JPS63194939A - Air-permeable laminate working method - 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 method for manufacturing a breathable composite material. This invention relates to a breathable laminating method that can be usefully used as an adhesive layer or reinforcing layer for composite materials using chemicals, or as a heat-sealing layer for containers for contents that require ventilation and moisture permeability, such as containers for natto. be.

"Prior Art and Problems" Conventionally, the method for manufacturing breathable composite materials involves laminating a thermoplastic resin film onto a breathable material such as paper or cloth, and then making holes in the film by hot needles, punching, etc. There are two methods: a method of perforating, and a method of bonding a thermoplastic resin film with pre-perforated holes to a breathable material using heat.

However, all of these methods have two steps,
This inevitably leads to high costs.

There is also a method of forming a resin layer in the form of dots or lines, but since ordinary laminating machines are designed to form a continuous film, special equipment and equipment are required.

Furthermore, Japanese Patent Application Laid-Open No. 60-234828 proposes a method for producing a breathable material by foam extrusion using water, but this method has the drawbacks that the foaming state is not constant and the pore size cannot be controlled. .

"Means for solving the problem" The present invention solves the problem of ridges by mixing a foaming agent with a thermoplastic resin and melting and foaming the mixture using a T-die extruder. In addition to stabilizing the foaming state, the pore size can be controlled by combining and controlling the extrusion processing temperature, the gas generation temperature from the blowing agent, the melt viscosity of the thermoplastic resin, the compatibility of the foaming gas and the thermoplastic resin, etc. We succeeded in controlling the air permeability and providing the desired air permeability.

That is, in the present invention, a blowing agent is mixed with a thermoplastic resin, the mixture is melt-foamed and extruded using a T-die method extruder to form a breathable resin sheet having desired breathability, and this is laminated with a breathable base material. The content is a breathable laminate processing method that is characterized by its composite properties.

Thermoplastic resins used in the present invention include polyolefin resins, polyester resins, polyamide resins, polystyrene resins, polyurethane resins, and those commonly called ``Kifire'' (terpene resins, rosin resins, maleic acid resins, resins, phenolic resins, aromatic petroleum resins, etc.) that can be extruded using a T-die extruder, and polyolefin resins are particularly suitable. These polyolefin resins include polyethylene, polypropylene, polybutene, ethylene,
Vinyl acetate copolymer, ethylene/acrylic acid copolymer, ethylene/ethyl acrylate copolymer, ethylene/methacrylic acid copolymer, ethylene/methyl methacrylate copolymer, etc.

is the most suitable. The above thermoplastic resin is 1 type or 2M
Used as a mixture of the above.

The blowing agent used in the present invention is a substance with a boiling point lower than the heat distortion temperature of the thermoplastic resin, and organic blowing agents include aliphatic hydrocarbons, halogenated aliphatic hydrocarbons, and others. . Examples of aliphatic hydrocarbons are saturated aliphatic hydrocarbons such as propane, butane, pentane, hexane, and unsaturated aliphatic hydrocarbons such as propylene, butene. Further, examples of halogenated aliphatic hydrocarbons include methyl chloride, methylene chloride, dichlorodifluoromethane, and the like. Other organic blowing agents include azodicarbonamide (ADCA), azobisisobutyronitrile (AIBN), N,N'-dinitrosopentamethylenetetramine (DPT), P-)luenesulfonylhydrazide (TSH), P, Common foaming agents for plastics such as P'-oxybis(benzenesulfonylhydrazide) (OBSH) are used. These things are 1
A species or a mixture of two or more kinds can be used.

In the present invention, in addition to the above-mentioned organic blowing agents, an inorganic compound containing water of crystallization is used as a blowing agent. It refers to an inorganic compound containing water (water, structured water) and dwarf water, and particularly preferred ones include gypsum, magnesium hydroxide, aluminum hydroxide, and the like. These inorganic blowing agents may be used alone or as a mixture of two or more.

For mixing thermoplastic resin and blowing agent, perform tri-blending and directly feed into T-die method extruder.
There is no problem with extrusion processing.

Further, it is also possible to apply -S to the methods used in the mixing and dispersion method, such as the use of a dispersant, a surface treatment agent (particularly in the case of an inorganic material), and the use of spreading and cutting.

The mixing ratio of the blowing agent varies depending on the amount of foaming gas generated by the blowing agent, the extrusion temperature, the melt viscosity of the resin, the weight of the laminate, etc.
Usually 0.05 to 5 parts by weight per 100 parts by weight of thermoplastic resin
It may be selected from 0 parts by weight, preferably 11 to 5.0 parts by weight.

In the present invention, various types of nucleating agents such as tackifier, calcium carbonate and silica, anionic, cationic, nonionic and amphoteric surfactants are used to control the pore size, as described below. Surfactants, especially esters of polyhydric alcohols (ethylene glycol, glycerin, etc.) and fatty acids, are preferably used, and other commonly used additives are added. Used to adjust compatibility with plastic resins.

Examples of the breathable base material used in the present invention include paper, nonwoven fabric, and woven fabric.

By employing a foaming agent in the present invention, the pores can be controlled as described below, and therefore a composite material having desired air permeability can be obtained.

(1) Adjustment to approximate the foaming decomposition temperature of the blowing agent and the resin extrusion temperature (slightly higher than the foaming decomposition temperature) (2) Adjustment of the decomposition products (water, N z , CO, etc.) and the extruded resin Adjustment of compatibility The above adjustment is based on the type of resin, the type of blowing agent, the blending ratio of both, the melt viscosity of the blend, and the tackifier mentioned above.
This can be done by adding a nucleating agent, a surfactant, changing the processing temperature, etc. These depend on the desired hole size;
- Although it cannot be specified in detail, some indicators are given: When using the same material under the same processing conditions, use a foaming agent with good dispersion, or improve the dispersion (the pores will become smaller).

Also, if the same material is processed at a higher processing temperature, the holes will become larger.

Furthermore, under the same processing conditions, if the foaming gas has good compatibility with the resin, the pores will become smaller, and if a blowing agent with a lower foaming gas generation temperature is used, the pores will become larger.
If a blowing agent that produces a large amount of foaming gas is used, the pores will become large, and if a resin with a low melt viscosity is used, the pores will become large.

FIG. 1 and FIG. 2 each show an enlarged model diagram of an air-permeable laminate film, in which (1) is a hole and (2) is a laminated resin film layer.

"Examples" The present invention will be described below with reference to Examples, but the present invention is not limited in any way by these.

Example 1 As a thermoplastic resin, low density polyethylene resin [Milason M-16P (Ml-3.7 g/10 min, density-0,
923g/aJ) J (manufactured by Mikata Polychemical) 94
using 6.0 parts by weight of the terpene resin "Clearon P-125 (softening point 125°C, density 0.996 g/cj)" (manufactured by Yasushi Oil Industries), and 1.0 parts by weight of gypsum (manufactured by Hexagonal Gypsum) as a foaming agent. Parts by weight were triblended with the above thermoplastic resin. The mixture was passed through a T-die extruder (T
-Gui-400 wire cloth (extruder screw diameter: 40 mm), extruded at extrusion resin temperature of 295°C, sandwiched between two non-woven fabrics using a laminator, pressed with a press roll, and laminated. (laminate weight 115 g/n?).

The nonwoven composite material thus prepared had good adhesion without impairing air permeability, and had a good texture. Further, the laminated resin mode was as shown in FIG. 2, and the air hole area ratio was about 80% of the whole.

Example 2 As a thermoplastic resin, polypropylene resin "Three Piece Polypro LA-221 (Ml-25, 0 g/10 min, density = 0.
Tri-blend 100 parts by weight of J (manufactured by Mikata Petrochemical) and 1.0 part by weight of aluminum hydroxide [Hisilite H-32 (average particle size 3.5 μm) J (manufactured by Showa Light Metal) as a foaming agent. After that, it was extruded using a T-die extruder in the same manner as in Example 1 (resin temperature 300°C), and cup paper (basis weight 220 g/rtr,
(manufactured by Shinetsu Pulp) was laminated on top.

The moisture permeability of the breathable laminate material created in this way is
1.457 g/rrr ・24hrs (J I
5-Z-0208B method), and the heat sealability was similar to that of ordinary laminated products, making it suitable as a material for heat-sealable moisture-permeable containers. The moisture permeability of cup paper without lamination is 19537 g/rd.
, 24 hours.

"Effects of the Invention" The breathable laminating method of the present invention has many features as described below.

■Breathability can be imparted using the same processing method as normal lamination, so compared to conventional methods, the manufacturing process is shortened and special equipment is not required, making it possible to manufacture breathable composite materials at low cost. becomes possible.

■The present invention provides adhesive layers, reinforcing layers,
It is useful not only as a heat-sealing layer, but also as an adhesive layer, reinforcing layer, and heat-sealing layer for fabrics, nonwovens, etc. where texture is important, and the amount of resin used as an adhesive layer is lower than that of normal lamination (all-over resin layer). It is also useful from the standpoint of resource conservation as it requires less energy.

■Also, the breathable laminate surface of the present invention can be made from a mesh shape to a perforated surface, and the shape is a random pattern, so it can be applied to beautiful laminate products. You can also do that.

■The size of the pores can be adjusted by appropriately combining or adjusting the type of resin, the type of blowing agent, the amount of both, the melt viscosity of the compound, the addition of tackifier, nucleating agent, surfactant, processing temperature, etc. Therefore, the ratio of the vent area to the laminated resin film area can be freely changed depending on the purpose.

[Brief explanation of the drawing]

Figures 1 and 2 are enlarged schematic diagrams of the breathable laminated resin film of the present invention, and in each figure, (A
) is a plan view, and (B) is a sectional view. 1... Hole 2... Laminate resin film layer Figure 1 Figure 2 (A) (B) Procedural amendment words and actions) % formula % 2. Name of the invention Breathable laminating method 3゜ Amendment case Relationship with: Patent applicant Address: 4-13-18 Anritsu, Suminoe-ku, Osaka Name: Goyogiko Co., Ltd. Representative: Kojibe Hirose 4, Agent address: 3-2-4 Nishitenma, Kita-ku, Osaka 5. Date of amendment order Page 1 of the specification, between the third and second lines from the bottom, “3.
Insert "Detailed Description of the Invention".

Claims (1)

[Claims] 1. A blowing agent is mixed with a thermoplastic resin, and the mixture is melt-foamed and extruded using a T-die method extruder to form a breathable resin sheet having desired breathability, and this is used as a breathable base material. A breathable laminating method that is characterized by laminating and compounding. 2. The processing method according to claim 1, wherein the blowing agent is one or a mixture of two or more selected from organic blowing agents and inorganic compounds containing water of crystallization such as gypsum and aluminum hydroxide. 3. The processing method according to claim 1 or 2, wherein the thermoplastic resin is a polyolefin resin. 4. The processing method according to claim 1, 2, or 3, wherein one or more selected from tackifier, nucleating agent, and surfactant are added.