JPH0345744A - Shape-memory net - Google Patents

Abstract

PURPOSE:To obtain the subject net having excellent air-permeability and suitable for the production of clothes fitting to the body shape by using a composition composed mainly of polynorbornene as the warp and/or weft of the net. CONSTITUTION:The objective net is composed of warps and wefts. Either one or both of the warp and the weft are made of a composition composed mainly of a polynorbornene preferably incorporated with a heat-stabilizer and polyethylene. The contact point of the warp and weft is preferably bonded together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a shape memory resin material suitable for manufacturing wearable articles and the like that conform to the shape of a human body.

[Prior Art] Shape memory alloy materials have been processed and applied to surgical operations. However, it is conceivable that this shape memory alloy could be processed and used in such a way that it can be brought into direct contact with human skin, but due to its high shape memory temperature, there is a risk of skin burns, and it is hard and difficult to contact. It feels cold, and there are problems with cost and processability.

On the other hand, resin compositions containing polynorbornene as a main component can have a secondary transition point close to the human body temperature. It is also possible to memorize the shape and use it for making molds, etc. However, the shape of the body is made up of complex curved surfaces, and even though it is possible to partially stretch flat sheets when they are brought into contact, wrinkles and folds occur, and it is impossible to make them fit closely together. There are drawbacks that cannot be overcome.

[Problems to be Solved by the Invention] The inventors conducted research on a structure that retains the characteristics of the composition containing polynorbornene as a main component and can adhere closely to the skin without causing wrinkles or folds. The inventors have discovered that by stacking and molding polynorbornene compositions to form a net, the degree of freedom of plastic deformation is greatly increased and the ability to adhere to curved surfaces has been achieved, leading to the completion of the present invention. Here, the term "net" refers to both those in which the warp and weft contact points of the net are not fixed, and those in which the contact points of the warp and weft are fixed integrally.

[Means for Solving the Problems] According to the present invention, there is provided a net consisting of warp and weft yarns, in which at least one of the yarns is obtained from a composition containing polynorbornene as a main component. A shape-memory net body characterized in that both yarns are obtained from a composition obtained by adding a heat stabilizer and polyethylene to polynorbornene, and the contact points of the warp and weft of the net are integral. A shape memory network is provided, the shape memory network being bonded to.

That is, by using fibers obtained from a composition containing polynorbornene as a main component for at least one of the warp and weft threads of the mesh, flexibility and freedom of plastic deformation in three-dimensional directions are improved. It is possible to increase the size greatly and adhere closely to complex curved surfaces.

Next, the warp or weft that forms the net can be made, for example, as follows.

■ Spinning method A rod-shaped body with an appropriate diameter is made using a composition whose main component is polynorbornene with a specified composition, and this is repeatedly stretched and heat-treated at an appropriate heating temperature to form a filament with a specified diameter. .

(2) Film cutting method A film of an appropriate thickness is made using a composition containing polynorbornene as a main component, and this film is sheared or cut into narrow strips to form filaments.

The filaments obtained as described above are used to weave into a net. Generally, it is a plain weave, but of course other weaving types may be used.

In the case of a plain weave structure, depending on the application, both the warp and weft of the net are made of a polynorbornene composition, or one of them is made of a polynorbornene composition and the other is made of synthetic fibers or natural fibers. In the latter case, the feel when in contact with the skin can be improved.

The thickness of the threads of the net and the size of the mesh can be appropriately selected depending on the purpose of use.

In addition, the intersections of the warp and weft threads of the net may be integrally connected, for example, by fusion or binding, and by doing so, in the case of a large mesh, when the net is plastically deformed,
It is possible to prevent the mesh from becoming disordered.

[Function] Since the net body obtained from the polynorbornene composition according to the present invention has a secondary transition point close to human body temperature, it can be heated at a temperature within an appropriate range from body temperature without fear of causing burns, that is, 35 to 60℃. ℃
Since it is made of a net, it can be brought into close contact with the skin without creating wrinkles or folds, and it has good wearability on the human body (breathability with the skin, texture).

In addition, polynorbornene compositions have the ability to quickly recover their original shape, and unlike metal alloys, molded products that are hardened and memorized in a shape that matches the human body can withstand surface deformation due to body movements for a long time with weak force. Since it acts continuously, there is no risk of irritation when wearing it.

Furthermore, by reheating to a temperature higher than the secondary transition point, the holding shape can be easily changed.

[Example] The present invention will be explained in more detail with reference to Examples.

Example 80 parts of polynorbornene resin powder (manufactured by France's CdF, trade name Nosolex), 20 parts of low-density polyethylene, and 2 parts of a heat stabilizer were kneaded and extruded to form a round bar with a diameter of 2 mm. The secondary transition point of this product was 34°C.

The above-mentioned round bar is rolled to 300% or less at around 80°C and heat treated. This operation was repeated to create a 90 denier filament.

Using this filament, a plain weave net with a vertical and horizontal pitch of 0.5 mm was made, and from this net a cylindrical body with a diameter slightly smaller than that of an adult's hand was made. The seams of the cylindrical bodies were tied together with cotton thread.

The cylindrical body was immersed in a humid temperature of 40° C. to expand its diameter, taken out of the hot water, inserted a hand into the expanded cylindrical body, and immersed in hot water again with the hand inserted.

At this time, due to the properties of the shape memory resin, the net cylindrical body contracted and deformed into a shape that closely fit the hand. Instead of immersing in this hot water, it may be heated with a hot air dryer or the like.

Next, it is immersed in cold water to cool and harden, the binding cotton thread is pulled out, the joint is expanded using the elasticity of the tube, and it is removed from the hand to obtain a hard net made of the same shape as the hand. did it.

[Effects of the Invention] As shown in the above embodiments, according to the present invention, the net has a secondary transition point near the human body temperature, so it can accurately memorize the curved shape of the human body by directly touching the skin. It is useful as a molding material for clothing because it can fix the memorized shape.

Furthermore, since the net has excellent breathability, it can be made into a cylindrical shape to protect the elbows and
Knee pad supporter 1 Can be used inside shoes, sock blades, etc.

In addition, it has the advantage that it can be used as a lining for clothing that fits the body, and that even when the clothing is ironed, it does not lose its shape and can be returned to its original shape.

Claims (1)

[Claims] 1. A shape memory net consisting of warp and weft yarns, characterized in that at least one of the net yarns is obtained from a composition containing polynorbornene as a main component. Gender reticular formation. 2. A shape memory net consisting of warp yarns and weft yarns, wherein at least one of the yarns of the net yarn is obtained from a composition obtained by adding a heat stabilizer and polyethylene to polynorbornene. Gender reticular formation. 3. A net consisting of warp and weft yarns, the net yarns being obtained from a composition made by adding a heat stabilizer and polyethylene to polynorbornene, and the points of contact between the warp and weft yarns being integrally bonded. Shape memory net.