TW202206658A - Multi-layer section composite fiber and fabric thereof having excellent anti-permeability, anti-ultraviolet, heat shielding performance and excellent resistance to water infiltration and discoloration - Google Patents

Abstract

The present invention discloses a multi-layer section composite fiber. A cross section of the fiber has a multi-layer section structure of 3-15 layers formed by alternately arranging at least two components. The outermost layer of the multi-layer section structure is formed of polymer B having an inorganic particle content of 5.0 wt% or less. At least one layer of the composite fiber is formed of polymer A having an inorganic particle content of 10.0-70.0 wt%, and the polymer A accounts for 10-70 wt% of the composite fiber. The obtained fiber and fabric have good spinning and weaving processing performance, and have excellent anti-permeability, anti-ultraviolet, heat shielding performance and excellent resistance to water infiltration and discoloration.

Description

Multilayer section composite fiber and its fabric

The present invention relates to a multi-layer cross-section composite fiber, in particular to a multi-layer cross-section composite fiber formed by alternately arranging at least two polymers with different inorganic particle contents, and a fabric obtained from the fiber.

In the field of wear, visual occlusion is an important performance of textiles, which is related to the most basic function of shading; in the field of decoration and military, it involves special visual requirements such as one-way perspective and camouflage. In addition, with the extensive use of fluorochlorofluorocarbons worldwide 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 lifespan of organic molecules and reduce the immune function of the human body, which not only damages the skin and causes dermatitis, erythema, freckles and skin cancer, but also promotes eye diseases and causes cataract disease. In addition, especially in hot summer, clothing with certain heat shielding properties has become the pursuit of consumers.

In addition, in the field of wearing, the color fading of clothing is also an important property of textiles. After the human body sweats a lot or is wet by rain, the clothes will be close to the skin, and the place soaked by sweat or rain will be lighter than the dry place. Darkens, affects aesthetics. Furthermore, in the process of exercising, competitive opponents can often judge the fatigue level of the opponent's players by the amount of sweat of the opponent's players, so as to reasonably use competitive means to win the game. Therefore, when the clothing is soaked, it will not fade and become an emerging pursuit of summer consumers.

Chinese patent CN103628180A discloses a super-extinction memory fiber and a preparation method. The fiber adopts a skin-core composite structure, which cannot overcome the phenomenon of wire breakage in the weaving process of conventional fully matte fibers. A large amount of titanium dioxide particles are added in the core to achieve the anti-penetration effect, and the amount of titanium dioxide in the sheath is lower than that of the core. Improve weaving passability. However, the amount of titanium dioxide added in the composite fiber core is greater than or equal to 3%. If a large amount is added, although excellent anti-penetration and anti-ultraviolet effects can be obtained, it will lead to a decrease in spinnability, a decrease in the strength of the raw yarn, and the interruption of the yarn during the weaving process. Obviously, adding a large amount of titanium dioxide will also lead to an increase in cost. On the contrary, if the amount of titanium dioxide added is low, although it has the performance of conventional full extinction, it does not have excellent anti-penetration and anti-ultraviolet effects.

Japanese Patent Laid-Open No. 11-269721, Japanese Patent Laid-Open No. 2008-223171, and Japanese Patent Laid-Open No. 2013-44055 also disclose a skin-core composite fiber, by adding titanium dioxide particles to the core component to achieve anti-penetration and anti-ultraviolet effects. Likewise, titanium dioxide is added in large quantities in the composite fiber core. Although excellent anti-penetration and anti-ultraviolet effects are obtained, it will lead to a decrease in spinnability, a decrease in the strength of the raw yarn, and obvious interruption of the yarn during the weaving process, and a large amount of titanium dioxide will also lead to an increase in cost. On the contrary, if the amount of titanium dioxide added is low, Although it has the performance of conventional full extinction, it does not have excellent anti-penetration and anti-ultraviolet effect.

Japanese Patent Laid-Open No. 11-181627 discloses a multi-layer laminated fiber, a polyester composite staple fiber with excellent spinnability, opacity and heat shielding properties, composed of two types of polyesters with different white pigment contents, among which the polyester with more white pigments The content of the medium white pigment is 1.5wt% to 10.0wt%, and the content of the white pigment in the polyester with less white pigment is less than 0.5wt%. In the embodiments with multiple layers on the fiber cross section such as core sheath or concentric circles disclosed in the patent, polyester with more white pigment is used as the innermost layer, and polyester with less white pigment is used as the outer layer, which can avoid spinning Sexual deterioration. Compared with the general fully matte polyester, the anti-penetration performance of the fibers obtained in this embodiment is improved, but still cannot achieve a higher anti-penetration effect.

The object of the present invention is to provide a multi-layer cross-section composite fiber and a fabric formed by the composite fiber with high anti-penetration, anti-ultraviolet, good heat shielding performance, and prevention of discoloration and fading at the same time.

The technical solution of the present invention is: A multi-layer cross-sectional composite fiber, which has a multi-layer cross-sectional structure of 3 to 15 layers formed by alternately arranging at least two components, and the outermost layer of the multi-layer cross-sectional structure is composed of inorganic particles with a content of less than 5.0wt%. The polymer B is formed, and at least one layer of the composite fiber is formed of polymer A with an inorganic particle content of 10.0-70.0 wt %, and the polymer A accounts for 10-70 wt % of the composite fiber.

The content of the inorganic particles derived from the polymer A in the above-mentioned composite fibers is preferably 7.0-30.0 wt %, more preferably 8.0-20.0 wt %, and most preferably 12.0-15.0 wt %.

The content of inorganic particles in the above-mentioned polymer A is preferably 15-60 wt %.

The cross section of the above-mentioned fiber preferably has a cross-sectional structure of 3 to 9 layers formed by alternately arranging polymer A and polymer B, more preferably having 3 layers formed by alternately arranging polymer A and polymer B ~5-story cross-sectional structure.

The area of the outermost layer of the above-mentioned multi-layer cross-sectional structure preferably accounts for 5-30% of the overall area of the cross-section.

The polymer constituting the above-mentioned conjugate fiber is preferably polyester, nylon, polypropylene or polyurethane.

The absolute value of the difference in the reflectivity of visible light with a wavelength of 550 nm in the dry and wet state of the composite fiber is preferably less than 5.0%, more preferably less than 3.0%.

The strength-elongation product of the above-mentioned conjugate fiber is preferably 15.0 or more, more preferably 19.0 or more.

The present invention also discloses a fabric prepared from the above-mentioned multi-layer cross-sectional structural fibers. Preferably, the absolute value of the difference in visible light reflectance with a wavelength of 550 nm is less than 5.0%, and more preferably less than 3.0%, in the dry and wet state of the above-mentioned fabric.

In the present invention, the polymer A with high content of inorganic particles and the polymer B with low content of inorganic particles are alternately arranged in the fiber in the form of multi-layer section, so that the composite fiber has good effects of high anti-penetration, anti-ultraviolet and heat shielding performance. At the same time, good strength and elongation properties are maintained, and the composite fibers and the fabrics formed therefrom can effectively prevent discoloration and fading.

The cross-section of the multi-layered cross-sectional composite fiber of the present invention has a multi-layer cross-sectional structure of 3 to 15 layers formed by alternately arranging at least two components, and the outermost layer of the multi-layer cross-sectional structure has an inorganic particle content of 5.0 wt %. The following polymer B is formed, and at least one layer of the conjugate fiber is formed of the polymer A having an inorganic particle content of 10.0 to 70.0 wt %.

In the present invention, the polymer A with high content of inorganic particles is placed in the inner layer of the multi-layer cross-section composite fiber, so that the fiber can have good passability during processing, and problems such as broken filaments will not occur in the later weaving process.

Although the higher the content of inorganic particles, the better the anti-permeability of the fiber, but adding a large amount of inorganic particles will significantly reduce the strength and elongation of the fiber. In order to maintain the properties of fiber such as strength and elongation, it is necessary to reduce the amount of polymer A with high content of inorganic particles. It is superior to the anti-penetration effect of the core-sheath fiber with the same content of inorganic particles.

On the other hand, in order to meet some specific strength and elongation, the fiber can be distributed in the fiber by polymer A in the form of multiple layers, although the composition of the polymer A in the cross section of the fiber close to the outer layer is reduced, resulting in the appearance of anti-permeability. It is slightly lower, but the multi-layer structure disperses the polymer A in the fiber more uniformly, which can improve the strength and elongation of the raw fiber and meet the specific application conditions.

When the content of inorganic particles in the above-mentioned polymer A is less than 10.0 wt%, although the spinning performance of polymer A and the physical properties of the composite fibers are not problematic, a small amount of inorganic particles is not conducive to the reflection and absorption of light, and the anti-penetration of the composite fibers. The resistance, UV resistance, and heat shielding performance will be greatly reduced and will not reach the required level. The higher the content of inorganic particles A in polymer A, the better the anti-permeability, UV resistance, heat shielding performance, and discoloration after being wetted by water of the composite fiber. However, when the content of inorganic particles in the polymer A is higher than 70.0wt%, the spinning performance of the polymer A is affected, and the phenomenon of filament breakage and spinning easily occurs during the spinning process, and the obtained composite fiber has poor strength and elongation. affect its subsequent use. Therefore, considering comprehensively the anti-permeability, UV resistance, heat shielding performance and production feasibility of the composite fiber, the content of inorganic particles in the above-mentioned polymer A is preferably below 15.0-50.0 wt%.

The above-mentioned polymer A accounts for 10 to 70 wt % of the entire composite fiber. If the content of polymer A in the composite fiber is less than 10wt%, the normal composite multi-layer cross-sectional structure cannot be guaranteed, and the content of inorganic particles in the composite fiber is too small, and the fiber has anti-penetration, anti-ultraviolet, heat shielding properties, and is wetted by water. The subsequent discoloration and fading are not ideal. Although the higher the content of polymer A, the better the anti-permeability of the composite fiber, but the price of the polymer component with a large content of inorganic particles is higher, which leads to an increase in the price of the fiber as a whole. The basic physical properties of the fiber will decrease. The preferred content of the polymer A in the composite fiber of the present invention is 15-60 wt%.

The present invention does not specifically stipulate the form of the multi-layer cross-sectional structure, which may be arranged in concentric circles, parallel arrangements, or perpendicularly intersecting arrangements between layers. When the multi-layer cross-sectional structure is arranged in concentric circles, the innermost central layer may be a polymer layer or a hollow layer.

As long as the layers formed by polymer A and the layers formed by polymer B are arranged alternately and at intervals, the alternate arrangement can ensure that when the content of polymer A in the fiber is low, no matter what kind of multi-layer cross-sectional structure the cross-section of the composite fiber presents, All can make the composite fiber achieve excellent anti-penetration, anti-ultraviolet, heat shielding performance, and discoloration and fading performance after being soaked in water. At the same time, the alternating arrangement can also ensure the thickness of the outermost layer.

The content of inorganic particles derived from polymer A in the multi-layer cross-section composite fibers of the present invention is 7.0-30.0 wt%, the content of inorganic particles derived from polymer A in the composite fibers is relatively small, and the fibers have anti-penetration, anti-ultraviolet, and heat shielding properties. , The discoloration after being soaked in water is not ideal. Although the higher the content of inorganic particles from polymer A in the composite fiber, the better the performance of the composite fiber, but when the content of inorganic particles from polymer A increases to a certain value, the performance of the overall fiber will be less and less, and due to The price of a polymer component with a high content of inorganic particles is higher, which leads to an increase in the price of the entire fiber, and when the content of inorganic particles is high, the basic physical properties of the fiber will decrease. Therefore, the content of the inorganic particles derived from the polymer A in the above-mentioned fibers of the present invention is preferably 8.0-20.0%, and most preferably 12.0-15.0%.

The above-mentioned conjugate fiber of the present invention has a cross-sectional structure of 3 to 15 layers. When the number of layers of the above-mentioned multi-layer cross-sectional structure is too many, more than 15 layers, the forming of the cross-sectional structure will be abnormal, and the basic physical properties of the fibers will be poor. In order to take into account the basic physical properties of the fiber, the anti-penetration performance and the heat shielding performance, the preferred number of layers of the above-mentioned multi-layer cross-sectional structure in the present invention is 3 to 9 layers, and the optimal number is 3 to 5 layers.

When the content of inorganic particles in the polymer contacting the spinning equipment is high, it will cause friction between the inorganic particles and the yarn guide, etc., which will affect the life of the equipment and the spinnability of the polymer. In order to make the spinnability of the polymer better during spinning, and to avoid the influence of inorganic particles on the spinning equipment, it is preferred in the present invention to expose the surface of the fiber to be the polymer B with less inorganic particles, that is, the multi-layer section above. The outermost layer of the structure is formed from the polymer B described above. The polymer B with less inorganic particles covers the polymer A with more inorganic particles, avoiding direct contact of a large number of inorganic particles with the oil feeder, each yarn guide of the spinning machine, rollers, etc. during spinning. , reduce the frictional resistance, ensure the good engineering passability of the thread, and avoid the high content of inorganic particles directly contacting the various parts of the spinning machine to cause falling off, polluting the oil feeder, yarn guide and roller, and reduce the multi-layer cross-section composite fiber. The influence of anti-penetration, anti-ultraviolet, and heat shielding properties can also reduce the wire breakage rate in the post-processing process.

In addition, in order not to unduly affect the anti-penetration, anti-ultraviolet, and heat-shielding properties of the conjugate fiber, the area of the outermost layer formed of the polymer B preferably accounts for 5 to 30% of the entire cross-sectional area. When the area ratio of the outermost layer formed of the polymer B is too large, the influence on the barrier property of the entire composite fiber is large, and the barrier property of the composite fiber is deteriorated. Although the smaller the area of the outermost layer formed by the polymer B, the better the anti-permeability of the composite fiber, but when the area ratio is small to a certain extent, the increase in the anti-permeability of the composite fiber is relatively small. And the surface abrasion caused by friction will easily occur during the processing and use of the wire. Therefore, in the present invention, it is more preferable that the area of the outermost layer formed by the polymer B accounts for 10 to 20% of the overall area of the cross section.

The inorganic particles of the present invention can be titanium dioxide, calcium carbonate, barium sulfate, zinc oxide, silicon dioxide or boron nitride, etc., among which titanium dioxide, calcium carbonate, barium sulfate or zinc oxide are preferred. The inorganic particles contained in the polymer A and the polymer B may be the same or different. In order to obtain a composite fiber with higher barrier properties and UV resistance, the above-mentioned inorganic particles of the present invention are preferably titanium dioxide.

The refractive index of the above-mentioned inorganic particles is preferably 1.6 to 3.0, more preferably 2.0 to 3.0.

The above-mentioned titanium dioxide is classified into anatase-type titanium dioxide and rutile-type titanium dioxide according to different crystal forms. The crystal structure of the commonly used anatase titanium dioxide is unstable, and it is easy to generate free radicals. When the free radicals accumulate to a certain amount, the light fastness of the polymer is affected. Therefore, when a large amount of anatase titanium dioxide is contained in the fiber, the light resistance of the fiber will be deteriorated. In order to obtain more excellent light fastness to the fibers, the inorganic particles contained in the polymer A of the present invention are preferably rutile-type titanium dioxide.

In the present invention, the polymer components constituting the polymer A are not particularly limited, and include various thermoplastic polymers. It may be a polyester-based polymer or a polyamide-based polymer, a polyolefin-based polymer, or a polyurethane. Specifically, the polyester-based polymer may be a homopolymer such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, or a copolymer thereof. The above-mentioned polyamide polymers can be polyamide 6, cationic dyeable polyamide 6, polyamide 66, etc.; the above-mentioned polyolefin polymers can be polyethylene, polypropylene, polybutadiene, etc. .

In the present invention, the polymer components constituting the polymer B are not particularly limited, and include various thermoplastic polymers. Depending on the polymer raw material, it may be a polyester-based polymer or a polyamide-based polymer, a polyolefin-based polymer, or a polyurethane. Specifically, the above polyester polymers can be homopolymers such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, etc., or their copolymers. ; According to different functions, the above polyester polymers can be disperse dye dyeable polyester, cationic dye dyeable polyester, easily dissolvable polyester, conductive polyester, antistatic polyester, hygroscopic polyester, low friction polyester esters, etc.; the above-mentioned polyamide polymers can be polyamide 6, cationic dye-dyeable polyamide 6, polyamide 66, etc.; the above-mentioned polyolefin polymers can be polyethylene, polypropylene, polybutadiene Wait. Depending on the content of inorganic particles in polymer B, the sheath component can be bright polymer, semi-dull polymer, full-dull polymer, such as bright polyester, semi-dull polyester, full-dull polyester and the like.

As the polymer B of the outermost layer of the fiber, when various functions are imparted to it, the spinnability will be deteriorated, and the lasting stability of the corresponding functions in subsequent use is not good, you can choose to add functional polymer components in the outermost layer. As a separate layer, polymer A and polymer B are alternately arranged, and polymer B is selected to contain only 5.0 wt % or less of inorganic particles. The above-mentioned functional polymer may be a hygroscopic polymer for improving the moisture absorption rate of the entire fiber, an antibacterial polymer for improving the antibacterial property of the entire fiber, a flame retardant polymer, or the like.

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

When the fibers are wetted with liquid (wet state), due to the presence of the liquid layer, the refraction and reflection effects are changed compared to the fibers in the usual dry state. If the change is too large, the color of the fiber in the wet state and the dry state will be too different, especially when it is used to prepare summer clothes, the color of the place impregnated by sweat is quite different from the color of other places not impregnated by sweat, which affects the beautiful. In the present invention, the degree of change in the refraction and reflection effect of the fiber in the wet state and the dry state is related to the number of layers in the fiber section, the content of inorganic particles in the polymer A and the polymer B, and the amount of the polymer A and the polymer B in the composite fiber. content has a certain relationship. The above degree of change is characterized by the absolute value of the difference in the visible light reflectance of the composite fiber at a wavelength of 550 nm in wet and dry conditions. In the dry and wet state of the composite fiber of the present invention, the absolute value of the difference in visible light reflectivity at a wavelength of 550 nm is preferably less than 5.0%.

The above-mentioned multi-layer cross-section composite fiber of the present invention has a product of strand strength and elongation of 15.0 or more. In the process of fiber use, the strength and elongation product of the raw silk needs to meet a certain level, so as to ensure good passability during spinning, weaving, and product use, and can maintain good tear resistance. When the strength and elongation product of the raw yarn is below 15.0, the yarn will be broken during the weaving process, and the passability will be poor, and the finished product will not have good breaking strength, which will affect the service life.

The conjugated fibers of the present invention can be used to prepare fabrics, and the multi-layer cross-section conjugated fibers of the present invention can be partially or completely used in the fabrics. The above-mentioned fabrics include woven fabrics, knitted fabrics, third fabrics, non-woven fabrics, multidirectional fabrics, three-dimensional fabrics, composite fabrics, and the like. When the composite fibers of the present invention are partially used to prepare the fabric, other fibers may be ordinary polyester fibers, polyamide fibers, polyolefin fibers, polyurethane fibers, and the like. On the premise that the difference in visible light reflectivity of 550 nm wavelength in the dry and wet state of the fabric is less than 5.0%, it can be widely used as a summer wear fabric.

The test method of each parameter involved in the present invention is as follows:

(1) Anti-penetration performance Using D65 light source to illuminate the whiteboard and blackboard of the reference color respectively, the L values were measured as L (white) and L (black). Then take the fabric sample cloth (10 × 10cm), cover it on the whiteboard and blackboard of the reference color, and then irradiate the sample cloth with D65 light source, and measure its L value as L (white + cloth), L (black + cloth) , and then use the following formula to calculate the data of light barrier properties. The greater the data of the obtained light barrier properties, the better the barrier properties of the sample fabric. 10 samples were taken for testing, and the final results were averaged. Light barrier: (1-(L(white+cloth)-L(black+cloth))/(L(white)-L(black))×100%.

(2) UPF (UV resistance) The UV resistance parameter UPF is evaluated according to the standard GB/T 6529. 10 samples were taken for testing, and the final results were averaged. A UPF value of 50 or more was judged as 0, a UPF value of 40 or more and less than 50 was judged as Δ, and a UPF value of less than 40 was judged as ×.

(3) The type and content of inorganic particles in the fabric Take about 4g of the fiber fabric, melt the sample, measure the content of metal elements by X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX PrimusⅢ+), and then measure the weight of inorganic particles in the fiber by burning ash method , Calculate the type and content of inorganic particles in the fabric from the content of metal elements and the weight of inorganic particles. 10 samples were taken for testing, and the final results were averaged.

(4) The cross-section ratio of each component in the fiber and the area ratio of the outermost layer The cross-section of the composite fiber was photographed by SEM, the cross-sectional photo was printed on paper, and the polymer B with less inorganic particle content was obtained by an area meter. The cross-sectional area S ₁ of the component, the cross-sectional area S ₂ of the polymer A component with a large amount of inorganic particles, the proportion of the component B of the polymer = S ₁ /(S ₁ +S ₂ ), the proportion of the component A of the polymer = S ₂ /(S ₁ + S ₂ ). For the section of the composite fiber photographed by SEM, the outermost layer area and the overall section area are tested, and the outermost section area ratio=outermost layer area/overall fiber area. 10 samples were taken for testing, and the final results were averaged.

，

。(5) Content of Inorganic Particles in Each Component Take a certain weight (N1) of fiber samples, and measure the weight of metal elements in it by X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX Primus III+) (calculate the weight of inorganic particles) M1). Determine the composite ratio of polymer A and polymer B in the fiber and the area ratio of the outermost layer (test method 4) from the cross-sectional photo, obtain the ratio of the outermost layer to the whole fiber, and then use an alkaline solution for dissolution treatment, and control the weight loss rate to remove the outermost polymer B. With respect to the remaining fibers (weight N2) after the dissolution treatment, the weight of the metal element in the remaining portion was measured by an X-ray fluorescence spectrometer (manufacturer: Rigaku, model: ZSX Primus III+) (inorganic particle weight M2 was calculated). 10 samples were taken for testing, and the final results were averaged.

,

.

(6) Reflectivity of visible light According to the standards and terms in GB/T3291.2 and GB/T3291.3, the fibers are made into undyed fabrics, and the fabrics are cut into square pieces of 5cm×5cm using an integrating sphere photometer. In the case of no defects, face the light source with the fabric away from the skin when worn, measure its reflectance and record the reflectance R1 at a wavelength of 550 nm; If it is necessary to test the reflectivity in the state of liquid immersion, immerse the sample in tertiary water, adjust the moisture content of the sample to 100% (the quality after water immersion is 2 times before immersion). Wear the fabric away from the skin facing the light source, measure its reflectance and record the reflectance R2 at a wavelength of 550 nm; The reflectivity difference between wet and dry states = |R1-R2|. 10 samples were taken for testing, and the final results were averaged.

(7) Judgment of fading in dry and wet state With reference to JIS L 0804:2005 Discoloration, Gray Card Judgment Standard, the fabrics in dry and wet state (liquid is not limited to water) are judged and rated for color. 10 samples were taken for testing, and the final results were averaged. Grade 4: No obvious discoloration and fading ○; Grades 3-4: Slight discoloration and discoloration △; Grade 3 and below: Obvious discoloration and discoloration ×.

(8) Strength and elongation product of fiber According to the standard GB/T14344-2008, the strength and elongation of fiber are respectively tested, and the strength and elongation product of fiber is calculated by the following formula: Strength and elongation product=strength×(elongation) ^1/2 . 10 samples were taken for testing, and the final results were averaged.

(9) Light fastness According to the standard JIS L0842, the light fastness test was carried out for 20 hours, and the samples after irradiation treatment were compared with the unirradiated control samples, and judged according to the standard contrast gray card to determine the light fastness level. 10 samples were taken for testing, and the final results were averaged. The light fastness grade 4 and above was judged as ○, and the light fastness grade 3 and below was judged as △.

(10) Rutile Titanium Dioxide The obtained fibers are melted to prepare a film, and the crystallographic peak position of the X-ray diffraction device is tested, and the crystallographic peak position of the usual rutile titanium dioxide is tested at the same time.

(11) Spinning property Count the floating and broken yarns in the spinning process. When the number of floating and broken yarns is less than 1 time/t, the spinnability is judged to be 0; when the number of floating and broken yarns is greater than 1 time/t, the spinning The sex judgment is ×. [Example]

The present invention will be described in detail below with reference to the embodiments.

[Example 1] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 17.3, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.8%, a difference of 550 nm dry and wet reflectance of 1.2%, and has anti-ultraviolet performance and light fastness.

[Example 2] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 30% of the overall cross-sectional area. The strength and elongation product of the raw yarn is 17.5, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.1%, a difference of 550 nm dry and wet reflectance of 2.3%, and has anti-ultraviolet performance and light fastness.

[Example 3] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross-section of the fiber is a multi-layer concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 10% of the overall cross-sectional area, and the strand strength and elongation area is 17.7. The tube knitted fabric has an anti-penetration property of 94.9%, a 550-nm dry-wet reflectance difference of 1.1%, and has anti-ultraviolet performance and qualified light fastness.

[Example 4] 60 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 40 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 16.3, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 95.1%, a difference of 550 nm dry and wet reflectance of 0.9%, and has anti-ultraviolet performance and light fastness.

[Example 5] 70 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 30 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 15.5, and the obtained fiber is made into a tubular knitted fabric. The obtained tubular knitted fabric has an anti-penetration performance of 95.3%, a difference of 550 nm dry and wet reflectance of 0.8%, and has anti-ultraviolet performance and light fastness.

[Example 6] 30 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 30.0 wt % of rutile-type TiO ₂ particles and 70 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The strength and elongation product of the raw yarn is 17.5, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 95.4%, a difference of 550 nm dry and wet reflectivity of 0.7%, and has anti-ultraviolet performance and light fastness.

[Example 7] 20 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 60.0 wt % of rutile-type TiO ₂ particles and 80 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 19.1, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 96.3%, a difference of 550 nm dry and wet reflectivity of 0.4%, and has anti-ultraviolet performance and light fastness.

[Example 8] 50 parts by weight of nylon 6 (N6) (polymer A) containing 15.0 wt % of rutile-type _TiO particles and 50 parts by weight of semi-dull nylon 6 (polymer A) containing 0.3 wt % of _TiO particles were combined B) Respectively pre-crystallize, dry to below 50ppm, put into spinning A and B bins respectively, spin and false twist to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 21.5, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.3%, a difference of 550 nm dry and wet reflectance of 1.4%, and has anti-ultraviolet performance and light fastness.

[Example 9] 50 parts by weight of polypropylene (PP) containing 15.0 wt % of rutile-type TiO ₂ particles (polymer A) and 50 parts by weight of polypropylene (PP) containing 0.3 wt % of TiO ₂ particles (polymerization Material B) were dried to below 50 ppm, respectively put into spinning A and B bins for spinning and false twisting to obtain long fibers with high anti-penetration performance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 21.6, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.3%, a difference of 550 nm dry and wet reflectivity of 1.5%, and has anti-ultraviolet performance and light fastness.

[Example 10] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 2.7 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The strength and elongation product of the raw yarn is 15.2, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.6%, a difference of 550 nm dry and wet reflectance of 1.1%, and has anti-ultraviolet performance and light fastness.

[Example 11] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 5.0 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 15.0, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.9%, a difference of 550 nm dry and wet reflectivity of 1.0%, and has anti-ultraviolet performance and light fastness.

[Example 12] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of zinc oxide particles and 50 parts by weight of semi-matte polymer containing 0.3 wt % of _TiO The ester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 15.6, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.2%, a difference of 550 nm dry and wet reflectance of 3.2%, and has anti-ultraviolet performance and light fastness.

[Example 13] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 5 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 18.5, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.4%, and a difference of 550 nm dry and wet reflectance of 1.4%. It has UV resistance and qualified light fastness.

[Example 14] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross-section of the fiber is a multi-layer concentric circle structure, the number of layers is 9, and the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 19.2, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.2%, a difference of 550 nm dry and wet reflectance of 1.8%, and has anti-ultraviolet performance and light fastness.

[Example 15] 45 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 30.0 wt % of rutile-type TiO ₂ particles, 45 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles Semi-dull polyester (polymer B) and 10 parts by weight of polymer C containing 0.1wt% antibacterial particles were pre-crystallized, dried to below 50ppm, respectively put into spinning bins for spinning and false twisting to obtain high permeability resistance of long fibers. The cross section of the fiber is multi-layered, the number of layers is 3, the polymer C is in the innermost layer, the polymer A is in the middle layer, and the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The product of strength and elongation is 15.1, and the obtained fiber is made into a tubular fabric. The obtained tubular fabric has an anti-penetration property of 95.8%, a difference of 550 nm dry and wet reflectivity of 0.7%, and has both UV resistance and excellent antibacterial properties. , Light fastness is qualified.

[Example 16] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of anatase TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 17.5, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.4%, a difference of 550 nm dry and wet reflectance of 1.4%, and has UV resistance and light fastness.

[Example 17] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer hollow concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall area of the section. The tensile and elongation product of the raw yarn is 16.2, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 94.4%, and a difference of 550 nm dry and wet reflectivity of 1.8%. It has anti-ultraviolet performance and qualified light fastness.

[Example 18] 70 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 10.0 wt % of rutile-type TiO ₂ particles and 30 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 15.1, and the obtained fiber is made into a tubular knitted fabric. The obtained tubular knitted fabric has an anti-penetration property of 94.1%, a difference of 550 nm dry and wet reflectance of 2.7%, and has anti-ultraviolet performance and light fastness.

[Example 19] 10 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 70.0 wt % of rutile-type TiO ₂ particles and 90 parts by weight of 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 19.7, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.8%, a difference of 550 nm dry and wet reflectance of 1.9%, and has anti-ultraviolet performance and light fastness.

[Example 20] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 15 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall area of the section. The tensile and elongation product of the raw yarn is 17.1, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.0%, a difference of 550 nm dry and wet reflectance of 2.8%, and has anti-ultraviolet performance and light fastness.

[Example 21] 20 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 60.0 wt % of rutile-type TiO ₂ particles and 80 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 40% of the overall cross-sectional area. The strength and elongation product of the raw yarn is 19.2, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.3%, a difference of 550 nm dry and wet reflectance of 1.8%, and has anti-ultraviolet performance and light fastness.

[Example 22] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15.0 wt % of rutile-type TiO ₂ particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of TiO ₂ particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 3% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 17.1, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration property of 95.0%, a 550 nm dry and wet reflectance difference of 1.0%, and has anti-ultraviolet performance and light fastness.

[Example 23] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 70.0 wt % of rutile-type _TiO particles and 50 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of _TiO particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The tensile and elongation product of the raw yarn is 15.0, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 97.3%, a difference of 550 nm dry and wet reflectance of 0.2%, and has anti-ultraviolet performance and light fastness.

[Comparative Example 1] 70 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 7.5 wt % of rutile-type _TiO particles and 30 parts by weight of polyethylene terephthalate (PET) containing 0.3 wt % of _TiO particles The semi-dull polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross-section of the fiber is a multi-layer concentric circle structure, the number of layers is 3, and the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area, and the tensile and elongation area of the precursor is 15.3. The tube knitted fabric has an anti-penetration performance of 86.9%, a difference of 550 nm dry and wet reflectivity of 6.3%, no UV resistance, obvious discoloration after being soaked in water, and qualified light fastness. When the content of inorganic particles in polymer A is less than 10.0 wt%, even if the content of polymer A in the composite fiber reaches 70 wt%, the anti-penetration effect of the composite fiber is not good, and the obtained fabric has poor UV resistance and dry-wet fading .

[Comparative Example 2] 45 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 30.0 wt % of rutile-type TiO ₂ particles, 45 parts by weight of 0.3 wt % of TiO ₂ particles Semi-dull polyester (polymer B) and 10 parts by weight of polymer C containing 0.07wt% TiO ₂ particles were pre-crystallized, dried to below 50 ppm, respectively put into spinning bins for spinning and false twisting to obtain high anti-penetration Performance long fibers. The cross-section of the fiber is multi-layered, the number of layers is 3, the polymer A is in the innermost layer, the polymer B is in the middle layer, and the polymer C is in the outermost layer, and the outermost layer area accounts for 10% of the overall cross-sectional area. The product of strength and elongation is 16.4, and the obtained fiber is made into a tubular fabric. The obtained tubular fabric has an anti-penetration property of 90.8%, a difference of 5.9% in dry and wet reflectivity at 550 nm, and has no UV resistance. , Light fastness is qualified. Although it is also a three-layer cross-sectional structure, it is no different from the usual core-sheath fiber, and the polymer A with the highest inorganic particle content is placed in the innermost layer of the fiber. The property is not good, and the anti-ultraviolet and dry and wet discoloration and fading effect of the fabric are poor.

[Comparative Example 3] 8 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 70 wt % of rutile _- type _TiO The matte polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, and put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The strength and elongation product of the raw yarn is 19.9, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 86.4%, a difference of 550 nm dry and wet reflectivity of 12.4%, and has no UV resistance. The discoloration is obvious, and the light fastness is qualified. When the content of polymer A in the composite fiber is less than 10%, even if the content of inorganic particles in polymer A reaches 70.0wt%, the anti-penetration effect of the composite fiber is not good, and the obtained fabric has poor resistance to ultraviolet rays and fading from wet and dry.

[Comparative Example 4] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15 wt % of rutile _- type _TiO The matte polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, and put into spinning A and B bins for spinning. Broken filaments occurred during spinning, and the filaments were floating. In addition, when the obtained POY is subjected to false twisting, yarn breakage occurs, and a large amount of white powder is generated when passing through the yarn guide, so that it cannot be crimped for a long time. False twisting produces long fibers with high anti-permeability. The cross section of the fibers is a multi-layer concentric structure with 3 layers. The polymer B is in the outermost layer, and the outermost layer accounts for 20% of the overall area of the section. The strength and elongation product of the raw yarn is 13.7, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 94.4%, a difference of 550 nm dry and wet reflectivity of 1.2%, and has anti-ultraviolet performance. Not obvious, light fastness is qualified. When the content of inorganic particles in the outermost polymer B is more than 5.0 wt%, the spinning process is seriously interrupted and the spinnability is poor.

[Comparative Example 5] 50 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 15 wt % of rutile _- type _TiO The matte polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, and put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 20 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The obtained fiber has an abnormal cross-section, and the tensile and elongation product of the raw fiber is 15.4. The obtained fiber is made into a tube knitted fabric. The anti-penetration performance of the obtained tube knitted fabric is 86.4%, and the difference between the dry and wet reflectance at 550 nm is 9.4%. It has anti-ultraviolet performance, obvious discoloration after being soaked in water, and the light fastness is qualified. Due to too many layers, the forming of the fiber section is abnormal, and the anti-permeability, anti-ultraviolet, dry and wet discoloration and fading effect are not good.

[Comparative Example 6] 10 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 80 wt % of rutile-type _{TiO 2} particles and 70 parts by weight of a semi-polymer containing 0.3 wt % of TiO The matte polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, and put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, in which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. During the spinning process, due to the poor fluidity of the polymer A and the abnormal cross-section recombination, the filaments were broken during spinning, and the filaments were floating. In addition, when the obtained POY is subjected to false twisting, yarn breakage occurs, and a large amount of white powder is generated when passing through the yarn guide, so that it cannot be crimped for a long time. The strength and elongation product of the raw yarn is 17.2, and the obtained fiber is made into a tube knitted fabric. The obtained tube knitted fabric has an anti-penetration performance of 95.9%, a 550 nm dry and wet reflectivity difference of 0.6%, and has anti-ultraviolet performance. Obvious discoloration, light fastness is qualified. When the content of inorganic particles in polymer A is higher than 70.0wt%, the spinning process is seriously interrupted and the spinnability is poor.

[Comparative Example 7] 75 parts by weight of polyethylene terephthalate (PET) (polymer A) containing 10 wt % of rutile _- type _TiO The matte polyester (polymer B) was pre-crystallized and dried to below 50 ppm, respectively, and put into spinning A and B bins for spinning and false twisting to obtain long fibers with high permeability resistance. The cross section of the fiber is a multi-layer concentric circle structure with 3 layers, of which the polymer B is in the outermost layer, and the outermost layer area accounts for 20% of the overall cross-sectional area. The fiber strength and elongation product is 12.7. During the spinning process, because the fiber strength and elongation product is too small, the broken silk appears. And in the process of processing, poor workability and wire breakage also occur. The obtained fiber is made into a tubular knitted fabric, and the obtained tubular knitted fabric has an anti-penetration property of 94.9%, a 550-nm dry-wet reflectance difference of 1.2%, and has anti-ultraviolet performance and qualified light fastness. When the content of polymer A in the composite fiber is higher than 70%, the strength and elongation product of the fiber is small and cannot meet the requirements of normal use. [Table 1] polymer A polymer B multi-layer fiber fabric polymer inorganic particles Particle content wt% polymer inorganic particles Particle content wt% compound ratio Section shape layers outermost polymer Outermost area ratio Inorganic particle content wt% from polymer A spinnability Strength and elongation product Impermeability% anti-UV Wet and dry discoloration Dry and wet reflectivity difference% light fastness Example 1 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 20% 7.5 ○ 17.3 94.8 ○ ○ 1.2 ○ Example 2 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 30% 7.5 ○ 17.5 94.1 ○ ○ 2.3 ○ Example 3 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 10% 7.5 ○ 17.7 94.9 ○ ○ 1.1 ○ Example 4 PET TiO ₂ 15.0 PET TiO ₂ 0.3 60/40 concentric circles 3 B 20% 9.0 ○ 16.3 95.1 ○ ○ 0.9 ○ Example 5 PET TiO ₂ 15.0 PET TiO ₂ 0.3 70/30 concentric circles 3 B 20% 10.5 ○ 15.5 95.3 ○ ○ 0.8 ○ Example 6 PET TiO ₂ 30.0 PET TiO ₂ 0.3 30/70 concentric circles 3 B 20% 9.0 ○ 17.5 95.4 ○ ○ 0.7 ○ Example 7 PET TiO ₂ 60.0 PET TiO ₂ 0.3 20/80 concentric circles 3 B 20% 12.0 ○ 19.1 96.3 ○ ○ 0.4 ○ Example 8 N6 TiO ₂ 15.0 N6 TiO ₂ 0.3 50/50 concentric circles 3 B 20% 7.5 ○ 21.5 94.3 ○ ○ 1.4 ○ Example 9 PP TiO ₂ 15.0 PP TiO ₂ 0.3 50/50 concentric circles 3 B 20% 7.5 ○ 21.6 94.3 ○ ○ 1.5 ○ Example 10 PET TiO ₂ 15.0 PET TiO ₂ 2.7 50/50 concentric circles 3 B 20% 7.5 ○ 15.2 94.6 ○ ○ 1.1 ○ Example 11 PET TiO ₂ 15.0 PET TiO ₂ 5.0 50/50 concentric circles 3 B 20% 7.5 ○ 15.0 94.9 ○ ○ 1.0 ○ Example 12 PET ZnO 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 20% 7.5 ○ 15.6 94.2 ○ ○ 3.2 ○ Example 13 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 5 B 20% 7.5 ○ 18.5 94.4 ○ ○ 1.4 ○ Example 14 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 9 B 20% 7.5 ○ 19.2 94.2 ○ ○ 1.8 ○ Example 15 PET TiO ₂ 30.0 PET TiO ₂ 0.3 45/45 concentric circles 3 B 20% 13.5 ○ 15.1 95.8 ○ ○ 0.7 ○ [Table 2] polymer A polymer B multi-layer fiber fabric polymer inorganic particles Particle content wt% polymer inorganic particles Particle content wt% compound ratio Section shape layers outermost polymer Outermost area ratio Inorganic particle content wt% from polymer A spinnability Strength and elongation product Impermeability% anti-UV Wet and dry discoloration Dry and wet reflectivity difference% light fastness Example 16 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 20% 7.5 ○ 17.5 94.4 ○ ○ 1.4 ○ Example 17 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 hollow concentric 3 B 20% 7.5 ○ 16.2 94.4 ○ ○ 1.8 ○ Example 18 PET TiO ₂ 10.0 PET TiO ₂ 0.3 70/30 concentric circles 3 B 20% 7.0 ○ 15.1 94.1 ○ ○ 2.7 ○ Example 19 PET TiO ₂ 70.0 PET TiO ₂ 0.3 10/90 concentric circles 3 B 20% 7.0 ○ 19.7 94.8 ○ ○ 1.9 ○ Example 20 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 15 B 20% 7.5 ○ 17.1 94.0 ○ ○ 2.8 ○ Example 21 PET TiO ₂ 60.0 PET TiO ₂ 0.3 20/80 concentric circles 3 B 40% 12.0 ○ 19.2 94.3 ○ ○ 1.8 ○ Example 22 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 3% 7.5 ○ 17.1 95.0 ○ ○ 1.0 ○ Example 23 PET TiO ₂ 70.0 PET TiO ₂ 0.3 50/50 concentric circles 3 B 20% 35.0 ○ 15.0 97.3 ○ ○ 0.2 ○ Comparative Example 1 PET TiO ₂ 7.5 PET TiO ₂ 0.3 70/30 concentric circles 3 B 20% 5.35 ○ 15.3 86.9 × × 6.3 ○ Comparative Example 2 PET TiO ₂ 30.0 PET TiO ₂ 0.3 45/45 concentric circles 3 C 10% 13.5 ○ 16.4 90.8 × × 5.9 ○ Comparative Example 3 PET TiO ₂ 70.0 PET TiO ₂ 0.3 8/92 concentric circles 3 B 20% 5.6 ○ 19.9 86.4 × × 12.4 ○ Comparative Example 4 PET TiO ₂ 15.0 PET TiO ₂ 5.5 50/50 concentric circles 3 B 20% 7.5 × 13.7 94.4 ○ ○ 1.2 ○ Comparative Example 5 PET TiO ₂ 15.0 PET TiO ₂ 0.3 50/50 concentric circles 20 B 20% 7.5 ○ 15.4 86.4 × × 9.4 ○ Comparative Example 6 PET TiO ₂ 80.0 PET TiO ₂ 0.3 10/90 concentric circles 3 B 20% 8.0 × 17.2 95.9 〇 〇 0.6 ○ Comparative Example 7 PET TiO ₂ 10.0 PET TiO ₂ 0.3 75/25 concentric circles 3 B 20% 7.5 ○ 12.7 94.9 〇 〇 1.2 ○

1: Polymer A 2: Polymer B

Figure 1 is a cross-sectional view of a 9-layer concentric circular composite cross-section structural fiber. Figure 2 is a cross-sectional view of a 3-layer concentric circular composite cross-sectional structural fiber. Figure 3 is a cross-sectional view of a side-by-side multilayer composite cross-sectional structural fiber.

In FIGS. 1 to 3 , reference numeral 1 denotes a polymer A, and reference numeral 2 denotes a polymer B. As shown in FIG.

1: Polymer A

2: Polymer B

Claims (10)

A multi-layer cross-sectional composite fiber, characterized in that: the cross-section of the fiber has a multi-layer cross-sectional structure of 3 to 15 layers formed by alternately arranging at least two components, and the outermost layer of the multi-layer cross-sectional structure is composed of inorganic particles. 5.0 wt% or less of polymer B, at least one layer of the composite fiber is formed of polymer A with an inorganic particle content of 10.0-70.0 wt%, and polymer A accounts for 10-70 wt% of the composite fiber. The multi-layer cross-section conjugated fiber according to claim 1, wherein the content of the inorganic particles derived from the polymer A in the conjugated fiber is 7.0 to 30.0 wt %. The multi-layer cross-section composite fiber according to claim 1 or 2, wherein the cross-section of the fiber has a cross-sectional structure of 3 to 9 layers formed by alternately arranging polymer A and polymer B. The multi-layer cross-section composite fiber according to claim 1 or 2, wherein the content of inorganic particles in the polymer A is 15-60 wt %. The multi-layer cross-sectional composite fiber of claim 1 or 2, wherein the area of the outermost layer of the multi-layer cross-sectional structure accounts for 5-30% of the overall cross-sectional area. The multi-layer cross-section composite fiber according to claim 1 or 2, wherein the polymer is polyester, nylon, polypropylene or polyurethane. The multi-layer cross-section composite fiber according to claim 1 or 2, wherein the absolute value of the difference in visible light reflectance at a wavelength of 550 nm is less than 5.0% in the dry and wet state of the composite fiber. The multi-layer cross-section conjugated fiber according to claim 1 or 2, wherein the strength-elongation product of the conjugated fiber is 15.0 or more. A fabric obtained from the preparation of the multi-layer cross-section composite fiber of claim 1. The fabric of claim 9, wherein the absolute value of the difference in the visible light reflectivity difference at a wavelength of 550 nm in the wet and dry state of the fabric is less than 5.0%.

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