CN115654052B - Compression type tubular shape memory composite structure and manufacturing method thereof - Google Patents
Compression type tubular shape memory composite structure and manufacturing method thereof Download PDFInfo
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Abstract
A compressed tubular shape memory composite structure comprising: the tubular knitting reinforcement comprises a tubular knitting structure formed by weft flat needle tubular fabrics and spiral reinforcement fibers, and a tubular shape memory polymer package which is filled in gaps inside the hybrid fabric reinforcement and is wrapped on the inner circumferential surface and the outer circumferential surface of the hybrid fabric reinforcement. The manufacturing process comprises the steps of braiding, pretreatment, glue injection, heating solidification and demoulding. The design not only can improve the restoring force of the tubular shape memory composite structure, but also has good material shape fixing rate and shape restoring rate.
Description
Technical Field
The invention relates to a compression type tubular shape memory composite structure and a manufacturing method thereof, which are particularly suitable for optimizing the manufacturing process and improving the compression recovery rate and the recovery force of the tubular shape memory composite structure.
Background
Along with the development and wide application of intelligent materials and structures, shape memory polymers become research hot spots, but the shape memory polymers have the defects of low modulus, poor strength, small restoring force and the like. Although the shape memory composite material overcomes the defects, the shape memory composite material with special structures such as a tube shape, a honeycomb shape and the like is difficult to integrally form and prepare, and the application range of the shape memory composite material is greatly limited.
The prior shape memory composite material patents include: the preparation method of the shape memory composite material disclosed in CN 104589672A is characterized in that the prepared shape memory composite material is generally a plate and has very limited application range. The existing special structure shape memory composite material patents include: CN103438090a discloses a tubular shape memory composite hinge formed by bonding two pieces of thin shell composite material which are approximately semicircular; CN112298613a discloses a composite pod rod based on shape memory composite material controlled folding and unfolding, which is prepared by bonding two approximately semicircular thin-shell materials and bonding discrete shape memory composite material sheets on the outer surface. The tubular shape memory composite material is prepared by bonding a plurality of parts, is not integrally formed, and has complex preparation process and long flow.
Therefore, how to integrally prepare a tubular high-performance shape memory composite material is a technical problem to be solved.
Disclosure of Invention
The invention aims to solve the problems of low modulus, poor strength and small restoring force of memory polymers in the prior art, and provides an integrally formed compression type tubular shape memory composite structure for improving strength, modulus and restoring force and a manufacturing method thereof.
In order to achieve the above object, the technical solution of the present invention is:
a compressed tubular shape memory composite structure, the composite structure comprising: the tubular knitting reinforcement is in a tubular knitted fabric structure, the shape memory polymer bag is filled in gaps inside the tubular knitting reinforcement, and meanwhile, the shape memory polymer bag is wrapped on the inner circumferential surface and the outer circumferential surface of the tubular knitting reinforcement.
The tubular knitted reinforcement includes: a tubular weft jersey knitted fabric, which is a tubular fabric knitted in weft jersey mode using a flat knitting machine.
The tubular knitted reinforcement further comprises: the spiral reinforcing fibers are inserted into the tubular weft jersey knit fabric in a spiral mode.
The tubular knitted reinforcement has a lateral knitting density of 15-25 needles/5 cm and the tubular knitted reinforcement has a longitudinal knitting density of 15-25 needles/5 cm.
The tubular knitted reinforcement is made of fibers with tensile strength of more than 2000 MPa;
the shape memory polymeric bag is made of shape memory high polymer materials.
The tubular knitted reinforcement includes: the tubular weft jersey is made of 60-400 tex glass fiber, carbon fiber or basalt fiber;
the spiral reinforced fiber is made of 60-240 tex glass fiber, carbon fiber, stainless steel fiber or basalt fiber;
the shape memory polymeric bag is made by vacuum negative pressure pouring of shape memory epoxy resin, shape memory polystyrene or shape memory polyimide in a mould.
A method of manufacturing a compressed tubular shape memory composite structure, the method of manufacturing being based on a forming die comprising: the outer sleeve is coaxially sleeved outside the inner sleeve seat, the bottom of the outer sleeve is matched with the bottom plate of the inner sleeve seat, and the ring cover is sleeved on the inner sleeve seat and matched with the top of the outer sleeve; at least two shape memory material injection ports are formed in the bottom plate of the inner sleeve seat, and at least two exhaust overflow ports are formed in the ring cover;
the manufacturing method comprises the following steps:
step one, knitting, namely adjusting parameters of a needle lifting triangle on a flat knitting machine so as to adjust the transverse knitting density, the longitudinal knitting density and the knitting shape of the knitting, and weaving tubular weft plain knitted fabrics on the flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa to obtain tubular knitting reinforcement matched with a forming die;
step two, pretreatment, namely uniformly smearing a release agent on an inner sleeve seat, an outer sleeve and a ring cover, sleeving the outer sleeve on the inner sleeve seat to enable the inner sleeve seat and the outer sleeve to be coaxial, then externally bonding the outer sleeve on the inner sleeve seat by adopting high-temperature glue to enable the joint of the inner sleeve seat and the outer sleeve to be sealed, putting the knitted tubular knitting reinforcement into an annular groove between the inner sleeve seat and the outer sleeve, covering the ring cover on the outer sleeve, and externally bonding gaps between the ring cover and the inner sleeve seat and between the ring cover and the outer sleeve by adopting high-temperature glue to enable the joint between the ring cover and the inner sleeve seat and between the ring cover to be sealed;
step three, injecting glue, namely connecting the molding die assembled in the step two with a shape memory polymer injection device, and injecting the shape memory polymer into the molding die in a negative pressure environment of 0.01-0.1 MPa until the shape memory polymer overflowed from an exhaust overflow port is uniform and no bubbles exist, so that the glue injection is completed;
step four, heating and solidifying, namely placing the molding die after glue injection into an oven, firstly preserving heat for 2-3 hours at the temperature of 90-110 ℃, then preserving heat for 8-10 hours at the temperature of 120-150 ℃, and finally naturally cooling to room temperature in the normal temperature environment, wherein the solidification is completed;
and fifthly, demolding, namely removing the high-temperature glue on the surface of the cured forming die, and sequentially removing the outer sleeve and the inner sleeve of the ring cover to obtain the tubular shape memory composite structure.
In the first step, weaving, tubular weft plain knitted fabric is woven on a flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa, and simultaneously, spiral reinforcing fibers are woven into the tubular weft plain knitted fabric by adopting a yarn-lining tissue weaving process in the weaving process and are spirally arranged to obtain a tubular knitting reinforcement matched with a forming die.
Compared with the prior art, the invention has the beneficial effects that:
1. the tubular knitted fabric is compounded in the shape memory material in the compression type tubular shape memory composite structure, has good deformability, improves the restoring force, modulus and strength of the tubular shape memory composite structure by utilizing the strength of the fiber knitted body, and optimizes the performance of the tubular shape memory composite structure. Therefore, the design can improve the restoring force of the tubular shape memory composite structure and optimize the performance of the tubular shape memory composite structure.
2. The tubular knitted fabric is compounded in the shape memory material in the compression type tubular shape memory composite structure, and the tubular weft knitted fabric has good deformability and small deformation difficulty, so that the recovery rate of the tubular shape memory composite structure can be improved, and the recovery time is shortened.
3. The compressive tubular shape memory composite structure adopts the spiral reinforcing fiber to further enhance and improve the restoring force of the tubular shape memory composite structure, and the spiral reinforcing fiber can promote the restoring force of the tubular shape to more than 7 times of that of the pure shape memory polymer material, so that the application field of the shape memory composite material is enlarged. Therefore, the restoring force of the tubular shape memory composite structure is further enhanced and improved through the spiral reinforcing fiber, and the mechanical property of the tubular shape memory composite structure is further optimized.
4. According to the manufacturing method of the compression type tubular shape memory composite structure, the tubular weft knitted fabric is integrally knitted by using the flat knitting machine, then the tubular shape memory composite structure is manufactured by using the die, and finally the tubular shape memory composite structure is cured and shaped by using the oven for heat treatment, so that the manufacturing process is simple and reasonable, the memory structure is integrally formed, and the improvement of the mechanical property of the structure is facilitated. Therefore, the design and manufacturing flow is reasonable in design, and is beneficial to improving the mechanical property of the structure.
5. The manufacturing method of the compressed tubular shape memory composite structure integrally prepares the tubular knitted fabric reinforcing material containing the spiral reinforcing fibers by adopting a knitting technology and a yarn-lining tissue knitting technology, and further cures the tubular knitted fabric reinforcing material and the shape memory polymer material into a composite material. The tubular weft knitted fabric has better deformability, the spiral reinforcing fiber can promote the recovery of the tubular shape, the shape fixing rate of the tubular shape memory composite material can reach more than 98%, the shape recovery rate can reach more than 98%, the recovery force can reach more than 7 times of that of a pure shape memory polymer material, and the application field of the shape memory composite material is widened.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic representation of the compression state of the present invention.
Fig. 3 is a schematic structural view of a molding die in the manufacturing method of the present invention.
FIG. 4 is a schematic representation of the variation of the test sample tested in the examples of the present invention.
In the figure: the tubular knitting reinforcement 1, the tubular weft jersey 11, the spiral reinforcement fiber 12, the tubular shape memory polymer bag 2, the forming die 3, the inner sleeve seat 31, the outer sleeve 32, the ring cover 33, the shape memory material injection port 34 and the exhaust overflow port 35.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1-3, a compressed tubular shape memory composite structure, the composite structure comprising: the tubular knitting reinforcement 1 is in a tubular knitted fabric structure, the shape memory polymer bag 2 is filled in a gap inside the tubular knitting reinforcement 1, and the shape memory polymer bag 2 is wrapped on the inner circumferential surface and the outer circumferential surface of the tubular knitting reinforcement 1.
The tubular knitted reinforcement 1 comprises: a tubular knitted fabric 11, wherein the tubular knitted fabric 11 is a tubular fabric knitted by a weft plain method using a flat knitting machine.
The tubular knitted reinforcement 1 further comprises: the spiral reinforcing fibers 12 are inserted into the tubular weft jersey 11 in a spiral manner.
The tubular knitted reinforcement 1 has a lateral knitting density of 15-25 needles/5 cm and the tubular knitted reinforcement 1 has a longitudinal knitting density of 15-25 needles/5 cm.
The tubular knitted reinforcing body 1 is made of fibers with tensile strength of more than 2000 MPa;
the shape memory polymeric bag 2 is made of shape memory polymer material.
The tubular knitted reinforcement 1 comprises: the tubular weft jersey fabric 11 and spiral reinforced fibers 12, wherein the tubular weft jersey fabric 11 is made of 60-400 tex glass fibers, carbon fibers or basalt fibers;
the spiral reinforced fiber 12 is made of 60-240 tex glass fiber, carbon fiber, stainless steel fiber or basalt fiber;
the shape memory polymeric bag 2 is made of shape memory epoxy resin, shape memory polystyrene or shape memory polyimide through vacuum negative pressure pouring in a mould.
A method of manufacturing a compressed tubular shape memory composite structure, the method of manufacturing being based on a forming die 3, the forming die 3 comprising: the inner sleeve seat 31, the outer sleeve 32 and the ring cover 33, wherein the outer sleeve 32 is coaxially sleeved outside the inner sleeve seat 31, the bottom of the outer sleeve 32 is matched with the bottom plate of the inner sleeve seat 31, and the ring cover 33 is sleeved on the inner sleeve seat 31 and is matched with the top of the outer sleeve 32; at least two shape memory material injection ports 34 are formed in the bottom plate of the inner sleeve seat 31, and at least two exhaust overflow ports 35 are formed in the ring cover 33;
the manufacturing method comprises the following steps:
step one, knitting, namely, adjusting parameters of a needle lifting triangle on a flat knitting machine so as to adjust the transverse knitting density, the longitudinal knitting density and the knitting shape of the knitting, and weaving tubular weft flat knitted fabric 11 on the flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa to obtain tubular knitting reinforcement 1 matched with a forming die 3;
step two, pretreatment, namely uniformly smearing a release agent on the inner sleeve seat 31, the outer sleeve 32 and the ring cover 33, sleeving the outer sleeve 32 on the inner sleeve seat 31 to enable the inner sleeve seat 31 and the outer sleeve 32 to be coaxial, then externally bonding the outer sleeve 32 on the inner sleeve seat 31 by adopting high-temperature glue to seal the joint of the inner sleeve seat 31 and the outer sleeve 32, placing the knitted tubular knitted reinforcement 1 into an annular groove between the inner sleeve seat 31 and the outer sleeve 32, covering the ring cover 33 on the outer sleeve 32, and externally bonding gaps between the ring cover 33 and the inner sleeve seat 31 and the outer sleeve 32 by adopting high-temperature glue to seal the joint between the ring cover 33 and the inner sleeve seat 31 and the outer sleeve 32;
step three, injecting glue, namely connecting the forming die 3 assembled in the step two with a shape memory polymer injection device, and injecting the shape memory polymer into the forming die 3 in a negative pressure environment of 0.01-0.1 MPa until the shape memory polymer overflowed from the exhaust overflow port 35 is uniform and no bubble exists, so that the glue injection is completed;
step four, heating and solidifying, namely placing the molding die 3 with the glue injection in an oven, firstly preserving heat for 2-3 hours at the temperature of 90-110 ℃, then preserving heat for 8-10 hours at the temperature of 120-150 ℃, and finally naturally cooling to room temperature in the normal temperature environment, wherein the solidification is completed;
and fifthly, demolding, namely removing the high-temperature glue on the surface of the cured forming die 3, and then sequentially removing the ring cover 33, the outer sleeve 32 and the inner sleeve seat 31 to obtain the tubular shape memory composite structure.
In the first step, the tubular weft jersey 11 is woven on a flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa, and simultaneously, the spiral reinforcing fibers 12 are woven into the tubular weft jersey 11 by adopting a yarn-lining tissue weaving process in the weaving process and are spirally arranged, so that the tubular knitting reinforcement 1 matched with the forming die 3 is obtained.
The principle of the invention is explained as follows:
the invention combines tubular knitted fabrics in a shape memory material, and weaves the tubular knitted fabrics into knitted fabrics by selecting high-strength fibers: the tubular weft jersey 11 and the spiral reinforcement structure of the spiral reinforcement fibers 12 effectively increase the restoring force of the shape memory material and effectively improve the mechanical properties of the shape memory material.
Example 1:
a compressed tubular shape memory composite structure, the composite structure comprising: the tubular knitting reinforcement 1 is in a tubular knitted fabric structure, the shape memory polymer bag 2 is filled in a gap inside the tubular knitting reinforcement 1, and the shape memory polymer bag 2 is wrapped on the inner circumferential surface and the outer circumferential surface of the tubular knitting reinforcement 1.
The tubular knitted reinforcement 1 comprises: a tubular knitted fabric 11, wherein the tubular knitted fabric 11 is a tubular fabric knitted by a weft plain method using a flat knitting machine.
The tubular knitted reinforcement 1 has a lateral knitting density of 15-25 needles/5 cm and the tubular knitted reinforcement 1 has a longitudinal knitting density of 15-25 needles/5 cm.
The tubular knitted reinforcing body 1 is made of fibers with tensile strength of more than 2000 MPa;
the shape memory polymeric bag 2 is made of shape memory polymer material.
The tubular weft jersey 11 is made of 60-400 tex glass fiber, carbon fiber or basalt fiber;
the shape memory polymeric bag 2 is made of shape memory epoxy resin, shape memory polystyrene or shape memory polyimide through vacuum negative pressure pouring in a mould.
A method of manufacturing a compressed tubular shape memory composite structure, the method of manufacturing being based on a forming die 3, the forming die 3 comprising: the inner sleeve seat 31, the outer sleeve 32 and the ring cover 33, wherein the outer sleeve 32 is coaxially sleeved outside the inner sleeve seat 31, the bottom of the outer sleeve 32 is matched with the bottom plate of the inner sleeve seat 31, and the ring cover 33 is sleeved on the inner sleeve seat 31 and is matched with the top of the outer sleeve 32; at least two shape memory material injection ports 34 are formed in the bottom plate of the inner sleeve seat 31, and at least two exhaust overflow ports 35 are formed in the ring cover 33;
the manufacturing method comprises the following steps:
step one, knitting, namely, adjusting parameters of a needle lifting triangle on a flat knitting machine so as to adjust the transverse knitting density, the longitudinal knitting density and the knitting shape of the knitting, and weaving tubular weft flat knitted fabric 11 on the flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa to obtain tubular knitting reinforcement 1 matched with a forming die 3;
step two, pretreatment, namely uniformly smearing a release agent on the inner sleeve seat 31, the outer sleeve 32 and the ring cover 33, sleeving the outer sleeve 32 on the inner sleeve seat 31 to enable the inner sleeve seat 31 and the outer sleeve 32 to be coaxial, then externally bonding the outer sleeve 32 on the inner sleeve seat 31 by adopting high-temperature glue to seal the joint of the inner sleeve seat 31 and the outer sleeve 32, placing the knitted tubular knitted reinforcement 1 into an annular groove between the inner sleeve seat 31 and the outer sleeve 32, covering the ring cover 33 on the outer sleeve 32, and externally bonding gaps between the ring cover 33 and the inner sleeve seat 31 and the outer sleeve 32 by adopting high-temperature glue to seal the joint between the ring cover 33 and the inner sleeve seat 31 and the outer sleeve 32;
step three, injecting glue, namely connecting the forming die 3 assembled in the step two with a shape memory polymer injection device, and injecting the shape memory polymer into the forming die 3 in a negative pressure environment of 0.01-0.1 MPa until the shape memory polymer overflowed from the exhaust overflow port 35 is uniform and no bubble exists, so that the glue injection is completed;
step four, heating and solidifying, namely placing the molding die 3 with the glue injection in an oven, firstly preserving heat for 2-3 hours at the temperature of 90-110 ℃, then preserving heat for 8-10 hours at the temperature of 120-150 ℃, and finally naturally cooling to room temperature in the normal temperature environment, wherein the solidification is completed;
and fifthly, demolding, namely removing the high-temperature glue on the surface of the cured forming die 3, and then sequentially removing the ring cover 33, the outer sleeve 32 and the inner sleeve seat 31 to obtain the tubular shape memory composite structure.
Example 2:
example 2 is substantially the same as example 1 except that:
the tubular knitted reinforcement 1 further comprises: the spiral reinforcing fibers 12 are inserted into the tubular weft jersey 11 in a spiral manner.
The spiral reinforced fiber 12 is made of 60-240 tex glass fiber, carbon fiber, stainless steel fiber or basalt fiber.
In the first step, the tubular weft jersey 11 is woven on a flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa, and simultaneously, the spiral reinforcing fibers 12 are woven into the tubular weft jersey 11 by adopting a yarn-lining tissue weaving process in the weaving process and are spirally arranged, so that the tubular knitting reinforcement 1 matched with the forming die 3 is obtained.
Example 3:
example 3 is substantially the same as example 2 except that:
in the first step, weaving, adopting 198tex glass fiber to weave tubular weft plain knitted fabric 11 on a flat knitting machine, and simultaneously adopting a yarn-lining tissue weaving process in the weaving process, and weaving the 198tex glass fiber into the tubular weft plain knitted fabric 11 to obtain spiral reinforced fiber 12;
in the step three, injecting glue, injecting the shape memory polymer into the forming die 3 in a negative pressure environment of 0.08MPa until the shape memory polymer overflows from the exhaust overflow port 35, and completing the injection of the glue;
in the fourth step, in the heating and curing, the molding die 3 after glue injection is put into an oven, firstly, the temperature is kept for 2 hours at the temperature of 100 ℃, then the temperature is kept for 8 hours at the temperature of 140 ℃, finally, the molding die is naturally cooled to the room temperature in the normal temperature environment, and the curing is completed at the moment. The glass fiber is adopted to prepare the composite material, so that the cost is low.
Example 4:
example 4 is substantially the same as example 3 except that:
in the first step, weaving, 71tex carbon fiber is adopted to weave a tubular weft plain knitted fabric 11 on a flat knitting machine, and simultaneously, a yarn-lining tissue weaving process is adopted in the weaving process, so that the 71tex carbon fiber is woven into the tubular weft plain knitted fabric 11 to obtain a spiral reinforcing fiber 12; the carbon fiber is adopted to prepare the composite material, so that the composite material has the advantages of light weight and high strength.
Example 5:
example 5 is substantially the same as example 3 except that:
in the first step, a tubular weft plain knitted fabric 11 is woven on a flat knitting machine by adopting 71tex carbon fiber, and simultaneously, a lining yarn tissue weaving process is adopted in the weaving process, and 70tex stainless steel fiber is woven into the tubular weft plain knitted fabric 11 to obtain the spiral reinforcing fiber 12.
Example 6:
example 6 is substantially the same as example 2 except that:
in the first step, weaving, 396tex glass fiber is adopted to weave a tubular weft plain knitted fabric 11 on a flat knitting machine, and meanwhile, a yarn-lining tissue weaving process is adopted in the weaving process, and 198tex glass fiber is woven into the tubular weft plain knitted fabric 11 to obtain a spiral reinforcing fiber 12;
in the step three, injecting glue, injecting the shape memory polymer into the forming die 3 in a negative pressure environment of 0.09MPa until the shape memory polymer overflows from the exhaust overflow port 35, and completing the injection of the glue;
in the fourth step, in the heating and curing, the molding die 3 after glue injection is put into an oven, firstly, the temperature is kept for 2 hours at the temperature of 100 ℃, then the temperature is kept for 10 hours at the temperature of 150 ℃, and finally, the molding die is naturally cooled to the room temperature in the normal temperature environment, and the curing is completed at the moment. The glass fiber is used for preparing the composite material, and has the advantages of high fiber volume content and low cost.
Comparative example 1:
in order to prepare the pure shape memory polymer material, the mold release agent is uniformly smeared on the tubular composite material forming mold 3, the tubular composite material forming mold 3 is sealed by high-temperature glue, the mold is fully filled with the shape memory polymer material by using the negative pressure of 0.02MPa, the temperature is kept for 2 hours at 100 ℃ in an oven, and the temperature is kept for 8 hours at 140 ℃ to complete the temperature programming and curing process, so that the pure shape memory polymer material is obtained.
The finished products of example 4 and example 5 and comparative example 1 have the same diameter and thickness, and the test samples of example 4, example 5 and comparative example 1 were cut to a length of 25mm for the following experimental tests:
shape fixation and shape recovery test:
referring to fig. 4, the tubular specimen was compressed by 80% in the radial direction at 100 c, after which the recovery of the specimen was observed in an oven. The experimental steps are as follows:
1) Heating a tubular sample to 100 ℃ by using a universal material experiment machine with a temperature box, wherein the initial ring height of the sample is L 1 ；
2) Compressing the sample by 80%, and the ring height of the sample is L 2 Is a temporary shape of (a);
3) The compression amount of the sample is kept unchanged, the sample is cooled to room temperature, the sample is slightly rebounded, and the ring height of the sample is increased to L 3 ；
4) Placing the cooled sample into a 100 ℃ oven, shooting the recovery process of the sample by using a high-definition camera, and finally recovering the sample ring height to L 4 。
Shape fixation ratio of test piece= (L 1 -L 3 )/(L 1 -L 2 )；
Shape recovery rate of sample= (L 4 -L 3 )/(L 1 -L 3 )。
The shape fixation ratio of the sample of example 4 was 99.6%, the shape recovery ratio was 98.3%, the shape fixation ratio of example 5 was 98.1%, and the shape recovery ratio was 99.5%. The shape fixation rate of the comparative example 1 sample was 99.8% and the shape recovery rate was 99.2%.
Shape recovery force test:
referring to fig. 4, the tubular specimen was compressed by 80% in the radial direction at 100 ℃, after which the restoring force of the specimen was tested in an oven.
1) Heating a tubular sample to 100 ℃ by using a universal material experiment machine with a temperature box, wherein the initial ring height of the sample is L 1 ；
2) Compressing the sample by 80%, and the ring height of the sample is L 2 Is a temporary shape of (a);
3) The compression amount of the sample is kept unchanged, the sample is cooled to room temperature, the sample is slightly rebounded, and the ring height of the sample is increased to L 3 ；
4) And placing the cooled sample on a compression clamp, keeping the displacement of the clamp unchanged, heating the sample in an oven until the sample is subjected to glass transition, and measuring the restoring force of the sample at the moment.
Comparative example 1 the restoring force of the pure shape memory polymeric material was 3.3N, the restoring force of the tubular shape memory composite material of example 4 was 22.5N, the restoring force of the tubular shape memory composite material of example 5 was 25.7N, and the restoring force of the tubular shape memory composite material of the present invention was 7.8 times that of the pure shape memory polymeric material.
The test is completed by adopting an ETM105D microcomputer control electronic universal tester manufactured by Shenzhen universal test experiment equipment limited company.
Claims (7)
1. A manufacturing method of a compression type tubular shape memory composite structure is characterized in that:
the method of manufacturing is for manufacturing a shape memory composite structure comprising: the tubular knitting reinforcement (1) and the tubular shape memory polymer bag (2), wherein the tubular knitting reinforcement (1) is of a tubular knitted fabric structure, the shape memory polymer bag (2) is filled in a gap inside the tubular knitting reinforcement (1), and meanwhile, the shape memory polymer bag (2) is wrapped on the inner circumference surface and the outer circumference surface of the tubular knitting reinforcement (1);
the manufacturing method is based on a forming mold (3), the forming mold (3) comprising: the inner sleeve seat (31), the outer sleeve (32) and the ring cover (33), wherein the outer sleeve (32) is coaxially sleeved outside the inner sleeve seat (31), the bottom of the outer sleeve (32) is matched with the bottom plate of the inner sleeve seat (31), and the ring cover (33) is sleeved on the inner sleeve seat (31) and is matched with the top of the outer sleeve (32); at least two shape memory material injection ports (34) are formed in the bottom plate of the inner sleeve seat (31), and at least two exhaust overflow ports (35) are formed in the ring cover (33);
the manufacturing method comprises the following steps:
step one, knitting, namely adjusting parameters of a needle lifting triangle on a flat knitting machine so as to adjust the transverse knitting density, the longitudinal knitting density and the knitting shape of the knitting, and weaving tubular weft plain knitted fabrics (11) on the flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa to obtain tubular knitting reinforcement (1) matched with a forming die (3);
step two, pretreatment, namely uniformly smearing a release agent on an inner sleeve seat (31), an outer sleeve (32) and a ring cover (33), sleeving the outer sleeve (32) on the inner sleeve seat (31) to enable the inner sleeve seat (31) and the outer sleeve to be coaxial, then adopting high-temperature glue to bond the outer sleeve (32) on the inner sleeve seat (31) from the outside to seal the joint of the inner sleeve seat (31) and the outer sleeve (32), putting the knitted tubular knitted reinforcement (1) into an annular groove between the inner sleeve seat (31) and the outer sleeve (32), covering the ring cover (33) on the outer sleeve (32), and adopting the high-temperature glue to bond a gap between the ring cover (33) and the inner sleeve seat (31) and the outer sleeve (32) from the outside to seal the joint between the ring cover (33) and the inner sleeve seat (31) and the outer sleeve (32);
step three, injecting glue, namely connecting the forming die (3) assembled in the step two with a shape memory polymer injection device, and injecting the shape memory polymer into the forming die (3) in a negative pressure environment of 0.01-0.1 mpa until the shape memory polymer overflows from an exhaust overflow port (35) uniformly and no bubbles exist, so that the glue injection is completed;
step four, heating and solidifying, namely placing the molding die (3) with the glue injection in an oven, firstly preserving heat for 2-3 hours at the temperature of 90-110 ℃, then preserving heat for 8-10 hours at the temperature of 120-150 ℃, and finally naturally cooling to room temperature in the normal temperature environment, wherein the solidification is completed;
and fifthly, demolding, namely removing high-temperature glue on the surface of the cured forming die (3), and sequentially removing the ring cover (33), the outer sleeve (32) and the inner sleeve seat (31) to obtain the tubular shape memory composite structure.
2. The method of manufacturing a compressed tubular shape memory composite structure according to claim 1, wherein:
the tubular knitted reinforcement (1) comprises: a tubular weft jersey (11), wherein the tubular weft jersey (11) is a tubular fabric knitted by weft jersey mode using a flat knitting machine.
3. The method of manufacturing a compressed tubular shape memory composite structure according to claim 2, wherein:
the tubular knitted reinforcement (1) further comprises: and spiral reinforcing fibers (12), wherein the spiral reinforcing fibers (12) are spirally inserted into the tubular weft jersey (11).
4. A method of manufacturing a compressed tubular shape memory composite structure according to claim 1, 2 or 3, wherein:
the tubular knitted reinforcement (1) has a lateral knitting density of 15-25 needles/5 cm and the tubular knitted reinforcement (1) has a longitudinal knitting density of 15-25 needles/5 cm.
5. The method of manufacturing a compressed tubular shape memory composite structure according to claim 4, wherein:
the tubular knitted reinforcement (1) is made of fibers with tensile strength of more than 2000 MPa;
the shape memory polymeric bag (2) is made of shape memory polymer materials.
6. The method of manufacturing a compressed tubular shape memory composite structure according to claim 5, wherein:
the tubular knitted reinforcement (1) comprises: a tubular weft jersey (11) and spiral reinforcing fibers (12), wherein the tubular weft jersey (11) is made of 60-400 tex glass fibers, carbon fibers or basalt fibers;
the spiral reinforced fiber (12) is made of 60-240 tex glass fiber, carbon fiber, stainless steel fiber or basalt fiber;
the shape memory polymeric inclusion (2) is made by vacuum negative pressure pouring of shape memory epoxy resin, shape memory polystyrene or shape memory polyimide in a mould.
7. The method of manufacturing a compressed tubular shape memory composite structure according to claim 1, wherein:
in the first step, weaving, tubular weft plain knitted fabric (11) is woven on a flat knitting machine by adopting fibers with the tensile strength of more than 2000MPa, and simultaneously, spiral reinforcing fibers (12) are woven into the tubular weft plain knitted fabric (11) by adopting a yarn-lining tissue weaving process in the weaving process and are spirally arranged to obtain tubular knitting reinforcement (1) matched with a forming die (3).
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| CN202211274063.7A CN115654052B (en) | 2022-10-18 | 2022-10-18 | Compression type tubular shape memory composite structure and manufacturing method thereof |
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| CN202211274063.7A CN115654052B (en) | 2022-10-18 | 2022-10-18 | Compression type tubular shape memory composite structure and manufacturing method thereof |
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| CN115654052A CN115654052A (en) | 2023-01-31 |
| CN115654052B true CN115654052B (en) | 2023-06-30 |
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