A method for manufacturing a variable reinforcement hot melt prepreg and a manufacturing device thereof

Abstract

The present application relates to the technical field of composite materials, and in particular to a preparation method and device of a variable-reinforcement hot-melt prepreg; the method comprises the following steps: preparing an adhesive film, preparing a lapped fiber cloth, stacking the adhesive film and the lapped fiber cloth, obtaining a prepared variable-reinforcement hot-melt prepreg, hot-pressing and compounding by using a hot-pressing roller to obtain the variable-reinforcement hot-melt prepreg, and after cooling, compounding and rolling with a PE film for standby use; the present application also provides a preparation device of the preparation method of the variable-reinforcement hot-melt prepreg, which comprises a conveying roller, an adhesive groove, a hot-melt prepreg machine, a cooling system, a rolling roller, a rolling system and the like; the preparation method of the variable-reinforcement hot-melt prepreg provided by the present application can directly prepare the variable-reinforcement hot-melt prepreg, there are different reinforcement materials on one prepreg cloth, the prepreg cloth with variable reinforcement is cut in one step, the overlap width of the reinforcement is accurately controlled, and the working efficiency is effectively improved and waste is avoided.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, and in particular to a method and apparatus for preparing a variable-reinforced hot-melt prepreg. Background Technology

[0002] Conventional aircraft mostly use circular cross-section modules, while hypersonic aircraft widely use non-circular cross-section modules, i.e., irregularly shaped modules. The heat protection requirements of different parts of the irregularly shaped module are different, which requires that the reinforcing materials or resin matrices of different parts be different. The commonly used method is to prepare two prepregs with different reinforcing materials. The parts of the irregularly shaped module with high heat protection requirements use ablation-resistant high silica cloth or the like as reinforcement, while the leeward side with lower heat protection requirements mainly uses low-density organic fiber cloth or the like as reinforcement. It is necessary to first prepare two prepregs, cut them into the required sizes, and then manually overlap and lay them. However, this method is not easy to control the overlap margin precisely, resulting in large errors, and multiple cuts cause waste. Currently, there are only reports on hot melt prepregs with single reinforcement, and few reports on hot melt prepregs with variable reinforcement.

[0003] Therefore, in order to address the above problems, the present invention urgently needs to provide a method and apparatus for preparing a variable-reinforced hot-melt prepreg. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for preparing variable-reinforced hot-melt prepreg. The method for preparing variable-reinforced hot-melt prepreg provided by this invention can directly prepare variable-reinforced hot-melt prepreg. A prepreg fabric has different reinforcing materials. According to the product shape and technical requirements, the prepreg fabric with variable reinforcement can be cut out in one step. This invention can accurately control the overlap width of the reinforcement, effectively improve work efficiency and avoid waste.

[0005] The present invention provides a method for preparing a variable-reinforced hot-melt prepreg, comprising the following steps:

[0006] S1. Preparation of adhesive film;

[0007] S2. At least two reinforcing fiber cloths are laterally overlapped with each other, and the materials of the two adjacent reinforcing fiber cloths are different. The overlapping fiber cloth is obtained according to the set overlap width of the overlapping reinforcing fiber cloths.

[0008] S3. Stack the adhesive film and the overlapping fiber cloth to obtain the pre-made variable reinforcement hot melt prepreg;

[0009] S4. The hot press rollers in the composite production equipment of the hot melt prepreg machine are heated, and the pre-made variable reinforcement hot melt prepreg is conveyed between the upper and lower corresponding hot press rollers for hot pressing composite to obtain the variable reinforcement hot melt prepreg.

[0010] The stacking order of the adhesive film and the overlapping fiber cloth is as follows: one layer of adhesive film is placed on the top and bottom, and the overlapping fiber cloth is placed in the middle; or one layer of adhesive film is placed on the bottom and the overlapping fiber cloth is placed on the top.

[0011] Preferably, the variable reinforcement hot melt prepreg is cooled, and a PE film is provided on the top of the cooled variable reinforcement hot melt prepreg, which is then rolled and wound up for later use.

[0012] Preferably, in step S1, the step of preparing the adhesive film includes:

[0013] The hot-melt phenolic resin is heated until it melts. The heating temperature of the hot-melt phenolic resin is 70-90℃, and the heating time is 1-3 hours.

[0014] Molten hot-melt phenolic resin is poured into the coating production equipment of the hot-melt prepreg machine for coating to form a uniform film. The coating temperature is 70-90℃. The gap of the coating rollers and the coating speed are adjusted to 3-10 m / min.

[0015] Preferably, in step S4, the adhesive film and the overlapping fiber cloth are hot-pressed together, the temperature of the hot press roller is controlled at 70-120°C, and the linear speed of the hot press roller is controlled at 3-10 m / min.

[0016] Preferably, the overlap width is 2-4 cm.

[0017] Preferably, the reinforcing fiber cloth is: quartz fiber cloth, aramid fiber cloth, glass fiber cloth, high silica fiber cloth, a blended cloth woven from aramid fiber and quartz fiber, a blended cloth woven from aramid fiber and glass fiber, a blended cloth woven from aramid sulfone fiber and quartz fiber, or a blended cloth woven from aramid sulfone fiber and glass fiber.

[0018] Preferably, the width of the reinforcing fiber cloth is less than 60cm.

[0019] Preferably, the width of the variable-reinforced hot-melt prepreg is 100cm-120cm.

[0020] The present invention also provides a preparation apparatus for a method of preparing a variable reinforcement hot melt prepreg, comprising conveying rollers for conveying fiber cloth, a hot melt prepreg machine, a cooling system, a rolling roller and a winding system arranged in sequence, wherein the hot melt prepreg machine is connected to a glue tank.

[0021] The hot melt prepreg machine includes a coating production equipment and a composite production equipment connected in sequence; the coating production equipment is equipped with upper and lower corresponding coating rollers, and the composite production equipment is equipped with upper and lower corresponding hot press rollers.

[0022] Preferably, the composite production equipment is equipped with at least four sets of corresponding upper and lower hot press rollers.

[0023] The method and apparatus for preparing a variable-reinforced hot-melt prepreg provided by this invention have the following advantages compared with the prior art:

[0024] 1. This invention provides a method for preparing variable-reinforced hot-melt prepreg, which can directly prepare variable-reinforced hot-melt prepreg. A prepreg fabric with different reinforcing materials is cut into a single step according to the product shape and technical requirements. The method can accurately control the overlap width of the reinforcing materials, effectively improve work efficiency and avoid waste. The method is simple and can improve production efficiency. According to the product shape and technical requirements.

[0025] 2. The present invention provides a preparation apparatus for a method of preparing a variable reinforcement hot melt prepreg, which is suitable for continuous production of variable reinforcement hot melt prepreg. It can overlap the fiber cloth laterally, and can continuously and stably realize the stacking of the adhesive film and the overlapping fiber cloth, and hot press it into a variable reinforcement hot melt prepreg. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is an overlapping schematic diagram of the aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg described in this invention;

[0028] Figure 2 This is a schematic diagram of the process for the aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg described in this invention.

[0029] Figure 3 This is an overlay diagram of the aramid fiber cloth / quartz fiber cloth / aramid fiber cloth variable reinforcement hot melt prepreg described in this invention.

[0030] Figure 4 This is a schematic diagram of the process of the aramid fiber cloth / quartz fiber cloth / aramid fiber cloth variable reinforcement hot melt prepreg described in this invention.

[0031] Figure 5 This is an overlay diagram of the variable reinforcement hot melt prepreg of the high silica fiber cloth / aramid fiber cloth / aramid fiber and glass fiber woven blend cloth / glass fiber cloth described in this invention.

[0032] Figure 6This is a schematic diagram of the process of the blended fabric of high silica fiber cloth / aramid fiber cloth / aramid fiber and glass fiber woven blended fabric / glass fiber cloth with variable reinforcement hot melt prepreg as described in this invention.

[0033] Figure 7 This is an overlay diagram of the variable reinforcement hot melt prepreg of the blended fabric woven from aramid fiber and quartz fiber, the blended fabric woven from aramid fiber and glass fiber, and the blended fabric woven from aramid fiber and quartz fiber described in this invention.

[0034] Figure 8 This is a schematic diagram of the process for the variable reinforcement hot-melt prepreg of the blended fabric woven from aramid fiber and quartz fiber, the blended fabric woven from aramid fiber and glass fiber, and the blended fabric woven from aramid fiber and quartz fiber described in this invention.

[0035] The attached figures are labeled as follows:

[0036] 1. Reinforcing fiber cloth; 2. Overlapping zone; 3. Reinforcing fiber cloth roller; 4. Aramid fiber cloth; 5. Glass fiber cloth; 6. Upper glue tank; 601. Lower glue tank; 7. Hot press roller; 8. Cooling system; 9. Roller roller; 10. PE film roller; 11. Winding system; 12. Conveyor roller; 13. Coating roller; 14. Quartz fiber cloth; 15. Blended fabric woven from aramid fiber and glass fiber; 16. High silica fiber cloth; 17. Blended fabric woven from aramid fiber and quartz fiber; 18. Blended fabric woven from aramid sulfone fiber and glass fiber; 19. Blended fabric woven from aramid sulfone fiber and quartz fiber. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Example 1

[0041] like Figure 1 , Figure 2 As shown, the present invention provides a method and apparatus for preparing a variable-reinforced hot-melt prepreg, comprising the following steps:

[0042] S1. Preparation of adhesive film,

[0043] The steps for preparing the adhesive film include:

[0044] The hot-melt phenolic resin is heated until it melts. The heating temperature of the hot-melt phenolic resin is 70℃ and the heating time is 3 hours.

[0045] Molten hot-melt phenolic resin is poured into the coating production equipment of the hot-melt prepreg machine for coating to form a uniform film. The coating temperature is 70℃. The gap and coating speed of the coating roller 13 are adjusted to a coating speed of 3 m / min.

[0046] S2. Different reinforcing fiber fabrics are horizontally overlapped with each other. At least two types of reinforcing fiber fabrics are horizontally overlapped and overlapped. According to the set overlap width of the overlapping reinforcing fiber fabrics, an overlap area 2 is formed with an overlap width of 4cm to obtain the overlapped fiber fabric.

[0047] S3. Stack the adhesive film and the overlapping fiber cloth to obtain the pre-made variable reinforcement hot melt prepreg;

[0048] S4. Heat the hot press roller 7 in the composite production equipment of the hot melt prepreg machine to hot press the adhesive film and the overlapping fiber cloth. The temperature of the hot press roller is controlled at 70℃, and the linear speed of the hot press roller 7 is controlled at 3 m / min. The stacking order of the adhesive film and the overlapping fiber cloth is to place one layer of adhesive film on the top and bottom and the overlapping fiber cloth in the middle, or to place one layer of adhesive film on the bottom and the overlapping fiber cloth on the top. The pre-made variable reinforcement hot melt prepreg is conveyed between the corresponding hot press rollers 7 on the top and bottom for hot pressing composite to obtain the variable reinforcement hot melt prepreg.

[0049] like Figure 1As shown, the reinforcing fiber cloth 1 is wound on the reinforcing fiber cloth roller 3. The width of the reinforcing fiber cloth 1 is less than 60cm. In this embodiment, the reinforcing fiber cloth 1 includes: aramid fiber cloth 4 with a width of 52cm and glass fiber cloth 5 with a width of 52cm. The aramid fiber cloth / glass fiber cloth overlap is obtained by transverse overlap. The overlap area 2 of the aramid fiber cloth / glass fiber cloth overlap has an overlap width of 4cm. After applying glue and hot pressing to the top and bottom of the aramid fiber cloth / glass fiber cloth overlap, a variable reinforcing hot melt prepreg of aramid fiber cloth / glass fiber cloth is obtained. The total width of the variable reinforcing hot melt prepreg of aramid fiber cloth / glass fiber cloth is 100cm.

[0050] The aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg is cooled, and a PE film is placed on the top of the cooled aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg. Then it is rolled by the rolling roller 9 and wound up for later use.

[0051] The present invention provides a method for directly preparing variable-reinforced hot-melt prepreg. A prepreg fabric has different reinforcing materials, including aramid fiber cloth and glass fiber cloth, which are horizontally overlapped according to the product shape and technical requirements. This method can achieve one-step cutting of the variable-reinforced prepreg fabric. By precisely controlling the overlap width of the reinforcing materials, the work efficiency is effectively improved and waste is avoided. The method is simple and can improve production efficiency.

[0052] like Figure 2 As shown, the present invention also provides a preparation apparatus for a method of preparing a variable-reinforcement hot-melt prepreg. A conveying roller 12 sequentially transports fiber cloth. Two reinforcing fiber cloth rollers 3 are connected to the front end of the conveying roller 12, respectively wound with aramid fiber cloth 4 and glass fiber cloth 5. The rear end of the conveying roller 12 transports the overlapping fiber cloth of aramid fiber cloth 4 and glass fiber cloth 5 to a coating roller 13 in the coating production equipment of the hot-melt prepreg machine, and then to a hot-pressing roller 7 in the composite production equipment of the hot-melt prepreg machine. The hot-melt prepreg machine includes: a coating roller 13. The coating production equipment and the composite production equipment equipped with hot press rollers 7 are then fed into the cooling system 8. The PE film is laid on the aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg by the PE film roller 10, and then rolled by the rolling roller 9 before entering the winding system 11 for winding and waiting for use. The hot melt prepreg machine is connected to the upper glue tank 6 and the lower glue tank 601. The coating production equipment is equipped with upper and lower corresponding coating rollers 13, and the composite production equipment is equipped with upper and lower corresponding hot press rollers 7. Among them, the composite production equipment is equipped with 4 sets of upper and lower corresponding hot press rollers 7.

[0053] This embodiment yields a variable-reinforcement hot-melt prepreg of aramid fiber cloth / glass fiber cloth, and also provides a preparation apparatus for the variable-reinforcement hot-melt prepreg of aramid fiber cloth / glass fiber cloth, which is suitable for continuous production of variable-reinforcement hot-melt prepreg. It can overlap the fiber cloth laterally, and can continuously and stably realize the stacking of adhesive film and overlapping fiber cloth, and hot-press it into variable-reinforcement hot-melt prepreg.

[0054] Example 2

[0055] like Figure 3 , Figure 4 As shown, the present invention provides a method for preparing a variable-reinforced hot-melt prepreg, comprising the following steps:

[0056] S1. Preparation of adhesive film,

[0057] The steps for preparing the adhesive film include:

[0058] The hot-melt phenolic resin is heated until it melts. The heating temperature of the hot-melt phenolic resin is 90℃ and the heating time is 1 hour.

[0059] Molten hot-melt phenolic resin is poured into the coating production equipment of the hot-melt prepreg machine for coating to form a uniform film. The coating temperature is 90℃. The gap of the coating rollers and the coating speed are adjusted to 10 m / min.

[0060] S2. Different reinforcing fiber fabrics are overlapped laterally. At least two types of reinforcing fiber fabrics are overlapped laterally. The overlap width of the overlapping reinforcing fiber fabrics is set to 2cm to obtain the overlapped fiber fabric.

[0061] S3. Stack the adhesive film and the overlapping fiber cloth to obtain the pre-made variable reinforcement hot melt prepreg;

[0062] S4. Heat the hot press rollers in the composite production equipment of the hot melt prepreg machine to hot press the adhesive film and the overlapping fiber cloth. The temperature of the hot press roller is controlled at 120℃ and the linear speed of the hot press roller is controlled at 10 m / min. The stacking order of the adhesive film and the overlapping fiber cloth is to place one layer of adhesive film on the top and bottom and the overlapping fiber cloth in the middle, or to place one layer of adhesive film on the bottom and the overlapping fiber cloth on the top. The pre-made variable reinforcement hot melt prepreg is conveyed between the corresponding hot press rollers on the top and bottom for hot pressing composite to obtain the variable reinforcement hot melt prepreg.

[0063] like Figure 3 As shown, the reinforcing fiber cloth 1 is wound on the reinforcing fiber cloth roller 3. The width of the reinforcing fiber cloth 1 is less than 60cm. In this embodiment, as shown... Figure 3The reinforcing fiber cloth 1 shown includes, in sequence: aramid fiber cloth 4 with a width of 31cm, quartz fiber cloth 14 with a width of 32cm, and aramid fiber cloth 4 with a width of 41cm, thus obtaining an aramid fiber cloth / quartz fiber cloth / aramid fiber cloth overlap cloth, an overlap area 2 of the aramid fiber cloth / quartz fiber cloth / aramid fiber cloth overlap cloth, and an overlap width of 2cm. After applying glue and hot pressing to the top and bottom of the aramid fiber cloth / quartz fiber cloth / aramid fiber cloth overlap cloth, the total width of the obtained aramid fiber cloth / quartz fiber cloth / aramid fiber cloth variable reinforcement hot melt prepreg is 100cm.

[0064] The modified reinforcing hot melt prepreg of aramid fiber cloth / quartz fiber cloth / aramid fiber cloth is cooled. The cooled aramid fiber cloth / quartz fiber cloth / aramid fiber cloth has a PE film on the top. Then it is rolled and wound up for later use.

[0065] The present invention provides a method for directly preparing variable-reinforcement hot-melt prepreg. A prepreg fabric has different reinforcement materials, including aramid fiber fabric and quartz fiber fabric. The overlapping method is a transverse overlap of aramid fiber fabric / quartz fiber fabric / aramid fiber fabric, which is set according to the product shape and technical requirements. It can realize the one-step cutting of the variable-reinforcement prepreg fabric. By precisely controlling the overlap width of the reinforcement, the work efficiency is effectively improved and waste is avoided. The method is simple and can improve production efficiency.

[0066] like Figure 4 As shown, the present invention also provides a preparation apparatus for a method of preparing a variable reinforcement hot melt prepreg, comprising conveying rollers 12 arranged in sequence for conveying fiber cloth, with three reinforcement fiber cloth rollers 3 connected to the front end of the conveying rollers 12, respectively wound with aramid fiber cloth 4, quartz fiber cloth 14, and aramid fiber cloth 4. The rear ends of two conveying rollers 12 convey the overlapping fiber cloth of aramid fiber cloth / quartz fiber cloth / aramid fiber cloth to the coating roller 13 in the coating production equipment of the hot melt prepreg machine, and then to the hot press roller 7 in the composite production equipment of the hot melt prepreg machine. The equipment includes: a coating production device with coating rollers 13 and a composite production device with hot press rollers 7. The film is then fed into a cooling system 8. A PE film is laid on top of the aramid fiber cloth / glass fiber cloth variable reinforcement hot melt prepreg by PE film rollers 10. After being rolled by pressing rollers 9, it enters a winding system 11 for winding and waiting for use. The hot melt prepreg machine is connected to the upper glue tank 6 and the lower glue tank 601. The coating production device has upper and lower corresponding coating rollers 13, and the composite production device has upper and lower corresponding hot press rollers 7. The composite production device has 4 sets of upper and lower corresponding hot press rollers 7.

[0067] This embodiment yields a variable-reinforcement hot-melt prepreg of aramid fiber cloth / quartz fiber cloth / aramid fiber cloth. It also provides a preparation apparatus for this variable-reinforcement hot-melt prepreg, suitable for continuous production. This apparatus allows for transverse overlap of the fiber cloth, enabling continuous and stable stacking of the adhesive film and overlapping fiber cloths, followed by hot pressing to produce the variable-reinforcement hot-melt prepreg.

[0068] Example 3

[0069] like Figure 5 , Figure 6 As shown, the present invention provides a method and apparatus for preparing a variable-reinforced hot-melt prepreg, comprising the following steps:

[0070] S1. Preparation of adhesive film,

[0071] The steps for preparing the adhesive film include:

[0072] The hot-melt phenolic resin is heated until it melts. The heating temperature of the hot-melt phenolic resin is 80℃ and the heating time is 2 hours.

[0073] Molten hot-melt phenolic resin is poured into the coating production equipment of the hot-melt prepreg machine for coating to form a uniform film. The coating temperature is 80℃. The gap of the coating rollers and the coating speed are adjusted to 6 m / min.

[0074] S2. Different reinforcing fiber fabrics are overlapped laterally. Four types of reinforcing fiber fabrics are overlapped laterally. The overlap width of the overlapping reinforcing fiber fabrics is set to 2cm to obtain the overlapped fiber fabric.

[0075] S3. Stack the adhesive film and the overlapping fiber cloth to obtain the pre-made variable reinforcement hot melt prepreg;

[0076] S4. Heat the hot press rollers in the composite production equipment of the hot melt prepreg machine to hot press the adhesive film and the overlapping fiber cloth. The temperature of the hot press roller is controlled at 100℃ and the linear speed of the hot press roller is controlled at 6m / min. The stacking order of the adhesive film and the overlapping fiber cloth is to place one layer of adhesive film on the top and bottom and the overlapping fiber cloth in the middle, or to place one layer of adhesive film on the bottom and the overlapping fiber cloth on the top. The pre-made variable reinforcement hot melt prepreg is conveyed between the corresponding hot press rollers on the top and bottom for hot pressing composite to obtain the variable reinforcement hot melt prepreg.

[0077] like Figure 5 As shown, the reinforcing fiber cloth 1 is wound on the reinforcing fiber cloth roller 3. The width of the reinforcing fiber cloth 1 is less than 60cm. In this embodiment, as shown... Figure 5The reinforcing fiber cloth 1 shown includes, in sequence: a high-silica fiber cloth 16 with a width of 21cm, an aramid fiber cloth 4 with a width of 32cm, a woven blend of aramid and glass fiber cloth 15 with a width of 42cm, and a glass fiber cloth 5 with a width of 31cm. After being overlapped laterally, they form an overlap cloth of high-silica fiber cloth / aramid fiber cloth / woven blend of aramid and glass fiber cloth / glass fiber cloth. The overlap cloth of high-silica fiber cloth / aramid fiber cloth / woven blend of aramid and glass fiber cloth / glass fiber cloth has 3 overlapping areas 2, and the overlap width of each overlapping area 2 is 2cm. After applying glue and hot pressing to the top and bottom of the overlap cloth of high-silica fiber cloth / aramid fiber cloth / woven blend of aramid and glass fiber cloth / glass fiber cloth, a variable reinforcing hot melt prepreg of high-silica fiber cloth / aramid fiber cloth / woven blend of aramid and glass fiber cloth / glass fiber cloth is obtained, with a total width of 120cm.

[0078] The variable reinforcement hot melt prepreg of high silica fiber cloth / aramid fiber cloth / aramid fiber and glass fiber woven blend cloth / glass fiber cloth is cooled. After cooling, a PE film is placed on the top of the variable reinforcement hot melt prepreg of high silica fiber cloth / aramid fiber cloth / aramid fiber and glass fiber woven blend cloth / glass fiber cloth. Then it is rolled and wound up for later use.

[0079] The present invention provides a method for directly preparing variable-reinforcement hot-melt prepreg. A prepreg fabric contains different reinforcing materials, including aramid fiber cloth, high-silica fiber cloth, glass fiber cloth, and a blended fabric woven from aramid and glass fibers. The overlapping method involves the aramid fiber cloth, high-silica fiber cloth, glass fiber cloth, and the blended fabric woven from aramid and glass fibers overlapping laterally, set according to the product shape and technical requirements. This method enables one-step cutting of the variable-reinforcement prepreg fabric. By precisely controlling the overlap width of the reinforcement, work efficiency is effectively improved and waste is avoided. This method is simple and can significantly improve production efficiency.

[0080] like Figure 6As shown, the present invention also provides a preparation apparatus for a method of preparing a variable-reinforcement hot-melt prepreg, comprising conveying rollers 12 arranged for conveying fiber cloth, with four reinforcing fiber cloth rollers 3 connected to the front end of the conveying rollers 12, respectively wound with aramid fiber cloth 4, high-silica fiber cloth 16, glass fiber cloth 5, and a hybrid fabric 15 woven from aramid fiber and glass fiber. The rear ends of two conveying rollers 12 convey the overlapping fiber cloth of high-silica fiber cloth / aramid fiber cloth / hybrid fabric woven from aramid fiber and glass fiber / glass fiber cloth to the coating rollers 13 in the coating production equipment of the hot-melt prepreg machine, and then to the hot-pressing rollers 7 in the composite production equipment of the hot-melt prepreg machine. The hot melt prepreg machine includes: a coating production device with coating rollers 13 and a composite production device with hot press rollers 7. The material is then fed into a cooling system 8. A PE film is laid on top of a variable-reinforcement hot melt prepreg made of high-silica fiber cloth / aramid fiber cloth / a blended cloth / glass fiber cloth woven with aramid fiber and glass fiber by PE film rollers 10. After being rolled by pressing rollers 9, the material enters a winding system 11 for winding and is ready for use. The hot melt prepreg machine is connected to an upper glue tank 6 and a lower glue tank 601. The coating production device has upper and lower corresponding coating rollers 13, and the composite production device has upper and lower corresponding hot press rollers 7. The composite production device has 4 sets of upper and lower corresponding hot press rollers 7.

[0081] This embodiment yields a variable-reinforcement hot-melt prepreg of high-silica fiber cloth / aramid fiber cloth / a blended cloth woven from aramid fiber and glass fiber / glass fiber cloth. It also provides a preparation apparatus for this variable-reinforcement hot-melt prepreg, suitable for continuous production of the material. This apparatus allows for transverse overlap of the fiber cloth, enabling continuous and stable stacking of the adhesive film and overlapping fiber cloths, followed by hot pressing to produce the variable-reinforcement hot-melt prepreg.

[0082] Example 4

[0083] like Figure 7 , Figure 8 As shown, the present invention provides a method and apparatus for preparing a variable-reinforced hot-melt prepreg, comprising the following steps:

[0084] S1. Preparation of adhesive film,

[0085] The steps for preparing the adhesive film include:

[0086] The hot-melt phenolic resin was heated until it melted. The heating temperature of the hot-melt phenolic resin was 78℃ and the heating time was 2 hours.

[0087] Molten hot-melt phenolic resin is poured into the coating production equipment of the hot-melt prepreg machine for coating to form a uniform film. The coating temperature is 78℃. The gap of the coating rollers and the coating speed are adjusted to 6 m / min.

[0088] S2. Different reinforcing fiber fabrics are horizontally overlapped with each other. Three types of reinforcing fiber fabrics are horizontally overlapped and overlapped. The overlap width of the overlapping reinforcing fiber fabrics is set to 2cm to obtain the overlapping fiber fabric.

[0089] S3. Stack the adhesive film and the overlapping fiber cloth to obtain the pre-made variable reinforcement hot melt prepreg;

[0090] S4. Heat the hot press rollers in the composite production equipment of the hot melt prepreg machine to hot press the adhesive film and the overlapping fiber cloth. The temperature of the hot press roller is controlled at 100℃ and the linear speed of the hot press roller is controlled at 6m / min. The stacking order of the adhesive film and the overlapping fiber cloth is to place one layer of adhesive film on the top and bottom and the overlapping fiber cloth in the middle, or to place one layer of adhesive film on the bottom and the overlapping fiber cloth on the top. The pre-made variable reinforcement hot melt prepreg is conveyed between the corresponding hot press rollers on the top and bottom for hot pressing composite to obtain the variable reinforcement hot melt prepreg.

[0091] like Figure 7 As shown, the reinforcing fiber cloth 1 is wound on the reinforcing fiber cloth roller 3. The width of the reinforcing fiber cloth 1 is less than 60cm. In this embodiment, as shown... Figure 5 The reinforcing fiber fabric 1 shown comprises, in sequence: a blended fabric 17 woven from aramid fibers and quartz fibers, with a width of 31 cm; a blended fabric 18 woven from aramid sulfone fibers and glass fibers, with a width of 32 cm; and a blended fabric 19 woven from aramid sulfone fibers and quartz fibers, with a width of 41 cm. These fabrics are laterally overlapped to form an overlap of blended fabrics woven from aramid fibers and quartz fibers, and blended fabrics woven from aramid sulfone fibers and glass fibers. The overlapping fabric of the blended aramid fiber and quartz fiber has two overlapping areas 2, each with an overlap width of 2cm. After gluing and hot pressing the upper and lower surfaces of the overlapping fabrics of the blended aramid fiber and quartz fiber, the variable reinforcement hot melt prepreg of the blended aramid fiber and quartz fiber, the total width of which is 100cm.

[0092] The variable reinforcement hot melt prepreg of the blended fabric woven with aramid fiber and quartz fiber, the blended fabric woven with aramid fiber and glass fiber, and the blended fabric woven with aramid fiber and quartz fiber is cooled. After cooling, the variable reinforcement hot melt prepreg of the blended fabric woven with aramid fiber and quartz fiber, the blended fabric woven with aramid fiber and glass fiber, and the blended fabric woven with aramid fiber and quartz fiber is covered with a PE film. Then it is rolled and wound up for later use.

[0093] The present invention provides a method for directly preparing variable-reinforcement hot-melt prepreg. A single prepreg fabric contains different reinforcing materials, including: a blended fabric woven from aramid fibers and quartz fibers, a blended fabric woven from aramid sulfone fibers and glass fibers, and a blended fabric woven from aramid sulfone fibers and quartz fibers. The overlapping method involves transverse overlap between the blended fabrics woven from aramid fibers and quartz fibers, the blended fabrics woven from aramid sulfone fibers and glass fibers, and the blended fabrics woven from aramid sulfone fibers and quartz fibers. This method is set according to the product shape and technical requirements, enabling one-step cutting of the variable-reinforcement prepreg. By precisely controlling the overlap width of the reinforcement, work efficiency is effectively improved and waste is avoided. This method is simple and can significantly improve production efficiency.

[0094] like Figure 8 As shown, the present invention also provides a preparation apparatus for a method of preparing a variable-reinforcement hot-melt prepreg. The apparatus includes conveying rollers 12 arranged for conveying fiber cloth. Three reinforcing fiber cloth rollers 3 are connected to the front ends of the conveying rollers 12, respectively winding with a blended fabric 17 woven from aramid fibers and quartz fibers, a blended fabric 18 woven from aramid fibers and glass fibers, and a blended fabric 19 woven from aramid fibers and quartz fibers. The rear ends of the two conveying rollers 12 convey the overlapping fiber cloths of the blended fabrics of aramid fibers and quartz fibers / aramid fibers and glass fibers / aramid fibers and quartz fibers to the coating rollers 13 in the coating production equipment of the hot-melt prepreg machine, and then to the composite production equipment of the hot-melt prepreg machine. The hot press roller 7, wherein the hot melt prepreg machine includes: a coating production equipment with a coating roller 13 and a composite production equipment with a hot press roller 7, and then inputs to the cooling system 8. PE film is laid on the variable reinforcement hot melt prepreg of the aramid fiber and quartz fiber blended fabric / aramid fiber and glass fiber blended fabric / aramid fiber and quartz fiber blended fabric by the PE film roller 10, and then rolled by the rolling roller 9 and enters the winding system 11 for winding and waiting for use. The hot melt prepreg machine is connected to the upper glue tank 6 and the lower glue tank 601; the coating production equipment is equipped with upper and lower corresponding coating rollers 13, and the composite production equipment is equipped with upper and lower corresponding hot press rollers 7, wherein the composite production equipment is equipped with 4 sets of upper and lower corresponding hot press rollers 7.

[0095] This embodiment yields a variable-reinforcement hot-melt prepreg made of a blended fabric woven from aramid fibers and quartz fibers, a blended fabric woven from aramid sulfone fibers and glass fibers, or a blended fabric woven from aramid sulfone fibers and quartz fibers. It also provides an apparatus for preparing this variable-reinforcement hot-melt prepreg, suitable for continuous production. This apparatus allows for transverse overlapping of the fiber fabrics, enabling continuous and stable stacking of the adhesive film and overlapping fiber fabrics, followed by hot pressing to form the variable-reinforcement hot-melt prepreg.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for the preparation of a variable reinforcement hot melt prepreg, characterized in that: It comprises the following steps: S1. Prepare the film, heat the hot melt phenolic resin, heat the hot melt phenolic resin, the heating temperature of the hot melt phenolic resin is 78℃, the heating time is 2h; Pour the hot melt phenolic resin into the film coating production equipment of hot melt pre-impregnation machine, coating, coating into uniform thickness of the film, the coating temperature is 78℃; Adjust the gap and coating speed of the coating roller, the coating speed is 6m / min; S2. The at least two reinforcing fiber cloth are overlapped transversely, the overlapping width of the overlapping part is 2-4cm; The width of the reinforcing fiber cloth is less than 60cm, the material of the two adjacent reinforcing fiber cloths is different, according to the set overlapping width of the overlapping reinforcing fiber cloth, the overlapping fiber cloth is obtained; The reinforcing fiber cloth includes: aramid fiber and quartz fiber woven mixed cloth, the width is 31cm, aramid fiber and glass fiber woven mixed cloth, the width is 32cm, aramid fiber and quartz fiber woven mixed cloth, the width is 41cm; The overlapping fiber cloth formed after transverse overlapping is the overlapping cloth of aramid fiber and quartz fiber woven mixed cloth / aramid fiber and glass fiber woven mixed cloth / aramid fiber and quartz fiber woven mixed cloth, the overlapping width of the overlapping area of the reinforcing fiber cloth is 2cm; S3. The film and the overlapping fiber cloth are stacked to obtain the prepared variable reinforcing hot melt pre-impregnated material, and the width of the variable reinforcing hot melt pre-impregnated material of the transversely overlapped overlapping fiber cloth is 100cm; S4. Heat the hot press roller in the composite production equipment of the hot melt pre-impregnation machine, convey the prepared variable reinforcing hot melt pre-impregnated material to the corresponding hot press roller between the upper and lower hot press rollers, and heat press composite to obtain the variable reinforcing hot melt pre-impregnated material. The film and the overlapping fiber cloth are heat pressed and compounded, the control temperature of the hot press roller is 100℃, and the linear speed of the hot press roller is controlled at 6m / min; Wherein, the stacking order of the film and the overlapping fiber cloth is one layer of film on the top and one layer of film on the bottom, and the overlapping fiber cloth is placed in the middle, or one layer of film is placed on the bottom and the overlapping fiber cloth is placed on the top; S5. Cool the variable reinforcing hot melt pre-impregnated material, and the upper part of the cooled variable reinforcing hot melt pre-impregnated material is provided with a PE film. Roll, roll for standby.

2. A device for the preparation of a variable reinforcement hot melt prepreg according to the method of claim 1, characterized in that: It comprises a conveying roller for conveying fiber cloth, a hot melt pre-impregnation machine, a cooling system, a rolling roller and a winding system arranged in sequence, and the hot melt pre-impregnation machine is connected with a glue tank; Wherein, the hot melt pre-impregnation machine comprises coating production equipment and composite production equipment connected in sequence; The coating production equipment is provided with upper and lower corresponding coating rollers, and the composite production equipment is provided with upper and lower corresponding hot press rollers; The composite production equipment is provided with at least 4 groups of upper and lower corresponding hot press rollers.

Images