CN102875885A

CN102875885A - PE-RT (polyethylene of raised temperature resistance) floor heating pipe material and preparation method thereof

Info

Publication number: CN102875885A
Application number: CN2012104044071A
Authority: CN
Inventors: 张显宝
Original assignee: HEFEI ANLO NEW CONSTRUCTION MATERIALS CO Ltd
Current assignee: HEFEI ANLO NEW CONSTRUCTION MATERIALS CO Ltd
Priority date: 2012-10-18
Filing date: 2012-10-18
Publication date: 2013-01-16

Abstract

The invention discloses PE-RT (polyethylene of raised temperature resistance) floor heating pipe material. The PE-RT floor heating pipe material is made from, by weight percent, 70-80% of PE-RT, 10-20% of nano CaCO3 for surface pretreatment, 5-10% of pigment, 0.3-1% of anti-crosslinker, 0.5-1% of anti-oxygen, 0.5-2% of surfactant, and 2-5% of dispersant. By adding the nano CaCO3 for surface pretreatment, mechanical properties of the base PE-RT can be improved, and shading performance is improved. The PE-RT floor heating pipe material can reach the standard requirements in terms of pressure resistance, corrosion resistance and heat resistance and is stable in performance and long in service life.

Description

A kind of PE-RT floor heating pipe material and preparation method thereof

Technical field

The invention belongs to the composite polyethylene material technical field, be specifically related to a kind of PE-RT floor heating pipe material and preparation method thereof.

Background technology

PE-RT is a kind of a kind of medium-density polyethylene that adopts special molecular designing and synthesis technique to produce, and it adopts the method for ethene and octene copolymer, obtains unique molecular structure by quantity and the distribution of controlling side chain, improves the thermotolerance of PE pipe.Because the existence of octene short-chain branch makes the macromole of PE uncrystallizable in a tabular crystal, but be applied in several crystal, having formed the connection between the crystal, it has kept the good snappiness of PE pipe, high thermal conductivity and inertia, it is better to make it simultaneously resistance to pressure.

The PE-RT pipe in heat resistant type pressure-bearing field, is particularly used the advantage with uniqueness in the terrestrial surface radiation engineering because having good heat resistance and long-term withstand voltage properties.PE-RT pipe is used for floor heating pipeline and has many advantages, has satisfactory stability and long-term withstand voltage properties such as it, and have good heat resistanceheat resistant creep property and be easy to crooked convenient construction, and the advantage such as shock resistance is good.At present, the PE-RT pipe exists the shortcoming of machine-shaping property, antimetal performance, heat resistance and resistibility of slow crack growth poor-performing.

Summary of the invention

The object of the invention is to for the deficiencies in the prior art, a kind of PE-RT floor heating pipe material with excellent mechanical performances, environmental stress cracking resistance is provided, also provide its preparation method simultaneously, the method production cost is low, and environmental pollution is little.

Above-mentioned purpose of the present invention is achieved by the following scheme:

A kind of PE-RT floor heating pipe material is made by the raw material of following weight per-cent: polythene PE-RT70～80%, the nanometer CaCO of surface preparation ₃10～20%, pigment 5～10%, resistance linking agent 0.3～1%, antioxidant 0.5～1%, tensio-active agent 0.5～2%, dispersion agent 2～5%, described resistance linking agent is dimethyl sulfoxide (DMSO), dimethylamine or dimethyl formamide; Described dispersion agent is low-molecular polyethylene wax; Described tensio-active agent is the polysiloxane organic silicon surfactant.

For further improving the product performance of PE-RT floor heating pipe material, to count by weight percentage, the combinatorial optimization of raw material is: polythene PE-RT 70%, the nanometer CaCO of surface preparation ₃15%, pigment 8%, resistance linking agent 1%, antioxidant 1%, tensio-active agent 2%, dispersion agent 3%.

The preparation method of PE-RT floor heating pipe material is as follows:

(1) with the nanometer CaCO of surface preparation ₃, resistance linking agent, antioxidant, tensio-active agent, dispersion agent in adding high speed mixer, under 70～80 ℃ of conditions, high-speed stirring 30～60min emits material, is added in the twin screw extruder hopper, carries out extruding pelletization; Processing condition are: 180～185 ℃ of heating medial temperatures, driving screw rotating speed 1000～1100r/m in, feed screw rotating speed 1100～1200r/m in, 80～90 ℃ of bake out temperatures, stock cutter rotating speed 1100～1300r/m in;

(2) master batch that (1) is made and polythene PE-RT and pigment mix, and are added in the injection moulding machine elevating hopper, and first cold mixed in high mixer, then heat is mixed, molding, granulating on the molding, granulating machine; Be added in the injection moulding machine elevating hopper, injection moulding makes tubing; Processing condition are: 200～250 ℃ of heating medial temperatures, injection pressure 6～7MPa, injection cycle 10～20min.

Compared with prior art, the present invention has following beneficial effect:

The nanometer CaCO of the surface preparation that adds among the present invention ₃, because strong interfacial interaction between the nano effect that nanoparticle brings and nanoparticle and matrix can make the material mechanical performance of base-material PE-RT be improved, opacifying property improves.The adding of resistance linking agent has been stopped the catalyzed reaction that metal ion that the destruction of PE-RT material melt frenulum chain in high temperature, the high shear rate situation or relict catalyst and other auxiliary agent discharges causes and has been produced cross-linking agent, guarantee that tube extrusion production is normal, the mechanical property that has guaranteed PE-RT tubing does not reduce and increases.Resistance to pressure of the present invention, erosion resistance, resistance toheat reach standard-required, the stable performance of product, long service life.

Embodiment

Embodiment 1

A kind of PE-RT floor heating pipe material, the weight percent of each component is: polythene PE-RT 70%, the nanometer CaCO of surface preparation ₃15%, pigment 8%, resistance linking agent (dimethyl formamide) 1%, antioxidant 1%, tensio-active agent 2%, dispersion agent 3%.

During preparation, first with the nanometer CaCO of surface preparation ₃, resistance linking agent, antioxidant, tensio-active agent, dispersion agent in adding high speed mixer, under 70～80 ℃ of conditions, high-speed stirring 30～60min emits material, is added in the twin screw extruder hopper, carries out extruding pelletization; Processing condition are: 180～185 ℃ of heating medial temperatures, driving screw rotating speed 1000～1100r/m in, feed screw rotating speed 1100～1200r/m in, 80～90 ℃ of bake out temperatures, stock cutter rotating speed 1100～1300r/m in;

The above-mentioned master batch that makes and polythene PE-RT and pigment are mixed again, be added in the injection moulding machine elevating hopper, first cold mixed in high mixer, then heat is mixed, molding, granulating on the molding, granulating machine; Be added in the injection moulding machine elevating hopper, injection moulding makes tubing; Processing condition are: 200～250 ℃ of heating medial temperatures, injection pressure 6～7MPa, injection cycle 10～20min.

Embodiment 2

A kind of PE-RT floor heating pipe material, the weight percent of each component is: polythene PE-RT 80%, the nanometer CaCO of surface preparation ₃10%, pigment 5%, resistance linking agent (dimethyl formamide) 1%, antioxidant 0.5%, tensio-active agent 0.5%, dispersion agent 3%.The preparation method is identical with embodiment 1.

Embodiment 3

A kind of PE-RT floor heating pipe material, the weight percent of each component is: polythene PE-RT 70%, the nanometer CaCO of surface preparation ₃15%, pigment 10%, resistance linking agent (dimethyl sulfoxide (DMSO)) 0.3%, antioxidant 0.5%, tensio-active agent 1.2%, dispersion agent 3%.The preparation method is identical with embodiment 1.

The tubing that above-described embodiment is made adopts following testing method to detect; Melt index adopts the method for GB/T3682-2000 regulation to measure; Tensile property is pressed the method for GB/T1040-92 regulation and is measured, and draw speed is 50mm/min; The temperature tolerance performance adopts Vicat softening point to represent, GB/T1633-2000 is adopted in test; Thermostability and aging resistance testing method are as follows: with the PP Pipe Compound compressing tablet of unmodified PE-RT polyethylene and preparation, clamp with metal copper plate, place 110 ℃ of baking ovens, aging 3000 hours, then measure oxidation induction period, oxidation induction period adopts the method for plastic pipe heat stability testing standard GB/T17391-1998 regulation.Bending property is pressed the method for GB/T9431-2000 regulation and is measured, and the various performance parameters that records sees Table 1:

The performance perameter of each embodiment tubing of table 1

Claims

1. PE-RT floor heating pipe material is characterized in that described PE-RT floor heating pipe material made by the raw material of following weight per-cent:

Described resistance linking agent is dimethyl sulfoxide (DMSO), dimethylamine or dimethyl formamide; Described dispersion agent is low-molecular polyethylene wax; Described tensio-active agent is the polysiloxane organic silicon surfactant.

2. a kind of PE-RT floor heating pipe material according to claim 1 is characterized in that described PE-RT floor heating pipe material made by the raw material of following weight per-cent:

。

3. the preparation method of a kind of PE-RT floor heating pipe material claimed in claim 1 is characterized in that comprising the steps: