CN101943296A - Novel plastic ribbed pipe - Google Patents

Abstract

The invention belongs to a building buried drainage pipeline, in particular to a novel plastic ribbed pipe. The preparation method of the novel plastic ribbed pipe comprises the following steps: the socially recycled PET resin is used as raw material to prepare a GF-PET/PE plastic alloy material through reinforcing, toughening and extending and the plastic alloy material is used to prepare the novel plastic ribbed pipe. The cost of the novel plastic ribbed pipe is similar to that of PVC-U and the ring stiffness, impact toughness and heat resistance of the pipe are better than that of PVC-U, thus the pipe can be more widely used in the buried drainage pipeline system; and as the pipe has excellent heat resistance, the pipe will be widely used in the power cable buried pipe casing field.

Description

The novel plastic riffled tube

Technical field

The invention belongs to a kind of building buried drain pipe road.

Background technique

Many advantages such as the plastic underground waste pipe has wear-resistant, corrosion-resistant, long service life, and body is light, carrying and installation is time saving and energy saving, and engineering cost is cheap, and is safe and reliable.The buried drain pipe road belongs to high-line conduit, mainly bear external pressure load (pressing load to ignore usually), plastic pipe belongs to flexible pipe, the critical external compressive resistance ability, the form of destroying is that the external pressure load causes the excessive or lateral deflection unstability of tubing distortion, have influence on its extensive use, particularly be subjected to certain limitation in more metropolitan application.The ring stiffness of plastic tube is the imbody of elasticity modulus of materials, and it is the mechanical performance index that characterizes tubing opposing elastic deformability, generally uses ring stiffness to represent the critical external compressive resistance load capacity of plastic underground waste pipe in the world at present.Ring stiffness is the comprehensive parameters of plastic underground waste pipe critical external compressive resistance load capacity, and in order to guarantee plastic underground waste pipe trouble free service under the external pressure load, the selection of ring stiffness is one of key in the design.If the ring stiffness of tubing is too little, excessive deformation may take place or the lateral deflection unstable failure occur in tubing.Otherwise, if ring stiffness is selected De Taigao, must adopt excessive cross sectional moment of inertia, strengthen tube wall thickness, will cause too much with material, cost is too high.In order to improve the ring stiffness of tubing, do not improve the manufacture cost of tubing, perhaps can also suitably reduce the cost of material of tubing, people have invented plastics reinforcement tubing kind.At present the plastics riffled tube is raw materials used PVC-U, FRPP, a PE etc., is main riffled tube kind with the PVC-U riffled tube on the market.

So-called plastics riffled tube means inner wall smooth, and outer wall has the plastic tube of equidistant ring stiffening rib, and promptly the outer wall at tubing is provided with the stiffening rib of countless ring-types perpendicular to tubular axis at interval uniformly along tube axial direction.According to the principle of I-steel, ring stiffener provides tubing high ring stiffness.It is thinner to remedy between the ring stiffener wall thickness of tubing, the deficiency that ring stiffness is also lower is had a surplus, be that this tubing average wall thickness is significantly less than solid wall pipe, but pipeline integral loop rigidity is then apparently higher than solid wall pipe, raw material can save 1/3rd approximately, therefore the tubing cost also has tangible reduction, can reach 16KN as the ring stiffness of reinforcement PVC-U pipe.

But the ring stiffness that the PVC-U riffled tube can reach at present still can not satisfy the needs of engineering under many occasions, and so municipal engineering of polynucleated city in order to reduce possible that road subsides, all need the higher pipeline of ring stiffness.PE riffled tube and FRPP riffled tube price comparison height, for the PVC-U riffled tube, if continue to improve ring stiffness, the tubing cost also will sharply rise.PVC-U riffled tube impact strength is relatively poor in addition, and when ambient temperature was low, the carrying of tubing and installation damage percentage were higher, and this also is to influence its widely used key factor.The heat resistance of PVC-U riffled tube is poor for another example, can not adapt to present development and bury the requirement of ground pillar to the pipeline resistance to heat than power cable faster.Therefore, the plastics riffled tube enlarges on the construction market of China that to use difficulty bigger.Purpose of the present invention promptly is to invent a kind of novel plastics riffled tube, cost is not higher than traditional PVC-U riffled tube, impact toughness is better than the PVC-U riffled tube, ring stiffness is higher than traditional PVC-U riffled tube, heat distortion temperature is greater than 85 ℃, both can satisfy the requirement higher of buried drain pipe road, and can satisfy power cable again and bury the ground pillar the stable on heating requirement of tubing to the tubing ring stiffness.

Summary of the invention

Utilize society to reclaim PET bottle material, after modification in order to make the novel plastic riffled tube.

The PET resin is widely used in making fiber and goods (as cloth, non-weaving cloth etc.) thereof, film, appliance material, liquid packaging bottle etc.2007, PET gross production in whole world was about about 4,000 ten thousand tons.On China market, the annual waste PET beverage bottle that produces reaches nearly 1,000,000 tons, and its recycling is a very big difficult problem, carries out this part reasonable resources and utilizes significant.

GF-PET is the PET that glass strengthens modification, and its performance is very outstanding, and tensile strength can reach 2.4 times of PVC-U, and Young's modulus can reach 2.3 times of PVC-U, and heat distortion temperature can reach about 200 ℃.It is cheap that society reclaims PET bottle material, PET bottle material oneself viscosity is higher, and mostly be disposable use goods, after it is discarded, degree of aging is general and not serious, and when adopting glass to strengthen, the tensile strength of glass fiber content 30% and Young's modulus are about more than 1.5 times of PVC-U, make the plastics riffled tube with it, ring stiffness, heat resistance, cost of material are all big than PVC-U advantage.Blemish in an otherwise perfect thing be that the impact toughness of GF-PET is very poor.Therefore must when PET strengthens modification to society's recovery, carry out toughening modifying, when improving tensile strength and Young's modulus, make its impact toughness be higher than PVC-U.Because of impact toughness differs greatly, toughening modifying can obviously improve the cost of modified product, therefore strengthen, toughness reinforcing in, also must take the increment modified measures, generally be better than new material-GF-PET/PE plastic alloy of PVC-U in the hope of obtained performance, price, and be used to make the novel plastic riffled tube.

The novel plastic riffled tube be with strengthen, toughness reinforcing and increment the GF-PET/PE plastic alloy make.A large amount of societies that use reclaim PET, and it is close that its manufacture cost and traditional reinforcement PVC-U manage, and its ring stiffness, impact toughness and heat resistance all are better than PVC-U.Not only can be applied to buried drain pipe road system widely, and, it is buried in the pillar field, ground at power cable be used widely because of its outstanding heat resistance.

Embodiment

1, after society reclaims the PET bottle and removes the decoration sign film and non-PE bottle cap of non-PET material, wash, dewater, broken, oven dry.

2, strengthening agent (as glass or whisker etc.), extender (also claiming bulking agent) surface activation treatment as French chalk, glass microballoon, calcium carbonate etc.

3, solubilizer can be SEBS, can be EVA, also can be SBS etc.

4, the PE resin can be LDPE, can be LLDPE, also can be HDPE.Can be new PE, also can be to reclaim PE, but the quality of recovery PE needs strict control, can carry out the molecular chain adjustment in case of necessity.

5, other auxiliary agent is prepared as required.

6, said components is pressed (roving glass fiber strengthens exception) after the formulation ratio weighing, mix, adopt banburying melt blending and granulation.Perhaps adopt cocurrent and parallel dual-screw pelletizer melt blending extruding pelletization.Be used for the manufacturing of novel plastic riffled tube then.The ring stiffness of novel plastic riffled tube can be adjusted by the content of GF in the plastic alloy and PET, and impact strength can be adjusted by the content of PE, and Vicat softening point can reach nearly more than 85 ℃.

Claims (4)

1. a novel plastic riffled tube is characterized in that being made by plastic alloy.

2. according to the described novel plastic riffled tube of claim 1, described plastic alloy is characterized in that being made by GF-PET/PE.

3. according to the described GF-PET/PE of claim 2, it is characterized in that be through enhancing, toughness reinforcing, increment modification GF-PET/PE.

4. according to the described GF-PET/PE of claim 2, it is characterized in that making by society's recovery PET bottle material and PE.