CN106977816B - Halogen-free flame-retardant hybrid fiber yarn fabric laminated board and preparation method thereof - Google Patents
Halogen-free flame-retardant hybrid fiber yarn fabric laminated board and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a halogen-free flame-retardant hybrid fiber yarn fabric laminated board and a preparation method thereof, the laminated board is obtained by alternately laminating hybrid fiber yarn fabric and polypropylene halogen-free flame-retardant sheets, the outermost layer of the laminated board is a polypropylene halogen-free flame-retardant sheet, and the ratio of the hybrid fiber yarn fabric to the polypropylene halogen-free flame-retardant sheet is 1: 1 or 2: 1, alternately laminating, and preparing the laminated plate by adopting a hot-press forming process. Compared with the prior art, the invention restrains the 'wick effect' and has excellent dimensional stability and mechanical property.
Description
Technical Field
The invention relates to the field of flame retardance, in particular to a halogen-free flame-retardant mixed fiber yarn fabric laminated board and a preparation method thereof.
Background
At present, flame-retardant unidirectional prepreg tapes are sought in flame-retardant modified engineering plastics. Because the impregnation process of the unidirectional prepreg tape is simple, the unidirectional mechanical property is high. Flame retardant processes of unidirectional prepreg tapes are mainly classified into two categories: 1. the flame-retardant modified material is melted and impregnated into the glass fiber monofilament, so that the flame-retardant performance is good, and the wick effect is solved. 2. The glass fiber monofilaments are melted and impregnated by pure resin, the obtained unidirectional prepreg tape is laminated with the flame-retardant resin sheet for hot press molding, the mechanical property is good, and the flame retardant is prevented from directly contacting the surfaces of the glass fibers. There is a coating technique that uses a modifier to coat the impregnated glass fibers, and chinese patent CN 102643478A, CN 105061896 a discloses such a method. Although the unidirectional prepreg tape has simple process and high mechanical property, the unidirectional prepreg tape has large difference of mechanical property in a plane, and a laminated plate prepared by transversely and longitudinally crossed lamination of the unidirectional prepreg tape has poor interlaminar shear resistance. The reinforcing fibers of the single-layer unidirectional prepreg tape in the laminated plate are bonded by resin, and the dimensional stability is poor.
The disadvantages of the unidirectional prepreg tape can be solved by the glass fiber fabric structure, but the fiber yarn bundles in the fabric are compact and difficult to impregnate. Chinese patent CN 102850648A firstly fully melts and impregnates the glass fiber cloth in an impregnation tank with resin at 250 ℃, and then compounds the glass fiber cloth with a flame-retardant polypropylene flow-extending layer in a hot-pressing way after impregnation, but the flame-retardant performance is poor, and the oxygen index is low (only 26% at most).
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a halogen-free flame retardant hybrid yarn fabric laminate having excellent dimensional stability and mechanical properties while suppressing the "wicking effect".
The purpose of the invention can be realized by the following technical scheme:
a halogen-free flame-retardant mixed fiber yarn fabric laminated board is obtained by alternately laminating mixed fiber yarn fabric and polypropylene halogen-free flame-retardant sheets,
the outermost layer of the laminated plate is a polypropylene halogen-free flame-retardant sheet, and the mixed fiber yarn fabric and the polypropylene halogen-free flame-retardant sheet are mixed according to the weight ratio of 1: 1 or 2: 1 are in alternating stacks.
The polypropylene halogen-free flame-retardant sheet is prepared from the following raw materials in parts by weight:
50-80 parts of polypropylene resin, 20-40 parts of halogen-free flame retardant system, 0.2-0.6 part of antioxidant, 0-1 part of compatilizer and 0.5-1 part of processing aid.
The halogen-free flame retardant system is a P-N halogen-free flame retardant system and is obtained by mixing an acid source, a carbon source and a gas source according to the ratio of 50-70:5-20: 10-45. The intumescent P-N halogen-free flame retardant system is adopted, the carbon forming property is good, the flame retardant efficiency is high, the mixed yarn fabric structure of the glass fiber and the matrix resin fiber is adopted, the impregnation is sufficient, and the size stability and the mechanical property are excellent.
The acid source is ammonium polyphosphate with polymerization degree of 1000-2800,
the carbon source is one or more of caged phosphate, caged phosphate oligomer, pentaerythritol oligomer or polyhydroxy compound,
the gas source is one or more of melamine, melamine polyphosphate and melamine cyanurate.
The antioxidant is one or more of hindered phenol antioxidant, phosphite antioxidant or organic sulfur antioxidant, including antioxidant 246, antioxidant 264, antioxidant 1010, antioxidant 1076 or antioxidant 168,
the compatilizer is selected from one or more of acrylic acid, acrylic ester, methacrylate, acrylonitrile or maleic anhydride,
the processing aid is selected from one or more of a plasticizer, a nucleating agent, a lubricant, a release agent, a light stabilizer, a pigment or a dye.
The mixed fiber yarn fabric is plain cloth or twill cloth which is formed by alternately weaving glass fiber and polypropylene fiber according to a ratio of 40-60:60-40, and the mixed fiber yarn fabric is of a wrapped yarn structure, wherein the core yarn is the glass fiber, and the wrapping layer is the polypropylene fiber.
The layers of the mixed fiber yarn fabrics are laid in parallel according to the fiber orientation or laid at multiple angles of 30 degrees, 45 degrees and the like according to the fiber orientation.
The forming process adopts the laminating and hot-pressing compounding of the fabric structure enhancement layer and the polypropylene flame-retardant sheet layer, avoids the direct contact of the flame retardant with the glass fiber, and specifically adopts the following steps:
(1) the polypropylene halogen-free flame-retardant sheet material is prepared from the following components in parts by weight:
uniformly mixing the components in a high-speed mixer, carrying out twin-screw melting, mixing, extruding, cooling, drying and granulating to obtain polypropylene halogen-free flame-retardant granules, and finally carrying out hot pressing on the polypropylene halogen-free flame-retardant granules to obtain a polypropylene halogen-free flame-retardant sheet with the thickness of 0.4-0.8 mm;
(2) and (3) placing the polypropylene halogen-free flame-retardant sheet and the mixed fiber yarn fabric into a mold cavity for laminating, hot-pressing and composite forming, or firstly hot-pressing the mixed fiber yarn fabric into a hard sheet, then placing the hard sheet and the polypropylene halogen-free flame-retardant sheet into the mold cavity for laminating, hot-pressing and composite forming, so as to obtain the halogen-free flame-retardant mixed fiber yarn fabric laminated plate.
When the hot-pressing composite molding is carried out in the step (2), the preheating pressure is 0.5MPa to 2MPa, the preheating temperature is 190 ℃ to 230 ℃, the preheating time is 20s to 60s, the pressure maintaining pressure is 3MPa to 16MPa, the pressure maintaining temperature is 190 ℃ to 230 ℃, the pressure maintaining time is 40s to 180s, the cold pressing pressure is 3MPa to 16MPa, the cold pressing temperature is 10 ℃ to 40 ℃, the cold pressing time is 180s to 300s, the thickness of a die cavity is 0.2mm to 0.6mm larger than that of the halogen-free flame-retardant mixed fiber yarn fabric laminated board, the glass fiber can be prevented from being crushed under overhigh pressure, and the generation of internal stress is.
Compared with the prior art, the invention has the following advantages:
(1) the intumescent flame retardant is used as a halogen-free flame retardant system, the addition amount is small, the carbon forming property is good, the flame retardant efficiency is high, and the wick effect is restrained; the limit oxygen index (%) of the finally prepared halogen-free flame-retardant mixed fiber yarn fabric laminated board can reach more than 33 and can reach 37 at most.
(2) The mixed yarn fabric structure of the glass fiber and the matrix resin fiber is adopted, so that the fabric is fully impregnated and has excellent dimensional stability and mechanical property;
(3) the laminated forming process is adopted to laminate the fabric structure reinforcing layer and the polypropylene flame-retardant sheet material layer for hot-pressing compounding, the process is simple, and the flame retardant is prevented from directly contacting the glass fiber.
(4) The mold cavity with the thickness slightly larger than the thickness of the plate by 0.2-0.4 mm is adopted, so that the glass fiber can be prevented from being crushed by overhigh pressure, and the generation of internal stress is avoided.
Drawings
FIG. 1 is a schematic representation of the construction of the fabric of hybrid yarn of example 1;
FIG. 2 is a schematic structural view of a halogen-free flame-retardant hybrid yarn fabric laminate of example 1;
FIG. 3 is a schematic structural view of a halogen-free flame-retardant hybrid yarn fabric laminate of example 2;
fig. 4 is a schematic structural view of the halogen-free flame-retardant hybrid yarn fabric laminate of example 3.
In the figure, 1-mixed fiber yarn fabric and 2-polypropylene halogen-free flame-retardant sheet material.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The preparation of the polypropylene halogen-free flame-retardant sheet comprises the following components in percentage by weight:
wherein, the halogen-free flame retardant system is as follows: ammonium polyphosphate (polymerization degree 1200), caged phosphate and melamine phosphate were as follows: 6: 8 proportion. The antioxidant is 1010, and the compatilizer is titanate coupling agent
Weighing the components in the content, uniformly mixing in a high-speed mixer, and then feeding the mixture into a double-screw extruder for melt blending plastication, wherein the frequency of a main machine is 22Hz, and the temperatures of the double-screw extruder from a machine head to a feeding port are 185 ℃, 180 ℃, 175 ℃ and 155 ℃. The extruded and granulated pellets are dried in a vacuum oven at 55 ℃ for 1h, and the moisture content is lower than 0.02 percent. And (3) hot-pressing the dried granules into a sheet in a hot press, wherein the thickness of the sheet is 0.6mm, and the hot-pressing parameters are as follows: preheating pressure of 2MPa, preheating temperature of 190 ℃, preheating time of 10s, holding pressure of 5MPa, holding temperature of 190 ℃, holding time of 40s, cold pressing pressure of 5MPa, cold pressing temperature of 18 ℃ and cold pressing time of 60s to obtain the polypropylene halogen-free flame-retardant sheet.
Preparation of GF/PP hybrid yarn fabric sheet: and (3) moving the GF/PP hybrid yarn fabric to a hot press according to the laminating mode of figure 1, and carrying out hot pressing and curing to obtain a sheet. Hot pressing parameters were set as: preheating pressure of 2MPa, preheating temperature of 200 ℃, preheating time of 20s, pressure maintaining pressure of 5MPa, pressure maintaining temperature of 200 ℃, pressure maintaining time of 50s, cold pressing pressure of 5MPa, cold pressing temperature of 18 ℃ and cold pressing time of 70s to obtain the mixed fiber yarn fabric 1.
Preparing a halogen-free flame-retardant GF/PP mixed fiber yarn fabric laminated plate: laminating and hot-pressing the polypropylene halogen-free flame-retardant sheet 2 and the mixed fiber yarn fabric 1 according to the mode of figure 2, wherein the hot-pressing parameters are set as follows: preheating pressure of 1MPa, preheating temperature of 200 ℃, preheating time of 40s, pressure maintaining pressure of 5MPa, pressure maintaining temperature of 200 ℃, pressure maintaining time of 120s, cold pressing pressure of 5MPa, cold pressing temperature of 18 ℃ and cold pressing time of 180 s.
Example 2
The preparation of the polypropylene halogen-free flame-retardant sheet comprises the following components in percentage by weight:
wherein, the halogen-free flame retardant system is ammonium polyphosphate (polymerization degree 2000), pentaerythritol oligomer and melamine cyanurate according to the weight ratio of 6: 1: 2, antioxidant 1010 and compatilizer which is silane coupling agent
Weighing the components in the content, uniformly mixing in a high-speed mixer, and then feeding the mixture into a double-screw extruder for melt blending plastication, wherein the frequency of a main machine is 24Hz, and the temperatures of the double-screw extruder from a machine head to a feeding port are 185 ℃, 180 ℃, 175 ℃ and 155 ℃. The extruded and granulated pellets are dried in a vacuum oven at 55 ℃ for 1h, and the moisture content is lower than 0.02 percent. And (3) hot-pressing the dried granules into a sheet in a hot press, wherein the thickness of the sheet is 0.5mm, and the hot-pressing parameters are as follows: preheating pressure of 2MPa, preheating temperature of 190 ℃, preheating time of 10s, pressure maintaining pressure of 5MPa, pressure maintaining temperature of 190 ℃, pressure maintaining time of 40s, cold pressing pressure of 5MPa, cold pressing temperature of 18 ℃ and cold pressing time of 60 s.
Preparing a halogen-free flame-retardant GF/PP mixed fiber yarn fabric laminated plate: laminating and hot-pressing the polypropylene halogen-free flame-retardant sheet 2 and the mixed fiber yarn fabric 1 according to the mode of figure 3, wherein the hot-pressing parameters are set as follows: preheating pressure of 1MPa, preheating temperature of 230 ℃, preheating time of 60s, pressure maintaining pressure of 6MPa, pressure maintaining temperature of 230 ℃, pressure maintaining time of 180s, cold pressing pressure of 6MPa, cold pressing temperature of 18 ℃ and cold pressing time of 240 s.
Example 3
The preparation of the polypropylene halogen-free flame-retardant sheet comprises the following components in percentage by weight:
wherein, the halogen-free flame retardant system is ammonium polyphosphate (polymerization degree 1200), cage-shaped phosphate ester oligomer and melamine cyanurate according to the weight ratio of 5: 1: 4, antioxidant 168 and silane coupling agent.
Weighing the components in the content, uniformly mixing in a high-speed mixer, and then feeding the mixture into a double-screw extruder for melt blending plastication, wherein the frequency of a main machine is 24Hz, and the temperatures of the double-screw extruder from a machine head to a feeding port are 185 ℃, 180 ℃, 175 ℃ and 155 ℃. The extruded and granulated pellets are dried in a vacuum oven at 55 ℃ for 1h, and the moisture content is lower than 0.02 percent. And (3) hot-pressing the dried granules in a hot press to form a sheet, wherein the thickness of the sheet is 0.45mm, and the hot-pressing parameters are as follows: preheating pressure of 2MPa, preheating temperature of 190 ℃, preheating time of 10s, pressure maintaining pressure of 5MPa, pressure maintaining temperature of 190 ℃, pressure maintaining time of 40s, cold pressing pressure of 5MPa, cold pressing temperature of 18 ℃ and cold pressing time of 60 s.
Preparing a halogen-free flame-retardant GF/PP mixed fiber yarn fabric laminated plate: laminating and hot-pressing the polypropylene halogen-free flame-retardant sheet 2 and the mixed fiber yarn fabric 1 according to the mode of figure 4, wherein the hot-pressing parameters are set as follows: preheating pressure of 1MPa, preheating temperature of 220 ℃, preheating time of 60s, pressure maintaining pressure of 6MPa, pressure maintaining temperature of 220 ℃, pressure maintaining time of 180s, cold pressing pressure of 6MPa, cold pressing temperature of 18 ℃ and cold pressing time of 240 s.
The prepared halogen-free flame-retardant GF/PP mixed fiber yarn laminated board is prepared into a standard sample strip according to the GB standard size, and the performance of the sample strip is detected, wherein the result is shown in Table 1.
TABLE 1
| Performance of | Example 1 | Example 2 | Example 3 |
| Izod notched impact Strength (KJ/m)2) | 99 | 105 | 113 |
| Tensile Strength (MPa) | 155 | 155 | 102 |
| Modulus of elasticity in tension (MPa) | 8500 | 8500 | 6600 |
| Flexural Strength (MPa) | 163 | 175 | 118 |
| Flexural modulus of elasticity (MPa) | 5400 | 6800 | 4900 |
| Limiting oxygen index (%) | 35.6 | 33.6 | 37.1 |
| UL94 vertical Combustion | V-0 | V-1 | V-0 |
Example 4
The halogen-free flame-retardant hybrid fiber yarn fabric laminated board is obtained by alternately laminating hybrid fiber yarn fabrics and polypropylene halogen-free flame-retardant sheets, wherein the outermost layer of the laminated board is the polypropylene halogen-free flame-retardant sheet, and the ratio of the hybrid fiber yarn fabrics to the polypropylene halogen-free flame-retardant sheets is 1: 1 are alternately stacked.
The polypropylene halogen-free flame-retardant sheet is prepared from the following raw materials in parts by weight:
50 parts of polypropylene resin, 40 parts of halogen-free flame retardant system, 0.2 part of antioxidant and 0.5 part of processing aid.
The halogen-free flame retardant system is a P-N halogen-free flame retardant system and is obtained by mixing an acid source, a carbon source and a gas source according to the ratio of 50:5: 45. The intumescent P-N halogen-free flame retardant system is adopted, the carbon forming property is good, the flame retardant efficiency is high, the mixed yarn fabric structure of the glass fiber and the matrix resin fiber is adopted, the impregnation is sufficient, and the size stability and the mechanical property are excellent. In this embodiment, the acid source is ammonium polyphosphate with a polymerization degree of 1000, the carbon source is caged phosphate, and the gas source is melamine. The antioxidant is antioxidant 246, and the processing aid can be one or more of plasticizer, nucleating agent, lubricant, mold release agent, light stabilizer, pigment or dye.
The mixed fiber yarn fabric is plain cloth formed by alternately weaving glass fiber and polypropylene fiber according to a ratio of 40:60, the mixed fiber yarn fabric is of a wrapped yarn structure, the core yarn is the glass fiber, and the wrapping layer is the polypropylene fiber.
The forming process adopts the laminating and hot-pressing compounding of the fabric structure enhancement layer and the polypropylene flame-retardant sheet layer, avoids the direct contact of the flame retardant with the glass fiber, and specifically adopts the following steps:
(1) preparing the polypropylene halogen-free flame-retardant sheet according to the components and the weight parts, then uniformly mixing in a high-speed mixer, carrying out double-screw melting, mixing, extruding, cooling, drying and granulating to obtain polypropylene halogen-free flame-retardant granules, and finally carrying out hot pressing on the polypropylene halogen-free flame-retardant granules to obtain the polypropylene halogen-free flame-retardant sheet with the thickness of 0.4 mm;
(2) and (2) placing the polypropylene halogen-free flame-retardant sheet and the mixed fiber yarn fabric into a die cavity for lamination, hot-pressing and composite molding, wherein the preheating pressure is 0.5MPa, the preheating temperature is 190 ℃, the preheating time is 60s, the holding pressure is 3MPa, the holding temperature is 190 ℃, the holding time is 180s, the cold-pressing pressure is 3MPa, the cold-pressing temperature is 10 ℃, the cold-pressing time is 300s, and the thickness of the die cavity is 0.2mm larger than that of the halogen-free flame-retardant mixed fiber yarn fabric laminated plate, so that the halogen-free flame-retardant.
Example 5
The halogen-free flame-retardant hybrid fiber yarn fabric laminated board is obtained by alternately laminating hybrid fiber yarn fabrics and polypropylene halogen-free flame-retardant sheets, wherein the outermost layer of the laminated board is the polypropylene halogen-free flame-retardant sheet, and the ratio of the hybrid fiber yarn fabrics to the polypropylene halogen-free flame-retardant sheets is 2: 1 are in alternating stacks.
The polypropylene halogen-free flame-retardant sheet is prepared from the following raw materials in parts by weight:
70 parts of polypropylene resin, 25 parts of halogen-free flame retardant system, 0.4 part of antioxidant, 0.5 part of compatilizer and 0.8 part of processing aid.
The halogen-free flame retardant system is a P-N halogen-free flame retardant system and is obtained by mixing an acid source, a carbon source and a gas source according to the ratio of 60:10: 30. The intumescent P-N halogen-free flame retardant system is adopted, the carbon forming property is good, the flame retardant efficiency is high, the mixed yarn fabric structure of the glass fiber and the matrix resin fiber is adopted, the impregnation is sufficient, and the size stability and the mechanical property are excellent. Wherein the acid source is ammonium polyphosphate with polymerization degree of 2000, the carbon source is a mixture of cage-shaped phosphate and cage-shaped phosphate oligomer, and the gas source is a mixture of melamine and melamine polyphosphate. The antioxidant is a mixture of the antioxidant 264 and the antioxidant 1010, the compatilizer is a mixture of acrylate and methacrylate, and the processing aid is one or more selected from a plasticizer, a nucleating agent, a lubricant, a release agent, a light stabilizer, a pigment or a dye.
The mixed fiber yarn fabric is twill cloth formed by alternately weaving glass fiber and polypropylene fiber according to a ratio of 50:50, the mixed fiber yarn fabric is of a wrapped yarn structure, core yarn is glass fiber, a coating layer is polypropylene fiber, and two layers of mixed fiber yarn fabrics are laid according to the fiber orientation in a staggered mode by 30 degrees.
The forming process adopts the laminating and hot-pressing compounding of the fabric structure enhancement layer and the polypropylene flame-retardant sheet layer, avoids the direct contact of the flame retardant with the glass fiber, and specifically adopts the following steps:
(1) preparing the polypropylene halogen-free flame-retardant sheet according to the components and the weight parts, then uniformly mixing in a high-speed mixer, carrying out double-screw melting, mixing, extruding, cooling, drying and granulating to obtain polypropylene halogen-free flame-retardant granules, and finally carrying out hot pressing on the polypropylene halogen-free flame-retardant granules to obtain the polypropylene halogen-free flame-retardant sheet with the thickness of 0.6 mm;
(2) and (2) placing the polypropylene halogen-free flame-retardant sheet and the mixed fiber yarn fabric into a mold cavity for lamination, hot-pressing and composite molding, wherein the preheating pressure is 2MPa, the preheating temperature is 230 ℃, the preheating time is 20s, the holding pressure is 16MPa, the holding temperature is 230 ℃, the holding time is 40s, the cold-pressing pressure is 16MPa, the cold-pressing temperature is 40 ℃, the cold-pressing time is 180s, and the thickness of the mold cavity is 0.4mm larger than that of the halogen-free flame-retardant mixed fiber yarn fabric laminated plate, so that the halogen-free flame-retardant.
Example 6
The halogen-free flame-retardant hybrid fiber yarn fabric laminated board is obtained by alternately laminating hybrid fiber yarn fabrics and polypropylene halogen-free flame-retardant sheets, wherein the outermost layer of the laminated board is the polypropylene halogen-free flame-retardant sheet, and the ratio of the hybrid fiber yarn fabrics to the polypropylene halogen-free flame-retardant sheets is 2: 1 are in alternating stacks.
The polypropylene halogen-free flame-retardant sheet is prepared from the following raw materials in parts by weight: 80 parts of polypropylene resin, 20 parts of halogen-free flame retardant system, 0.6 part of antioxidant, 1 part of compatilizer and 1 part of processing aid.
The halogen-free flame retardant system is a P-N halogen-free flame retardant system and is obtained by mixing an acid source, a carbon source and a gas source according to the ratio of 70:5: 25. The intumescent P-N halogen-free flame retardant system is adopted, the carbon forming property is good, the flame retardant efficiency is high, the mixed yarn fabric structure of the glass fiber and the matrix resin fiber is adopted, the impregnation is sufficient, and the size stability and the mechanical property are excellent. The acid source used is ammonium polyphosphate with polymerization degree of 2800, the carbon source is polyhydroxy compound, and the gas source is melamine cyanurate. The antioxidant is antioxidant 168, the compatilizer is maleic anhydride, and the processing aid is one or more selected from plasticizer, nucleating agent, lubricant, mold release agent, light stabilizer, pigment or dye.
The mixed fiber yarn fabric is plain cloth or twill cloth which is formed by alternately weaving glass fiber and polypropylene fiber according to the ratio of 60:40, the mixed fiber yarn fabric is of a wrapped yarn structure, the core yarn is glass fiber, and the wrapping layer is polypropylene fiber. The two layers of the mixed fiber yarn fabrics are laid according to the fiber orientation by staggering 45 degrees.
The forming process adopts the laminating and hot-pressing compounding of the fabric structure enhancement layer and the polypropylene flame-retardant sheet layer, avoids the direct contact of the flame retardant with the glass fiber, and specifically adopts the following steps:
(1) preparing the polypropylene halogen-free flame-retardant sheet according to the components and the weight parts, then uniformly mixing in a high-speed mixer, carrying out double-screw melting, mixing, extruding, cooling, drying and granulating to obtain polypropylene halogen-free flame-retardant granules, and finally carrying out hot pressing on the polypropylene halogen-free flame-retardant granules to obtain the polypropylene halogen-free flame-retardant sheet with the thickness of 0.8 mm;
(2) the method comprises the steps of hot-pressing the hybrid fiber yarn fabric into a hard sheet, placing the hard sheet and the polypropylene halogen-free flame-retardant sheet into a mold cavity for lamination, hot-pressing and composite molding, wherein the preheating pressure is 1MPa, the preheating temperature is 200 ℃, the preheating time is 40s, the pressure maintaining pressure is 10MPa, the pressure maintaining temperature is 20 ℃, the pressure maintaining time is 120s, the cold-pressing pressure is 10MPa, the cold-pressing temperature is 30 ℃, the cold-pressing time is 240s, and the thickness of the mold cavity is 0.6mm larger than that of the halogen-free flame-retardant hybrid fiber yarn fabric laminated plate.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (4)
1. A halogen-free flame-retardant hybrid fiber yarn fabric laminated board is characterized in that the laminated board is obtained by alternately laminating hybrid fiber yarn fabric and polypropylene halogen-free flame-retardant sheets,
the outermost layer of the laminated plate is a polypropylene halogen-free flame-retardant sheet, and the mixed fiber yarn fabric and the polypropylene halogen-free flame-retardant sheet are mixed according to the weight ratio of 1: 1 or 2: 1, alternately laminating;
the halogen-free flame-retardant mixed fiber yarn fabric laminated plate is prepared by the following method:
(1) the polypropylene halogen-free flame-retardant sheet material is prepared from the following components in parts by weight:
uniformly mixing the components in a high-speed mixer, carrying out twin-screw melting, mixing, extruding, cooling, drying and granulating to obtain polypropylene halogen-free flame-retardant granules, and finally carrying out hot pressing on the polypropylene halogen-free flame-retardant granules to obtain a polypropylene halogen-free flame-retardant sheet with the thickness of 0.4-0.8 mm;
(2) placing the polypropylene halogen-free flame-retardant sheet and the mixed fiber yarn fabric into a mold cavity for lamination, hot-pressing and composite molding, or firstly hot-pressing the mixed fiber yarn fabric into a hard sheet, then placing the hard sheet and the polypropylene halogen-free flame-retardant sheet into the mold cavity for lamination, hot-pressing and composite molding, wherein the thickness of the mold cavity is 0.2-0.6 mm larger than that of the halogen-free flame-retardant mixed fiber yarn fabric laminated plate, and obtaining the halogen-free flame-retardant mixed fiber yarn fabric laminated plate;
the halogen-free flame retardant system is a P-N halogen-free flame retardant system and is obtained by mixing an acid source, a carbon source and a gas source according to the ratio of 50-70:5-20:10-45,
the acid source is ammonium polyphosphate with polymerization degree of 1000-2000,
the carbon source is one or more of caged phosphate, caged phosphate oligomer, pentaerythritol oligomer or polyhydroxy compound,
the gas source is one or more of melamine, melamine polyphosphate and melamine cyanurate;
the antioxidant is one or more of hindered phenol antioxidant, phosphite antioxidant or organic sulfur antioxidant,
the compatilizer is selected from one or more of acrylic acid, acrylic ester, methacrylate, acrylonitrile or maleic anhydride,
the processing aid is selected from one or more of a plasticizer, a nucleating agent, a lubricant, a release agent, a light stabilizer, a pigment or a dye;
the antioxidant comprises antioxidant 246, antioxidant 264, antioxidant 1010, antioxidant 1076 or antioxidant 168;
the mixed fiber yarn fabric is plain cloth or twill cloth which is formed by alternately weaving glass fiber and polypropylene fiber according to the ratio of 40-60: 60-40;
the mixed fiber yarn fabric is of a wrapped yarn structure, the core yarn is glass fiber, and the coating layer is polypropylene fiber.
2. The halogen-free flame-retardant hybrid fiber yarn fabric laminated plate according to claim 1, wherein the polypropylene halogen-free flame-retardant sheet is prepared from the following raw materials in parts by weight:
50-80 parts of polypropylene resin, 20-40 parts of halogen-free flame retardant system, 0.2-0.6 part of antioxidant, 0-1 part of compatilizer and 0.5-1 part of processing aid.
3. The halogen-free flame-retardant hybrid fiber yarn fabric laminated board according to claim 1, wherein the hybrid fiber yarn fabrics are laid in parallel with each other or at a certain angle in accordance with fiber orientation.
4. The halogen-free flame-retardant hybrid fiber yarn fabric laminate of claim 1, wherein the preheating pressure is 0.5MPa to 2MPa, the preheating temperature is 190 ℃ to 230 ℃, the preheating time is 20s to 60s, the holding pressure is 3MPa to 16MPa, the holding temperature is 190 ℃ to 230 ℃, the holding time is 40s to 180s, the cold pressing pressure is 3MPa to 16MPa, the cold pressing temperature is 10 ℃ to 40 ℃, and the cold pressing time is 180s to 300s when the hot-press composite molding is performed in the step (2).
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| CN1807497A (en) * | 2006-02-08 | 2006-07-26 | 华东理工大学 | Swell type combustion-proof glass fiber reinforced polypropylene composite material and its preparation method |
| CN101936449A (en) * | 2009-06-30 | 2011-01-05 | 江苏纤强复合材料有限公司 | High-strength combination reinforced thermoplastic composite material board |
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