CN109501318B - Special-shaped section bar drawing and pressing process adopting PMI foam sandwich - Google Patents
Special-shaped section bar drawing and pressing process adopting PMI foam sandwich Download PDFInfo
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- CN109501318B CN109501318B CN201811411356.9A CN201811411356A CN109501318B CN 109501318 B CN109501318 B CN 109501318B CN 201811411356 A CN201811411356 A CN 201811411356A CN 109501318 B CN109501318 B CN 109501318B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
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Abstract
The invention relates to the field of new material preparation, and discloses a profiled bar tension-compression process adopting PMI foam sandwich. The inventive method consists in producing a fiber-reinforced profiled bar and simultaneously filling it with a PMI foam core. The PMI foam core material has a very good connection effect with the profiled section of the fiber reinforcement material in the same process step. The problems in the prior art are effectively solved, the excellent connecting effect of the foam core material and the skin material can be realized, the non-adhesive layer is favorable for the weight reduction requirement of a product, and the non-joint is favorable for the uniform bearing capacity of the hollow profiled bar and the overall stability is enhanced; the material which cannot resist the PMI foam high-temperature foaming temperature can be used as the skin, so that the selectivity of the material is expanded; the low-cost, high-efficiency and continuous manufacturing of the workpiece can be realized on specific equipment; the density of the foam, the collocation of the covering material and the like can be flexibly adjusted according to the needs, and the designability of the composite material is realized.
Description
Technical Field
The invention relates to the field of material preparation, in particular to a profiled bar tension-compression process adopting PMI foam sandwich.
Background
Poly (meth) acrylimide (PMI) foams are commonly used as core materials in composite articles and often need to be processed into various profiles.
CN108219376A discloses a PMI foam bent pipe core material and a forming method thereof, belonging to the technical field of foam core material forming. The PMI foam bent pipe core material forming method comprises the steps of cutting gaps on two sides of a straight pipe PMI foam core material, bending the straight pipe PMI foam core material into a required angle by utilizing the gaps, filling a mixed paste body formed by epoxy resin, a curing agent and hollow glass beads into the gaps, and curing to obtain the PMI foam bent pipe core material. The invention has simple processing process and strong operability, can be processed and molded without a professional processing device (milling machine), saves a large amount of manpower and material resources and reduces the processing cost of the core material.
CN104369387APMI discloses a foam sandwich carbon fiber composite engineering truck arm support and a manufacturing method thereof. The PMI foam sandwich carbon fiber composite engineering truck arm support comprises a PMI foam core layer and a carbon fiber reinforced resin layer skin coated on the outer surface of the PMI foam core layer. The invention also discloses a manufacturing method of the PMI foam sandwich carbon fiber composite engineering truck arm support. The product of the invention has high strength, light weight and easy maintenance. The invention is beneficial to simplifying the tooling and the process for manufacturing the composite material arm support, shortening the production period and reducing the production cost. According to the invention, the carbon fiber material is used as the skin of the arm support, the PMI foam core material is used for replacing a core mold or an air bag in the prior art, and the advantages of high temperature resistance, high compression strength, light weight, easiness in processing and the like of the PMI foam core material are utilized, so that the carbon fiber layer is formed in an auxiliary manner, the production cost is reduced, the production period is shortened, and the precision, the instability strength and the failure strength of the arm support are improved.
CN108453993A discloses a new process suitable for the preparation of a composite material having a core consisting of a rigid foam material. The invention has the advantage here that both the foam material and the plastic of the cover layer can be freely selected. More specifically, it is also possible to process coatings whose processing temperatures are significantly different from those of the core material using the inventive method. The invention further relates to a method by which, in a second embodiment, an integrated foam structure can be partially compacted. With the third embodiment, hollow articles with particularly high-value joints can be produced from at least two pieces of foam by welding, with or without a covering layer. In addition, the foam can be processed particularly well by vacuum forming methods using the method of the invention.
The above patents and the prior art generally adopt prepolymer particle in-mold foaming method to prepare hollow profiled body filled with PMI foam, but due to the higher PMI foaming temperature, it is impossible to use thermally unstable material as the hollow profiled shell, and the connection effect between the foam and the outer layer profile body caused during foaming is very weak, which is not good for the performance effect of the composite material as the whole. Or after the foamed foam board is cut into a foam core with a proper size, the foam core is filled into an open hollow shell, and the shell of the exposed part of the foam core is integrally sealed in a gluing mode. There are also ways to place the foam core together with the fibrous material into a mould and inject the resin into the mould and cure it. Although joints are avoided here, this method has the same disadvantages as the previous method in terms of excess material, process speed and complexity.
Disclosure of Invention
In order to solve the problems, the invention provides a special-shaped material drawing and pressing process adopting PMI foam sandwich.
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating and impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process can be realized in an impregnation tank or realized by pressurizing in a forming tool;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fibrous material is used in the form of individual fibers, rovings or woven cloth.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 37.2-45.8 parts of tripentaerythritol, 75.3-89.7 parts of oleic acid, 300 parts of 180-class toluene and 0.05-0.2 part of phosphoric acid into a reaction kettle, controlling the temperature at 110-130 ℃, reacting with water for 5-10h, controlling the temperature at 75-90 ℃ after the reaction is finished, adding 18.3-30.8 parts of acrylic acid, continuing to react for 3-7h, then adding 3-8 parts of isopropyltriethoxysilane isocyanate, 2-6 parts of dimethylaminoballium, 0.5-2.5 parts of thulium acetylacetonate trihydrate, 0.02-2 parts of (1S,2R) - (-) -1-amino-2-indanol and 0.005-0.2 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, uniformly stirring, then adding 1-5 parts of cyclohexanone peroxide, the gallium thulium doped surface treating agent can be obtained after even mixing.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 30-200kg/m3The PMI foam core can adopt a prepolymer in-mold foaming mode, and can also be cut and processed in shape from a foamed foam board, the foam core of the foam core has a cut surface layer open-cell structure, the pore diameter of the cells can be adjusted according to requirements, and resin can permeate the cells before being cured incompletely to form a better interface bonding anchoring structure.
The resin is epoxy resin or polyester resin or vinyl ester resin or phenolic resin or PU resin, and the curing temperature is 100-200 ℃.
The fiber material is carbon fiber or glass fiber or basalt fiber or polymer fiber, especially aramid fiber or textile fiber.
In the forming method, the winding direction of the fibers can be designed according to the mechanical strength requirement of the workpiece, and preferably, the fiber winding PMI foam core is formed into a fabric structure.
The invention mainly provides a method for preparing a fiber reinforced hollow profile filled with PMI foam core materials. The invention effectively solves the problems in the prior art and realizes the following advantages: (1) the foam core material and the skin material can be well connected, the non-adhesive layer is favorable for the weight reduction requirement of a product, and the non-joint is favorable for the uniform bearing capacity of the hollow profiled bar and the overall stability is enhanced; (2) the material which cannot resist the PMI foam high-temperature foaming temperature can be used as the skin, so that the selectivity of the material is expanded; (3) the low-cost, high-efficiency and continuous manufacturing of the workpiece can be realized on specific equipment; (4) the density of the foam, the collocation of covering materials (fiber and resin) and the like can be flexibly adjusted according to the needs, and the designability of the composite material is realized.
Drawings
FIG. 1 is a schematic view of a drawing and pressing process.
1. Gathering the fiber filaments together; 2. Separating the roving and aligning the fibers; 3. impregnating the fibers in an impregnation tank with a specific resin formulation; 4. preforming the fibers by using a die tool; 5. forming and curing the workpiece in a heated die; 6. A cooling section; 7. drawing; 8. separating the cutting equipment; 9. A foam core is attached.
Detailed Description
The invention is further illustrated by the following specific examples:
the raw materials used in the following examples are all commercially available products, the parts are by weight, and the examples are further illustrative of the present invention and do not limit the scope of the present invention;
example 1
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating and impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process can be realized in an impregnation tank;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fibrous material is used in the form of individual fibers.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
according to the mass parts, 39 parts of 4 tripentaerythritol, 78 parts of oleic acid, 200 parts of toluene and 0.1 part of phosphoric acid are added into a reaction kettle, the temperature is controlled at 114 ℃, the reaction is carried out for 7 hours with water, the temperature is controlled at 78 ℃ after the reaction is finished, 19 parts of acrylic acid is added, the reaction is continued for 4 hours, then 5 parts of isopropyltriethoxysilane isocyanate, 5 parts of triaminogallium, 0.8 part of thulium acetylacetonate trihydrate, 0.1 part of (1S,2R) - (-) -1-amino-2-indanol and 0.008 part of L-octahydroindole-2-carboxylic acid are added into the reaction kettle, after uniform stirring, 3 parts of cyclohexanone peroxide are added, and after uniform mixing, the gallium thulium doped surface treating agent is obtained.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 30-110kg/m3The PMI foam core is obtained in a form of prepolymer in-mold foaming.
The resin is epoxy resin, and the curing temperature of the epoxy resin is 140 ℃.
The fiber material is carbon fiber.
In the molding process described, the fiber wound PMI foam core forms a fabric structure.
The tensile strength of the prepared product was 17.25MPa, and the bonding strength between the covering material and the core material was 251.32N/cm.
Example 2
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating and impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process is realized by pressurizing in a forming tool;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fiber material is used in the form of rovings.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 37.2 parts of tripentaerythritol, 75.3 parts of oleic acid, 180 parts of toluene and 0.05 part of phosphoric acid into a reaction kettle, controlling the temperature to 110 ℃, reacting with water for 5 hours, controlling the temperature to 75 ℃ after the reaction is finished, adding 18.3 parts of acrylic acid, continuing to react for 3 hours, then adding 3 parts of isopropyltriethoxysilane isocyanate, 2 parts of triaminogallium, 0.5 part of thulium acetylacetonate trihydrate, 0.02 part of (1S,2R) - (-) -1-amino-2-indanol and 0.005 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, stirring uniformly, then adding 1 part of cyclohexanone peroxide, and mixing uniformly to obtain the gallium-thulium doped surface treating agent.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 150-200kg/m3The PMI foam core is cut and processed in shape from the foamed foam board, and the foam core has a surface layer open-cell structure after cutting, so that resin can permeate into cells before incomplete curing, and a better interface adhesive bonding anchoring structure is formed.
The resin is polyester resin, and the curing temperature of the resin is 100 ℃.
The fiber material is glass fiber.
In the molding process described, the fiber wound PMI foam core forms a fabric structure.
The tensile strength of the prepared product is 16.04MPa, and the bonding strength between the covering material and the core material is 23.5.07N/cm.
Example 3
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating, namely impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process is realized in an impregnation tank;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fiber material is used in the form of woven cloth.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 45.8 parts of tripentaerythritol, 89.7 parts of oleic acid, 300 parts of toluene and 0.05-0.2 part of phosphoric acid into a reaction kettle, controlling the temperature at 130 ℃, reacting for 10 hours with water, controlling the temperature at 90 ℃ after the reaction is finished, adding 30.8 parts of acrylic acid, continuing to react for 3-7 hours, then adding 8 parts of isopropyltriethoxysilane isocyanate, 6 parts of triaminogallium, 2.5 parts of thulium acetylacetonate trihydrate, 2 parts of (1S,2R) - (-) -1-amino-2-indanol and 0.2 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, stirring uniformly, then adding 1-5 parts of cyclohexanone peroxide, and mixing uniformly to obtain the gallium-thulium doped surface treating agent.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 110-150kg/m3The PMI foam core adopts a prepolymer in-mold foaming mode.
The resin is vinyl ester resin, and the curing temperature of the resin is 200 ℃.
The fiber material is basalt fiber.
The filament wound PMI foam core forms a fabric structure in the forming process.
The tensile strength of the prepared product was 18.62MPa, and the bonding strength between the covering material and the core material was 264.51N/cm.
Example 4
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating and impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process can be realized in an impregnation tank;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fibrous material is used in the form of individual fibers.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 37.2 parts of tripentaerythritol, 89.7 parts of oleic acid, 180 parts of toluene and 0.2 part of phosphoric acid into a reaction kettle, controlling the temperature at 110 ℃, carrying out a reaction with water for 10 hours, controlling the temperature at 75 ℃ after the reaction is finished, adding 30.8 parts of acrylic acid, continuing the reaction for 3 hours, then adding 8 parts of isopropyltriethoxysilane isocyanate, 2 parts of triaminogallium, 2.5 parts of thulium acetylacetonate trihydrate, 0.02 parts of (1S,2R) - (-) -1-amino-2-indanol and 0.2 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, stirring uniformly, then adding 1 part of cyclohexanone peroxide, and mixing uniformly to obtain the gallium-thulium doped surface treating agent.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 110-150kg/m3The PMI foam core adopts a prepolymer in-mold foaming mode.
The resin is PU resin, and the curing temperature of the resin is 135 ℃.
The fiber material is textile fiber.
In the molding process described, the fiber wound PMI foam core forms a fabric structure.
The tensile strength of the prepared product is 17.52MPa, and the bonding strength between the covering material and the core material is 241.37N/cm.
Example 5
A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating, namely impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process is realized in an impregnation tank;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
and (4) cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of the equipment by a full-automatic program.
The fiber material is used in the form of woven cloth.
The covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
The gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 45.8 parts of tripentaerythritol, 75.3 parts of oleic acid, 300 parts of toluene and 0.05 part of phosphoric acid into a reaction kettle, controlling the temperature at 130 ℃, reacting with water for 10 hours, controlling the temperature at 75 ℃ after the reaction is finished, adding 18.3 parts of acrylic acid, continuing to react for 7 hours, then adding 8 parts of isopropyltriethoxysilane isocyanate, 2 parts of dimethylaminogallium, 0.5 part of thulium acetylacetonate trihydrate, 2 parts of (1S,2R) - (-) -1-amino-2-indanol and 0.005 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, stirring uniformly, then adding 1 part of cyclohexanone peroxide, and mixing uniformly to obtain the gallium-thulium doped surface treating agent.
The principle of the stretch-compression molding method is an improved method of introduction around a foam core.
The PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
The PMI foam core has a material density in the range of 110-150kg/m3PMI bubble ofAnd the PMI foam core adopts a prepolymer in-mold foaming mode.
The resin is phenolic resin, and the curing temperature of the resin is 130 ℃.
The fiber material is aramid fiber.
In the molding process described, the fiber wound PMI foam core forms a fabric structure.
The tensile strength of the prepared product is 16.98MPa, and the bonding strength between the covering material and the core material is 249.21N/cm.
Comparative example 1
The same preparation method as in example 1 was used except that no covering material was added.
The tensile strength of the prepared product is 1.5 MPa.
Comparative example 2
The same preparation method as that of example 1 was used except that the gallium-thulium-doped surface treatment agent was not added.
The tensile strength of the prepared product is 16.21MPa, and the bonding strength between the covering material and the core material is 184.30N/cm.
Comparative example 3
The same preparation method as in example 1 was used except that no carbon fiber was added.
The tensile strength of the prepared product is 4.58MPa, and the bonding strength between the covering material and the core material is 245.17N/cm.
Comparative example 4
The same preparation method as in example 1 was used except that no epoxy resin was added.
The tensile strength of the prepared product is 12.39MPa, and the bonding strength between the covering material and the core material is 241.06N/cm.
Comparative example 5
The same preparation as in example 1 was carried out without addition of vinyltris (2-methoxyethoxy) silane.
The tensile strength of the prepared product is 17.92MPa, and the bonding strength between the covering material and the core material is 241.68N/cm.
Comparative example 6
The tensile strength of the product prepared by the same preparation method as that of example 1 without adding trimethylaminogallium was 14.71 MPa.
Comparative example 7
The tensile strength of the product prepared by the same preparation method as that of example 1 without adding thulium acetylacetonate trihydrate was 14.59 MPa.
Comparative example 8
The tensile strength of the product prepared by the same preparation method as that of example 1 without adding (1S,2R) - (-) -1-amino-2-indanol was 15.89 MPa.
Comparative example 9
The tensile strength of the product obtained by the same production method as in example 1 was 15.02MPa without adding L-octahydroindole-2-carboxylic acid.
Claims (9)
1. A profiled bar tension-compression process adopting PMI foam sandwich is characterized by comprising the following steps:
impregnating and impregnating a plurality of fibers or rovings with resin, wherein the resin impregnation process can be realized in an impregnation tank or realized by pressurizing in a forming tool;
performing, namely performing a performing process on the fiber material by using a die tool after the fiber material is impregnated with resin;
curing and molding, namely, impregnating a fiber material with resin to realize the curing of the resin in a molding die to form a covering material, and simultaneously, synchronously and continuously feeding the PMI foam core to realize coating and realize the final molding of a product; the uniformity of the temperature in the die is ensured, the uniform solidification of the workpiece is realized, and the influence of thermal stress is eliminated; the forming die is generally connected with a device for cooling the finished hollow profile; the PMI foam core is characterized in that a gallium thulium-doped surface treatment agent is sprayed on the surface of the PMI foam core before feeding;
cutting, namely cutting the continuous profile into individual workpieces with required lengths at the tail end of equipment by a full-automatic program;
the gallium and thulium doped surface treating agent is prepared according to the following scheme:
adding 37.2-45.8 parts of tripentaerythritol, 75.3-89.7 parts of oleic acid, 300 parts of 180-class toluene and 0.05-0.2 part of phosphoric acid into a reaction kettle, controlling the temperature at 110-130 ℃, reacting with water for 5-10h, controlling the temperature at 75-90 ℃ after the reaction is finished, adding 18.3-30.8 parts of acrylic acid, continuing to react for 3-7h, then adding 3-8 parts of isopropyltriethoxysilane isocyanate, 2-6 parts of dimethylaminoballium, 0.5-2.5 parts of thulium acetylacetonate trihydrate, 0.02-2 parts of (1S,2R) - (-) -1-amino-2-indanol and 0.005-0.2 part of L-octahydroindole-2-carboxylic acid into the reaction kettle, uniformly stirring, then adding 1-5 parts of cyclohexanone peroxide, the gallium thulium doped surface treating agent can be obtained after even mixing.
2. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the fibrous material is used in the form of individual fibers, rovings or woven cloth.
3. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the covering material is a thermosetting material reinforced with a fibrous material; and the foam core is a PMI foam, and the profile is free of adhesive layers and free of connecting joints.
4. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the principle of the stretch-compression molding method is an improved method of introduction around a foam core.
5. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the PMI foam core material is continuously introduced into a tension-compression molding device in the form of single workpieces at certain intervals.
6. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the PMI foam core is PMI foam with the density range of 30-200kg/m3, can adopt a prepolymer in-mold foaming form, and can also be cut and processed in shape from a foamed foam board, the foam core of the PMI foam core has a cut surface layer open-cell structure, the pore diameter of a cell can be adjusted according to requirements, and resin can permeate into the cell before being incompletely cured, so that a better interface adhesive bonding anchoring structure is formed.
7. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the resin is epoxy resin or polyester resin or vinyl ester resin or phenolic resin or PU resin, and the curing temperature is 100-200 ℃.
8. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: the fiber material is carbon fiber, glass fiber, basalt fiber or polymer fiber, and is further selected from aramid fiber or textile fiber.
9. A profiled bar drawing and pressing process using PMI foam sandwich as claimed in claim 1, wherein: in the forming method, the winding direction of the fibers can be designed according to the mechanical strength requirement of the workpiece, and further, the fiber winding PMI foam core is selected to form a fabric structure.
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| CN114851589A (en) * | 2021-02-05 | 2022-08-05 | 重庆国际复合材料股份有限公司 | Production method of thermal insulation carriage plate and thermal insulation carriage plate |
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| CN103264512A (en) * | 2013-05-24 | 2013-08-28 | 南京工业大学 | Continuous production equipment and continuous production technology of foam core composite material sandwich plate |
| CN104672782A (en) * | 2014-12-31 | 2015-06-03 | 国家电网公司 | Fiber-reinforced resin-based composite material core and preparation method thereof |
| CN108621451A (en) * | 2018-04-13 | 2018-10-09 | 杭州碳谱新材料科技有限公司 | The tension and compression molding machine and method of sandwich sandwich structure composite material |
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| CN106118649A (en) * | 2016-06-13 | 2016-11-16 | 郑甘裕 | A kind of thulium ytterbium codope zirconium gallium converting luminescent material of sulfide, preparation method and application |
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| CN103264512A (en) * | 2013-05-24 | 2013-08-28 | 南京工业大学 | Continuous production equipment and continuous production technology of foam core composite material sandwich plate |
| CN104672782A (en) * | 2014-12-31 | 2015-06-03 | 国家电网公司 | Fiber-reinforced resin-based composite material core and preparation method thereof |
| CN108621451A (en) * | 2018-04-13 | 2018-10-09 | 杭州碳谱新材料科技有限公司 | The tension and compression molding machine and method of sandwich sandwich structure composite material |
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