阅读说明：本技术 一种预制直埋保温管的处理方法 (A kind of processing method of prefabricated direct-buried thermal insulation pipe ) 是由 张明人 陈琪鸿 王丽 柴炜隆 于 2019-08-08 设计创作，主要内容包括：本发明提供了一种预制直埋保温管的处理方法,预制直埋保温管包括聚乙烯外护管、内芯管和充填在二者之间的聚氨酯硬质泡沫,其中,聚氨酯硬质泡沫采用发泡的方式充填在聚乙烯外护管和内芯管之间,在聚氨酯硬质泡沫发泡前,利用弹性粘接剂对聚乙烯外护管的内壁全表面进行极化处理。中间弹性粘接层在聚乙烯外护管和聚氨酯硬质泡沫塑料之间形成了一个全封闭层,对聚氨酯硬质泡沫塑料全界面起到密封作用,可以防止由于外护管以外破损、造成的地下水渗入聚氨酯硬质泡沫塑料材料内部,造成产品失效,对产品使用的安全性得到提高,这是其他极化处理无法达到的效果。(The present invention provides a kind of processing methods of prefabricated direct-buried thermal insulation pipe, prefabricated direct-buried thermal insulation pipe includes polyethylene outer protective pipe, the hard polyurethane foam of inner core tube and filling between, wherein, hard polyurethane foam is filled between polyethylene outer protective pipe and inner core tube by the way of foaming, before hard polyurethane foam foaming, it is polarised using the full surface of inner wall of the elastic adhesive to polyethylene outer protective pipe.Middle spring adhesive layer forms a totally-enclosed layer between polyethylene outer protective pipe and polyurethane rigid foam plastic, sealing function is played to the full interface of polyurethane rigid foam plastic, can prevent as it is damaged other than outer protection tube, caused by Groundwater infiltration polyurethane rigid foam plastic material internal, cause product failure, the safety that product uses is improved, this is the effect that other polarization process are unable to reach.)

1. a kind of processing method of prefabricated direct-buried thermal insulation pipe, prefabricated direct-buried thermal insulation pipe includes polyethylene outer protective pipe, inner core tube and fills Fill out hard polyurethane foam between, wherein hard polyurethane foam is filled in outside polyethylene by the way of foaming It is complete using inner wall of the elastic adhesive to polyethylene outer protective pipe before hard polyurethane foam foaming between pillar and inner core tube Surface is to be polarised it.

2. a kind of processing method of prefabricated direct-buried thermal insulation pipe as described in claim 1, which is characterized in that

The elastic adhesive is sprayed on the inner wall of polyethylene outer protective pipe by way of high pressure painting.

3. a kind of processing method of prefabricated direct-buried thermal insulation pipe as described in claim 1, which is characterized in that

The coating thickness of the elastic adhesive is 100-200um.

4. a kind of processing method of prefabricated direct-buried thermal insulation pipe as described in claim 1, which is characterized in that

The elastic adhesive specifically selects spraying neoprene, SBS spraying glue or CR/MMA-AA Forecast of Grafted Adhesive.

5. a kind of processing method of prefabricated direct-buried thermal insulation pipe as claimed in claim 4, which is characterized in that

The spraying neoprene glue formula:

6. a kind of processing method of prefabricated direct-buried thermal insulation pipe as claimed in claim 4, which is characterized in that

SBS sprays glue formula:

7. a kind of processing method of prefabricated direct-buried thermal insulation pipe as claimed in claim 4, which is characterized in that

CR/MMA-AA Forecast of Grafted Adhesive formula:

Technical field

The present invention relates to road thermal-insulation anticorrosion technical fields, more particularly to a kind of processing of prefabricated direct-buried thermal insulation pipe Method.

Background technique

Currently, both at home and abroad in polyethylene outer protective pipe rigid polyurethane foam prefabricated direct-buried thermal insulation pipe product standard, All the adhesive shear strength between polyethylene outer protective pipe and polyurethane rigid foam plastic is proposed and is distinctly claimed, Europe Standard and national standard " high-density polyethylene external protective pipe rigid polyurethane foam prefabricated direct-buried thermal insulation pipe and pipe fitting " (GB/T It 29047-2012) is required to the tangential shear strength >=0.2MPa of insulating tube, axial direction shear strength >=0.12MPa, this index is The key index of product quality.

Since polyethylene belongs to non-polar material, it is not processed and is difficult to form bonding force with other materials, to make polyethylene Bonding force is generated in contact surface with other materials, it is necessary to is polarised to polyethylene surface.

There are two classes to the method for outer protection tube inner wall polarization process now.That is corona polarizing and structural polarization, corona polarizing Using more, relatively early but at high cost, polarization retention time is short, bonding force disappears as time goes by, adhesive strength after polarization It is difficult to stablize in 0.2MPa, it is difficult to long-term, stable to guarantee product weight.

Structural polarization is exactly to handle the thick good fortune of outer protective polyethylene inside pipe wall, wherein patent CN1296882A thermion Stream injection polarization method should belong to a kind of polarization method by the thick good fortune of outer protective polyethylene inside pipe wall, by will be in outer protection tube The thick good fortune of wall (feather plucking) allows polyurethane and polyethylene to form structural connectivity to reach polarization purpose, reaches polyethylene outer protective pipe With the adhesive shear strength of rigid polyurethane foam.

Although structural polarization makes product reach polyethylene outer protective pipe shearing bonding with rigid polyurethane foam Intensity, but its side effect lacks clearly.The reason of for sub-polyethylene minor structure, polyethylene belongs to life-cycle shrink-down material, Polyethylene outer protective pipe is axially and radially being shunk always in use, since structural polarization limits polyethylene outer protective pipe Contraction distortion, the continuous accumulation of distortion stress inside polyethylene outer protective pipe, when stress is more than polyethylene outer protective pipe limit stress It frees and exposes pipe phenomenon.Therefore, the outer protection tube for having done polarization process is more more than the polyethylene outer protective pipe for not being used as polarization process Generation exposes event of running affairs, and to solve to expose event of running affairs, proposes higher performance requirement to the polyethylene raw material of outer protection tube, causes resource Waste.

Summary of the invention

In view of techniques discussed above problem, the embodiment of the invention provides a kind of processing sides of prefabricated direct-buried thermal insulation pipe Method.

A kind of processing method of prefabricated direct-buried thermal insulation pipe, prefabricated direct-buried thermal insulation pipe include polyethylene outer protective pipe, inner core tube and The hard polyurethane foam of filling between, wherein hard polyurethane foam is filled in polyethylene by the way of foaming Between outer protection tube and inner core tube, before hard polyurethane foam foaming, using elastic adhesive to the inner wall of polyethylene outer protective pipe Full surface is polarised.

Preferably, the elastic adhesive is sprayed on the inner wall of polyethylene outer protective pipe by way of high pressure painting.

Preferably, the coating thickness of the elastic adhesive is 100-200um.

Preferably, the elastic adhesive specifically selects spraying neoprene, SBS spraying glue or CR/MMA-AA to connect Branch adhesive.

It is illustrated below as the formula of three different selections

The first, neoprene glue formula (according to mass fraction) is used in the described spraying:

The second, SBS sprays glue formula (according to mass fraction):

Third, CR/MMA-AA Forecast of Grafted Adhesive formula (according to mass fraction):

The cutting performance that the present invention selects different bonding agent to reach is as follows:

A kind of processing method of prefabricated direct-buried thermal insulation pipe provided by the invention is to use elastic adhesive as polarization material, It forms intermediate adhesive layer and nonpolar polyethylene outer protective pipe is subjected to be bonded, cementability with rigid polyurethane foam The performance that elastic adhesive can be depended primarily on selects suitable elastic adhesive in current material, fully achieve and Considerably beyond the index request of 0.2MPa.

The formation of intermediate adhesive layer, the elasticity that will be deployed in proportion using high pressure airless spray equipment and interior spraying equipment Bonding agent even application forms thickness in 100- 200um bonding agent middle layer to polyethylene outer protective pipe inner wall surface.By viscous Agent middle layer is connect to be bonded polyethylene outer protective pipe and rigid polyurethane foam surface.

Intermediate elastic adhesive layer itself has certain deflection while reaching adhesive shear strength, and elasticity becomes Shape amount is even greater than the contraction distortion amount of polyethylene outer protective pipe, can deform with polyethylene shrink, be deformed together without Adhesive strength is influenced, restrained and accumulation of distortion stress will not be deformed due to polyethylene outer protective pipe, solved since polarization constrains Polyethylene outer protective pipe deformation generates the accident of stress accumulation and booster, can reduce to polyethylene outer protective pipe material performance It is required that reducing, cost of goods manufactured, economize on resources consumption.

Middle spring adhesive layer formd between polyethylene outer protective pipe and polyurethane rigid foam plastic one it is totally-enclosed Layer, plays sealing function to the full interface of polyurethane rigid foam plastic, can prevent as it is damaged other than outer protection tube, caused by Groundwater infiltration polyurethane rigid foam plastic material internal, causes product failure, is mentioned to the safety that product uses Height, this is the effect that other polarization process are unable to reach.

Specific embodiment

The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention is never It is limited to any concrete configuration and algorithm set forth below, but covers member under the premise of without departing from the spirit of the present invention Any modification, replacement and the improvement of element, component and algorithm.In the following description, well known structure and technology is not shown, It is unnecessary fuzzy to avoid causing the present invention.

Example embodiment is described referring now to ground, example embodiment can be implemented in a variety of forms, and should not be by It is considered limited to embodiment set forth herein；On the contrary, these embodiments are provided so that the present invention more comprehensively and completely, and The design of example embodiment is comprehensively communicated to those skilled in the art.

In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner In example.In the following description, many details are provided to provide and fully understand to the embodiment of the present invention.However, It will be appreciated by persons skilled in the art that can practice technical solution of the present invention without one in the specific detail or It more, or can be using other methods, constituent element, material etc..In other cases, it is not shown in detail or describes known knot Structure, material or operation are to avoid major technique intention of the invention is obscured.

The present invention provides a kind of processing method of prefabricated direct-buried thermal insulation pipe, and prefabricated direct-buried thermal insulation pipe includes outer protective polyethylene Pipe, the hard polyurethane foam of inner core tube and filling between, wherein hard polyurethane foam is by the way of foaming It is filled between polyethylene outer protective pipe and inner core tube, before hard polyurethane foam foaming, using elastic adhesive to polyethylene The full surface of the inner wall of outer protection tube is to be polarised it.Polyethylene is non-polar material, should not be bonded with other materials, By spraying adhesive as intermediate adhesive layer, reach the performance Nian Jie with other materials, as method for polarized treatment.Have Cementability is exactly polarization process as a result, spraying adhesive makes plastic pipe inner wall have cementability, therefore spraying adhesive is exactly A kind of mode of polarization process.

Preferably, the elastic adhesive is sprayed on the inner wall of polyethylene outer protective pipe by way of high pressure painting.

Preferably, the coating thickness of the elastic adhesive is 100-200um.

Preferably, the elastic adhesive specifically selects spraying neoprene, SBS spraying glue or CR/MMA-AA to connect Branch adhesive.

It is illustrated below as the formula of three different selections

The first, neoprene glue formula (according to mass fraction) is used in the described spraying:

The second, SBS sprays glue formula (according to mass fraction):

Third, CR/MMA-AA Forecast of Grafted Adhesive formula (according to mass fraction):

The cutting performance that the present invention selects different bonding agent to reach is as follows:

A kind of processing method of prefabricated direct-buried thermal insulation pipe provided by the invention is to use elastic adhesive as polarization material, It forms intermediate adhesive layer and nonpolar polyethylene outer protective pipe is subjected to be bonded, cementability with rigid polyurethane foam The performance that elastic adhesive can be depended primarily on selects suitable elastic adhesive in current material, fully achieve and Considerably beyond the index request of 0.2MPa.

The formation of intermediate adhesive layer, the elasticity that will be deployed in proportion using high pressure airless spray equipment and interior spraying equipment Bonding agent even application forms thickness in 100- 200um bonding agent middle layer to polyethylene outer protective pipe inner wall surface.By viscous Agent middle layer is connect to be bonded polyethylene outer protective pipe and rigid polyurethane foam surface.

Intermediate elastic adhesive layer itself has certain deflection while reaching adhesive shear strength, and elasticity becomes Shape amount is even greater than the contraction distortion amount of polyethylene outer protective pipe, can deform with polyethylene shrink, be deformed together without Adhesive strength is influenced, restrained and accumulation of distortion stress will not be deformed due to polyethylene outer protective pipe, solved since polarization constrains Polyethylene outer protective pipe deformation generates the accident of stress accumulation and booster, can reduce to polyethylene outer protective pipe material performance It is required that reducing, cost of goods manufactured, economize on resources consumption.

Middle spring adhesive layer formd between polyethylene outer protective pipe and polyurethane rigid foam plastic one it is totally-enclosed Layer, plays sealing function to the full interface of polyurethane rigid foam plastic, can prevent as it is damaged other than outer protection tube, caused by Groundwater infiltration polyurethane rigid foam plastic material internal, causes product failure, is mentioned to the safety that product uses Height, this is the effect that other polarization process are unable to reach.

Those skilled in the art will be understood that above-described embodiment is illustrative and not restrictive.In different embodiments The different technologies feature of middle appearance can be combined, to obtain beneficial effect.Those skilled in the art research specification and On the basis of claims, the embodiment of other variations of revealed embodiment is will be understood that and realized.In claim In book, term " comprising " is not precluded from other devices or steps；Indefinite article "one" be not excluded for it is multiple；Term " first ", " second " is for indicating title not for any specific sequence of expression.