CN109519147A - A kind of thermotropic expander and preparation method - Google Patents
A kind of thermotropic expander and preparation method Download PDFInfo
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- CN109519147A CN109519147A CN201710836657.5A CN201710836657A CN109519147A CN 109519147 A CN109519147 A CN 109519147A CN 201710836657 A CN201710836657 A CN 201710836657A CN 109519147 A CN109519147 A CN 109519147A
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- memory resin
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- 238000002360 preparation method Methods 0.000 title abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 49
- 239000011347 resin Substances 0.000 claims abstract description 49
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000002184 metal Substances 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000007493 shaping process Methods 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 11
- 238000002425 crystallisation Methods 0.000 claims description 10
- 230000008025 crystallization Effects 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000004568 cement Substances 0.000 abstract description 29
- 239000002002 slurry Substances 0.000 abstract description 8
- 239000011435 rock Substances 0.000 abstract description 7
- 230000006386 memory function Effects 0.000 abstract description 6
- 238000005253 cladding Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 16
- 239000005038 ethylene vinyl acetate Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000003335 steric effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- MUBKMWFYVHYZAI-UHFFFAOYSA-N [Al].[Cu].[Zn] Chemical compound [Al].[Cu].[Zn] MUBKMWFYVHYZAI-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920000431 shape-memory polymer Polymers 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/20—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Springs (AREA)
Abstract
This application discloses a kind of thermotropic expander and preparation methods.The thermotropic expander includes compressed spring and the shape memory resin with its cladding；Shape memory resin content is 5%~80% in the thermotropic expander.Preparation method includes: that the shape memory resin of melting is coated on the metal spring compressed with fixture, and the thermotropic expander is then made after cooling and shaping.Thermotropic expander of the invention, the spring expansion device with temperature control shape memory function, is blended into cementing concrete, it is convenient to be transported to underground appropriate location with cement slurry under squeezed state.As downhole temperature is stepped up, when reaching temperature-controlled conditions, shape memory function triggering, volume expansion.Stop cement slurry to be lost from rock crevice, realizes the efficient closure of rock fracture.Meet efficient well shaft fixing technology requirement, while increasing Toughness of Harden Cement, intensity and service life.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and well cementation, in particular to a thermally induced expander and a preparation method thereof.
Background
The well leakage is one of the common underground complex conditions in the process of well drilling and well cementation. The lost circulation not only consumes the drilling time and loses drilling fluid and cement paste, but also can cause the problems of drill sticking, blowout, well collapse, poor well cementation quality and the like, and even causes the abandonment accident of the well hole, thereby causing great economic loss.
Solving the problem of leakage of oil and gas wells has been the subject of concern in various large oil and gas fields. The conventional well cementation cement paste has no leakage blocking function, but after the inert fiber material is added, a net-shaped structure is easily formed in a leakage passage due to the accumulation and bridging action of the fibers, and the conventional performance of the cement paste is not changed greatly, so that the leakage in the well drilling and well cementation processes can be blocked to a certain degree. And moreover, the addition of the fibers can also improve the toughness of the set cement and ensure that the later perforating operation is better carried out.
The fiber is used as an inert material and is commonly used for preparing fiber cement slurry for well cementation operation. The fiber cement paste is prepared by mixing fiber materials with a certain proportion and length in a cement paste basic formula, the performance of the mixed cement paste is not greatly changed compared with that of primary pulp, and fibers are easy to form a net-shaped structure in a leakage channel through accumulation and bridging. Therefore, the fiber cement slurry can also be used for the lost circulation plugging operation. At present, a fiber plugging cement paste system is mainly formed by changing the addition amount (<5 per thousand, the amount of cement) and the length (1-6mm) of fiber. Such systems typically rely on the operator to add the fibers to the cement truck. It should be noted here that the fibers cannot be dry blended in the cement because of their mass entanglement. Meanwhile, the speed of manually scattering fibers on a cement truck is slow, and the rheological property of cement paste is influenced by excessive addition of the fibers, so that the addition amount is less than 5 per thousand (accounting for the amount of the cement). In addition, the length of the fiber cannot be too long, so that the leakage stoppage effect of the fiber leakage stoppage slurry is limited.
Therefore, a new plugging agent needs to be developed. The leaking stoppage material has the advantages that the ground is in a small-volume state, the leaking stoppage material is convenient to convey underground, and the effective pumping amount can be ensured compared with the traditional fiber; the underground large-volume state generates a volume steric effect, and can effectively block rock cracks.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a thermally induced expander and a preparation method thereof. The invention relates to a thermal expansion device which is a spring expansion device with a temperature control shape memory function, is mixed into well cementation cement in a compressed state and can be conveniently conveyed to a proper position underground along with cement slurry by utilizing the existing well cementation equipment without changing the existing well cementation process. Along with the gradual rise of the downhole temperature, when the temperature control condition is reached, the shape memory function is triggered, and the volume is expanded. The apparent volume can be increased. And by applying the volume effect, the loss of cement paste from the rock gap is prevented, and the efficient plugging of the rock gap is realized. Meets the requirements of high-efficiency well cementation process, and simultaneously increases the toughness, strength and service life of the set cement.
It is an object of the present invention to provide a thermally induced expander.
The thermally induced expander comprises a compression spring and shape memory resin coated by the compression spring;
the content of the shape memory resin in the thermotropic expander is 5-80%, preferably 35-50%;
the shape memory resin is thermally sensitive resin, and the crystallization phase transition temperature of the shape memory resin is 50-150 ℃; preferably 60-120 ℃; more preferably 70 to 110 ℃.
The shape memory resin is preferably one or a combination of polyethylene, polypropylene, polyurethane, polyacrylate and EVA; more preferred are polyurethane, nylon, and polyethylene, and particularly preferred are polyurethane and EVA.
The compression spring is made of metal; preferably iron, steel, stainless steel, aluminum, copper or zinc; more preferably steel, stainless steel or copper, and particularly preferably steel or stainless steel.
The diameter of the metal spring wire is 0.05-10 mm; preferably 0.2mm to 0.6 mm; more preferably 0.3mm to 0.5 mm;
the inner diameter of the spring is 0.1 mm-50 mm; preferably 0.2mm to 2.5 mm; more preferably 0.4mm to 1.0 mm;
the outer diameter of the spring is 0.5 mm-100 mm; preferably 0.5mm to 4.0 mm; more preferably 0.5mm to 1.0 mm;
the free-state length of the spring is 0.5 mm-1000 mm; preferably 3mm to 30 mm; more preferably 5mm to 15 mm;
the compressed length of the spring is 0.1 mm-20 mm; preferably 0.5mm to 10 mm; more preferably 0.8mm to 1.5 mm.
The second purpose of the invention is to provide a method for preparing a thermal expander.
The method comprises the following steps:
the thermally induced expander is manufactured by coating a molten thermally induced shape memory resin on a metal spring compressed by a jig, and then cooling and shaping.
Wherein,
the compressed length of the metal spring is 10-90% of the free length; preferably 20-70%; more preferably 40-70%;
the melting temperature of the shape memory resin is 70-180 ℃; preferably 90-150 ℃; more preferably 90 ℃ to 130 ℃;
the cooling temperature is-70 ℃ to 80 ℃; preferably-15 ℃ to 30 ℃; more preferably from 0 ℃ to 20 ℃.
The method specifically comprises the following steps:
cleaning a compression spring, compressing and fixing the compression spring by using a clamp, heating and melting shape memory resin, coating the shape memory resin on the surface of the spring in a rolling way, cooling and shaping a product, and trimming and checking the product.
The invention can adopt the following technical scheme:
an intelligent thermal expansion device can increase the apparent volume under the condition of temperature control. The intelligent device can change the composition of the well cementation cement slurry, and part of gravel is replaced. The intelligent thermally-induced expansion device consists of two parts, namely a spring (1) and a shape memory resin (2) coating layer. The spring expansion device with the temperature control shape memory function is mixed into well cementation cement in a compressed state and can be conveniently conveyed to a proper position in a well along with cement slurry. Along with the gradual rise of the downhole temperature, when the temperature control condition is reached, the shape memory function is triggered, and the volume is expanded. The apparent volume can be increased. And by applying the volume effect, the loss of cement paste from the rock gap is prevented, and the efficient plugging of the rock gap is realized. Meets the requirements of high-efficiency well cementation process, and simultaneously increases the toughness, strength and service life of the set cement.
An intelligent thermally-induced expansion device and a preparation process thereof are characterized in that a wire of a compression spring (1) is made of metal materials including but not limited to iron, steel, stainless steel, aluminum, copper, zinc and the like. Among them, steel, stainless steel and copper are preferable, and steel and stainless steel are particularly preferable.
An intelligent thermal expansion device and a preparation process thereof are characterized in that a shape memory polymer material (2) is an artificial synthetic material, including but not limited to polyethylene, polypropylene, polyurethane, polyacrylate, EVA (ethylene-vinyl acetate copolymer) EVA, preferably polyurethane, nylon and polyethylene, particularly preferably polyurethane and EVA.
An intelligent thermally-induced expansion device and a preparation process thereof are characterized in that the SMPS (2) content in the intelligent thermally-induced expansion device accounts for 5% -10%, 10% -15%, 15% -20%, 20% -25%, 25% -30%, 30% -35%, 35% -40%, 45% -50%, 50% -55%, 55% -60%, 60% -65%, 65% -70%, 70% -75%, 75% -80%, particularly preferably 35% -40%, 40% -45% and 45% -50% of the weight of the device.
An intelligent thermal expansion device and a preparation process thereof are characterized in that the diameter (d) of a metal wire of a metal spring wire (1) is 0.05 mm-0.1 mm, 0.1 mm-0.5 mm, 0.5 mm-1.0 mm, 1.0 mm-1.5 mm, 1.5 mm-2.0 mm, 2.0 mm-3.0 mm, 3.0 mm-4.0 mm, 4.0 mm-5.0 mm, 5.0 mm-6.0 mm, 6.0 mm-7.0 mm, 7.0 mm-8.0 mm, 8.0 mm-9.0 mm, 9.0 mm-10.0 mm, preferably 0.2 mm-0.3 mm, 0.3 mm-0.4 mm, 0.4 mm-0.5 mm, 0.5 mm-0.6 mm, particularly preferably 0.3 mm-0.4 mm, 0.5 mm.
An intelligent thermally induced expansion device and a preparation process thereof are characterized in that the size (inner diameter D1) of an inner ring of a spring is 0.1-0.2 mm, 0.2-0.4 mm, 0.4-0.6 mm, 0.6-0.8 mm, 0.8-1.0 mm, 1.0-1.5 mm, 1.5-2.0 mm, 2.0-2.5 mm, 2.5-3.0 mm, 3.0-3.5 mm, 3.5-4.0 mm, 4.0-5.0 mm, 5.0-10 mm, 10-20 mm, 20-30 mm, 30-40 mm, 40-50 mm, preferably 0.2-0.4 mm, 0.4-0.6 mm, 0.6-0.8 mm, 0.8-1.0 mm, 1.5-0.5 mm, 0.9-0.8 mm, 0-0.9-0.5 mm, 0.0-0.5 mm, and particularly 0.0-0 mm.
An intelligent thermally induced expansion device and a preparation process thereof, and is characterized in that the size (D2) of an external ring of a spring is 0.5-0.6 mm, 0.6-0.7 mm, 0.7-0.8 mm, 0.8-0.9 mm, 0.9-1.0 mm, 1.0-1.1 mm, 1.1-1.2 mm, 1.2-1.3 mm, 1.3-1.4 mm, 1.4-1.5 mm, 1.5-2.0 mm, 2.0-2.5 mm, 2.5-3.0 mm, 3.0-3.5 mm, 3.5-4.0 mm, 4.0-5.0 mm, 5.0-10 mm, 10-20 mm, 20-30 mm, 30-40 mm, 40-50 mm, 50-60 mm, 70-0.0 mm, 1.0-5 mm, 1.0-1.0 mm, 1-1.0 mm, 1.0-1.0 mm, 1.5mm, 1.0-1.0 mm, 1-1.0 mm, 1.5mm, 1.0-1-0 mm, 1.0mm, 1-0 mm, 1.0mm, 1-0 mm, 1, 1.5mm to 2.0mm, particularly preferably 0.5mm to 0.6mm, 0.6mm to 0.7mm, 0.7mm to 0.8mm, 0.8mm to 0.9mm, 0.9mm to 1.0 mm.
An intelligent thermal expansion device and a preparation process thereof are characterized in that the free height (Hf) of a spring is 0.5-1 mm, 1-2 mm, 2-3 mm, 3-4 mm, 4-5 mm, 5-6 mm, 6-7 mm, 7-8 mm, 8-10 mm, 10-15 mm, 15-30 mm, 30-50 mm, 50-70 mm, 70-100 mm, 100-150 mm, 150-200 mm, 200-300 mm, 300-400 mm, 400-500 mm, 500-600 mm, 600-700 mm, 700-800 mm, 800-1000 mm, preferably 3-4 mm, 4-5 mm, 5-6 mm, 6-7 mm, 7-8 mm, 8-10 mm, 10-15 mm, 15-30 mm, particularly preferably 5mm to 6mm, 6mm to 7mm, 7mm to 8mm, 8mm to 10mm, 10mm to 15 mm.
An intelligent thermotropic expansion device and a preparation process thereof are characterized in that the coils of a metal spring are connected into a whole through shape memory resin in a compression state, the metal spring is in a compression state by virtue of resin bonding, and the length (Hp) of the metal spring in the compression state is 0.1-0.1 mm, 0.5-1 mm, 1-2 mm, 2-3 mm, 3-4 mm, 4-5 mm, 5-6 mm, 6-7 mm, 7-8 mm, 8-10 mm, 10-12 mm, 12-14 mm, 14-16 mm, 16-18 mm, 18-20 mm, preferably 0.5-1 mm, 1-2 mm, 2-3 mm, 3-4 mm, 4-5 mm, 5-6 mm, 6-7 mm, 7-8 mm, 8-10 mm, particularly preferably 0.8-1 mm, 1.2mm, 1.3mm, 1.5mm, 1-1.5 mm, 1.1-1 mm, and 1.3-1.5 mm.
An intelligent thermal expansion device and a preparation process thereof are characterized in that SMP (2) is thermal sensitive resin, the crystallization phase transition temperature of the material is 50-60 ℃, 60-70 ℃, 70-80 ℃, 80-90 ℃, 90-100 ℃, 100-110 ℃, 110-120 ℃, 120-130 ℃, 130-140 ℃, 140-150 ℃, preferably 60-70 ℃, 70-80 ℃, 80-90 ℃, 90-100 ℃, 100-110 ℃, 110-120 ℃, particularly preferably 70-80 ℃, 80-90 ℃, 90-100 ℃ and 100-110 ℃.
An intelligent thermal expansion device and a preparation process thereof are characterized in that the intelligent thermal expansion device is prepared by adopting the following steps. The first step compresses the metal spring (1) with a fixture and the second step applies molten thermotropic shape memory resin (2) (SMP). And thirdly, cooling and shaping.
An intelligent thermally-induced expansion device and a preparation process are characterized in that the compressed length of a compression spring (1) is 10% -20%, 20% -30%, 30% -40%, 40% -50%, 50% -60%, 60% -70%, 70% -80%, 80% -90%, preferably 20% -30%, 30% -40%, 40% -50%, 50% -60%, 60% -70%, particularly preferably 40% -50%, 50% -60%, 60% -70% of the free length.
An intelligent thermal expansion device and a preparation process thereof are characterized in that the melting temperature of SMP (2) is 70-80 ℃, 80-90 ℃, 90-100 ℃, 100-110 ℃, 110-120 ℃, 120-130 ℃, 130-140 ℃, 140-150 ℃, 150-160 ℃, 160-170 ℃, 170-180 ℃, preferably 90-100 ℃, 100-110 ℃, 110-120 ℃, 120-130 ℃, 130-140 ℃, 140-150 ℃, particularly preferably 90-100 ℃, 100-110 ℃, 110-120 ℃ and 120-130 ℃.
An intelligent thermally induced expansion device and its preparing process features that its cooling temp is-70-80 deg.C, preferably-15-0 deg.C, 0-10 deg.C, 10-20 deg.C, 20-30 deg.C, more preferably 0-5 deg.C, 5-10 deg.C, 10-15 deg.C and 15-20 deg.C.
When the thermally-induced expansion device is in a ground compression state, the volume can be controlled to be 1mm3After the underground temperature is started, the volume can be increased by more than 10 times, the volume steric effect is generated, and the plugging effect is good. The metal spring wire is solidified in the cement stone, so that the toughness and the strength can be effectively improved. Earlier stage scientific research verifies that the principle is feasible, has good shutoff effect.
Drawings
FIG. 1 is a schematic cross-sectional view of a thermally induced expander of the present invention after expansion;
FIG. 2 is a schematic cross-sectional view of the thermally induced expander of the present invention;
description of reference numerals:
1-compression spring wire; 2-shape memory resin.
Detailed Description
The present invention will be further described with reference to the following examples.
TABLE 1
Example 1
The diameter of the metal wire of the metal spring 1 is 0.05 mm; the inner diameter of the spring is 0.1 mm; the outer diameter of the spring is 0.5 mm; the free-state length of the spring is 0.5 mm; the length in the compressed state is 0.1 mm. The weight of the shape memory resin 1 is 5% of the total weight; the crystallization phase transition temperature (thermotropic temperature) of the shape memory resin was 50 ℃.
The first step compresses the metal spring 1 using a jig, and the second step coats a thermotropic shape memory resin 1(SMP) melted at 70 ℃. And thirdly, cooling to 70 ℃ for shaping. A thermally induced expander T1 (see table 1) was obtained.
Example 2
The diameter of the metal wire of the metal spring 2 is 0.2 mm; the inner diameter of the spring is 3 mm; the outer diameter of the spring is 4 mm; the free-state length of the spring is 15 mm; the length in the compressed state is 3 mm. The weight of the shape memory resin 2 is 30% of the total weight; the crystallization phase transition temperature (thermotropic temperature) of the shape memory resin was 70 ℃.
The first step compresses the metal spring 2 using a jig, and the second step coats a thermotropic shape memory resin 2(SMP) melted at 130 ℃. And thirdly, cooling to 0 ℃ for shaping. A thermally induced expander T2 (see table 1) was obtained.
Example 3
The diameter of the metal wire of the metal spring 3 is 0.2 mm; the inner diameter of the spring is 10 mm; the outer diameter of the spring is 100 mm; the free-state length of the spring is 1000 mm; the length in the compressed state is 20 mm. The weight of the shape memory resin 3 is 80% of the total weight; the crystalline phase transition temperature (thermotropic temperature) of the shape memory resin was 75 ℃.
The first step compresses the metal spring 3 using a jig, and the second step coats a thermotropic shape memory resin 3(SMP) melted at 130 ℃. And thirdly, cooling to 0 ℃ for shaping. A thermally induced expander T3 (see table 1) was obtained.
Example 4
The diameter of the metal wire of the metal spring 4 is 1 mm; the inner diameter of the spring is 1.5 mm; the outer diameter of the spring is 2 mm; the free-state length of the spring is 20 mm; the length in the compressed state is 5 mm. The weight of the shape memory resin 4 is 30% of the total weight; the crystallization phase transition temperature (thermotropic temperature) of the shape memory resin was 90 ℃.
The first step compresses the metal spring 4 using a jig, and the second step coats a thermotropic shape memory resin 4(SMP) melted at 130 ℃. And thirdly, cooling to 5 ℃ for shaping. A thermally induced expander T4 (see table 1) was obtained.
Example 5
The diameter of the metal wire of the metal spring 5 is 0.2 mm; the inner diameter of the spring is 1 mm; the outer diameter of the spring is 1.4 mm; the free-state length of the spring is 30 mm; the length in the compressed state is 6 mm. The weight of the shape memory resin 5 is 25% of the total weight; the crystallization phase transition temperature (thermotropic temperature) of the shape memory resin was 120 ℃.
The first step compresses the metal spring 5 using a jig, and the second step coats a thermotropic shape memory resin 5(SMP) melted at 130 ℃. And thirdly, cooling to 10 ℃ for shaping. A thermally induced expander T5 (see table 1) was obtained.
Example 6
The wire diameter of the metal spring 6 is 10 mm; the inner diameter of the spring is 1.5 mm; the outer diameter of the spring is 2 mm; the free-state length of the spring is 50 mm; the length in the compressed state is 10 mm. The weight of the shape memory resin 6 is 25% of the total weight; the crystallization phase transition temperature (thermotropic temperature) of the shape memory resin was 150 ℃.
The first step compresses the metal spring 6 using a jig, and the second step coats a 180 deg.c molten thermotropic shape memory resin 6 (SMP). And thirdly, cooling to 80 ℃ for shaping. A thermally induced expander T6 (see table 1) was obtained.
Claims (10)
1. A thermally induced expander, characterized by:
the thermally induced expander comprises a compression spring and shape memory resin coated by the compression spring;
the content of the shape memory resin in the thermal expansion device is 5 to 80 percent;
the shape memory resin is heat sensitive resin, and the crystallization phase transition temperature of the shape memory resin is 50-150 ℃.
2. The thermally induced expander of claim 1 wherein:
the crystallization phase transition temperature of the shape memory resin is 60-120 ℃;
the content of the shape memory resin in the thermotropic expander is 35-50%.
3. The thermally induced expander of claim 2 wherein:
the crystallization phase transition temperature of the shape memory resin is 70-110 ℃.
4. The thermally induced expander of claim 1 wherein:
the shape memory resin is one or a combination of polyethylene, polypropylene, polyurethane, polyacrylate and EVA.
5. The thermally induced expander of claim 1 wherein:
the compression spring is made of metal; the diameter of the metal spring wire is 0.05-10 mm;
the inner diameter of the spring is 0.1 mm-50 mm; the outer diameter of the spring is 0.5 mm-100 mm;
the free-state length of the spring is 0.5 mm-1000 mm; the compressed length of the spring is 0.1 mm-20 mm.
6. The thermally induced expander of claim 5 wherein:
the compression spring is made of iron, steel, stainless steel, aluminum, copper or zinc;
the diameter of the metal spring wire is 0.2 mm-0.6 mm;
the inner diameter of the spring is 0.2 mm-2.5 mm; the outer diameter of the spring is 0.5 mm-4 mm;
the free-state length of the spring is 3 mm-30 mm; the compressed length of the spring is 0.5 mm-10 mm.
7. The thermally induced expander of claim 6 wherein:
the diameter of the metal spring wire is 0.3 mm-0.5 mm;
the inner diameter of the spring is 0.4 mm-1.0 mm; the outer diameter of the spring is 0.5 mm-1.0 mm;
the free-state length of the spring is 5 mm-15 mm; the compressed length of the spring is 0.8 mm-1.5 mm.
8. A method of producing a thermally induced expander as claimed in any one of claims 1 to 7 characterised in that the method comprises:
the thermally induced expander is manufactured by coating a molten shape memory resin on a metal spring compressed by a jig, and then cooling and shaping.
9. The method of manufacturing a thermally-induced expander as claimed in claim 8, wherein:
the compressed length of the metal spring is 10-90% of the free length;
the melting temperature of the shape memory resin is 70-180 ℃;
the cooling temperature is-70 ℃ to 80 ℃.
10. The method of making a thermally-induced expander as claimed in claim 9, wherein:
the compressed length of the metal spring is 20-70% of the free length;
the melting temperature of the shape memory resin is 90-150 ℃;
the cooling temperature is-15 ℃ to 30 ℃.
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