JPS62130840A - Composite sheet for molding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a moldable composite sheet used as a heat insulating material, a heat retaining material, etc.

BACKGROUND OF THE INVENTION Examples of sheet materials made of inorganic fibers include glass fibers, steel fibers, rock wool, and slag wool.

These single fibers have a breaking elongation of 10% or less and are very small and brittle. Therefore, when molding is performed, it cannot withstand deformation and breaks. In addition, because it is particularly prone to skin disorders,
There are problems with the handling of insulation materials, heat insulating materials, etc. during construction.

As a countermeasure to this problem, composite sheets of nonwoven sheets and inorganic fibers are being used.

When molding is performed using a short fiber nonwoven sheet, non-uniform misalignment occurs between the constituent fibers, resulting in a ground split of 7"L. There are problems with insufficient dimensional stability and poor shape retention. .

On the other hand, since long-fiber nonwoven sheets made by the conventional spunbond method have long fibers, the degree of freedom of movement of the constituent fibers is small, and when needle-punching and intertwining the constituent fibers Disconnection occurs and confounding integration is poor. When this is subjected to forming force, the single fiber cutting elongation of the grooved fibers is 20~
60 inches, and since the elongation at break as a long fiber nonwoven sheet is as small as 25 to 35 inches, tearing occurs during deep uneven molding 401. In addition, since the interlacing and integration is poor, there are problems such as easy peeling between the inorganic fiber sheet and the long fiber nonwoven sheet.

Problems to be Solved by the Invention The overall purpose of the invention is to solve the above-mentioned problems of conventional non-separable sheets and to provide a moldable sheet.

Means for Solving the Problems The present invention laminates a long fiber nonwoven sheet made of semi-drawn yarn made of a thermoplastic polymer capable of forming fibers on at least one side of a sheet made of inorganic fibers. It is an integrated moldable composite sheet.

In the present invention, the long dL fiber sheet made of semi-drawn yarn made of a polyester polymer capable of forming fibers is a molten sheet made of polyester fibers, polyamide fibers, polyolefin fibers, copolymer fibers, etc. It is effective to use the so-called spunbonding method, in which a semi-drawn yarn obtained by spinning is taken up at high speed by means such as an air sucker and deposited on a moving collecting surface to obtain a uniform web. The breaking elongation of the constituent fibers is 100 to 300 inches, and the elongation increases when heated, making it suitable for thermoforming.

The fiber A of the constituent fibers is preferably 0.5 to 20 d. The basis weight of the nonwoven sheet is preferably 50 to 200 m''.

Next, there is no lamination in the present invention! & Long on at least one side or both sides of a sheet made of lint fiber! It refers to stacking fiber and non-woven sheets and intertwining them by needle punching or the like, or by adhering and integrating them using a hot melt adhesive method.

The configuration of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a composite sheet for molding of the present invention, in which 1 is a long fiber nonwoven sheet made of semi-drawn yarn made of a thermo-O-Td polymer, and 2 is a sheet-like sheet made of inorganic fibers. Item 3 is a long fiber made of semi-drawn yarn made of thermoplastic polymer in a sheet-like material made of inorganic fiber. According to this structure, compared to a sheet-like material made of inorganic fibers, the tensile strength and elongation rate are increased, and the fibers can be moved and deformed easily, resulting in extremely good moldability.

FIG. 2 is a schematic cross-sectional view of a composite sheet for molding of the present invention having a three-layer structure, where 4 and 5 are long fiber sheets made of semi-drawn yarns made of thermoplastic polymer, and 6 is a middle fiber sheet made of semi-drawn yarn made of thermoplastic polymer. It is a sheet-like material made of inorganic fibers. In Nos. 7 and 8, the fibers made of semi-drawn yarn in the upper and lower layers are intertwined with the fibers in the intermediate layer, so that the three nos are integrated. According to this configuration, compared to a sheet-like material made of inorganic fibers, the inorganic fibers hardly cause any flickering and do not irritate the skin even when handled.

In addition, the tensile strength and elongation rate are increased, the fibers can be easily transferred and deformed, and the moldability is extremely good.

Figure 3 is a cross section of a composite sheet for molding of the present invention having a two-layer structure.
[I is a schematic diagram in which 9 is a long fiber sheet made of semi-drawn yarn made of a thermal 0Tfi polymer, 10 is a sheet-like material made of inorganic fibers, and 11 is an adhesive for joining the two layers. . In this configuration, the adhesive gives better results if it is partially bonded in the 176 style. This is because the fibers are easily moved and deformed during molding.

According to this configuration, a composite sheet with good moldability can be obtained.

FIG. 4 is a schematic cross-sectional view of a composite sheet of the present invention molded by the convex portion of the molding machine shown in FIG. 5. Figure 5 2
The composite sheet of the present invention is heated to a total temperature of 150''C between the convex portions 24 and 24, and pressure is gradually applied to form the mold.As a result, the mold shown in FIG. 4 is obtained. A long-fiber nonwoven sheet made of semi-drawn yarn made of thermoplastic polymer No. 12 has a property of being easily stretched when heated to 150° C., so it can be easily processed during molding.

The present invention will be explained below with reference to actual examples.

The definitions and measurement methods of the characteristics shown in the practical column are as follows.

Fabric weight: Take a sample of 20crrL x 20cm and convert it to the fabric weight based on its weight and eyelid weight.

Thickness: Measure at least 3 points using a dial gauge with a load of 100 &'1ryn2, and indicate the average value.

Tensile strength and elongation (25-C): A sample of 5 m x 20 clrL was taken vertically and horizontally using a constant speed extension type tensile tester (Takatoshi Seisakusho Autograph DSS-2
000 type universal tensile test bench] gripping length 10 crrL,
Measurement is performed at a tensile rate of 20 CrIL/min.

Tensile strength and elongation at 150"C: Tensile strength and elongation at an ambient temperature of 150°C was measured in the same manner as the tensile strength and elongation at 25"C.

Glabella peel strength: Take Sample 5zxX20 (7) vertically and horizontally, peel off the interlayer portion 5α in advance, and then measure the peel strength using a constant speed extension type tensile tester.

Handling: The degree of skin irritation is indicated by touching the surface with the hands.

◎...Skin irritation is not felt at all.

○...Skin JT4 irritation is felt a little, but it is not noticeable.

Δ...Skin irritation was felt in several places.

×...Skin irritation can be felt in any part.

Moldability: The moldability is evaluated using the molding machine shown in FIG. That is, the single-sided convex shape 23 is heated to 150"C, the sample is placed between it and the flat plate 24, and pressure is applied to form the mold. After that, the pressure is stopped, the pressure is released, and the sample is removed and left. At this time, The height hO of the protrusion of the mold and the depth h of the recess of the sample are measured and used as a guide for moldability.

Moldability=-X100 h.

Measurement conditions hO: 15 mm, temperature: 15[]'C1 pressure crab 5 kl/cm2 Example 1 An example is shown in which polyethylene terephthalate is used as a melt-spun polyester synthetic fiber.

Polyethylene terephthalate with an intrinsic viscosity of 0.75 was spun using a spinneret with a hole diameter of 0.25 mm at a temperature of 295° C. Semi-drawn polyester long fibers were collected on a wire mesh at a spinning speed of 2600 m/min to obtain a fabric weight of 80 mm. g/m2
got the web. This web was heat-compressed using a pair of embossing rolls with an area ratio of 12 mm at a temperature of 65'C and a linear pressure of 20 mm.
A semi-stretched ester spunpond was obtained by thermocompression bonding at kg/CrIL. The obtained semi-stretched ester spunbond R has a basis weight of 500! Two short glass fiber nonwoven sheets of 9/m2 were stacked and intertwined by needle punching. The conditions are: needle number 66, depth 13*m, number of times 12
Performed 0 times in Z-.

Table 1 shows the properties of the composite sheet obtained. From Table 1, it is clear that the elongation at break is higher than that of Comparative Examples 5 and 6. Handling has also been improved, and the strength for eyebrow peeling has also been significantly improved. In addition, the moldability was 92%, and the moldability was extremely good.

・1 round h1 plant? Example 1 A composite sheet with a three-layer structure consisting of two sheets of semi-stretched ester spunbond R with a fabric weight of 801/m" and a non-woven glass fiber sheet with a fabric weight of 500!l/m" in the middle was prepared. Obtained by needle punching in the same manner as . Table 1 shows the properties of the composite sheet obtained. It is clear from Table 1 that the tensile strength and elongation rate increased and became stronger. or,
The cough sheet has extremely good handling and moldability. The interlayer peeling strength was also increased and the sheet was an integrated A-level sheet.

Example 6 An example is shown in which polycaprolactam is used as a melt-spun polyamide synthetic fiber.

Spinning polycaprolactam with a relative viscosity of 2.6 at a temperature of 265
℃ and a spinning speed of 3000 m from a spinneret with a pore diameter of 0.25 mm.
The semi-drawn nylon long fibers were collected on a wire mesh under spinning conditions of /min to obtain a web with a basis weight of 80 i/rn2.

This web was thermocompression bonded at a temperature of 60'C and a linear pressure of 20C and a linear pressure of 9/CWL using a -n embossing roll with a thermocompression bonding surface ratio of 8 inches to form a semi-stretched nylon spunpond. The resulting nylon spun pounds of Ushinobukon yarn and the fabric weight of 500 J! /
Two short glass fiber non-woven sheets '6 of 1" were stacked and intertwined by needle punching. The conditions were a number 36 needle, a punching depth of 13 mm, and a punching number of 120 times/GIn2. The obtained composite sheet The properties are shown in Table 1.The tensile strength and elongation rate were increased, the handling property was improved, the interlaminar peeling strength was also large, and the moldability was 96 cm, making molding very good.

Example 4 Two sheets of semi-stretched nylon spunponds with a fabric weight of 80 g/m" obtained in Example 6 were used, and a fabric weight of 500 E was used in the middle.
/ m" of short glass fiber nonwoven sheet was obtained by needle punching in the same manner as in Example 6. The properties of the obtained composite sheet are shown in Table 1. Table 1 Obviously, the tensile strength and elongation rate increased, making it stronger. Also, an integrated composite sheet with good handling properties, high interlayer peel strength, and moldability of 98% was obtained.
The composite sheet for molding was extremely good.

Comparative Example 1 Polyethylene terephthalate with an intrinsic viscosity of 0.75 was spun using a spinneret with a hole diameter of 0.25 tpx at a temperature of 295°C and a drawn polyester long fiber was collected on a wire mesh at a spinning speed of 5200 m/min. 80,! i'/
A web of m2 was obtained. This maple is heat-compressed with an area ratio of 1
A pair of 2% engines has a throttle temperature of 235'O linear pressure 4
A stretched ester spunpond was obtained by thermocompression bonding at 0 kg/α. The obtained stretched ester spunbond has a basis weight of 500
Two 17 m2 short glass fiber nonwoven sheets were overlapped and intertwined by needle punching. Double punching was carried out in the same manner as in Example 1. Table 1 shows the properties of the composite sheet obtained.

Low delamination strength and poor integration. In addition, the moldability was as low as 46%, and molding was not possible sufficiently, so Examples 1 to 4
It was quite inferior compared to

Comparative Example 2 When compared in the same manner using only a short glass fiber non-woven sheet, the tensile strength and elongation rate were extremely low, and even if this was molded, it would break and could not be molded. In addition, when handled, there is a strong tingling sensation when the product touches the hands, so sufficient care must be taken in handling, which may cause problems with peeling.

(Margins below) Example: An adhesive of ethylene-vinyl acetate was applied to a short glass fiber non-woven sheet with a fabric weight of 500/m2 in a net manner, and then an adhesive of Example 1 with a fabric weight of 80/! / rIL2 semi-stretched ester spunbond was stacked and sandwiched between belts heated at 120°C, passed through and bonded.

The moldability of the obtained composite sheet was 89 cm, indicating that a composite sheet with good moldability was obtained.

Effects of the Invention As shown in the examples, the composite sheet for molding according to the present invention has excellent handling properties, high tensile strength and elongation, and is strongly integrated. Furthermore, when molding is performed, the fibers are easily moved and deformed, so that a moldable sheet with extremely good moldability can be obtained. As a result, it can be used as a heat insulating material or a heat insulating material with an excellent design by imparting an uneven shape to the surface.

[Brief explanation of drawings]

FIGS. 1 to 4 are diagrams schematically showing cross sections of the composite sheet for molding of the present invention. FIG. 5 shows a schematic diagram of the molding machine. 1, 4.5.9.12.21. ... Long fiber interwoven sheet using semi-drawn yarn made of thermoplastic polymer, 2, 8.10.13.22... Sheet-like material made of inorganic fiber, 11... Adhesive, 20... - Composite sheet before molding, 3, 7.8.14...Shows a state in which long fibers are mixed in a sheet-like material made of inorganic fibers using semi-drawn yarns made of thermoplastic polymer. 23... Convex mold, 24... Flat plate Patent applicant Asahi Kasei Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] On at least one side of a sheet made of inorganic fibers,
A composite sheet for molding that is made by laminating and integrating long fiber nonwoven sheets made of semi-drawn yarn made of thermoplastic polymer that can be formed into fibers.