TW201930668A - High-transparency-resistance core sheath composite fiber and fabric - Google Patents

Abstract

Disclosed in the present invention is a high-transparency-resistance core sheath composite fiber. The fiber is a core sheath composite section morphology, core components contain high-concentration inorganic particles, and the concentration of inorganic particles in sheath components is low. The obtained fiber has good spinning processing performance, and has outstanding transparency resistance, ultraviolet resistance and heat prevention performance. When the high-transparency-resistance core sheath composite fiber in the present invention is used in weaving processing, the fabric with good transparency resistance, ultraviolet resistance and heat prevention performance is obtained.

Description

   High-permeability-resistant core sheath composite fiber and fabric   

The invention relates to a high-permeability-resistant core-sheath composite polyester fiber and a fabric using the fiber, and more particularly, to a high-permeability-resistant and ultraviolet-resistant core-sheath composite polyester fiber containing a high content of inorganic particles in a core component.

Visual obscurity is an important property of textiles. In the field of clothing, it is related to the most basic function of shading body. In the field of decoration and military, it has special visual requirements such as unidirectional perspective and camouflage. In addition, with the worldwide use of halothane and the increasingly serious environmental pollution, the ozone layer in the atmosphere has been severely damaged. Long-term exposure to ultraviolet rays will reduce the life of organic molecules and reduce the immune function of the human body. It will not only damage the skin and cause dermatitis, erythema, freckles and skin cancer, but also promote eye diseases and cause cataract diseases. In addition, especially the summer is hot, and clothing with a certain heat-shielding performance has become the pursuit of consumers.

Therefore, fiber woven fabrics with high permeability, UV resistance, and heat shielding properties are one of the growing public demands.

Chinese patent CN201510289564.6 discloses an orange petal anti-perspective fiber. The fiber uses TiO ₂ particles to achieve the anti-permeability effect, and the opacity can reach 99% ~ 100%. However, the fiber TiO ₂ particles exist in the fan-shaped part of the fiber cross section, and a part of the fibers is exposed on the fiber surface. Post-processing will cause the TiO ₂ particles to fall off, affecting processability and contaminating processing equipment. In addition, the TiO ₂ particles in the fiber are unevenly distributed. The TiO ₂ particles are a kind of white particles that affect the dyeing of the fiber. The uneven distribution of the TiO ₂ particles in the fiber will cause streaks after dyeing the fabric and affect the quality. The use of this fiber is therefore limited.

Circular cross-section fibers containing a high concentration of TiO ₂ are exposed to a large number of inorganic particles during spinning and post-processing, and the silk process is poor in passability. Moreover, the falling off of TiO ₂ particles easily pollutes the equipment, making it difficult to directly spin.

The object of the present invention is to provide a core-sheath composite fiber and a fabric formed of the core-sheath composite fiber, which have high anti-transmission, ultraviolet resistance, and good heat shielding performance.

The technical solution of the present invention is: a high-permeability-resistant core-sheath composite fiber, the ratio of the core component to the sheath component in the cross-section of the core-sheath composite fiber is 50 ~ 95: 50 ~ 5; Inorganic particles A having a content of 5.0 to 30.0 wt%; and the above-mentioned sheath component contains inorganic particles B that account for 3.0 wt% or less of the sheath component.

The average particle diameter of the inorganic particles A in the core component is preferably 1.50 μm or less.

The inorganic particles A and B are preferably titanium dioxide at the same time.

The inorganic particles A are preferably rutile-type titanium dioxide.

Relationship between viscosity and viscosity IV IV _core polymer constituting the _sheath component of the sheath is preferably based polymer constituting the core component of the formula 1, IV -IV _core-sheath = -0.3dl / g ~ 0.5dl / g (Formula 1); more preferably, as shown in Formula 2, the IV _core- IV _sheath = -0.2dl / g to 0.3dl / g (Formula 2).

The core component preferably contains inorganic particles A which account for 7.0 to 25.0 wt% of the core component; and the sheath component preferably contains inorganic particles B which accounts for 1.0 to 3.0 wt% of the sheath component.

The average particle diameter of the inorganic particles A in the core component is preferably 1.00 μm or less.

The invention also discloses a fabric, which is prepared from the above-mentioned high-permeability-resistant core-sheath composite fiber.

The sum of the inorganic particles A and B in the fabric preferably accounts for 4.0 to 25.0 wt% of the fabric; the inorganic particles A and B are both preferably titanium dioxide, and the inorganic particles A are preferably rutile titanium dioxide. .

The core component of the core-sheath composite fiber disclosed in the present invention contains high content of inorganic particles. The core-sheath composite fiber and the fabric formed by the core-sheath composite fiber have the characteristics of high permeability resistance, ultraviolet resistance and heat shielding.

The ratio of the core component to the sheath component in the cross section of the core-sheath composite fiber of the present invention is 50 to 95: 50 to 5, wherein the core component contains 5.0 to 30.0 wt% of the inorganic particles A and the sheath component in the core component. The inorganic particles B are contained in an amount of 3.0% by weight or less of the sheath component.

The ratio of the core component to the sheath component in the core-sheath composite fiber is 50 to 95:50 to 5. If the ratio of the core component to the sheath component in the core-sheath composite fiber is less than 50:50, since the fiber's permeability resistance, ultraviolet resistance, and heat-shielding properties are mostly dependent on the core component with a high content of inorganic particles, the core component content is too low to show Due to the anti-permeability, anti-ultraviolet, and heat-shielding properties; if the ratio of the core component to the sheath component is greater than 95 ~ 5, general composite spinning becomes difficult, and the thickness of the sheath component is not sufficient to completely cover the core component, resulting in A large number of inorganic particles are exposed, which damages the spinning equipment during high-speed spinning. In addition, the exposed inorganic particles easily fall off, which affects the core-sheath composite fiber's anti-permeability, ultraviolet resistance, and heat shielding performance.

The content of the inorganic particles A in the core component is 5.0 to 30.0 wt% based on the total weight of the core component. When the content of the inorganic particles A in the core component is higher than 30.0wt%, the spinning performance will be affected, and the yarn breakage and floating phenomenon will easily occur during the spinning process, and the strength of the obtained core-sheath composite fiber is poor, which affects its subsequent use; When the content of inorganic particle A in the composition is less than 5.0% by weight, although it does not cause problems in spinning performance and physical properties of the core-sheath composite fiber, a small amount of inorganic particles will not be conducive to the reflection and absorption of light, and the core-sheath composite fiber will be transparent The properties of UV resistance, UV resistance and heat-shielding performance have been greatly reduced, and the required level cannot be achieved. Therefore, considering the permeability, ultraviolet resistance, heat shielding performance, and production feasibility of the core-sheath composite fiber, the content of the inorganic particles A in the core component of the present invention is preferably 7.0 to 25.0 based on the total weight of the core component. wt%.

The average particle diameter of the inorganic particles A in the core component is preferably 1.50 μm or less. When the average particle diameter of the inorganic particles A is too large, the inorganic particles A easily block the filter in the spinning element during the spinning process, causing the element pressure to rise rapidly, exceeding the upper limit of the usable pressure of the element in a short time, and must be stopped. Affects productivity; At the same time, the interrupted yarn and spinning yarn increase during the spinning process, which affects the spinning workability and the basic physical properties of the fiber. When the average particle diameter of the inorganic particles A is too small, the possibility of secondary agglomeration of the inorganic particles A in the core component is high, which affects the service life of the spinning element. Therefore, in the present invention, the average particle diameter of the inorganic particles A is preferably 1.50 μm or less, and more preferably 1.00 μm or less.

The above-mentioned sheath component may or may not contain the inorganic particles B. When the inorganic particles B are contained, the content thereof is 3.0% by weight or less of the total weight of the sheath component. When the content of the inorganic particles B in the sheath component is higher than 3.0% by weight, the possibility of the inorganic particles B falling off is increased because the inorganic particles B are exposed on the surface, and the inorganic particles B usually have a large hardness. The friction of the wire guide of the machine can easily damage these components. In terms of improving the permeability of the polymer fiber, the content of the inorganic particles B in the sheath component of the present invention preferably accounts for 1.0 to 3.0 wt% of the weight of the sheath component.

The inorganic particles A and B may be titanium dioxide, calcium carbonate, barium sulfate, zinc oxide, silicon dioxide, boron nitride, or the like. Among these, titanium dioxide, calcium carbonate, barium sulfate, and zinc oxide are preferred. The inorganic particles A and B may be two different compounds, or they may be the same compound. In order to obtain a core-sheath composite fiber having higher permeability and ultraviolet resistance, it is preferred in the present invention that the inorganic particles A and B are titanium dioxide at the same time.

According to different crystal forms, titanium dioxide is divided into anatase-type titanium dioxide and rutile-type titanium dioxide. The crystal structure of anatase-type titanium dioxide generally used is unstable and easily generates free radicals. When the free radicals accumulate to a certain amount, it will affect the light fastness of the polymer. Therefore, when the fiber contains a large amount of anatase titanium dioxide, the light resistance of the fiber becomes poor. In order to obtain more excellent light fastness to the fiber, the inorganic particles A of the present invention preferably use rutile titanium dioxide.

The polymer constituting the core component is not particularly limited in the present invention, and includes various thermoplastic polymers. It can be a polyester polymer or a polyamide polymer, or a polyolefin polymer. Specifically, the above-mentioned polyester-based polymer may be a homopolymer such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, or a copolymer thereof. The above polyamine polymers may be polyamine 6, cationic dye-dyeable polyamine 6, polyamine 66, etc .; the above polyolefin polymers may be polyethylene, polypropylene, polybutadiene Wait.

The polymer constituting the sheath component is not particularly limited in the present invention, and includes various thermoplastic polymers. Depending on the polymer material, the sheath component can be a polyester polymer or a polyamide polymer, or a polyolefin polymer. Specifically, the above-mentioned polyester-based polymer may be a homopolymer such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, or a copolymer thereof. According to different functions, the above-mentioned polyester polymers can be disperse dyeable polyester, cationic dyeable polyester, easily soluble polyester, conductive polyester, antistatic polyester, hygroscopic polyester, and low friction. Polyesters, etc .; the aforementioned polyamide polymers may be polyamide 6, cationic dye-dyeable polyamide 6, polyamide 66, etc .; the aforementioned polyolefin polymers may be polyethylene, polypropylene, polybutylene Diene, etc. According to the content of the inorganic particles B in the sheath component, the sheath component may be a large-gloss polymer, a semi-gloss polymer, or a full-gloss polymer, such as a large-gloss polyester, a semi-gloss polyester, or a full-gloss polyester. In the present invention, the polymer constituting the sheath component is preferably a fully dull polyester and a cationic dyeable polyester having an inorganic particle B content of 1.0 to 3.0 wt%.

The form of the fiber is not particularly limited in the present invention, and may be a long fiber or a short fiber.

In a preferred technical aspect, in the present invention, the viscosity of the polymer constituting the core component and the polymer constituting the sheath component is limited. Relations Department preferred viscosity IV of the core component of the _core polymer and the _sheath polymer viscosity IV of the sheath component constituting the above-described formula 1, IV -IV _core-sheath = -0.3dl / g ~ 0.5dl / g ( Formula 1), more preferably, as shown in Formula 2, IV _core- IV _sheath = -0.2dl / g ~ 0.3dl / g (Formula 2).

When the value IV -IV _core-sheath is too large, i.e. when the viscosity IV _{of the core} component polymer constituting the core is too high, general clothing with melt spinning conditions, the fluidity of the core component difference, not normal spinning; when IV -IV _sheath when _{the core} is too small, i.e. viscosity IV _{of the core} component polymer constituting the core is far lower than the _sheath polymer viscosity IV constituting sheath component, spinning stress during spinning toward the sheath component concentration, impact The orientation of the core component polymer deteriorates the physical properties of the obtained fiber. In order to obtain fibers with physical properties substantially equivalent to ordinary fibers, the present invention is preferably an IV _core- IV _sheath = -0.3dl / g ~ 0.5dl / g, more preferably an IV _core- IV _sheath = -0.2dl / g ~ 0.3dl / g.

In the core-sheath composite fiber of the present invention, the exposed sheath component is covered with a core component containing a high concentration of inorganic particles A, and the inorganic particles A and the grease nipple, the yarn guides of the spinning machine, and the rollers are avoided during spinning. Such as direct contact, reducing frictional resistance, ensuring good thread passing of the yarn, and avoiding the inorganic particles A from falling off due to direct contact with the various components of the spinning machine, contaminating the grease nipple, the yarn guide and the roller, reducing the core-sheath composite fibers The effect of anti-permeability, anti-ultraviolet, and heat-shielding performance can also reduce the wire breakage rate in the post-processing step.

The core-sheath composite fiber of the present invention can be used to prepare a highly transparent, ultraviolet-resistant, and heat-shielding fabric. The core-sheath composite fiber of the present invention may be used partially or entirely in the fabric. When the core-sheath composite fiber of the present invention is partially used, other fibers may be general polyester fibers, polyamide fibers, polyolefin fibers, polyurethane fibers, and the like. The total content of the inorganic particles A and B in the fabric is preferably 4.0 to 25.0 wt%, and the above-mentioned inorganic particles A and B are preferably titanium dioxide. Among them, the inorganic particles A are preferably rutile-type titanium dioxide.

The fabric made of the core-sheath composite polyester fiber of the present invention has the effects of high permeability resistance, ultraviolet resistance, and heat shielding.

The test methods of the relevant parameters in the present invention are as follows:

    (1) Light transmittance (permeability)    

Use a hue meter to test the L value of the whiteboard and blackboard respectively: L (white), L (black). Take a fabric sample (10 × 10cm), and test the L value against the white board and blackboard respectively: L (white + cloth), L (black + cloth), light transmittance: (1- (L (white + cloth)- L (black + cloth)) / (L (white) -L (black)) × 100%.

    (2) UVA, UPF (ultraviolet resistance)    

UV resistance parameters UVA and UPF are evaluated according to standard GB / T 6529.

    (3) Content of inorganic particles in fabric    

Take about 4g of this fiber fabric, melt the sample, measure the content of metal elements in it by X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX Primus Ⅲ +), and then calculate the content of inorganic particles in the core component by molecular formula .

    (4) Content of inorganic particles in core and sheath components    

The composite ratio of the fibers was determined from the cross-section photograph, and then the alkali solution was used for the dissolution treatment to confirm whether the sheath component was completely dissolved according to the reduction rate. After the sheath component was completely dissolved, an X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX Primus Ⅲ +) Determine the content of metal elements in the core component, and then calculate the inorganic particle content in the core component by the molecular formula; subtract the inorganic particle content in the core component from the total inorganic particle content in the measured fabric to obtain the sheath component The content of inorganic particles.

    (5) Section ratio of core component to sheath component in the fiber    

By SEM photograph the composite fiber cross-section, the cross-sectional photograph printed on paper, the core component is obtained by planimeter sectional area S _1, S ₂ sectional area of the sheath component, the core component ratio = S ₁ / (S ₁ + S ₂ ).

    (6) Average particle size of inorganic particles    

Photographs of fiber cross-sections were taken by SEM. After printing, 10 particles were selected from the core composition, and the diameters of the particles passing through the center of the particles were measured. The final result is the average of 10 sets of data.

    (7) Strength product of fiber    

According to the standard GB / T14344-2008, the strength and elongation of the fiber are tested separately. The strength elongation product of the fiber is calculated using the following formula: strength elongation product = strength × (elongation) ^1/2 , the value of the fiber's strength elongation product When it is greater than 18, it is judged as ◎, when the value of the fiber elongation product is 15-18, it is judged as ○, and when the value of the fiber elongation product is 13-15 (excluding 15), it is judged as △.

    (8) Polymer viscosity (IV)    

Weigh 0.8g of polymer and dissolve it with 10g of o-chlorophenol, maintaining the solution at 25 ° C, using an automatic viscometer to test the time t of the solution flowing down, and calculate it according to the following formula: IV = t × β × F _{ch1 ~ 3} + γ

F = (1Vs-γ) / (Ts × β)

F: CH coefficient (0.001 ~ 1.000)

Ts: number of seconds of standard sample flow

IVs: inherent viscosity of standard samples

β: 0.001 ~ 1.000 (variable)

γ: 0.001 to 1.000 (variable).

    (9) Lightfastness    

The test was performed according to the standard JIS L0842 for a test of light fastness for 20 hours. The samples after the irradiation treatment were compared with the non-irradiated control samples, and judged according to the standard contrast gray card to determine the light fastness level. ○ is a level of light fastness of 4 or more, and △ is a level of 3.

    (10) Rutile titanium dioxide    

The obtained fiber was made into a thin film by melting, and the crystal peak position was tested using an X-ray diffraction device. At the same time, the crystal peak position of general rutile titanium dioxide was tested. The crystal peak position of the titanium dioxide was judged by comparing the crystal peak positions obtained by the two.

    [Example]    

Hereinafter, the present invention will be described in detail based on examples.

    [Example 1]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 5.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matting polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 90.0%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 2]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 10.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 92.6%, and it had ultraviolet resistance and qualified light fastness.

    [Example 3]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The obtained tube knitted fabric had an anti-permeability of 93.8%, had anti-ultraviolet performance, and qualified light fastness.

    [Example 4]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 20.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 94.6%, it had ultraviolet resistance, and the light fastness was qualified.

    [Example 5]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 25.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 95.6%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 6]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 30.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 95.9%, it had ultraviolet resistance, and the light fastness was qualified.

    [Example 7]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle size of 0.30 micrometers and 20 parts by weight of 2.5% by weight of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 94.5%, and it had ultraviolet resistance and qualified light fastness.

    [Example 8]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 1.00 micrometers and 20 parts by weight of 2.5% by weight of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 93.6%, and it had ultraviolet resistance and qualified light fastness.

    [Example 9]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 1.45 microns and 20 parts by weight of 2.5% by weight of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 93.3%, and it had ultraviolet resistance and qualified light fastness.

    [Example 10]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of non-inorganic particles The polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and respectively put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.0%, it had ultraviolet resistance, and the light fastness was qualified.

    [Example 11]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 0.3% by weight containing TiO ₂ particles The semi-matte polyester (sheath component) was pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B silos for spinning and false twisting to obtain long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the obtained tube knitted fabric had an anti-permeability of 93.2%, had anti-ultraviolet performance, and qualified light fastness.

    [Example 12]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of anatase-type TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% TiO ₂ particles The fully matt polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.1%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 13]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 5.0 wt% of anatase-type TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The obtained tube knitted fabric had an anti-permeability of 90.2%, had anti-ultraviolet performance, and qualified light fastness.

    [Example 14]    

50 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 50 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 90.1%, and it had ultraviolet resistance and qualified light fastness.

    [Example 15]    

70 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 30 parts by weight of 2.5% by weight of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 92.3%, and it had ultraviolet resistance and qualified light fastness.

    [Example 16]    

95 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 5 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 96.2%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 17]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of BaSO ₄ particles having an average particle diameter of 0.60 microns and 20 parts by weight of polyester (sheath component) containing no inorganic particles Pre-crystallizing, drying to 50 ppm or less, and putting them into the spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.0%, it had ultraviolet resistance, and the light fastness was qualified.

    [Example 18]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 7.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 0.3 wt% of TiO ₂ particles The semi-matte polyester (sheath component) was pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B silos for spinning and false twisting to obtain long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the permeability resistance of the obtained tube knitted fabric was 91.5%, and it had ultraviolet resistance and qualified light fastness.

    [Example 19]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing a mixture of 15.0 wt% rutile TiO ₂ particles and BaSO ₄ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight containing 2.5 The wt% TiO ₂ full-matting polyester (sheath component) is pre-crystallized and dried to less than 50 ppm, and then put into the spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The obtained tube knitted fabric had an anti-permeability of 92.9%, had anti-ultraviolet performance, and qualified light fastness.

    [Example 20]    

80 parts by weight of polycaprolactam (N6) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of polycaprolactone containing 2.5% by weight of TiO ₂ particles The amidine (N6) (sheath component) is respectively pre-crystallized and dried, and is respectively put into the spinning A and B silos for spinning to obtain long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.5%, and it had ultraviolet resistance and qualified light fastness.

    [Example 21]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The knitted fabric was interwoven with a common polyester fiber at a ratio of 30:70 to obtain a knitted fabric. The obtained knitted fabric had an anti-permeability of 85.1% and had anti-ultraviolet performance. Although the content of inorganic particles in the final fabric is only 3.8 wt%, due to the high tissue density of the finished product, its light transmittance and UV resistance meet the requirements, and its light fastness is acceptable.

    [Example 22]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of CaCO ₃ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of polyester (sheath component) containing no inorganic particles Pre-crystallizing, drying to 50 ppm or less, and putting them into the spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 91.0%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 23]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of ZnO having an average particle diameter of 0.60 micrometers and 20 parts by weight of polyester (sheath component) containing no inorganic particles were separately performed. It is pre-crystallized and dried to 50 ppm or less, and then put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 91.3%, it had ultraviolet resistance, and its light fastness was acceptable.

    [Example 24]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. Among them, the viscosity of the core component and the sheath component is poor. The IV _core- IV _sheath is -0.3 dl / g. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 93.3%, and it had ultraviolet resistance and qualified light fastness.

    [Example 25]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. Among them, the viscosity of the core component and the sheath component is poor. The IV _core- IV _sheath is -0.2 dl / g. The obtained fiber was made into a tube knitted fabric, and the obtained tube knitted fabric had an anti-permeability of 93.2%, had anti-ultraviolet performance, and qualified light fastness.

    [Example 26]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. Among them, the viscosity of the core component and the sheath component is poor. The IV _core- IV _sheath is 0.3 dl / g. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.7%, and it had ultraviolet resistance and qualified light fastness.

    [Example 27]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. Among them, the viscosity of the core component and the sheath component is poor. The IV _core- IV _sheath is 0.5 dl / g. The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.5%, and it had ultraviolet resistance and qualified light fastness.

    [Example 28]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 0.1% by weight TiO ₂ particles The cationic dye-dyeable polyester (sheath component) is pre-crystallized, dried to less than 50 ppm, and put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. The obtained fiber was made into a tube knitted fabric, and the obtained tube knitted fabric had an anti-permeability of 93.1% and an anti-ultraviolet property.

    [Example 29]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 1.00 μm and 20 parts by weight of an easily dissolvable type containing no inorganic particles The polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and respectively put into spinning A and B silos for spinning and false twisting to produce long fibers with high barrier properties. After the obtained fiber was made into a tube knit, the weight was reduced in a NaOH solution having a concentration of 2%, a bath ratio of 50, and a temperature of 98 ° C for 25 minutes. The reduction rate of the tube knit was 20.4%. It is 95.8% and has UV resistance.

Observation of the reduced knitwear by SEM showed that there were obvious irregular particles on the fiber surface, and the particles were TiO ₂ particles. At the same time, irregular pores on the surface of the fiber were also seen, which were caused by the shedding of some TiO ₂ particles during the reduction of these pores.

    [Example 30]    

80 parts by weight of polypropylene (PP) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of polypropylene (PP) containing 2.5% by weight TiO ₂ particles It is put into the spinning A and B silos for spinning and false twisting to produce long fibers with high permeability resistance. Among them, the viscosity of the core component and the sheath component is poor. The IV _core- IV _sheath is 0 dl / g. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 93.3%, and it had ultraviolet resistance and qualified light fastness.

    [Comparative Example 1]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 2.5% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matting polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and respectively put into spinning A and B silos for spinning and false twisting to obtain long fibers. The difference in viscosity IV between the core component and the sheath component is 0. The obtained fiber was made into a tube knitted fabric, and the permeability of the obtained tube knitted fabric was 70.1%. Because the content of the inorganic particles A in the core component is less than 5 wt%, the obtained fibers and fabrics have poor barrier properties, do not have ultraviolet resistance, and have light fastness.

    [Comparative Example 2]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 35.0 wt% of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 2.5 wt% of TiO ₂ particles The full-matting polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and respectively put into spinning A and B silos for spinning and false twisting to obtain long fibers. The difference in viscosity IV between the core component and the sheath component is 0. Because the content of the inorganic particles A in the core component is higher than 30% by weight, the interruption of the yarn and the spinning of the spinning step occur many times, and the physical properties of the obtained fiber are poor. The interruption of the yarn occurs many times during the weaving process, which is not practical for production.

    [Comparative Example 3]    

45 parts by weight of polyethylene terephthalate (PET) (core component) containing 30.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 55 parts by weight of 2.5% by weight containing TiO ₂ particles The full-matting polyester (sheath component) was pre-crystallized, dried to 50 ppm or less, and respectively put into spinning A and B silos for spinning and false twisting to obtain long fibers. The difference in viscosity IV between the core component and the sheath component is 0. Because the proportion of the sheath component with a small amount of inorganic particles is too high, the permeability of the tube knitted fabric obtained after the obtained fiber is made into a tube knitted fabric is 73.1%, it does not have ultraviolet resistance, and the light fastness is qualified.

    [Comparative Example 4]    

Polyethylene terephthalate (PET) containing rutile TiO ₂ particles with an average particle size of 0.60 micrometers was pre-crystallized and dried to 50 ppm or less, and then put into a spinning silo for spinning and false twisting. Long fibers. Due to the lack of a sheath component to cover the high-content core component of the inorganic particles, the interruption of the yarn during the spinning step and the flying yarn occur many times, and the physical properties of the resulting fiber are poor. The interruption of the yarn occurs many times during the weaving process, which is not practical for production. In addition, the inorganic particles on the fiber surface are likely to damage the equipment due to friction with the yarn guide and the like during spinning.

    [Comparative Example 5]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15 wt% of rutile-type TiO ₂ particles having an average particle size of 2.00 μm and 20 parts by weight of 2.5 wt% of TiO ₂ particles The matting polyester (sheath component) is pre-crystallized, dried to 50 ppm or less, and then put into spinning A and B silos for spinning and false twisting to obtain long fibers. The difference in viscosity IV between the core component and the sheath component is 0. Because the average particle diameter of the inorganic particles B in the core component is too large, the spinning component is easily blocked by the inorganic particles during the spinning process, which affects the spinnability.

    [Comparative Example 6]    

80 parts by weight of polyethylene terephthalate (PET) (core component) containing 15.0% by weight of rutile TiO ₂ particles having an average particle diameter of 0.60 micrometers and 20 parts by weight of 4.0% by weight of TiO ₂ particles The full-matt polyester (sheath component) is pre-crystallized and dried to 50 ppm or less, and then put into the spinning A and B bins for spinning and false twisting to produce long fibers with high barrier properties. The difference between the viscosity of the core component and the sheath component is IV _core- IV _sheath . The obtained fiber was made into a tube knitted fabric. The permeability of the obtained tube knitted fabric was 93.7%, and it had ultraviolet resistance and qualified light fastness. However, because there are too many TiO ₂ particle components in the sheath component, the spinning step is interrupted and the flying yarn occurs more often, and the physical properties of the obtained fiber are poor. The yarn is interrupted more during the weaving process and the production practicality is poor. In addition, there are many inorganic particles on the surface of the fiber, and friction with a yarn guide or the like during spinning causes damage to the equipment.

Claims (14)

    A high-permeability-resistant core-sheath composite fiber, characterized in that a ratio of a core component to a sheath component in a cross-section of the core-sheath composite fiber is 50 to 95: 50 to 5; the core component contains 5.0 to 30.0 of the core component; wt% of inorganic particles A; the sheath component contains inorganic particles B of 3.0 wt% or less of the sheath component.     The high-permeability-resistant core-sheath composite fiber according to claim 1, wherein the average particle diameter of the inorganic particles A in the core component is 1.50 μm or less.     According to claim 1 or 2, the high-permeability-resistant core-sheath composite fiber, wherein the inorganic particles A and B are one or more of titanium dioxide, calcium carbonate, barium sulfate, and zinc oxide, respectively.         The high-permeability-resistant core-sheath composite fiber according to claim 1 or 2, wherein the inorganic particles A and B are titanium dioxide.         The high-permeability-resistant core-sheath composite fiber according to claim 4, wherein the inorganic particles A are rutile-type titanium dioxide.     The high anti-permeability core-sheath composite fibers of the requested item 1 or 2, wherein the relationship between viscosity IV _{of the core} component constituting the core polymer viscosity IV of the polymer constituting the _sheath component of the sheath as shown in the formula, _{the core} 1 IV -IV _sheath = -0.3dl / g ~ 0.5dl / g (Equation 1). The high anti-permeability of the core-sheath composite fiber requested item 6, wherein the relationship between viscosity IV _{of the core} component constituting the core polymer viscosity IV of the polymer constituting the _sheath component of the sheath as shown in formula, IV -IV 2 _{core Sheath} = -0.2dl / g ~ 0.3dl / g (Equation 2).     For example, the high permeability-proof core-sheath composite fiber according to claim 1 or 2, wherein the core component contains 7.0 to 25.0 wt% of the inorganic particles A of the core component.         For example, the high permeability-proof core-sheath composite fiber according to claim 1 or 2, wherein the sheath component contains inorganic particles B that account for 1.0 to 3.0 wt% of the sheath component.     For example, the high permeability-proof core-sheath composite fiber according to claim 1 or 2, wherein the average particle diameter of the inorganic particles A in the core component is 1.00 μm or less.     The high-permeability-resistant sheath-sheath composite fiber according to claim 1 or 2, wherein the sheath component is an easily-dissolvable polyester or a cationic dyeable polyester.         A fabric obtained from the high-permeability-resistant core-sheath composite fiber of claim 1.         For example, the fabric of claim 12, wherein the total of the inorganic particles A and inorganic particles B in the above-mentioned fabric accounts for 4.0 to 25.0 wt% of the fabric.         The fabric of claim 12 or 13, wherein the inorganic particles A and B are both titanium dioxide, and the inorganic particles A are rutile-type titanium dioxide.