CN114147997A - Method for producing composite material product by air blowing process - Google Patents
Method for producing composite material product by air blowing process Download PDFInfo
- Publication number
- CN114147997A CN114147997A CN202111428752.4A CN202111428752A CN114147997A CN 114147997 A CN114147997 A CN 114147997A CN 202111428752 A CN202111428752 A CN 202111428752A CN 114147997 A CN114147997 A CN 114147997A
- Authority
- CN
- China
- Prior art keywords
- core shaft
- prepreg
- composite material
- material product
- curing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The present invention relates to a method for producing composite articles, and more particularly to a method for producing composite articles by an air blowing process. The method comprises the following steps: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified; wrapping the prepreg on the preformed film, taking out the preformed film, putting the preformed film into a core shaft, putting the preformed film and the core shaft into a mold cavity, heating and blowing air to the core shaft for curing, filling the core shaft with the preformed film cavity in the blowing process to enable the core shaft to be attached to the mold cavity surface, and removing the core shaft after curing is finished to obtain the composite material product. According to the invention, the prepreg is firstly wrapped on the preformed film to reach the shape and size of the composite material product, and then the mandrel is placed in the prepreg and blown, so that the whole operation is simple, the construction operation is convenient, the fitting property of the prepreg and the mold cavity is ensured, and the prepared composite material has a good forming effect.
Description
Technical Field
The present invention relates to composite material production, and is especially the blowing process of producing composite material product.
Background
Blow molding, also known as hollow molding, is a manufacturing process for forming hollow plastic parts: it was originally used to form glass bottles. Generally, various blow molding methods include extrusion blow molding, injection stretch blow molding, and bag molding. In the existing bag press molding process, a fiber preform is laid in a mold, covered with a soft isolation film, cured under hot pressing, and after a required curing period, the material forms a member with a certain structure. The bag pressing forming method has the disadvantages of complex process, high operation difficulty and difficulty in ensuring the sealing property between the die and the prepreg.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a method for producing a composite material product by using an air blowing process.
The technical purpose of the invention is realized by the following technical scheme, and the method for producing the composite material product by the air blowing process comprises the following steps:
(1) pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating and blowing air to the core shaft for curing, filling the mold cavity with the core shaft in the blowing process, attaching the core shaft to the mold cavity surface, and removing the core shaft after curing is finished to obtain the composite material product.
Before blow molding, the surface of the mold needs to be cleaned and polished to be bright so as to reduce marks on the surface of the composite material product at the later stage, and then demolding wax and gel coat resin are coated, wherein the gel coat resin can provide a protective layer for the prepreg, so that the performances of corrosion resistance, wear resistance and the like of the composite material product are improved. The invention firstly wraps the prepreg on the preformed film, and compared with the method of directly spreading the prepreg in a mold cavity, the method of wrapping the prepreg on the preformed film can preliminarily form the shape and the size of the composite material product, thereby preparing the composite material product with more accurate and better molding effect, then replaces the preformed film with a mandrel, heats and blows air to the mandrel for curing, the mandrel can be filled with the mold cavity in the blowing process and is tightly attached to the inner surface of the mold cavity, so that the prepared composite material product has a smoother surface, and the generation of wrinkles is avoided.
The mandrel is silica gel or an air bag. The mandrel is made of silica gel, the silica gel has unique expansion with heat and contraction with cold performance, the requirement on the flatness of the inner side is higher or the main body is larger but the opening of the composite material product is smaller, and the silica gel has unique expansion with heat and contraction with cold characteristic to be taken out of the composite material product easily in the process of solidifying and cooling the product gradually.
The hardness of the silica gel is 20-40 degrees, and preferably, the hardness of the silica gel is 30 degrees; the volume thermal expansion coefficient range of the silica gel is 5.9-7.9 x10-4Preferably, the volume thermal expansion coefficient of the silicon rubber ranges from 6.5 to 7.0x10-4The silica gel in the volume thermal expansion coefficient range has good tensile strength and sealing property.
The air bag is made of polyethylene or nylon, has better mechanical property, and avoids the phenomenon that the air bag is broken in the forming process to cause poor combination between layers of a composite material product and scrap.
The prepreg is a carbon fiber prepreg or a glass fiber prepreg.
In the step (2), the curing temperature is 130-140 ℃, and the curing time is 1-3 h.
The invention has the following beneficial effects:
(1) according to the invention, the prepreg is wrapped on the preformed film, and compared with the method of directly spreading the prepreg in the die cavity, the method of wrapping the prepreg on the preformed film can preliminarily form the shape and size of the composite material product, so that the prepreg is tightly attached to the inner wall of the die cavity, and the composite material product with higher accuracy and better forming effect is further prepared, and the method is simple in integral operation and convenient for construction operation;
(2) according to the invention, silica gel with excellent thermal expansion and cold contraction performance can be selected as the mandrel, the composite material product with higher requirement on the flatness of the inner side or larger main body but smaller opening is selected, and the unique thermal expansion and cold contraction characteristics of the silica gel enable the silica gel to be easily taken out of the air bag in the process of curing and gradually cooling the product, so that the whole operation is simple, and the construction operation is convenient;
(3) the invention can select the air bag made of polyethylene or nylon as the mandrel, thereby avoiding the scrapping of the composite material product due to poor interlayer bonding caused by hole breaking of the air bag in the forming process.
Detailed Description
Example 1
(1) Pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating to 135 ℃, blowing air to the core shaft for curing for 2h, filling the core shaft into the mold cavity in the blowing process, enabling the core shaft to be attached to the mold cavity surface, and removing the core shaft after curing is completed to obtain the composite material product.
Wherein, in the step (2), the mandrel is made of silica gel, the hardness is 30 degrees, and the volume thermal expansion coefficient range of the silica gel is 6.5x10-4/℃。
Example 2
(1) Pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating to 140 ℃, blowing air to the core shaft for curing for 1h, filling the core shaft into the mold cavity in the air blowing process, enabling the core shaft to be attached to the cavity surface of the mold, and removing the core shaft after curing is completed to obtain the composite material product.
Wherein, in the step (2), the mandrel is made of silica gel, the hardness is 20 degrees, and the volume thermal expansion coefficient range of the silica gel is 5.9x10-4/℃。
Example 3
(1) Pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating to 130 ℃, blowing air to the core shaft for curing, wherein the curing time is 3h, filling the mold cavity with the core shaft in the blowing process, enabling the core shaft to be attached to the cavity surface of the mold, and removing the core shaft after curing is completed to obtain the composite material product.
Wherein, in the step (2), the mandrel is made of silica gel, the hardness is 40 degrees, and the volume thermal expansion coefficient range of the silica gel is 7.9x10-4/℃。
Example 4
(1) Pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating to 135 ℃, blowing air to the core shaft for curing for 2h, filling the core shaft into the mold cavity in the blowing process, enabling the core shaft to be attached to the mold cavity surface, and removing the core shaft after curing is completed to obtain the composite material product.
Wherein, in the step (2), the mandrel is an air bag, and the material of the air bag is polyethylene.
Example 4
(1) Pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating to 130 ℃, blowing air to the core shaft for curing, wherein the curing time is 3h, filling the mold cavity with the core shaft in the blowing process, enabling the core shaft to be attached to the cavity surface of the mold, and removing the core shaft after curing is completed to obtain the composite material product.
Wherein, in the step (2), the mandrel is an air bag, and the material of the air bag is nylon.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is conceivable, and the examples presented herein demonstrate the results of applicants' actual experiments. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (6)
1. A method of producing a composite article by an air blowing process comprising the steps of:
(1) pretreatment of a mold: uniformly coating demolding wax on the surface of the negative film, then spraying gel coat resin, and standing until the gel coat resin is solidified;
(2) air blowing forming: wrapping the prepreg on the preformed film, taking out the preformed film after the shape and size of the composite material product are achieved, putting the core shaft, putting the prepreg and the core shaft into a mold cavity, heating and blowing air to the core shaft for curing, filling the mold cavity with the core shaft in the blowing process, attaching the core shaft to the mold cavity surface, and removing the core shaft after curing is finished to obtain the composite material product.
2. The method of claim 1, wherein the mandrel is a silicone or an air bag.
3. The method for producing a composite material product by an air blowing process as claimed in claim 2, wherein the silica gel has a hardness of 20 ° to 40 °, and a volume thermal expansion coefficient of 5.9 to 7.9x10-4/℃。
4. The method of claim 2, wherein the air bag is made of polyethylene or nylon.
5. The method of manufacturing a composite article according to claim 1, wherein the prepreg is a carbon fiber prepreg or a glass fiber prepreg.
6. The method for producing a composite product by an air blowing process according to claim 1, wherein in the step (2), the curing temperature is 130-140 ℃ and the curing time is 1-3 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111428752.4A CN114147997A (en) | 2021-11-29 | 2021-11-29 | Method for producing composite material product by air blowing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111428752.4A CN114147997A (en) | 2021-11-29 | 2021-11-29 | Method for producing composite material product by air blowing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114147997A true CN114147997A (en) | 2022-03-08 |
Family
ID=80784224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111428752.4A Pending CN114147997A (en) | 2021-11-29 | 2021-11-29 | Method for producing composite material product by air blowing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114147997A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587124A (en) * | 2013-11-06 | 2014-02-19 | 江苏恒神纤维材料有限公司 | Manufacturing method of carbon fiber composite material rectangular hollow pipe for mechanical arm |
| CN108127938A (en) * | 2017-12-20 | 2018-06-08 | 陈锦松 | Carbon fiber workpieces mandrel airbag integrated forming technique |
-
2021
- 2021-11-29 CN CN202111428752.4A patent/CN114147997A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587124A (en) * | 2013-11-06 | 2014-02-19 | 江苏恒神纤维材料有限公司 | Manufacturing method of carbon fiber composite material rectangular hollow pipe for mechanical arm |
| CN108127938A (en) * | 2017-12-20 | 2018-06-08 | 陈锦松 | Carbon fiber workpieces mandrel airbag integrated forming technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108115948B (en) | Composite material forming core mold and preparation method | |
| CN107458001A (en) | Bicycle frame of carbon fiber integral type pre-shaped moulding process | |
| CN105690803A (en) | Vacuum thermal expansion molding process for composite | |
| EP0908292A4 (en) | Method and apparatus for producing a blow molded article | |
| WO2018133177A1 (en) | Application of hsm process in wing moulding and method for moulding wing | |
| CN109968701A (en) | A kind of preparation method of the reusable double-deck airbag | |
| CN110774623A (en) | Manufacturing method of simple-modeling carbon fiber composite part of hydrogen energy automobile | |
| CN101973101A (en) | Manufacturing process of recreation vehicle head | |
| CN104552677A (en) | Manufacturing process of composite material die for autoclave | |
| CN107089017B (en) | A kind of high-energy rubber shaping fiber answers the thermal expansion technique of material product | |
| CN108864995B (en) | Multi-axial composite material bent pipe and preparation method thereof | |
| CN114147997A (en) | Method for producing composite material product by air blowing process | |
| CN112895514A (en) | Forming die and forming process for composite material product with complex structure | |
| CN115476564B (en) | Composite material with modified polypropylene foaming formed body as core layer and preparation method thereof | |
| CN113910647A (en) | Method for manufacturing frame piece of billiard table | |
| CN114393854A (en) | Carbon fiber hollow pipe forming method based on silica gel core mold | |
| WO2007109928A1 (en) | A method of forming profile shell product with carbon fiber | |
| CN111673957A (en) | Auxiliary inflation air mold for molding hollow composite material structural part | |
| CN109795134B (en) | Special-shaped pipe forming method | |
| CN110936634B (en) | Forming method of foam interlayer composite material | |
| CN115723348A (en) | Composite material pipe forming method by means of thermal expansion glue | |
| CN107487002B (en) | A method of quant is prepared using HSM moulding process | |
| CN104801027A (en) | Manufacture method for baseball bat | |
| CN106985414A (en) | A kind of preparation method of the helmet | |
| CN107718604B (en) | A method of ice curved bar is prepared using HSM moulding process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |