CN201553838U - A thermosensitive shape memory polyurethane covered yarn - Google Patents

Abstract

The utility model discloses a thermosensitive shape memory polyurethane covered yarn which comprises a central yarn and a wrap yarn coated outside the central yarn, the central yarn adopts a thermosensitive shape memory polyurethane filament, and the diameter ratio between the wrap yarn and the central yarn is 0.1 to 1.0. Compared with the covered yarn structure of other fibers, the thermosensitive shape memory polyurethane provided by the utility model has stronger fabric wrinkling prevention capability and better elasticity, is easy to be recovered to initiate form and can be widely used.

Description

A thermosensitive shape memory polyurethane covered yarn

technical field

The utility model relates to the field of textiles, in particular to a covering yarn formed of heat-sensitive shape-memory polyurethane and other fibers.

Background technique

Since the 1990s, with the development of my country's textile industry, the production of covered yarns has shown a trend of diversification of varieties and functions. Covered yarn is a new type of yarn structure. It uses filament as the yarn core and wraps another filament or spun yarn. The outer covering yarn wraps the core yarn in a spiral manner. It is characterized by evenness, bulkiness, smooth yarn with less hairiness, high strength and less broken ends. Covering yarn According to the application, select the appropriate core yarn and outer covering yarn, and its strength is higher than any single yarn. Although covered yarn has been more and more widely used.

Heat-sensitive shape memory refers to the property that a product with an initial shape (initial state) can be restored to its original shape by the action of heat after it is deformed and fixed (morphologically deformed). The most promising and most important applications of shape memory materials are mainly in the fields of biomedicine, textiles and apparel, toys, packaging, and national defense. In weaving, it can be used as a yarn core and other various fibers to spin various yarns with shape memory effect.

Chinese invention patent 200410049303.9 discloses a shape-memory fiber prepared from shape-memory polyurethane and a preparation method thereof. The shape-memory polyurethane is composed of raw materials, organic hydroxyl-containing polymer, chain extender, diisocyanate, and end-capping agent, and its molar ratio is 1:1-3:2.4-4.8:0.8-1.6 prepared. The preparation method of the shape-memory fiber provided by the present invention comprises step (1): preparing shape-memory polyurethane with excess isocyanate; and step (2): adding a blocking agent to the polyurethane obtained in step (1) to obtain a blocked shape-memory polyurethane , and the shape memory fibers were prepared by melt spinning. The shape memory fiber provided by the present invention has an extremely wide temperature adjustment range, and it shows good practical performance in terms of elasticity, strength, shape memory performance, etc., and has a comfortable hand feeling, and is easy to spin alone or blend with other synthetic fibers and natural fibers , It has been widely used in the fields of textile and clothing, biomedical materials and so on.

However, there is still little research on the specific structure of shape memory polyurethane-coated yarn, and the coating structure will have a very important impact on the strength and quality of the yarn.

Contents of the invention

The utility model provides a heat-sensitive shape-memory polyurethane coated yarn with good strength and superior memory performance.

A heat-sensitive shape-memory polyurethane covered yarn, comprising a central yarn and an outer yarn covered on the surface of the central yarn, the central yarn is a heat-sensitive shape-memory polyurethane filament; the diameter of the outer yarn is the same as that of the central yarn The diameter ratio is 0.1 to 1.0.

Preferably, the ratio of the diameter of the outer covering yarn to the diameter of the central yarn is 0.2-0.5.

When the yarn is stretched to breakage, not all the central yarns and all the outer covering yarns are broken on the broken section, but a part of the fibers is broken, and another part of the fibers slips off, and the broken part of the fibers is not at the same time. Fracture, this kind of fracture performance and single yarn strength is closely related to the covering ratio of the outer covering yarn. As the diameter ratio of the outer covering yarn to the diameter of the central yarn increases, the friction between the yarns decreases, and the outer covering yarn and the center yarn It is easy to slide between the center yarns, and if the ratio is too large, the stress distribution between the yarn center yarn and the outer yarn fibers will be uneven, which will aggravate the non-synchronicity of fiber breakage and reduce the strength and elasticity of the yarn; otherwise, the ratio will shrink , the requirements for cladding machines are constantly increasing, and the corresponding production costs are also increasing. Therefore, when the ratio of the diameter of the outer yarn to the diameter of the central yarn is 0.2 to 0.5, the shape fixation rate of the tested yarn reaches more than 84%, the shape recovery rate reaches more than 81%, the shape memory effect is better, and the strength of the yarn , elasticity and gloss are in a relatively good state.

The yarn type of the covering yarn can be staple fiber single yarn, strand or filament.

When the covering yarn is covered, a single yarn, multiple yarns of the same type or multiple different yarns can be selected for covering. When the covering yarn is covered with multiple threads in the same direction, it is better The woven fabric has a better appearance after dyeing.

The covering form of the outer covering yarn is same-direction covering or cross covering, and the same-direction covering is S-direction covering or Z-direction covering.

The non-uniformity of the covered yarn yarn structure is less than 12%.

The outer covering yarn can be selected from one or more of cotton fibers, wool fibers, hemp fibers, silk fibers and chemical fibers according to the cloth for different purposes. The fabric formed by choosing cotton fiber as the outsourcing yarn has good air permeability, hygroscopicity and comfort, and also has good elasticity and shape recoverability. The fabric formed by using wool fiber as the outsourcing yarn is high-grade, comfortable, has good thermal insulation and air permeability, and has good elasticity and plasticity. The fabric formed by using hemp fiber and silk fiber as outsourcing yarn is natural, can be worn next to the skin, has good luster, good elasticity, anti-wrinkle, and is easy to recover after denaturation. The fabric formed by using chemical fiber as the outsourcing yarn is low in price, high in wear resistance and good in shrinkage, and has a wide range of uses.

The heat-sensitive shape-memory polyurethane and other fiber-coated yarns and fabrics of the utility model are soft and wear-resistant, have strong wrinkle resistance, good elasticity, and are easy to dye. At a certain temperature, the yarns and fabrics are easier to return to the original state of its memory. The elimination of deformation can be widely used in the manufacture of clothes such as shirts and suits, and the covered yarn can also be used to produce fabrics with excellent performance in various patterns, colors, and elastic strength.

Description of drawings

Fig. 1 is the schematic diagram of the structure of the heat-sensitive shape-memory polyurethane-coated yarn of the present invention;

Fig. 2 is a structural schematic diagram of another embodiment of the heat-sensitive shape-memory polyurethane-coated yarn of the present invention;

Fig. 3 is a schematic structural view of the third embodiment of the heat-sensitive shape-memory polyurethane-coated yarn of the present invention.

Detailed ways

Example 1

Referring to Fig. 1, the heat-sensitive shape-memory polyurethane covered yarn of the present invention is composed of a central yarn 21 and an outer covering yarn 22 wrapped on the surface of the central yarn 21, and is covered with a single outer covering yarn.

The central yarn 21 is made of heat-sensitive shape memory polyurethane filament, the outer yarn 22 is made of combed cotton single yarn, and the ratio of the diameter of the outer yarn to the diameter of the central yarn is 0.3. The cladding direction is S.

The deformation recovery temperature of heat-sensitive shape-memory polyurethane-coated yarn is 30°C to 70°C. At room temperature, the heat-sensitive shape-memory polyurethane-covered yarn maintains the original straight shape, and the covered yarn deforms after repeated stretching and bending. Put the covered yarn into 45°C water, and the covered yarn will quickly return to its original shape. When the covered yarn is not subjected to external force and the temperature drops to normal temperature, the covered yarn still maintains the original straight shape. When the covered yarn is subjected to an external force of 328cN or greater, the covered yarn breaks.

Example 2

Referring to Fig. 2, the heat-sensitive shape-memory polyurethane covered yarn in this embodiment is composed of a central yarn 31 and an outer covering yarn 32 covering the surface of the central yarn 31, and is covered with two outer covering yarns.

The central yarn 31 is made of heat-sensitive shape memory polyurethane filament, the outer covering yarn 32 is made of polyester yarn, and the ratio of the diameter of the outer covering yarn to the diameter of the central yarn is 0.5. The cladding direction is S.

The deformation recovery temperature of heat-sensitive shape-memory polyurethane-coated yarn is 30°C to 70°C. Put the covered yarn into 50°C water, and the covered yarn will quickly return to its original shape. When the covered yarn is not subjected to external force and the temperature drops to normal temperature, the covered yarn still maintains the original straight shape. When the covered yarn is subjected to an external force of 403cN or greater, the covered yarn breaks.

Example 3

Referring to FIG. 3 , the heat-sensitive shape-memory polyurethane covered yarn in this embodiment is composed of a central yarn 41 and an outer covering yarn 42 covering the surface of the central yarn 41 , and two outer covering yarns are cross-wrapped.

The central yarn 41 is made of heat-sensitive shape memory polyurethane filament, one of the outer yarns 42 is made of combed cotton single yarn, and the other outer yarn 43 is made of polyester yarn, and the ratio of the diameter of the two outer yarns to the diameter of the central yarn is 0.5 .

The deformation recovery temperature of heat-sensitive shape-memory polyurethane-coated yarn is 30°C to 70°C. Put the covered yarn into water at 42°C, and the covered yarn quickly returns to its original shape. When the covered yarn is not subjected to external force and the temperature drops to normal temperature, the covered yarn still maintains the original straight shape. When the covered yarn is subjected to an external force of 647cN or greater, the covered yarn breaks.

Claims (5)

1. a temperature-sensitive shape memory polyurethane wrap yarn comprises center yarn and the outsourcing yarn that is coated on yarn surface, center, and it is characterized in that: described center yarn is a temperature-sensitive shape memory polyurethane long filament; The diameter of described outsourcing yarn is 0.1～1.0 with the diameter ratio of center yarn.

2. temperature-sensitive shape memory polyurethane wrap yarn as claimed in claim 1 is characterized in that, the diameter of described outsourcing yarn is 0.2～0.5 with the diameter ratio of center yarn.

3. temperature-sensitive shape memory polyurethane wrap yarn as claimed in claim 1 or 2 is characterized in that, described outsourcing yarn is one or more in cotton fiber, wool fibre, flax fibre, silk fiber, the chemical fibre.

4. temperature-sensitive shape memory polyurethane wrap yarn as claimed in claim 3 is characterized in that, the coating form of described outsourcing yarn coats for coating in the same way or intersecting.

5. temperature-sensitive shape memory polyurethane wrap yarn as claimed in claim 4 is characterized in that, described intersection coats and adopts two outsourcing yarns, and wherein an outsourcing yarn is a cotton fiber, and another root outsourcing yarn is a terylene thread.

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