CN103497289B - The effective material of no-dig technique type cable protection and cable protection pipe - Google Patents

Abstract

The invention relates to a material for a non-excavation type cable protection pipe. The material is mainly composed of modified polypropylene and low-density polyethylene, and the modified polypropylene used is recycled polypropylene. In terms of weight percentage, its material includes the following components, modified polypropylene (MPP) 75-85%, low-density polyethylene 10-15%, initiator 0.1-1%, auxiliary agent 0.5-6%, antioxidant 0.1-0.5% and color masterbatch 1.5-2.5%. Compared with the traditional MPP material for cable protection pipes, the non-excavation type cable protection pipe material of the present invention has good rigidity and flexibility comprehensive performance, and the cost of raw materials is low, so it has good market application prospects.

Description

Materials for non-excavation cable protection pipes and cable protection pipes

technical field

The invention relates to a material for a non-excavation type cable protection pipe and a non-excavation type cable protection pipe formed therefrom.

Background technique

With the introduction of non-excavation technology, major cities have adopted a large number of underground non-excavation technology to lay plastic cable pipes to transmit electricity, and the demand has increased dramatically. At present, the non-excavation type MPP cable protection tube occupies a large proportion in the market. Modified polypropylene (MPP) pipe has excellent characteristics such as light weight, good comprehensive performance of rigidity and flexibility, high welding strength, and good high and low temperature resistance. However, compared with PE pipes, the cost price of MPP pipes is higher. In the production process, how to further reduce the cost on the basis of maintaining the performance of the existing MPP pipe is a key task.

Contents of the invention

The object of the present invention is to provide a non-excavation type cable protective pipe material with excellent rigidity and flexibility and low raw material cost and the formed protective pipe.

The invention provides a material for non-excavation type cable protection tube, the raw materials of which consist of:

Preferably, among the raw materials of the above-mentioned materials:

Preferably, the material for the non-excavation type cable protection pipe is prepared from the above-mentioned raw materials through premixing, thermalization, extrusion and granulation.

Preferably, the material for the non-excavation type cable protection tube is pre-mixed from the above-mentioned raw materials through (1): mixing modified polypropylene, low-density polyethylene and color masterbatch at 1000-1500 rpm for 3 minutes at high speed, and then Add initiators, additives, antioxidants, and continue to mix at high speed for 3 minutes to obtain a premix; and (2) heat and extrude granulation: feed the premix into a twin-screw extruder and preheat for 15 minutes , wherein the temperature of each section of the screw is 120-200°C.

The present invention also provides a non-excavation type cable protection pipe made of the above materials.

The present invention has following effect:

1. The modified polypropylene (MPP) used for this material is a polypropylene (PP) recycled material, which is in line with the national environmental protection recycling industry development policy, saving resources, environmental protection and energy saving.

2. Initiators and auxiliary agents are added to the material to improve the compatibility of MPP and low-density polyethylene (LDPE) through reactions such as grafting and cross-linking.

3. The LDPE added to the material makes up for the defects of low elongation at break and poor toughness of PP recycled materials.

4. Compared with traditional MPP materials for cable protection pipes, this material has good comprehensive performance of rigidity and flexibility.

5. In terms of production cost, compared with traditional MPP materials for cable protection pipes, the cost of this material is reduced by 5-15%.

detailed description

The present invention will be further described below through specific examples.

Example 1:

Preparation of material for non-excavation cable protection pipe

(1) Take raw materials by weight ratio as follows:

MPP is PP recycled material, the brand is 3015G, produced by Shanghai Hongsu Trading Co., Ltd.;

The LDPE brand is 2102TX00, manufacturer: SABIC;

Described initiator is dicumyl peroxide;

The auxiliary agent is styrene (St), as an ethylenic monomer, which provides hydrogen atoms and inhibits the degradation of MPP.

The antioxidant is antioxidant 1010, the CAS number of antioxidant 1010 is: 6683-19-8, the molecular formula is: C ₇₃ H ₁₀₈ O ₁₂ , the chemical name is: tetrakis[β-(3,5-di tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, brand: BASF (ciba ciba);

The grade of the color masterbatch is E2619.

(2) Mix MPP, LDPE and masterbatch at high speed for 3 minutes at 1000-1500 rpm, then add initiator, auxiliary agent and antioxidant, and continue mixing at high speed for 3 minutes to obtain a premix.

(3) Feed the premixed material into the twin-screw extruder, preheat for 15 minutes, wherein the temperature of each section of the screw is 120-200°C, extrude and granulate, and then the non-excavation type cable protection tube material can be produced.

Example 2:

Preparation of material for non-excavation cable protection pipe

The difference from Example 1 is:

The LDPE grade is 2420H, manufacturer: Maoming Petrochemical;

The auxiliary agent is triallyl isocyanate (TAIC), which is a multifunctional monomer and inhibits the degradation of MPP. Used premixing and extruding process are identical with embodiment 1.

Example 3:

Preparation of material for non-excavation cable protection pipe

The difference from Example 1 is:

The LDPE grade is 2420H, manufacturer: Maoming Petrochemical;

The auxiliary agent is trimethylolpropane trimethacrylate (TMPTMA), which is a multifunctional monomer and inhibits the degradation of MPP. Used premixing and extruding process are identical with embodiment 1.

The properties of the materials obtained in the above-mentioned Examples 1-3 are shown in Table 1.

It can be seen from Table 1 that, compared with PP recycled materials and traditional MPP materials for cable protection pipes, the non-excavation type cable protection pipe material prepared by the present invention has good comprehensive performance of rigidity and flexibility.

The tensile strength and elongation at break listed in the table are tested according to GB/T1040-2006, the bending strength is tested according to GB/T9341-2000, and the notched impact strength is tested according to GB/T1043-2008.

Table 1 Material properties

Since the ultimate purpose of the material of the present invention is to make cheap and high-quality cable protection tubes, it is necessary to compare and test the performance of protection tubes made of various materials. The four materials listed in Table 1 (except PP recycled materials) are respectively Processed into a non-excavation type cable protection tube (Ф180*12mm), and tested the performance of these four kinds of protection tubes, the results are shown in Table 2 (all data are measured under the same conditions).

As can be seen from Table 2, the performance indicators of the pipes made in Examples 1, 2, and 3 all meet the technical requirements of the annual bidding documents for cable protection pipes in Jiangsu Province, and compared with traditional MPP cable protection pipes, the production cost is reduced. , has a good market prospect.

Table 2 Pipe Properties

Claims (5)

1. for a material for no-dig technique type cable protection pipe, it is characterized in that, described material to be extruded through premix thermalization by following raw materials according composition and granulation obtains:

Wherein, in described feedstock composition, each component concentration is by weight percentage;

Described modified polypropene is polypropene recycled materials, and its melting index is 0.3g/10min ~ 1.5g/10min, and its trade mark is 3015G; The Low Density Polyethylene of described Low Density Polyethylene to be the trade mark be 2102TX00 or 2420H; Described initiator is dicumyl peroxide; Described auxiliary agent is vinylbenzene, triallyl isocyanate or trimethylolpropane trimethacrylate.

2. material as claimed in claim 1, it is characterized in that, wherein raw materials used composition is as follows:

Wherein, described oxidation inhibitor is antioxidant 1010; The colour batch of described colour batch to be the trade mark be E2619.

3. material as claimed in claim 1 or 2, it is characterized in that, described material is obtained by the method that key step is following:

(1) premix: by modified polypropene, Low Density Polyethylene and colour batch 1,000 rev/min ~ 1,500 revs/min of lower high-speed mixing 3 minutes, then add initiator, auxiliary agent, oxidation inhibitor, continue high-speed mixing and obtain Preblend in 3 minutes; And

(2) thermalization extruding pelletization: Preblend fed in twin screw extruder, preheating is extruding pelletization after 15 minutes, and wherein screw zones temperature is 120 DEG C ~ 200 DEG C.

4. a no-dig technique type cable protection pipe is made up of the material described in claim 1 or 2.

5. a no-dig technique type cable protection pipe is made up of material according to claim 3.