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CN107448691A - 一种架空用聚氨酯泡沫预制保温管道及生产方法 - Google Patents

一种架空用聚氨酯泡沫预制保温管道及生产方法 Download PDF

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CN107448691A
CN107448691A CN201710586497.3A CN201710586497A CN107448691A CN 107448691 A CN107448691 A CN 107448691A CN 201710586497 A CN201710586497 A CN 201710586497A CN 107448691 A CN107448691 A CN 107448691A
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polyurethane foam
layer
steel tube
working steel
powder
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陈朋
杨清志
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HENAN SANJIE THERMOELECTRIC TECHNOLOGY Co Ltd
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HENAN SANJIE THERMOELECTRIC TECHNOLOGY Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/14Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218Pretreatment, e.g. heating the substrate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00Layered products having a non-planar shape
    • B32B1/08Tubular products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/095Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04Coatings characterised by the materials used
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00Thermal insulation in general
    • F16L59/14Arrangements for the insulation of pipes or pipe systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/06Coating on the layer surface on metal layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/26Polymeric coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00Composition of foam
    • B32B2266/02Organic
    • B32B2266/0214Materials belonging to B32B27/00
    • B32B2266/0278Polyurethane
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/304Insulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558Impact strength, toughness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/714Inert, i.e. inert to chemical degradation, corrosion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00Tubular articles, e.g. hoses, pipes

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  • General Engineering & Computer Science (AREA)
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Abstract

本发明涉及一种架空用聚氨酯泡沫预制保温管道,包括工作钢管、聚氨酯泡沫保温层以及外护套层,工作钢管与聚氨酯泡沫保温层之间喷涂有环氧粉末涂层,环氧粉末涂层喷涂在工作钢管的外表面,环氧粉末喷涂层为双层环氧粉末喷涂层,包括底层粉末层和面层粉末层;护套层套接在聚氨酯泡沫保温层的外表面,外护套层的外表面设置有半环形挡板,所述挡板嵌接有半圆形管托;本发明通过除锈、加热、喷涂、封堵、注料填充的工艺流程,从而使得本发明具有便于固定、防腐蚀性能强、抗机械冲击力强的优点。

Description

一种架空用聚氨酯泡沫预制保温管道及生产方法
技术领域
本发明属于保温管道技术领域,具体涉及一种架空用聚氨酯泡沫预制保温管道及生产方法。
背景技术
近年来随着人民生活水平的不断提高,北方地区居民使用集中供热的需求不断增加,特别是因前期生活条件限制未使用集中供热既有居住建筑住宅小区;这些既有居住建筑住宅小区因小区内道路无热力管道规划位置,小区内集中供热二级管网无法采用直埋敷设,大部分只能采用架空方式敷设热力管道;小区内冬季供暖是由小区热力站作为热源,通过架空热力管道将50~70 ℃的热水输送至小区居民用户,由于冬季室外温度较低,管道在输送过程中,供热介质温度高于管外环境温度,热量通过供热管道的壁面传递给环境空气,这部分热量称为管道散热损失;因此,要通过对集中供热架空管道进行保温来减少这项热损失。
室外架空管道,长期暴露在室外空气中,保温材料要承受紫外线照射、雨雪冲刷等,因此对保温管道的外护套层的要求比较高;对工作钢管本体的防锈防腐能力要求也不比较高,增加工作钢管的使用寿命和抗机械冲击能力;另外,室外架空管道的固定方式的选择也比较重要,确保保温管道长距离的架空敷设不会发成移位,从而提高保温管道敷设的安全性。
发明内容
本发明的目的是克服现有技术的不足而提供一种便于固定、防腐蚀性能强、抗机械冲击力强的架空用聚氨酯泡沫预制保温管道及其生产方法。
本发明的技术方案如下:
一种架空用聚氨酯泡沫预制保温管道,包括工作钢管、聚氨酯泡沫保温层以及外护套层,所述工作钢管与聚氨酯泡沫保温层之间喷涂有环氧粉末涂层,所述环氧粉末涂层喷涂在工作钢管的外表面;所述外护套层套接在聚氨酯泡沫保温层的外表面,外护套层的外表面设置有半环形挡板,所述挡板嵌接有半圆形管托。
优选的,所述环氧粉末喷涂层为双层环氧粉末喷涂层,包括底层粉末层和面层粉末层。
优选的,所述底层粉末层起到防腐蚀的作用,所述面层粉末层起到抗机械冲击的作用。
优选的,所述外护套层采用金属薄板制成,所述金属薄板为镀锌铁皮或者防锈铝皮中的一种。
优选的,所述工作钢管的一端套接有防水帽。
一种架空用聚氨酯泡沫预制保温管道的生产方法,包括以下步骤,
1)、除锈,对工作钢管进行抛丸除锈,去除其外表面的浮锈或氧化皮等,除锈等级应达到Sa2.5 级,锚纹深度控制在50~90μm;
2)、加热,利用中频加热法对工作钢管进行加热,加热至230℃;
3)、喷涂,采用两套高压静电喷涂机和两个喷粉房依次喷涂底层粉末层和面层粉末层;
4)、喷涂结束后,采用水冷却法对喷涂层进行固化定型;
5)、钢管套穿,在工作钢管的外表面沿着其圆周方向布置T型支撑块,布置时,将T型支撑块采用钢带穿孔固定在工作钢管上,然后利用穿管机将工作钢管穿入外护套层内,并保证工作钢管两端预留一定的留头长度;
6)、液压封堵,管中管端头密封采用液压控制法兰结构,点动控制;法兰内孔与防腐管之间采用密封圈密封,法兰凸台阶与聚乙烯外护管的内径面紧密接触,法兰端面与外护管紧密贴合;在法兰上钻有6个放气孔,内装透气塞;
7)、注料,发泡平台采用倾斜角可调式,倾斜角不超过5°,通过液压缸手动控制;倾斜注料结束后,将平台调节到水平位置发泡;
8)、采用环保型A-350 高压发泡机,将组合聚醚和异氰酸酯两组料通过高压计量泵,按照设定的比例和质量输送到混合室内,两组料在混合室内高速撞击混合,然后以一定的速度和压力( 可达20 MPa )喷射入工作钢管与外护套层见得空腔内;
9)、端头防护,将保温管端头清理干净,切割多余的聚乙烯外护管,保证留头长度, 管的两端头安装防水帽,用以防止保温层进水。
优选的,所述的一种架空用聚氨酯泡沫预制保温管道的生产方法,在进行步骤3)时,根据底层粉末涂层的厚度要求选择喷枪数量, 静电高压一般控制在60 kV,喷涂压力为0.2 MPa, 控制底层粉末的胶化时间。在底层粉末熔融胶化的状态下,开始用另一台喷涂机喷涂面层粉末。
与现有技术相比,本发明的有益效果是:本发明在工作钢管与聚氨酯泡沫保温层之间喷涂双层环氧粉末涂层,从而增加工作钢管的防腐防锈性能和抗机械冲击能力;在外护套层的外表面设置半环形挡板,并采用半圆形管托与半环形挡板配合使用,从而有效的提高架空保温管道的固定效果,有效的避免室外架空管道发生空间位移,保证室外架空保温管道的安全性;本发明中的架空用聚氨酯泡沫预制保温管道在生产的过程中,采用两套高压静电喷涂机和两个喷粉房依次喷涂底层粉末层和面层粉末层,从而使得底层粉末层和面层粉末层对工作钢管起到不同的保护性能。
附图说明
图1为本发明的主视图。
图2为本发明的剖面示意图。
附图标记,1、工作钢管,2、聚氨酯泡沫保温层,3、外护套层,4、环氧粉末涂层,5、挡板,6、管托,7、防水帽。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
如图1-2所示一种架空用聚氨酯泡沫预制保温管道,包括工作钢管1、聚氨酯泡沫保温层2以及外护套层3,所述工作钢管1与聚氨酯泡沫保温层2之间喷涂有环氧粉末涂层4,所述环氧粉末涂层4喷涂在工作钢管1的外表面,;所述外护套层3套接在聚氨酯泡沫保温层2的外表面,外护套层3的外表面设置有半环形挡板5,所述挡板5嵌接有半圆形管托6,在施工时,只需将半圆形管托6焊接在支架上,从而对架空保温管道进行有效固定。
在本实施例中,所述环氧粉末喷涂层4为双层环氧粉末喷涂层,包括底层粉末层和面层粉末层;所述底层粉末层起到防腐蚀的作用,所述面层粉末层起到抗机械冲击的作用;所述外护套层3采用金属薄板制成,所述金属薄板为镀锌铁皮或者防锈铝皮中的一种,从而使得架空用聚氨酯泡沫预制保温管道具有较强的耐氧化、耐腐蚀、抗机械冲击力性能,延长室外架空保温管道的使用寿命;所述工作钢管1的一端套接有防水帽7,用以防止聚氨酯泡沫保温层2进水。
一种架空用聚氨酯泡沫预制保温管道的生产方法,包括以下步骤,
1)、除锈,对工作钢管进行抛丸除锈,去除其外表面的浮锈或氧化皮等,除锈等级应达到Sa2.5 级,锚纹深度控制在50~90μm;
2)、加热,利用中频加热法对工作钢管进行加热,加热至230℃;
3)、喷涂,采用两套高压静电喷涂机和两个喷粉房依次喷涂底层粉末层和面层粉末层;
4)、喷涂结束后,采用水冷却法对喷涂层进行固化定型;
5)、钢管套穿,在工作钢管的外表面沿着其圆周方向布置T型支撑块,布置时,将T型支撑块采用钢带穿孔固定在工作钢管上,然后利用穿管机将工作钢管穿入外护套层内,并保证工作钢管两端预留一定的留头长度;
6)、液压封堵,管中管端头密封采用液压控制法兰结构,点动控制。法兰内孔与防腐管之间采用密封圈密封,法兰凸台阶与聚乙烯外护管的内径面紧密接触, 法兰端面与外护管紧密贴合,形成双密封,以确保不漏料;在法兰上钻有6 个放气孔,内装透气塞, 使泡沫料反应产生的气体可以有效地排出,避免产生空洞;
7)、注料,发泡平台采用倾斜角可调式,倾斜角不超过5°,通过液压缸手动控制;倾斜注料结束后,将平台调节到水平位置发泡;
8)、采用环保型A-350 高压发泡机,将组合聚醚和异氰酸酯两组料通过高压计量泵,按照设定的比例和质量输送到混合室内,两组料在混合室内高速撞击混合,然后以一定的速度和压力(可达20 MPa )喷射入工作钢管与外护套层见得空腔内;
9)、端头防护,将保温管端头清理干净,切割多余的聚乙烯外护管,保证留头长度, 管的两端头安装防水帽,用以防止保温层进水。
在进行步骤3)时,根据底层粉末涂层的厚度要求选择喷枪数量,静电高压一般控制在60 kV,喷涂压力为0.2 MPa,控制底层粉末的胶化时间,在底层粉末熔融胶化的状态下,开始用另一台喷涂机喷涂面层粉末。
采用上述的生产工艺,能够有效保证工作钢管1的外表面的双层环氧粉末涂层4的喷涂均匀,固化效果好,并保证工作钢管1与外护套层3之间填充的聚氨酯泡沫更加均匀,确保不漏料,避免产生空洞,增强架空保温管道的保温性能。
尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (7)

1.一种架空用聚氨酯泡沫预制保温管道,包括工作钢管(1)、聚氨酯泡沫保温层(2)以及外护套层(3),其特征在于:所述工作钢管(1)与聚氨酯泡沫保温层(2)之间喷涂有环氧粉末涂层(4),所述环氧粉末涂层(4)喷涂在工作钢管(1)的外表面;所述外护套层(3)套接在聚氨酯泡沫保温层(2)的外表面,外护套层(3)的外表面设置有半环形挡板(5),所述挡板(5)嵌接有半圆形管托(6)。
2.如权利要求1所述的一种架空用聚氨酯泡沫预制保温管道,其特征在于:所述环氧粉末喷涂层(4)为双层环氧粉末喷涂层,包括底层粉末层和面层粉末层。
3.如权利要求2所述的一种架空用聚氨酯泡沫预制保温管道,其特征在于:所述底层粉末层起到防腐蚀的作用,所述面层粉末层起到抗机械冲击的作用。
4.如权利要求1所述的一种架空用聚氨酯泡沫预制保温管道,其特征在于:所述外护套层(3)采用金属薄板制成,所述金属薄板为镀锌铁皮或者防锈铝皮中的一种。
5.如权利要求1所述的一种架空用聚氨酯泡沫预制保温管道,其特征在于:所述工作钢管(1)的一端套接有防水帽(7)。
6.如权利要求1至5任意一项所述的一种架空用聚氨酯泡沫预制保温管道的生产方法,其特征在于:包括以下步骤,
1)、除锈,对工作钢管进行抛丸除锈,去除其外表面的浮锈或氧化皮等,除锈等级应达到Sa2.5 级,锚纹深度控制在50~90μm;
2)、加热,利用中频加热法对工作钢管进行加热,加热至230℃;
3)、喷涂,采用两套高压静电喷涂机和两个喷粉房依次喷涂底层粉末层和面层粉末层;
4)、喷涂结束后,采用水冷却法对喷涂层进行固化定型;
5)、钢管套穿,在工作钢管的外表面沿着其圆周方向布置T型支撑块,布置时,将T型支撑块采用钢带穿孔固定在工作钢管上,然后利用穿管机将工作钢管穿入外护套层内,并保证工作钢管两端预留一定的留头长度;
6)、液压封堵,管中管端头密封采用液压控制法兰结构,点动控制;法兰内孔与防腐管之间采用密封圈密封,法兰凸台阶与聚乙烯外护管的内径面紧密接触, 法兰端面与外护管紧密贴合;在法兰上钻有6个放气孔,内装透气塞;
7)、注料,发泡平台采用倾斜角可调式,倾斜角不超过5°,通过液压缸手动控制;倾斜注料结束后,将平台调节到水平位置发泡;
8)、采用环保型A-350 高压发泡机,将组合聚醚和异氰酸酯两组料通过高压计量泵,按照设定的比例和质量输送到混合室内,两组料在混合室内高速撞击混合,然后以一定的速度和压力(可达20 MPa )喷射入工作钢管与外护套层见得空腔内;
9)、端头防护,将保温管端头清理干净,切割多余的聚乙烯外护管,保证留头长度, 管的两端头安装防水帽,用以防止保温层进水。
7.如权利要求6所述的一种架空用聚氨酯泡沫预制保温管道的生产方法,其特征在于:在进行步骤3)时,根据底层粉末涂层的厚度要求选择喷枪数量,静电高压一般控制在60kV,喷涂压力为0.2 MPa,控制底层粉末的胶化时间,在底层粉末熔融胶化的状态下,开始用另一台喷涂机喷涂面层粉末。
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