CN102085720A

CN102085720A - Moulding device of temperature-resistant pressure-resistant axial self-reinforced plastic pipe special for oil treatment

Info

Publication number: CN102085720A
Application number: CN2009101917820A
Authority: CN
Inventors: 张贤明; 袁毅; 曾晓松; 申开智
Original assignee: Chongqing Technology and Business University
Current assignee: Chongqing Technology and Business University
Priority date: 2009-12-07
Filing date: 2009-12-07
Publication date: 2011-06-08

Abstract

The invention relates to a device for manufacturing various plastic pipe parts. The invention is characterized in that the moulding device comprises a device for generating a temperature gradient field in which the temperature is controlled in sections and a device for generating an axial tension stress field, and a temperature gradient field and axial tension stress filed coupled pipe-extruding moulding process can be realized. For the plastic pipe produced by utilizing the device in the invention, the strength and the modulus are axially enhanced, the configuration of material properties is optimized, and the satisfaction degree of the pipe to the actual requirement for the material property is improved. After the pipe is reinforced by the device in the invention, the axial orientation degree of the pipe is higher compared with a conventional pipe, and the crystal plate of the reinforced pipe is enhanced to be thicker and the crystallinity is higher, thus the temperature-resistance performance of the pipe is improved compared with the conventional pipe and the pipe is especially applicable to a pipeline special for the oil treatment. The device in the invention has the advantages of less investment, low production cost, excellent product properties, and better industrialization prospect.

Description

The shaped device of the special-purpose heat resisting and pressure resisting axial self-reinforced plastic pipe of a kind of oil processing

Technical field:

Present technique relates to the former that various plastic pipe products are manufactured, and especially relates to the special-purpose heat resisting and pressure resisting plastic pipe of oil processing is realized self-reinforcing on it is axial extrusion equipment.

Background technology:

In the waste oil recycling and the process of re-refining, the pipeline of delivering oil not only needs to bear corrosion, but also often needs to bear certain pressure and temperature.But plastic pipe is plastic products after all, its stiffness and strength and heat resistance etc. are all far away from cast iron pipe, in order to satisfy the application in the waste oil recycling and the process of re-refining, just need to improve the compressive resistance and the heat resistance of plastic pipe, as adopt commonsense method to improve the wall thickness that its intensity just must increase tubing, but wall thickness has brought again by nonuniform heating or cooling after increasing, during solid-state phase changes with Volume Changes, the additional internal stress that factors such as the difference of each several part deformation extent and contraction obstruction cause, these additional internal stress will be through making the force-bearing situation of tubing worsen more after the stack.Therefore rely on the method that increases tube wall thickness will cause the internal stress of tubing to produce more disadvantageous synergistic effect merely, and the degradation factor also make the wall thickness of tubing not thicken arbitrarily under the economic benefit that causes because wall thickness increase materials increase.And conventional at present plastic pipe extrusion equipment device also can't overcome the predicament of so facing a difficult choice.Though also developed the shaped device of many self-reinforced plastic pipes in recent years, but since self-reinforced structure by these tubing of being obtained of device and effect again because it is in higher temperature environment a large amount of fusions reply and disappear, thereby to improve effect be not obvious especially all the time.

Summary of the invention:

The objective of the invention is to overcome tubing that the plastic pipe extrusion equipment device of present routine produced and can't satisfy not only thin-walled, low-cost but also have a deficiency of higher stiffness and heat resistance etc. simultaneously, particularly the new method that is occurred in recent years can't be retained the deficiency of self-reinforced structure and effect in a large number, provides a kind of can and the interpolation at same wall thickness to promote tubing axial strength and heat resistance under the prerequisite of any other reinforcing agent simultaneously significantly and these are improved the extrusion equipment device that effect remains well.

The object of the present invention is achieved like this: in order to promote the tubing axial strength, and don't increase its wall thickness and add other any reinforcing agents, then special a kind of temperature gradient field of design and axial tensile stress field coupling extruded axial self-reinforcing tube forming device, utilize the temperature gradient field of this device and the coupling of axial tensile stress field in the extrusion molding process, to form along the big molecule of tubing axial orientation crystallization, the high-performance condensed state structure of polymer such as shish-kebab and shish-kebab interlocking, and these high-performance condensed state structures are resided in the heterogeneous microstructure of final products.Be characterized in whole forming process is applied the temperature gradient field of a sectional temperature control and the tubing of extrusion molding is applied the axial tensile stress field, make microstructures such as polymer macromolecule and macromolecular chain under the influence of this axial tensile stress field drives, form big molecule along the crystallization of tubing axial orientation, the high-performance condensed state structure of polymer such as shish-kebab and shish-kebab interlocking utilizes the sectional temperature-controlled function of temperature gradient field will axially strengthen temperature behind the profiled section simultaneously and is controlled at and makes the big molecule along the crystallization of tubing axial orientation that is obtained in the solid plastics temperature environment that is lower than under the melting temperature, the high-performance condensed state structure of polymer such as shish-kebab and shish-kebab interlocking resides in the heterogeneous microstructure of goods in a large number.

Apparatus of the present invention are achieved in that the mechanism of the axial self-reinforcing of tubing to allow plastic material axial tensile stress field by this device in the process of extrusion molding plastic pipe, this stress field is produced and control and regulation by a special crowded pipe unit, and this device is in the temperature gradient field of a sectional temperature control always.In the extrusion molding process of plastic pipe, during trending extensional tectonic stress field that molten plastic is produced by the stretching astringent runner between mouth mould and the plug of this device, the big molecule of polymer and macromolecular chain be just along tensile stress field direction oriented crystalline, and finally form the high performance condensed state structure of the polymer such as big molecule, shish-kebab and shish-kebab interlocking of oriented crystalline.Sectional temperature-controlled function by the temperature gradient field in this device just remains the formation in a single day of these structures crystallization fusion and the orientation answer of having avoided under the condition of high temperature in polymer pipe simultaneously.Apparatus of the present invention that Here it is can make polymer pipe obtain the mechanism of axial self-reinforcing.

The sectional temperature-controlled function that the principle that apparatus of the present invention successfully strengthen the oriented crystalline structure of polymer macromolecule properties of product is applied to the manufacturing industry of plastic pipe and the temperature gradient field by this device is kept these performances, therefore, the plastic pipe that utilizes apparatus of the present invention to produce, enhancing on the intensity of tubing and modulus all can obtain has axially promoted the satisfied current demand that is subjected to interior pressure pipe material to material property.The wafer thickness of tubing is thicker after strengthening, and degree of crystallinity is higher, thereby the also more conventional tubing of its heat resistance has improvement, is especially suitable for use as to be the oil processing pipe special.Apparatus of the present invention equipment investment is few, and producing cost is cheap and product properties is good, has the good industrialized prospect.

Description of drawings:

Fig. 1 is temperature gradient field of the present invention and the crowded pipe unit structural principle schematic diagram of axial tensile stress field coupling

The microcosmic molecular structure model schematic diagram of the axial self-reinforcing tubing inside that Fig. 2 produces for apparatus of the present invention

Among the figure:

1. mouthful mould, 2. molten plastic, 3. plug, 4. molten plastic, 5. temperature control and regulation device, the 6. big molecule of oriented crystalline, 7. oriented crystalline shish-kebab structure, 8. oriented crystalline shish-kebab interlocking structure.

I. die temperature I section, II. die temperature II section, III. die temperature III section, IV. die temperature IV section.

A. plastics molten condition A, B. plastics molten condition B, C. plastics molten condition C, D. plastics molten condition D.

A. straight runner section, b. trending extensional tectonic stress field section, c. cooling and shaping section.

Specific embodiment:

Before squeezing pipe production, it is on the melting temperature that the die temperature segmentation that temperature section control and regulation function by temperature control and regulation device 5 is squeezed pipe unit with whole axial tensile stress field is controlled to be die temperature I section, die temperature II section is melting temperature+5 ℃ sections, die temperature III section is melting temperature-5 a ℃ section, die temperature IV section is the solid plastics section under the melting temperature, then the state of each section of plastic melt is in Zhuan Zhi the temperature stabilization deutostoma mould: A is the molten state plastics, B is the molten state plastics, C is the semisolid plastics, and D is a solid plastics.Open extruder and extrude molten plastic 2,4, molten plastic 2,4 has been cooled to semisolid plastic melt C when flowing through trending extensional tectonic stress field section b.When molten plastic 4 was flowed through the formed trending extensional tectonic stress field section b of plug 3 and mouthful mould 1, the big molecule of polymer and macromolecular chain had just formed big molecule 6, shish-kebab structure 7, the shish-kebab interlocking structure 8 along the crystallization of tubing axial orientation under the influence driving of this axial tensile stress field.Simultaneously because these big molecules 6 along the crystallization of tubing axial orientation, shish-kebab structure 7, shish-kebab interlocking structure 8 just enter after forming in the solid plastics temperature environment of mouth mould IV section of section under the melting temperature immediately, thereby these structures are in case form and just remain the axial properties that impel tubing in a large number obtain to strengthen improvement in polymer pipe.

Claims

1. the shaped device of the special-purpose heat resisting and pressure resisting axial self-reinforced plastic pipe of oil processing is characterized in that this shaped device contains two generating means of temperature gradient field and axial tensile stress field.

2. the shaped device of the special-purpose heat resisting and pressure resisting axial self-reinforced plastic pipe of a kind of oil processing according to claim 1 is characterized in that the temperature gradient field generating means of this device mainly comprises the temperature control and regulation device that can realize sectional temperature-controlled function.

3. the shaped device of the special-purpose heat resisting and pressure resisting axial self-reinforced plastic pipe of a kind of oil processing according to claim 1, the axial tensile stress field generating means that it is characterized in that this device are provided with one and produce the axial astringent runner of axial tensile stress field by plug and the mobile inducing action of stretching convergence between mouthful mould.