Modified strengthened and toughened polyethylene solid-wall pipe and preparation method thereof

Abstract

The invention relates to a modified strengthened and toughened polyethylene solid-wall pipe, belonging to the technical field of a water supply and drainage device. The modified strengthened and toughened polyethylene solid-wall pipe comprises raw materials of the following weight portions: 100 portions of recycled high-density polyethylene, 18-30 portions of linear low-density polyethylene, 8-15 portions of polyethylene unbleached material and 3-6 portions of catalyst. The invention has the advantages that: the pipe is economical, and the application of the water / sewage drainage pipe can be expanded; non-renewable resources can be saved greatly by adopting the recycled high-density polyethylene; since the high-density polyethylene is modified, the tensile strength of the pipe can reach 24.5-27MPa, the elongation at break is up to 550-750 percent, and the pipe has good flexibility; the use of the catalyst in the formula is reasonable, and the formation of the pipe can be improved; the modification of the recycled high-density polyethylene by the linear low-density polyethylene can be ensured by the preparation method, and the strengthening and toughening effects can be achieved; and the pipe quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of water supply and drainage equipment, and in particular relates to a modified reinforced and toughened polyethylene solid-wall pipe, and also relates to a preparation method thereof. Background technique [0002] Technical information about polyethylene pipes can be found in published Chinese patent documents, such as invention patent authorization announcement number CN101538384B recommending "polyethylene pipes for water supply", which is made of high-density polyethylene 70-80% (weight hundred points), 15-25% (weight percent) of heat-resistant polyethylene, 4.5% (weight percent) of color masterbatch with a carbon black content of 50% and 0.5% (weight percent) of antioxidant 264, consisting of Although the polyethylene pipe produced by the formula can objectively reflect the technical effect mentioned in paragraph 0007 on page 1 of the instruction manual and is suitable for use as a water supply pipe, du...

AI Technical Summary

Problems solved by technology

[0003] Invention patent application publication number CN102030937A provides "a formula for modified composite polyethylene pipe", which is composed of the following raw materials in mass percentage: recycled high-density low-pressure poly Ethylene 40-60%, recycled medium-density low-pressure polyethylene 5-20%, recycled high-pressure polyethylene 5-10%, reinforcing agent (diamond, graphite or ultra-fine coal powder) 5-15% and antioxidant 3 -15%, from the raw materials it chooses and the application number 200810235124.2 (publication number CN101402759A <name: "modified polyethylene pipe for buried sewage discharge") mentioned in paragraph 0004 of the specification, it can be seen that the pipe is buried The pipes for sewage discharge can be inexpensive because the main raw materials are high- and medium-density low-density polyethylene and high-pressure polyethylene recycled from waste and old. However, there are the following shortcomings: First, due to the The aforementioned reinforcing agents, antioxidants, colorants and lubricants have no chemical modification effect on high- and medium-density low-pressure polyethylene and high-pressure polyethylene, so they cannot show ideal elongation at break and tensile strength Second, the addition of diamond, graphite or ultra-fine coal powder as a reinforcing agent will lead to an increase in the brittleness of the pipe, which is not suitable for non-excavation directional drilling and laying, that is to say, it can only be suitable for excavation buried Third, even if it is suitable for excavation laying, it is picky about the soil quality of the place of use. For example, it is not suitable for quicksand soil environment, because quicksand is easy to settle, causing the pipe to break

[0004] Invention Patent Application Publication No. CN101696291A discloses "wear-resistant ultra-high molecular weight polyethylene pipe and its manufacturing method", due to the use of 2.80-2.85 million high molecular weight polyethylene , so the toughness and flexibility are poor, and it cannot be applied to non-excavation directional drilling and laying; looking at the full text of the patent application, it can be seen that this kind of pipe is an oil well pipe, and the price is extremely expensive. 95-98 parts by weight of ethylene is confirmed

[0005] Invention patent application publication number CN102101924A introduces "a kind of processing method of ultra-high molecular weight polyethylene pipe", the patent application scheme has the following deficiencies, one is ultra-high molecular weight Polyethylene accounts for 90-95%, so it is cheap and not conducive to saving resources; second, the addition of graphite as an additive and the use of ultra-high molecular weight polyethylene will increase the brittleness of the pipe and affect the toughness and flexibility; the third is that the preparation method teaches that the raw materials are stirred at a speed of 20n / min for 5 minutes, but under this process condition, carbon black and graphite with a large specificity will appear concentrated precipitation, which is not conducive to dispersion, thus affecting the quality of the pipe; Fourth, because the patent application scheme directly mixes the raw materials and sends them to the extruder for extrusion, there is a lack of pretreatment of the raw materials, such as pre-drying the raw materials, because under factors such as storage, transportation and natural environment changes, If the moisture (moisture content) of the polyethylene raw material is not controlled, it will seriously affect the quality of the pipe

One of the reasons is that people in the field believe that polyethylene pipes are mature products, and it is difficult to make substantial breakthroughs in the selection of raw materials or the ratio of various raw materials, or that there is little room for breakthroughs, thus weakening people's expectations. Awareness of innovation; second, fear that the exploration will be futile and cause financial, material and human resources to be wasted; third, there is a lack of technical communication between pipe manufacturers and pipe construction departments

Images