CN113427789A - Time-saving and efficient hand-pasted glass fiber reinforced plastic production method - Google Patents
Time-saving and efficient hand-pasted glass fiber reinforced plastic production method Download PDFInfo
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- CN113427789A CN113427789A CN202110704418.0A CN202110704418A CN113427789A CN 113427789 A CN113427789 A CN 113427789A CN 202110704418 A CN202110704418 A CN 202110704418A CN 113427789 A CN113427789 A CN 113427789A
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- glass fiber
- reinforced plastic
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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
- B29C70/30—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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2061/00—Use of condensation polymers of aldehydes or ketones or derivatives thereof, as moulding material
- B29K2061/04—Phenoplasts
Abstract
The invention discloses a time-saving and efficient production method of hand-pasted glass fiber reinforced plastic, which comprises the following steps: a. preparing materials: determining a formula and a process sheet of the glass fiber reinforced plastic, preparing glass fiber and resin according to the formula, and preparing felt and cloth at the same time; b. cutting: selecting clean and dry cloth, and cutting the cloth and felt according to the required size of the technical bill; c. selecting and processing a mould: determining the shape, size and integrity of the die; d. uniformly mixing and stirring raw materials: according to the formula, taking the resin and the glass fiber in corresponding amounts, and fully mixing and stirring the resin and the glass fiber uniformly to obtain a pasty material; e. and (3) manufacturing a product: taking a proper amount of pasty material, and uniformly brushing a layer on the die. f. Demolding; g. treating a product: and taking the product, cutting off burrs, and correcting the end opening to obtain a finished product. This application is convenient for promote the production efficiency of hand lay-up glass steel, reduces curing time, improves heat altered shape temperature, and simultaneously, this application helps promoting bending strength, flexural modulus, tensile strength and the tensile modulus of glass steel.
Description
Technical Field
The invention relates to the technical field of glass fiber reinforced plastic manufacturing, in particular to a time-saving and efficient production method of hand-pasted glass fiber reinforced plastic.
Background
Glass Fiber Reinforced Plastics (FRP), a composite Reinforced plastic material which uses glass fibers and products thereof, such as glass cloth, belts, felts, yarns and the like as reinforcing materials and synthetic resin as a matrix material. The relative density of the FRP is between 1.5 and 2.0, only the carbon steel is 1/4 to 1/5, but the tensile strength is close to or even exceeds that of the carbon steel, and the specific strength can be compared with that of high-grade alloy steel.
Thus, excellent results have been achieved in aerospace, rocket, spacecraft, high pressure vessels, and in other article applications where weight reduction is desired. The tensile strength, the bending strength and the compressive strength of some epoxy FRP can reach more than 400 MPa. The glass fiber reinforced plastic product is greatly superior to the traditional product in performance, application and service life attributes, has the characteristics of easy modeling, customization and random color allocation, is deeply favored by merchants and sellers, occupies larger and larger market share, and has wide prospect.
According to the technological characteristics of the production method of the glass fiber reinforced plastic, the FRP has the categories of hand lay-up forming, laminating forming, RTM (resin transfer molding), extrusion drawing, compression molding, winding forming and the like. Hand lay-up forming also includes hand lay-up, bag press, spray, wet lay-up and hand lay-up without blurring.
At present, due to the raw material collocation and the equipment model, the production efficiency of manually pasting the glass fiber reinforced plastic is low, the actual requirement is difficult to meet, in addition, the glass fiber reinforced plastic has long curing time, low thermal deformation temperature and poor bending strength, bending modulus, tensile strength and tensile modulus.
Disclosure of Invention
The invention aims to solve the technical problem of providing a time-saving and efficient production method of hand-pasted glass fiber reinforced plastic, which is convenient for improving the production efficiency of the hand-pasted glass fiber reinforced plastic, reducing the curing time and improving the thermal deformation temperature, and is beneficial to improving the bending strength, the bending modulus, the tensile strength and the tensile modulus of the glass fiber reinforced plastic.
In order to solve the technical problem, the scheme of the invention is as follows:
a time-saving and efficient production method of hand-pasted glass fiber reinforced plastic comprises the following steps:
a. preparing materials: determining a formula and a process sheet of the glass fiber reinforced plastic, preparing glass fiber and resin according to the formula, and preparing felt and cloth at the same time;
b. cutting: selecting clean and dry cloth, and cutting the cloth and felt according to the required size of the technical bill;
c. selecting and processing a mould: determining the shape, size and integrity of the die, and then cleaning and repairing the defects of the die;
d. uniformly mixing and stirring raw materials: according to the formula, taking the resin and the glass fiber in corresponding amounts, and fully mixing and stirring the resin and the glass fiber uniformly to obtain a pasty material;
e. and (3) manufacturing a product: taking a proper amount of pasty materials, uniformly brushing a layer on a mould, and then sequentially adding and paving cloth and felt according to a process list;
f. demolding: demoulding the product when the hardness of the product is more than 35 to obtain the product;
g. treating a product: and taking the product, cutting off burrs, and correcting the end opening to obtain a finished product.
The resin in the step a is phenolic resin.
The phenolic resin is prepared by the following steps:
a. adding phenol, polyhydroxy phenol, formaldehyde and an alkaline catalyst into a reaction kettle according to the mol ratio of 0.8: 0.1-1.0: 0.8-1.5: 0.05-8.0, heating to 70-80, and reacting for 5-7 hours;
b. and (b) distilling the mixture obtained in the step (a) under reduced pressure, and dehydrating until the viscosity of the liquid is 6000-8000 MPa-s/25 ℃.
And c, performing reduced pressure distillation at the temperature of 50-60 ℃ and under the pressure of 0.6-0.8 MPa.
The alkaline catalyst is selected from one or more of sodium hydroxide, sodium carbonate, calcium oxide and calcium hydroxide.
The polyhydroxy phenol is one or more of catechol, resorcinol and hydroquinone.
And b, cutting into a single-layer cutting or a plurality of layers.
And c, repairing the defects, namely repairing pits and cracks and polishing and waxing the mould.
And e, paving the cloth and the felt by adopting an orthogonal paving layer.
Compared with the prior art, the invention has the beneficial effects that:
compared with the common phenolic resin glass fiber reinforced plastic, the curing speed of the phenolic resin glass fiber reinforced plastic is greatly improved, the time for completely curing the common phenolic resin glass fiber reinforced plastic is 2 hours, and the time for completely curing the phenolic resin glass fiber reinforced plastic is only 0.6-0.7 hour; in terms of the mechanical properties of the glass fiber reinforced plastic, the bending strength, the bending modulus, the tensile strength and the tensile modulus of the phenolic resin glass fiber reinforced plastic are also greatly improved compared with those of the common phenolic resin glass fiber reinforced plastic; the thermal deformation temperature of the phenolic resin glass fiber reinforced plastic reaches 220 ℃ at most, and is increased by 40 ℃ compared with the common phenolic resin glass fiber reinforced plastic. The reduction of the complete curing time is because the use of the polyhydric phenol increases the active hydroxyl in the molecular chain of the phenolic resin, so that the opportunity of the curing agent to contact with the hydroxyl is increased, the curing speed is accelerated, and the complete curing time is reduced. The phenolic resin for the fast curing type hand lay-up glass fiber reinforced plastic has more crosslinking points than common phenolic resin, so that the crosslinking density of the phenolic resin is increased, and the mechanical property and the heat distortion temperature are improved. This application is convenient for promote the production efficiency of hand lay-up glass steel, reduces curing time, improves heat altered shape temperature, and simultaneously, this application helps promoting bending strength, flexural modulus, tensile strength and tensile modulus of glass steel
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A time-saving and efficient production method of hand-pasted glass fiber reinforced plastic comprises the following steps:
a. preparing materials: determining a formula and a process sheet of the glass fiber reinforced plastic, preparing glass fiber and resin according to the formula, and preparing felt and cloth at the same time;
b. cutting: selecting clean and dry cloth, and cutting the cloth and felt according to the required size of the technical bill;
selecting clean and dry cloth, and mainly ensuring that the manufactured tempered glass has no bubble and spot defects; in the cutting process, firstly, the shape of a die is determined according to the requirement of a process sheet, and the cutting size is determined by measuring the die; in order to avoid errors in the process of manufacturing the toughened glass, the cloth can be cut into a paper pattern, especially for products with complex shapes.
c. Selecting and processing a mould: determining the shape, size and integrity of the die, and then cleaning and repairing the defects of the die; in the process of selecting and processing the mould, firstly, the size and the integrity of the mould are checked, on one hand, the mould is ensured to be in accordance with the required specification, on the other hand, the product is intact, and the mould is cleaned to be clean and free of impurities.
d. Uniformly mixing and stirring raw materials: according to the formula, taking the resin and the glass fiber in corresponding amounts, and fully mixing and stirring the resin and the glass fiber uniformly to obtain a pasty material; the glass fiber reinforced plastic is convenient to manufacture quickly, so that the quality of the glass fiber reinforced plastic is improved.
e. And (3) manufacturing a product: taking a proper amount of pasty materials, uniformly brushing a layer on a mould, and then sequentially adding and paving cloth and felt according to a process list;
in the actual manufacturing operation process, a layer of pasty material made of resin and glass fiber is uniformly brushed on the surface of the mould, then corresponding materials (felt, cloth and the like) are coated according to the layering sequence required by a technical sheet, overlapping or staggered joints are paid attention to, and orthogonal layering is adopted for the cloth. The paving layers of the felt and the cloth are not more than two layers, and the felt and the cloth are required to be soaked layer by layer during paving, so that the air bubbles are fully pushed, and the defects of air bubbles, dry spots and the like are not caused.
f. Demolding: demoulding the product when the hardness of the product is more than 35 to obtain the product;
when the product is demoulded, the product can not be demoulded in advance, and the demoulding can be carried out when the product generates a certain hardness (the hardness of the bus is more than 35); in the demoulding process, the mould is light as much as possible, and hard objects (such as an iron hammer) cannot be knocked by the mould, and a wood hammer and a rubber hammer can be used. Moreover, when the film is removed; the speed is not too fast, the existence of different samples needs to be carefully observed, and the conditions such as whitening, cracking and the like need to be stopped immediately.
g. Treating a product: and taking the product, cutting off burrs, and correcting the end opening to obtain a finished product. The glass fiber reinforced plastic product obtained after demolding is cut off burrs and trimmed at the end. And inspecting the surface and the lining of the product, and if the surface and the lining of the product have defects, processing the surface and the lining of the product, and brushing glue on the polished positions.
The resin in the step a is phenolic resin. The phenolic resin has good mechanical strength and heat resistance, and is beneficial to enhancing the strength of the glass fiber reinforced plastic.
The phenolic resin is prepared by the following steps:
a. adding phenol, polyhydroxy phenol, formaldehyde and an alkaline catalyst into a reaction kettle according to the mol ratio of 0.8: 0.1-1.0: 0.8-1.5: 0.05-8.0, heating to 70-80, and reacting for 5-7 hours;
b. and (b) distilling the mixture obtained in the step (a) under reduced pressure, and dehydrating until the viscosity of the liquid is 6000-8000 MPa-s/25 ℃.
And c, performing reduced pressure distillation at the temperature of 50-60 ℃ and under the pressure of 0.6-0.8 MPa.
The alkaline catalyst is selected from one or more of sodium hydroxide, sodium carbonate, calcium oxide and calcium hydroxide.
The polyhydroxy phenol is one or more of catechol, resorcinol and hydroquinone.
And b, cutting into a single-layer cutting or a plurality of layers.
In the cutting process, the criss-cross alternate layering is considered, and the lapping of the cloth should have allowance, generally about 20 mm. Or butt joint or lap joint, and joints are staggered during butt joint or lap joint; in order to reduce the flaws caused by the ripples on the glass fiber reinforced plastic product, the cutting of the cloth is reduced as much as possible; meanwhile, in order to facilitate folding and cutting, one yarn can be drawn at the cutting position and then cut.
And c, repairing the defects, namely repairing pits and cracks and polishing and waxing the mould.
After the mould is cleaned and cleaned without impurities, when pits and cracks are found, the mould is repaired, a layer of demoulding wax is uniformly applied, and then the mould is polished for more than three times.
And e, paving the cloth and the felt by adopting an orthogonal paving layer.
The measurement results of the prepared phenolic resin glass fiber reinforced plastic are shown in the following table 1:
table 1 comparison of phenolic resin fiberglass test results:
where, the complete cure time in the above table refers to the performance parameter of the phenolic resin curing by itself.
As can be seen from the comparison of the above table, the curing speed of the phenolic resin glass fiber reinforced plastic is greatly improved compared with that of the common glass fiber reinforced plastic, the complete curing time of the common glass fiber reinforced plastic is 2 hours, and the complete curing time of the phenolic resin glass fiber reinforced plastic is only 0.6-0.7 hour; in terms of the mechanical properties of the glass fiber reinforced plastic, the bending strength, the bending modulus, the tensile strength and the tensile modulus of the phenolic resin glass fiber reinforced plastic are greatly improved compared with those of common resin glass fiber reinforced plastic; the thermal deformation temperature of the phenolic resin glass fiber reinforced plastic reaches 220 ℃ at most, and is increased by 40 ℃ compared with the common glass fiber reinforced plastic. The reduction of the complete curing time is because the use of the polyhydric phenol increases the active hydroxyl in the molecular chain of the phenolic resin, so that the opportunity of the curing agent to contact with the hydroxyl is increased, the curing speed is accelerated, and the complete curing time is reduced. The phenolic resin for the fast curing type hand lay-up glass fiber reinforced plastic has more crosslinking points than common phenolic resin, so that the crosslinking density of the phenolic resin is increased, and the mechanical property and the heat distortion temperature are improved. This application is convenient for promote the production efficiency of hand lay-up glass steel, reduces curing time, improves heat altered shape temperature, and simultaneously, this application helps promoting bending strength, flexural modulus, tensile strength and tensile modulus of glass steel
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (9)
1. A time-saving and efficient production method of hand-pasted glass fiber reinforced plastic is characterized by comprising the following steps: the method comprises the following steps:
a. preparing materials: determining a formula and a process sheet of the glass fiber reinforced plastic, preparing glass fiber and resin according to the formula, and preparing felt and cloth at the same time;
b. cutting: selecting clean and dry cloth, and cutting the cloth and felt according to the required size of the technical bill;
c. selecting and processing a mould: determining the shape, size and integrity of the die, and then cleaning and repairing the defects of the die;
d. uniformly mixing and stirring raw materials: according to the formula, taking the resin and the glass fiber in corresponding amounts, and fully mixing and stirring the resin and the glass fiber uniformly to obtain a pasty material;
e. and (3) manufacturing a product: taking a proper amount of pasty materials, uniformly brushing a layer on a mould, and then sequentially adding and paving cloth and felt according to a process list;
f. demolding: demoulding the product when the hardness of the product is more than 35 to obtain the product;
g. treating a product: and taking the product, cutting off burrs, and correcting the end opening to obtain a finished product.
2. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 1 or 5, characterized in that: the resin in the step a is phenolic resin.
3. A time-saving and efficient production method of hand-pasted glass fiber reinforced plastic as claimed in claim 2, which is characterized in that: the phenolic resin is prepared by the following steps:
a. adding phenol, polyhydroxy phenol, formaldehyde and an alkaline catalyst into a reaction kettle according to the mol ratio of 0.8: 0.1-1.0: 0.8-1.5: 0.05-8.0, heating to 70-80, and reacting for 5-7 hours;
b. and (b) distilling the mixture obtained in the step (a) under reduced pressure, and dehydrating until the viscosity of the liquid is 6000-8000 MPa-s/25 ℃.
4. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 3, characterized in that: and c, performing reduced pressure distillation at the temperature of 50-60 ℃ and under the pressure of 0.6-0.8 MPa.
5. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 3, characterized in that: the alkaline catalyst is selected from one or more of sodium hydroxide, sodium carbonate, calcium oxide and calcium hydroxide.
6. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 3, characterized in that: the polyhydroxy phenol is one or more of catechol, resorcinol and hydroquinone.
7. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 1, which is characterized in that: and b, cutting into a single-layer cutting or a plurality of layers.
8. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 1, which is characterized in that: and c, repairing the defects, namely repairing pits and cracks and polishing and waxing the mould.
9. A time-saving and efficient hand-pasted glass fiber reinforced plastic production method as claimed in claim 1, which is characterized in that: and e, paving the cloth and the felt by adopting an orthogonal paving layer.
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|---|---|---|---|
| CN202110704418.0A CN113427789A (en) | 2021-06-24 | 2021-06-24 | Time-saving and efficient hand-pasted glass fiber reinforced plastic production method |
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| CN202110704418.0A CN113427789A (en) | 2021-06-24 | 2021-06-24 | Time-saving and efficient hand-pasted glass fiber reinforced plastic production method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1286161A (en) * | 1999-08-26 | 2001-03-07 | 广州市科宝有限公司 | Quickly shaping technology for glass fibre reinforced plastics products |
| JP2002018968A (en) * | 2000-06-30 | 2002-01-22 | Tsukishima Kikai Co Ltd | Method and apparatus for manufacturing fiber reinforced resin sheet |
| CN102212179A (en) * | 2011-05-03 | 2011-10-12 | 山东圣泉化工股份有限公司 | Preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic |
| CN104249461A (en) * | 2013-06-27 | 2014-12-31 | 蒋娇 | Manufacturing method of glass steel by hand molding |
| CN104742379A (en) * | 2015-03-25 | 2015-07-01 | 上海德竑玻璃钢制品有限公司 | Mould for fiber reinforced plastic and manufacturing method of fiber reinforced plastic |
-
2021
- 2021-06-24 CN CN202110704418.0A patent/CN113427789A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1286161A (en) * | 1999-08-26 | 2001-03-07 | 广州市科宝有限公司 | Quickly shaping technology for glass fibre reinforced plastics products |
| JP2002018968A (en) * | 2000-06-30 | 2002-01-22 | Tsukishima Kikai Co Ltd | Method and apparatus for manufacturing fiber reinforced resin sheet |
| CN102212179A (en) * | 2011-05-03 | 2011-10-12 | 山东圣泉化工股份有限公司 | Preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic |
| CN104249461A (en) * | 2013-06-27 | 2014-12-31 | 蒋娇 | Manufacturing method of glass steel by hand molding |
| CN104742379A (en) * | 2015-03-25 | 2015-07-01 | 上海德竑玻璃钢制品有限公司 | Mould for fiber reinforced plastic and manufacturing method of fiber reinforced plastic |
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