所述天然纤维织物层的表面淋一层胶黏剂，同时缠绕增强织物，用滚刷在所述增强织物表面滚压，使该胶黏剂浸润该增强织物并赶尽气泡，以获得增强织物层；
(5)固化处理：将所述管模具连同制备好的内衬层进行固化处理，固化完成后获得所需的内衬层。
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：
1.本发明设计的一种竹缠绕复合管的内衬层，该内衬层由内至外依次包括天然纤维织物层和增强织物层，并且天然纤维织物层和增强织物层均浸有胶黏剂，起到防腐防渗漏作用，通过采用天然纤维织物层作为内衬层的内表面，当管道用于输送饮用水时，绿色环保，对人体无害，能够满足卫生要求，且天然纤维织物层如竹纤维无纺布或木纤维无纺布的横向、纵向拉伸强度高，由此使得竹纤维无纺布或木纤维无纺布层可实现机械缠绕，提高生产效率；通过设置增强织物层可有效增强内衬层的强度，提高内衬层的防渗漏性能；通过多次试验得出，天然纤维织物应满足浸胶率大于92％， 增强织物应满足浸胶率大于71％的要求，才能符合竹缠绕复合管内衬层的密封要求，如果浸胶率低于上述值，制出的内衬层内部层与层之间粘合性差，防渗防腐性能大大降低。此外，也可在增强织物层外设置网格布层，以勒紧天然纤维织物层和增强织物层，进而赶出胶黏剂中的气泡，进一步提高内衬层的强度与质量。
2.本发明还对内衬层中的天然纤维织物层和增强织物层的拉伸强度以及单位面积质量等参数进行了研究和设定，天然纤维织物纵向拉伸强度不小于15N/5cm，横向拉伸强度不小于7N/5cm，使其满足机械缠绕要求，增强织物纵向拉伸强度不小于150N/5cm，横向拉伸强度不小于60N/5cm，使其满足内衬层防渗所需的强度要求及缠绕工艺要求，经过不断地试验，发现选用单位面积质量为35g/m2～40g/m2的竹纤维无纺布或木纤维无纺布可以使浸胶率达到95％以上的同时，拉伸强度优异，符合机械缠绕要求，并且绿色环保，满足卫生要求；此外，本发明还对竹缠绕复合管的内衬层的制备方法进行了研究，该方法制备工艺简单，操作方便，缠绕出的内衬层结合紧密，密封性好。通过本发明的方法可制备出满足防渗漏、防腐蚀及卫生要求的适用于竹缠绕复合管的内衬层，并且具备该内衬层的竹缠绕复合管可适用于农业灌溉、给排水工程及石油化工防腐等多种场合。
【附图说明】
图1是本发明的内衬层示意图；
图2是本发明的内衬层制备方法的流程图。
【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。
如图1所示，本发明的一种竹缠绕复合管的内衬层，内衬层沿着管道径向，由内至外依次为天然纤维织物层1和增强织物层2，所述天然纤维织物层的天然纤维织物和所述增强织物层的增强织物均浸有胶黏剂，所述胶黏剂至少包括树脂和固化剂，还可以根据具体情况加入促进剂或其他助剂。
具体的，本发明选用天然纤维织物作为内衬层的最内层，可使得内衬层满足所需的卫生条件，所述天然纤维织物可以为植物纤维织物、动物纤维织物或矿物纤维织物等，具体可以为麻纤维无纺布、木纤维无纺布、竹纤维无纺布、蚕丝纤维无纺布、碳纤维无纺布等，在满足卫生条件的同时，还可满足机械缠绕要求；所述天然纤维织物浸胶率大于92％，所述增强织物浸胶率大于71％，由于内衬层主要作用是防腐和防渗，胶黏剂的密封性是保证防腐防渗的主要条件，通过将天然纤维织物浸胶率控制在大于92％的范围内，增强织物浸胶率控制在大于71％的范围内，可保证内衬层的防腐、防渗性能；为了满足缠绕的机械要求以及强度要求，所述天然纤维织物纵向拉伸强度需不小于15N/5cm，横向拉伸强度需不小于7N/5cm，满足上述条件的优选的天然纤维织物为竹纤维无纺布或木纤维无纺布；所述增强织物纵向拉伸强度不小于150N/5cm，横向拉伸强度不小于60N/5cm，增强织物可以为任意符合上述拉伸强度要求和浸胶率的用以增加强度的织物，优选为强度高的玻璃纤维针织毡。
此外，所述胶黏剂中的树脂为环氧树脂、乙烯基酯树脂、不饱和聚酯树脂中的一种，这三种胶黏剂均具有良好的耐腐蚀性；当所述天然纤维织物为竹纤维无纺布或木纤维无纺布时，其单位面积质量优选为35g/m2～40g/m2，经过试验数据得出，选用35g/m2～40g/m2的竹纤维无纺布既满足拉力要求，又能保证浸胶率在95％以上，当选用单位面积质量超过40g/m2的竹纤维无纺布时，浸胶率低，缠绕时会导致分层，缠绕出的内衬层性能差；所述增强织物优选为强度高的玻璃纤维针织毡，采用增强织物以增大内衬层的强度保证防渗漏，有玻璃纤维针织毡对天然纤维织物层的保护，能起 到一定的抵抗防渗作用；内衬层的厚度优选为1.2mm～1.8mm，在保证防渗防腐的前提下，减少材料使用量，节约成本。为保证内衬层的制作质量，玻璃纤维针织毡的含水率应不大于0.5％，竹纤维无纺布或木纤维无纺布的含水率应不大于11％。
如图2所示，本发明的一种竹缠绕复合管的内衬层的制备方法，其包括如下步骤：
(1)制备脱模层：在管模具上缠绕聚酯薄膜以获得脱模层；
(2)配制胶黏剂：向树脂中添加一定比例的固化剂，搅拌混合均匀，以获得胶黏剂；
(3)制备天然纤维织物层：在所述脱模层的表面淋一层胶黏剂，同时缠绕天然纤维织物，使该胶黏剂浸润该天然纤维织物，以获得天然纤维织物层1；
(4)制备增强织物层：在所述天然纤维织物层1的表面淋一层胶黏剂，同时缠绕增强织物，用滚刷在所述增强织物表面滚压，使该胶黏剂浸润该增强织物并赶尽气泡，以获得增强织物层2；
(5)固化处理：将所述管模具连同制备好的内衬层进行固化处理，固化完成后获得所需的内衬层。
下面将详细说明本发明的竹缠绕复合管的内衬层的制备方法，该方法具体包括如下步骤：
(1)制备脱模层：匀速转动用于制备内衬层的管模具，将聚酯薄膜在管模具的表面从其一端向另一端均匀缠制一遍以获得聚酯薄膜层，该聚酯薄膜层为用以脱模的脱模层，缠制时需保证聚酯薄膜缠平不能有褶皱；
(2)配制胶黏剂：向树脂中添加一定比例的固化剂，根据树脂种类、环境温度和湿度、制品制作时间，确定固化剂比例；搅拌混合均匀，以获得胶黏剂；
(3)制备天然纤维织物层：保持管模具匀速转动，用淋胶装置在聚酯 薄膜层的表面均匀的淋一层胶黏剂如环氧树脂、乙烯基酯树脂或不饱和聚酯树脂，缠绕竹纤维无纺布(或木纤维无纺布)，以获得竹纤维无纺布(或木纤维无纺布)层，保证树脂足够多，以使竹纤维无纺布(或木纤维无纺布)完全浸润(浸胶率大于92％)；树脂中需添加固化剂及促进剂适量，防止固化太快来不及操作，固化太慢影响效率；采用竹纤维无纺布(或木纤维无纺布)作为内表面，其纵向拉伸强度大于15N/5cm，横向拉伸强度大于7N/5cm，均能满足机械缠绕的要求，因此，采用抗拉强度较高的竹纤维无纺布(或木纤维无纺布)作为内表面材料，可实现机械缠绕，提高生产效率；
(4)制备增强织物层：天然纤维织物层缠好后，在竹纤维无纺布(或木纤维无纺布)层的表面淋一层树脂，然后缠绕玻璃纤维针织毡以获得玻璃纤维针织毡层，同时用羊毛辊在玻璃纤维针织毡的表面滚压，以赶尽气泡，玻璃纤维针织毡局部没有浸透的区域，需补淋树脂并滚压至浸透；增强织物层是内衬层中起强度增强作用的最主要部分，如果内衬层没有强度，水很容易渗漏入竹缠绕复合管的增强层中，内衬层就起不到防渗漏、保护竹增强层的作用；针织毡缠好后，可以将网格布缠绕在玻璃纤维针织毡层2的表面，同时用羊毛辊滚压，用以勒紧针织毡，进一步赶尽树脂中的气泡；
(5)固化处理：管模具转速调为零，停止转动后，将管模具连同制备好的内衬层吊装至固化机上进行固化，需要时可开启烤灯进行加热固化，固化后获得所需的内衬层，模具在吊装过程中，应保证模具平稳落下或吊起，防止模具在吊装过程中与设备发生碰撞。
具体而言，聚酯薄膜的搭接宽度为1cm～2cm，聚酯薄膜需无破损，无皱折，两面光滑洁净；天然纤维织物的搭接宽度为10mm～20mm，断头及边缘有破损时要及时补上；玻璃纤维针织毡的搭接宽度为10mm～20mm，玻璃纤维针织毡的搭接层数不超过三层，剪断处要摊平、压住；网格布搭接宽度为10mm～20mm。
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 (10)

  1. 一种竹缠绕复合管的内衬层，其特征在于，该内衬层沿着竹缠绕复合管径向，由内至外依次包括天然纤维织物层(1)和增强织物层(2)，所述天然纤维织物层的天然纤维织物和所述增强织物层的增强织物均浸有胶黏剂，所述天然纤维织物浸胶率大于92％，所述增强织物浸胶率大于71％，所述胶黏剂包括树脂和固化剂。
  2. 如权利要求1所述的竹缠绕复合管的内衬层，其特征在于，所述内衬层沿着该竹缠绕复合管径向，由内至外在增强织物层(2)的外表面还具有网格布层。
  3. 如权利要求1所述的竹缠绕复合管的内衬层，其特征在于，所述天然纤维织物为竹纤维无纺布或木纤维无纺布。
  4. 如权利要求1所述的竹缠绕复合管的内衬层，其特征在于，所述天然纤维织物纵向拉伸强度不小于15N/5cm，横向拉伸强度不小于7N/5cm。
  5. 如权利要求4所述的竹缠绕复合管的内衬层，其特征在于，所述竹纤维无纺布或木纤维无纺布的单位面积质量为35g/m2～40g/m2。
  6. 如权利要求1所述的竹缠绕复合管的内衬层，其特征在于，所述增强织物纵向拉伸强度不小于150N/5cm，横向拉伸强度不小于60N/5cm。
  7. 如权利要求6所述的竹缠绕复合管的内衬层，其特征在于，所述增强织物为玻璃纤维针织毡。
  8. 如权利要求7所述的竹缠绕复合管的内衬层，其特征在于，所述树脂为环氧树脂、乙烯基酯树脂、不饱和聚酯树脂中的一种。
  9. 如权利要求7所述的竹缠绕复合管的内衬层，其特征在于，所述内衬层的厚度范围为1.2mm～1.8mm。
  10. 一种如权利要求1-9任一项所述的竹缠绕复合管的内衬层的制备方法，其特征在于，包括如下步骤：
    (1)制备脱模层：在管模具上缠绕聚酯薄膜以获得脱模层；
    (2)配制胶黏剂：向树脂中添加一定比例的固化剂，搅拌混合均匀，以获得胶黏剂；
    (3)制备天然纤维织物层：在所述脱模层的表面淋一层胶黏剂，同时缠绕天然纤维织物，使该胶黏剂浸润该天然纤维织物，以获得天然纤维织物层(1)；
    (4)制备增强织物层：在所述天然纤维织物层(1)的表面淋一层胶黏剂，同时缠绕增强织物，用滚刷在所述增强织物表面滚压，使该胶黏剂浸润该增强织物并赶尽气泡，以获得增强织物层(2)；
    (5)固化处理：将所述管模具连同制备好的内衬层进行固化处理，固化完成后获得所需的内衬层。
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