CN112454946A - Preparation method of wood grain glass fiber reinforced plastic pultrusion section - Google Patents
Preparation method of wood grain glass fiber reinforced plastic pultrusion section Download PDFInfo
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- CN112454946A CN112454946A CN202011213396.XA CN202011213396A CN112454946A CN 112454946 A CN112454946 A CN 112454946A CN 202011213396 A CN202011213396 A CN 202011213396A CN 112454946 A CN112454946 A CN 112454946A
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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
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
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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
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/528—Heating or cooling
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention provides a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, and relates to the technical field of glass fiber reinforced plastic preparation. The invention provides a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, which comprises the following steps: impregnating glass fiber roving in resin glue solution to obtain the resin glue solution impregnated roving; sequentially laminating a knitted felt, the resin glue solution impregnated twistless roving and the wood grain composite felt, performing by using a preforming die, and curing by using a tractor to enter the die to obtain a wood grain glass fiber reinforced plastic pultrusion section; the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate. The invention adopts one-step forming to prepare the glass fiber reinforced plastic pultruded profile with a similar wood grain surface, thereby avoiding the generation of microcracks; the compound curing agent can realize medium-temperature rapid pultrusion, reduce energy consumption and improve the production efficiency of products.
Description
Technical Field
The invention relates to the technical field of glass fiber reinforced plastic preparation, in particular to a preparation method of a wood grain glass fiber reinforced plastic pultrusion section.
Background
The glass fiber reinforced plastic is one of composite materials, and has been widely applied in the related industries of aerospace, railway, decorative building, home furniture, advertisement display, craft gift, building material bathroom, yacht berth ship, sports material, environmental sanitation engineering and the like due to the performance advantages of light weight, high strength, corrosion resistance and the like, and is highly praised.
At present, the glass fiber reinforced plastic section bar is formed by pultrusion mostly, the color of the surface of the section bar is changed by adding pigment paste, but the surface of the produced section bar is generally uniform, patterns similar to wood grains cannot be realized, microcracks are easy to appear on the surface of a product, particularly, the product with a large plane can be layered and shelled by serious people.
The traditional pultrusion process adopts a single curing agent for production, has low production efficiency and high energy consumption, and restricts industrial application.
Disclosure of Invention
The invention aims to provide a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, which adopts one-step forming to prepare the glass fiber reinforced plastic pultrusion section with a similar wood grain surface, thereby avoiding the generation of microcracks; the compound curing agent can realize medium-temperature rapid pultrusion, reduce energy consumption and improve the production efficiency of products.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, which comprises the following steps:
impregnating glass fiber roving in resin glue solution to obtain the resin glue solution impregnated roving;
sequentially laminating a knitted felt, the resin glue solution impregnated twistless roving and the wood grain composite felt, performing by using a preforming die, and curing by using a tractor to enter the die to obtain a wood grain glass fiber reinforced plastic pultrusion section;
the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate.
Preferably, the resin system comprises one or more of ortho-benzene resin, meta-benzene resin and vinyl resin and saturated polyester.
Preferably, the raw materials for preparing the resin glue solution further comprise a functional filler, and the functional filler comprises aluminum hydroxide and/or calcium carbonate.
Preferably, the internal mold release agent is zinc stearate or mold release oil.
Preferably, the preparation raw materials of the resin glue solution comprise, by weight, 100 parts of a resin system, 0.1-0.5 part of benzoyl peroxide, 0.8-1.3 parts of tert-butyl peroxybenzoate, 0-30 parts of a functional filler, 0.8-1.5 parts of polyethylene micro powder, 0.5-2 parts of an auxiliary agent and 2 parts of an internal mold release agent.
Preferably, the wood grain composite felt comprises a glass fiber short fiber layer and a wood grain surface felt which are sequentially arranged in a laminated manner, and polyester yarns for sewing the glass fiber short fiber layer and the wood grain surface felt; one side with patterns of the wood grain surface felt is arranged on the outer side of the wood grain glass fiber reinforced plastic pultrusion section; and the glass fiber short fiber layer is contacted with the twistless roving impregnated with the resin glue solution.
Preferably, the gram weight of the wood grain composite felt is 300-600 g/m2。
Preferably, the specification of the glass fiber twistless roving is 2400-9600 tex.
Preferably, the gram weight of the knitted felt is 300-450 g/m2。
Preferably, the curing comprises preheating, gelling and forming in sequence; the preheating temperature is 90-105 ℃, the gelling temperature is 115-135 ℃, and the forming temperature is 110-125 ℃.
The invention provides a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, which comprises the following steps: impregnating glass fiber roving in resin glue solution to obtain the resin glue solution impregnated roving; sequentially laminating a knitted felt, the resin glue solution impregnated twistless roving and the wood grain composite felt, performing by using a preforming die, and curing by using a tractor to enter the die to obtain a wood grain glass fiber reinforced plastic pultrusion section; the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate. The wood grain fiber reinforced plastic is prepared by integrally molding the wood grain composite felt, the knitted felt and the twistless roving impregnated with the resin glue solution, and the pultruded profile has excellent weather resistance and corrosion resistance, is not rusty and is easy to clean. The surface pattern has the effects of wood imitation and antique imitation, and the surface effect of smoothness and beauty can be obtained without secondary spraying; the invention adopts the compound curing agent consisting of benzoyl peroxide and tert-butyl peroxybenzoate, can realize lower-temperature curing molding, reduces energy consumption and saves energy in molding; meanwhile, the compounded curing system can realize synergistic effect and improve the reaction efficiency, thereby improving the pultrusion speed and efficiency.
Drawings
FIG. 1 is a flow chart of a process for preparing a wood grain composite mat according to an embodiment of the present invention;
FIG. 2 is a schematic view of an apparatus for making a wood grain composite mat according to an embodiment of the present invention;
FIG. 3 is a flow chart of the preparation process of the wood grain glass fiber reinforced plastic pultruded profile according to the embodiment of the present invention.
Detailed Description
The invention provides a preparation method of a wood grain glass fiber reinforced plastic pultrusion section, which comprises the following steps:
impregnating glass fiber roving in resin glue solution to obtain the resin glue solution impregnated roving;
sequentially laminating a knitted felt, the resin glue solution impregnated twistless roving and the wood grain composite felt, performing by using a preforming die, and curing by using a tractor to enter the die to obtain a wood grain glass fiber reinforced plastic pultrusion section;
the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate.
In the present invention, the starting materials used in the present invention are commercially available products known to those skilled in the art unless otherwise specified.
The invention soaks the glass fiber roving in the resin glue solution to obtain the resin glue solution-soaked roving. In the invention, the specification of the glass fiber twistless roving is preferably 2400-9600 tex, and more preferably 2400tex or 4400 tex. In the present invention, the producer of the glass fiber twistless roving is preferably boulder group limited. In the invention, the impregnation is preferably carried out in a dipping tank, and the invention has no special requirements on the specific process parameters of the impregnation and can adopt an impregnation process well known to those skilled in the art.
In the invention, the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate. The resin glue solution is prepared from the following raw materials, by weight, 100 parts of a resin system, 0.1-0.5 part of benzoyl peroxide, 0.8-1.3 parts of tert-butyl peroxybenzoate, 0-30 parts of a functional filler, 0.8-1.5 parts of polyethylene micro powder, 0.5-2 parts of an auxiliary agent and 2 parts of an internal mold release agent.
The preparation raw materials of the resin glue solution preferably comprise 100 parts of a resin system in parts by weight. In the invention, the resin system preferably comprises one or more of o-benzene resin, m-benzene resin and vinyl resin and saturated polyester; in a specific embodiment of the invention, when the resin system is a mixture of a m-benzene resin and a saturated polyester, the mass ratio of the m-benzene resin to the saturated polyester is preferably 7-9: 1 to 3, more preferably 7.5 to 8: 2 to 2.5; when the resin system is a mixture of a vinyl resin and a saturated polyester, the mass ratio of the vinyl resin to the saturated polyester is preferably 19: 1. in the invention, the resin system can improve the weather resistance and the corrosion resistance of the glass fiber reinforced plastic profile.
Based on the weight part of the resin system, the preparation raw material of the resin glue solution preferably comprises 0.1-0.5 part of benzoyl peroxide, and more preferably 0.2-0.3 part of benzoyl peroxide.
Based on the weight parts of the resin system, the preparation raw material of the resin glue solution preferably comprises 0.8-1.3 parts of tert-butyl peroxybenzoate, and more preferably 0.9-1.1 parts.
The invention adopts the compound curing agent consisting of benzoyl peroxide and tert-butyl peroxybenzoate, can realize lower-temperature curing molding, reduces energy consumption and saves energy in molding; meanwhile, the compounded curing system can realize synergistic effect and improve the reaction efficiency, thereby improving the pultrusion speed and efficiency.
On the basis of the weight portion of the resin system, the preparation raw material of the resin glue solution preferably comprises 0-30 parts of functional filler, and more preferably 5-10 parts. In the present invention, the functional filler preferably includes aluminum hydroxide and/or calcium carbonate. In the present invention, when the functional filler is a mixture of aluminum hydroxide and calcium carbonate, the mass ratio of the aluminum hydroxide and the calcium carbonate is preferably 1: 1. in the specific embodiment of the invention, the aluminum hydroxide has the flame retardant effect, so that the flame retardant property and the rigidity of the product can be improved, and the porosity of the product is reduced; calcium carbonate can reduce cost, increase product stiffness, and reduce product porosity.
Based on the weight parts of the resin system, the preparation raw material of the resin glue solution preferably comprises 0.8-1.5 parts of polyethylene micro powder, and more preferably 0.9-1 part. In the present invention, the particle size of the polyethylene fine powder is preferably 12 to 22 μm. In the invention, the polyethylene micro powder can reduce the shrinkage rate of the product, improve the surface brightness of the product, increase the toughness of the product and reduce surface microcracks.
On the basis of the weight portion of the resin system, the preparation raw material of the resin glue solution preferably comprises 0.5-2 parts of an auxiliary agent, and more preferably 1-1.8 parts. In the present invention, the auxiliary agent is preferably a wetting agent and a dispersing agent, and particularly preferably W9010 of bick chemical.
The preparation raw material of the resin glue solution preferably comprises 2 parts of internal release agent by weight of the resin system. In the present invention, the internal mold release agent is preferably zinc stearate or mold release oil.
In the present invention, the preparation method of the resin glue solution preferably includes: and mixing the prepared raw materials to obtain a resin glue solution. The present invention does not require any particular method of mixing, and mixing methods known to those skilled in the art may be used.
The invention has no special limitation on the dosage ratio of the glass fiber roving and the resin glue solution, and is suitable for completely soaking the glass fiber roving by the resin glue solution.
After obtaining the twistless roving impregnated with the resin glue solution, the invention sequentially laminates the knitted felt, the twistless roving impregnated with the resin glue solution and the wood grain composite felt, performs the twistless roving impregnated with the resin glue solution by a preforming die, and enters a die for curing by the traction of a tractor to obtain the wood grain glass fiber reinforced plastic pultrusion section.
In the invention, the knitted felt is preferably a glass fiber knitted felt, and the gram weight of the knitted felt is preferably 300-450 g/m2More preferably 380g/m2. In the invention, the function of the knitted felt is to prevent the inner surface from cracking and increase the flatness of the inner surface of the product.
In the invention, the gram weight of the wood grain composite felt is preferably 300-800 g/m2More preferably 330 to 650g/m2. In the present invention, the wood grain composite felt preferably comprises a laminated arrangement in sequenceThe glass fiber short fiber layer and the wood grain surface felt, and polyester yarns for sewing the glass fiber short fiber layer and the wood grain surface felt; one side with patterns of the wood grain surface felt is arranged on the outer side of the wood grain glass fiber reinforced plastic pultrusion section; and the glass fiber short fiber layer is contacted with the twistless roving impregnated with the resin glue solution. The glass fiber reinforced plastic profile is prepared by adopting the wood grain composite felt, so that the temperature resistance of the glass fiber reinforced plastic profile can be improved, the color of the product is not faded, and the glass fiber reinforced plastic profile is provided with wood grain patterns without secondary processing.
In the present invention, the preparation method of the wood grain composite felt preferably comprises the following steps:
chopping the glass fiber twistless roving to obtain glass fiber chopped fibers;
settling the glass fiber short fibers to obtain a glass fiber short fiber layer;
sequentially laminating the glass fiber short fiber layer and the wood grain surface felt, and sewing by using polyester yarns to obtain a wood grain composite felt; one side with patterns of the wood grain surface felt is arranged on the outer side of the wood grain composite felt.
In the invention, the glass fiber roving is preferably chopped to obtain the glass fiber chopped fiber. In the invention, the specification of the glass fiber twistless roving is preferably 800-4800 tex, and is particularly preferably 800tex, 1200tex, 2400tex or 4800 tex; the manufacturer of the glass fiber twistless roving is preferably megalite group company or Chongqing Tri-epitaxial glass fiber company Limited.
In the present invention, the chopping is preferably performed in a chopping roll of a stitch-knitting machine. In the present invention, the length of the glass fiber staple fiber is preferably 50 to 100 mm. In the specific embodiment of the invention, the rotating speed of the chopping roller is preferably 20-100 rev/min, and more preferably 50-60 rev/min; the speed of the stitch-knitting machine is preferably 400-1200 rev/min, and more preferably 600-1000 rev/min. The invention can control the gram weight of the unit area of the glass fiber staple fibers and improve the production efficiency by controlling the rotating speed of the chopping roller and the speed of the stitch-knitting machine.
After obtaining the glass fiber short fiber, the invention preferably settles the glass fiber short fiber to obtain the glass fiber short fiber layer. In the present invention, the sedimentation is preferably free fall sedimentation, which is preferably carried out in a sedimentation chamber.
In the present invention, the thickness of the glass fiber short fiber layer is preferably 0.1 to 2mm, more preferably 0.3 to 1.5mm, and further preferably 0.4 to 0.6 mm.
In the invention, the gram weight of the unit area of the glass fiber chopped fiber layer is preferably 250-800 g/m2More preferably 300 to 450g/m2。
After the glass fiber short fiber layer is obtained, the glass fiber short fiber layer and the wood grain surface felt are preferably arranged in a laminated mode in sequence, and the polyester yarns are utilized for sewing to obtain the wood grain composite felt; one side with patterns of the wood grain surface felt is arranged on the outer side of the wood grain composite felt. In the invention, the material of the wood grain surface felt is preferably polyester, and the polyester is particularly preferably polyethylene terephthalate (PET); the number average molecular weight of the polyester is preferably 14000 to 16500, and more preferably 14500 to 16000. In the invention, the specification of the wood grain surface felt is preferably 20-100 g/m2More preferably 20g/m2、30g/m2、45g/m2、50g/m2、60g/m2、80g/m2Or 100g/m2. In the invention, the thickness of the wood grain surface felt is preferably 0.05-0.8 mm, more preferably 0.1-0.6 mm, and even more preferably 0.2-0.4 mm. The invention adopts the polyester wood grain surface felt, can improve the tear resistance of the wood grain composite felt, and improve the microcrack on the surface of the glass fiber reinforced plastic section, so that the glass fiber reinforced plastic section is not layered and cracked.
In the present invention, the wood grain surfacing mat is preferably fed to the stitching via tension rollers. In the invention, the tension of the tension roller is preferably 0.05MPa, and the tension degree of the wood grain surface felt is controlled by the tension of the tension roller, so that the strength of the wood grain composite felt is influenced.
In the present invention, the fineness of the polyester yarn is preferably 100D and 150D; the breaking strength is preferably > 3.0 CN/dtex. According to the invention, the wood grain surface felt and the glass fiber short fiber layer are sewn through the polyester yarns, so that the tensile strength of the wood grain composite felt is improved, and the interlayer peeling strength and the surface cracking resistance of a glass fiber reinforced plastic finished product are improved. In the specific embodiment of the invention, the polyester yarns are preferably warped and wound on the pan head for standby, so that the polyester yarns are convenient to use in later sewing operation.
In the present invention, the suture is preferably made by a warp flat tissue or a pillar stitch; the stitch of the sewing is preferably 1.5-5.0 mm, more preferably 2.6-4.2 mm, and even more preferably 2.8-3.5 mm. In the invention, the sewing stitches determine the tightness degree of the glass fiber short fiber layer and the wood grain surface felt, and the sewing stitches are controlled in the range, so that on one hand, the resin infiltration speed can be improved in the pultrusion process, and the production efficiency is improved; on the other hand, the chopped yarns can be prevented from falling off, and the tensile strength of the wood grain composite felt is improved.
The invention preferably sequentially cuts, draws and rolls the sewed composite felt to obtain the wood grain composite felt finished product. The invention has no special requirements on the specific process parameters of slitting, drawing and rolling, and can adopt the process known by the technical personnel in the field.
In the invention, the knitted felt, the twistless roving impregnated with the resin glue solution and the wood grain composite felt are sequentially laminated and preformed by a preforming die. The invention leads the knitting felt, the twistless roving dipped with the resin glue solution and the wood grain composite felt to be pre-arranged according to the preset product shape before formally entering the mould through pre-forming, and gradually approaches the shape of the mould cavity in the mould so as to be convenient for smoothly entering the mould cavity.
After preforming, the wood grain glass fiber reinforced plastic pultrusion section is obtained by drawing the wood grain glass fiber reinforced plastic into a die through a tractor for curing. In the present invention, the curing preferably includes preheating, gelling, and molding in this order; the preheating temperature is preferably 90-105 ℃, and more preferably 95-100 ℃; the gelling temperature is preferably 115-135 ℃, and more preferably 120-130 ℃; the molding temperature is preferably 110-125 ℃, and more preferably 115-120 ℃.
As an embodiment of the invention, the mould comprises a preheating zone, a gel zone and a curing zone which are connected in sequence, the mould is heated firstly, so that the temperature of the preheating zone reaches the preheating temperature, the temperature of the gel zone reaches the gelling temperature, and after the temperature of the curing zone reaches the forming temperature, the preformed material is drawn into the mould to be sequentially preheated, gelled and formed.
In the curing process, the peroxide curing agent is decomposed to generate free radicals to open double bonds in the resin, so that chain type crosslinking reaction is initiated, and the integrally formed wood grain glass fiber reinforced plastic section is obtained.
According to the invention, after the solidification is finished, the wood grain glass fiber reinforced plastic profile is preferably pulled out by utilizing the traction action of a traction machine. In the invention, the pulling speed is preferably 0.3-0.6 m/min.
In the invention, the glass fiber reinforced plastic pultrusion section comprises a knitting felt layer, a glass fiber untwisted roving layer and a wood grain composite felt which are sequentially laminated. In the invention, the thickness of the knitting felt layer is preferably 0.5-1 mm, the thickness of the glass fiber untwisted roving layer is preferably 1-3 mm, and the thickness of the wood grain composite felt is preferably 0.5-1 mm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples 1 to 5
The wood grain composite felt is prepared according to the preparation process shown in the figure 1 by adopting the equipment shown in the figure 2. Penetrating glass fiber roving into a yarn guide tube, guiding the glass fiber roving to a short-cut roller, carrying out short-cut on the glass fiber roving through the short-cut roller to obtain glass fiber short fibers, carrying out free falling type sedimentation in a sedimentation chamber, descending onto a conveying belt to form a glass fiber short fiber layer, and conveying the glass fiber short fiber layer to a sewing region through the conveying belt;
guiding the warped polyester yarns to a sewing needle through a yarn guide roller;
guiding the wood grain polyester surface felt to a sewing position through a tension roller and a guide roller;
adjusting the number of glass fiber twistless rovings, setting the rotating speed of a short cutting roller, the vehicle speed, the tension of a tension roller and sewing stitches;
starting a vehicle speed, a chopping roller and a sewing linkage button, sewing the glass fiber chopped fiber layer and the wood grain polyester surface felt through polyester yarns, and slitting the sewn wood grain composite felt through a slitting device;
and (5) rolling and packaging, and rolling by leading in a rolling position through a traction roller to obtain the wood grain composite felt.
The process parameters during the preparation of the wood grain composite felt are shown in table 1.
The wood grain glass fiber reinforced plastic pultruded profile was prepared according to the preparation process shown in fig. 3. Impregnating glass fiber roving in resin glue solution (the specific formula is shown in table 2) to obtain the resin glue solution impregnated roving; sequentially laminating the knitted felt, the resin glue solution impregnated untwisted roving and the wood grain composite felt in a preforming die, putting the knitted felt, the resin glue solution impregnated untwisted roving and the wood grain composite felt into a heated metal die for reaction and solidification, and drawing out the die by the traction of a traction machine to obtain a wood grain glass fiber reinforced plastic pultrusion section; the technological parameters in the preparation process of the wood grain glass fiber reinforced plastic pultrusion section are shown in the table 2.
TABLE 1 Process parameters for preparing wood grain composite felt in examples 1-5
TABLE 2 examples 1-5 Process parameters for preparing wood grain fiberglass pultruded profiles
The performance test results of the glass fiber reinforced plastic pultruded profiles prepared in examples 1-5 are shown in Table 3.
Table 3 results of performance test of examples 1 to 5
As can be seen from Table 3, the wood grain composite felt is applied to the pultrusion process, can be tightly combined with continuous fibers in the profile forming process and then becomes a whole after being cured, and the surface cracking tendency can be effectively reduced when being impacted by external force because the tensile breaking strength of the wood grain composite felt is higher than that of a pure knitted felt and the elongation of the wood grain surface felt is higher than that of a glass fiber knitted felt.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the wood grain glass fiber reinforced plastic pultrusion section is characterized by comprising the following steps:
impregnating glass fiber roving in resin glue solution to obtain the resin glue solution impregnated roving;
sequentially laminating a knitted felt, the resin glue solution impregnated twistless roving and the wood grain composite felt, performing by using a preforming die, and curing by using a tractor to enter the die to obtain a wood grain glass fiber reinforced plastic pultrusion section;
the preparation raw materials of the resin glue solution comprise a resin system, a curing agent, polyethylene micro powder, an auxiliary agent and an internal release agent; the curing agent is a mixture of benzoyl peroxide and tert-butyl peroxybenzoate.
2. The method according to claim 1, wherein the resin system comprises one or more of ortho-benzene resin, meta-benzene resin and vinyl resin, and saturated polyester.
3. The preparation method according to claim 1, wherein the raw material for preparing the resin glue solution further comprises a functional filler, and the functional filler comprises aluminum hydroxide and/or calcium carbonate.
4. The production method according to claim 1, wherein the internal mold release agent is zinc stearate or mold release oil.
5. The preparation method according to any one of claims 1 to 4, characterized in that the resin glue solution is prepared from 100 parts by weight of a resin system, 0.1 to 0.5 part by weight of benzoyl peroxide, 0.8 to 1.3 parts by weight of tert-butyl peroxybenzoate, 0 to 30 parts by weight of a functional filler, 0.8 to 1.5 parts by weight of polyethylene micropowder, 0.5 to 2 parts by weight of an auxiliary agent and 2 parts by weight of an internal mold release agent.
6. The preparation method according to claim 1, wherein the wood grain composite felt comprises a glass fiber short fiber layer and a wood grain surface felt which are sequentially laminated, and polyester yarns for sewing the glass fiber short fiber layer and the wood grain surface felt; one side with patterns of the wood grain surface felt is arranged on the outer side of the wood grain glass fiber reinforced plastic pultrusion section; and the glass fiber short fiber layer is contacted with the twistless roving impregnated with the resin glue solution.
7. The preparation method of claim 1 or 6, wherein the gram weight of the wood grain composite felt is 300-600 g/m2。
8. The method of claim 1, wherein the glass roving has a gauge of 2400 to 9600 tex.
9. The method of claim 1, wherein the method comprisesThe gram weight of the knitted felt is 300-450 g/m2。
10. The production method according to claim 1, the curing comprising preheating, gelling, and molding in this order; the preheating temperature is 90-105 ℃, the gelling temperature is 115-135 ℃, and the forming temperature is 110-125 ℃.
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