Flame-retardant composite yarn and production method thereof

Abstract

The production method of the flame-retardant composite yarn comprises the following steps that S1, para-aramid pre-oxidized fiber polyacrylonitrile blended yarn is selected as a core yarn, wool acrylic blended yarn is selected as a main body yarn, and PSA polyester blended filament yarn is selected as a fixed yarn; s2, dipping flame-retardant modification of the main body line: mixing and dissolving 40-50 parts of PEPA, 90-100 parts of ammonium polyphosphate, 10-14 parts of dodecyl alcohol ester, 6-12 parts of glyceryl stearate and 3-7 parts of titanate in a 45-55 wt% ethanol aqueous solution to prepare 20-30 wt% flame-retardant modification liquid, soaking the main body line in the modification liquid at 40-55 DEG C for 2.5-4 hours, and drying the main body line with hot air after soaking; and S3, compounding and doubling: taking the core wire as a center, winding and twisting the main body wire on the core wire in a forward direction, and twisting the fixed wire on the main body wire in a reverse direction. The composite yarn produced by the method has excellent flame retardant property, and the fabric of the composite yarn still keeps the fluffy feeling, the soft and comfortable feeling and the warm-keeping characteristic of wool acrylic fibers.

Description

Technical Field

[0001] The invention relates to a composite yarn, in particular to a flame retardant composite yarn and a production method thereof. Background Art

[0002] In recent years, fluffy and soft fabrics, such as wool, acrylic and other blended fabrics, have been loved by people because of their fluffy, soft, comfortable and warm properties. However, such fabrics are not flame retardant, which limits their application scenarios.

[0003] If the above fabrics or their raw yarns are flame-retardantly modified according to the prior art, the original properties of the fabrics will be affected and their feel and style will be reduced. Summary of the invention

[0004] In view of the content in the background technology, the present invention introduces a flame retardant composite yarn and a production method thereof. While the composite yarn has excellent flame retardant properties, its fabric still retains the fluffiness, softness, comfort and warmth retention properties of wool acrylic.

[0005] A method for producing a flame-retardant composite yarn is disclosed, comprising the following steps:

[0006] S1. Select para-aramid pre-oxidized silk polyacrylonitrile blended yarn as the core yarn, select wool acrylic blended yarn as the main yarn, and select PSA polyester blended filament as the solid yarn.

[0007] S2. Flame retardant modification of the main line by dipping: 40-50 parts of PEPA, 90-100 parts of ammonium polyphosphate, 10-14 parts of dodecyl alcohol ester, 6-12 parts of glycerol stearate and 3-7 parts of titanate are mixed and dissolved in a 45-55wt% ethanol aqueous solution to prepare a 20-30wt% flame retardant modified liquid, the above parts are all parts by weight, the main line is immersed in the modified liquid at 40-55℃ for 2.5-4h, and the main line is dried by hot air after immersion;

[0008] In the formula of the flame-retardant modified liquid, ammonium polyphosphate and PEPA form a flame-retardant system with rich carbon and acid sources. When heated, they can immediately decompose and expand, and dehydrate and carbonize the yarn. The dense carbonized layer covers the surface of the yarn to achieve the flame-retardant effect of isolating oxygen and blocking combustion; dodecyl alcohol ester and glycerol stearate can increase the film-forming property of the modified liquid, and after drying, they can form a smooth and soft flame-retardant film on the surface of the main line, so that the wool-acrylic blended yarn has excellent flame retardancy, and the fabric produced by the flame-retardant composite yarn still has good fluffiness and softness; and a small amount of titanate can improve the compatibility of the components in the modified liquid.

[0009] S3. Composite parallel wire: With the core wire as the center, the main wire is twisted around the core wire in the forward direction, and the solid wire is twisted on the main wire in the reverse direction.

[0010] Preferably, the para-aramid pre-oxidized polyacrylonitrile blended yarn contains 30% para-aramid and 70% pre-oxidized polyacrylonitrile, and the percentage is the mass percentage. Such a core wire itself has high temperature resistance and flame retardant properties, and the pre-oxidized polyacrylonitrile can improve the flexibility of the core wire; the wool acrylic blended yarn contains 25% wool and 75% acrylic, and the percentage is the mass percentage. Such a main line has good fluffiness and softness; the PSA polyester blended filament contains 65% PSA and 35% polyester, and the percentage is the mass percentage. The solid line is a blend of polyester and PSA fibers. Polyester filaments do not have flame retardancy, while PSA fibers are non-flammable and highly heat-resistant, which can make the PSA polyester blended filaments have certain flame retardancy.

[0011] Preferably, the PSA polyester blended filaments are modified by being impregnated with a 4wt% SEBS solution to improve the strength of the solid thread.

[0012] Preferably, the main thread is S-twisted and has a count of 45-53, and the solid thread is Z-twisted and has a count of 25-33.

[0013] Disclosed is a flame retardant composite yarn, which is prepared by the above method.

[0014] Disclosed is a fluffy and soft flame-retardant fabric, which is woven from the flame-retardant composite yarn.

[0015] Through the above technical solution, the present invention at least includes the following beneficial effects:

[0016] The flame-retardant composite yarn described in the present application is composed of para-aramid pre-oxidized silk polyacrylonitrile blended yarn as the core yarn, wool acrylic blended yarn as the main yarn, and PSA polyester blended filament as the solid yarn. The core yarn and the solid yarn themselves have good flame-retardant properties, and the main yarn is flame-retardantly modified by impregnation with the modifying liquid of the present application, so that the composite yarn has excellent flame-retardant properties, and its fabric still retains the fluffy, soft, comfortable and warm properties of wool acrylic. DETAILED DESCRIPTION

[0017] The technical solution of the invention will be clearly and completely described below through embodiments, and the application of the present invention is not limited to the embodiments given.

[0018] Example 1

[0019] A method for producing a flame retardant composite yarn comprises the following steps:

[0020] S1. Select para-aramid pre-oxidized polyacrylonitrile blended yarn as the core yarn, select wool acrylic blended yarn as the main yarn, and select PSA polyester blended filament as the solid yarn;

[0021] The para-aramid pre-oxidized polyacrylonitrile blended yarn contains 30% para-aramid and 70% pre-oxidized polyacrylonitrile, and the percentage is the mass percentage. Such a core line itself has high temperature resistance and flame retardant properties, and the pre-oxidized polyacrylonitrile can improve the flexibility of the core line; the wool acrylic blended yarn contains 25% wool and 75% acrylic, and the percentage is the mass percentage. Such a main line has good fluffiness and softness; the PSA polyester blended filament contains 65% PSA and 35% polyester, and the percentage is the mass percentage. The solid line is a blend of polyester and PSA fibers. The polyester filament does not have flame retardancy, while the PSA fiber is non-flammable and has high heat resistance, which can make the PSA polyester blended filament have certain flame retardancy. The PSA polyester blended filament is also impregnated and modified with a 4wt% SEBS solution to improve the strength of the solid line.

[0022] S2. Flame retardant modification of the main line by dipping: 45 parts of PEPA, 95 parts of ammonium polyphosphate, 12 parts of dodecyl alcohol ester, 9 parts of glycerol stearate and 5 parts of titanate are mixed and dissolved in a 50wt% ethanol aqueous solution to prepare a 25wt% flame retardant modified liquid, the above parts are all parts by weight, the main line is immersed in the modified liquid at 48°C for 3.5h, and the main line is dried by hot air after immersion;

[0023] In the formula of the flame-retardant modified liquid, ammonium polyphosphate and PEPA form a flame-retardant system with rich carbon and acid sources. When heated, they can immediately decompose and expand, and dehydrate and carbonize the yarn. The dense carbonized layer covers the surface of the yarn to achieve the flame-retardant effect of isolating oxygen and blocking combustion; dodecyl alcohol ester and glycerol stearate can increase the film-forming property of the modified liquid, and after drying, they can form a smooth and soft flame-retardant film on the surface of the main line, so that the wool-acrylic blended yarn has excellent flame retardancy, and the fabric produced by the flame-retardant composite yarn still has good fluffiness and softness; and a small amount of titanate can improve the compatibility of the components in the modified liquid.

[0024] S3. Composite parallel wire: With the core wire as the center, the main wire is twisted around the core wire in the forward direction, and the solid wire is twisted on the main wire in the reverse direction; the main wire is S twisted and has a count of 48, and the solid wire is Z twisted and has a count of 29.

[0025] The flame-retardant composite yarn produced by the method can be woven into a flame-retardant fabric with fluffy, soft, comfortable and warm properties.

[0026] Example 2

[0027] A method for producing a flame retardant composite yarn comprises the following steps:

[0028] S1. Select para-aramid pre-oxidized polyacrylonitrile blended yarn as the core yarn, select wool acrylic blended yarn as the main yarn, and select PSA polyester blended filament as the solid yarn;

[0029] The para-aramid pre-oxidized polyacrylonitrile blended yarn contains 30% para-aramid and 70% pre-oxidized polyacrylonitrile, and the percentage is the mass percentage. Such a core line itself has high temperature resistance and flame retardant properties, and the pre-oxidized polyacrylonitrile can improve the flexibility of the core line; the wool acrylic blended yarn contains 25% wool and 75% acrylic, and the percentage is the mass percentage. Such a main line has good fluffiness and softness; the PSA polyester blended filament contains 65% PSA and 35% polyester, and the percentage is the mass percentage. The solid line is a blend of polyester and PSA fibers. The polyester filament does not have flame retardancy, while the PSA fiber is non-flammable and has high heat resistance, which can make the PSA polyester blended filament have certain flame retardancy. The PSA polyester blended filament is also impregnated and modified with a 4wt% SEBS solution to improve the strength of the solid line.

[0030] S2. Flame retardant modification of the main line by dipping: 40 parts of PEPA, 100 parts of ammonium polyphosphate, 10 parts of dodecyl alcohol ester, 12 parts of glycerol stearate and 3 parts of titanate were mixed and dissolved in a 55wt% ethanol aqueous solution to prepare a 20wt% flame retardant modified liquid, the above parts are all parts by weight, the main line was immersed in the modified liquid at 40 ° C for 2.5h, and the main line was dried by hot air after immersion;

[0031] In the formula of the flame-retardant modified liquid, ammonium polyphosphate and PEPA form a flame-retardant system with rich carbon and acid sources. When heated, they can immediately decompose and expand, and dehydrate and carbonize the yarn. The dense carbonized layer covers the surface of the yarn to achieve the flame-retardant effect of isolating oxygen and blocking combustion; dodecyl alcohol ester and glycerol stearate can increase the film-forming property of the modified liquid, and after drying, they can form a smooth and soft flame-retardant film on the surface of the main line, so that the wool-acrylic blended yarn has excellent flame retardancy, and the fabric produced by the flame-retardant composite yarn still has good fluffiness and softness; and a small amount of titanate can improve the compatibility of the components in the modified liquid.

[0032] S3. Composite parallel wire: With the core wire as the center, the main wire is twisted around the core wire in the forward direction, and the solid wire is twisted on the main wire in the reverse direction; the main wire is S twisted and has a count of 53, and the solid wire is Z twisted and has a count of 33.

[0033] The flame-retardant composite yarn produced by the method can be woven into a flame-retardant fabric with fluffy, soft, comfortable and warm properties.

[0034] Example 3

[0035] A method for producing a flame retardant composite yarn comprises the following steps:

[0036] S1. Select para-aramid pre-oxidized polyacrylonitrile blended yarn as the core yarn, select wool acrylic blended yarn as the main yarn, and select PSA polyester blended filament as the solid yarn;

[0037] The para-aramid pre-oxidized polyacrylonitrile blended yarn contains 30% para-aramid and 70% pre-oxidized polyacrylonitrile, and the percentage is the mass percentage. Such a core line itself has high temperature resistance and flame retardant properties, and the pre-oxidized polyacrylonitrile can improve the flexibility of the core line; the wool acrylic blended yarn contains 25% wool and 75% acrylic, and the percentage is the mass percentage. Such a main line has good fluffiness and softness; the PSA polyester blended filament contains 65% PSA and 35% polyester, and the percentage is the mass percentage. The solid line is a blend of polyester and PSA fibers. The polyester filament does not have flame retardancy, while the PSA fiber is non-flammable and has high heat resistance, which can make the PSA polyester blended filament have certain flame retardancy. The PSA polyester blended filament is also impregnated and modified with a 4wt% SEBS solution to improve the strength of the solid line.

[0038] S2. Flame retardant modification of the main line by dipping: 50 parts of PEPA, 90 parts of ammonium polyphosphate, 14 parts of dodecyl alcohol ester, 6 parts of glycerol stearate and 7 parts of titanate are mixed and dissolved in a 45wt% ethanol aqueous solution to prepare a 30wt% flame retardant modification liquid, the above parts are all parts by weight, the main line is immersed in the modification liquid at 55°C for 4h, and the main line is dried by hot air after immersion;

[0039] In the formula of the flame-retardant modified liquid, ammonium polyphosphate and PEPA form a flame-retardant system with rich carbon and acid sources. When heated, they can immediately decompose and expand, and dehydrate and carbonize the yarn. The dense carbonized layer covers the surface of the yarn to achieve the flame-retardant effect of isolating oxygen and blocking combustion; dodecyl alcohol ester and glycerol stearate can increase the film-forming property of the modified liquid, and after drying, they can form a smooth and soft flame-retardant film on the surface of the main line, so that the wool-acrylic blended yarn has excellent flame retardancy, and the fabric produced by the flame-retardant composite yarn still has good fluffiness and softness; and a small amount of titanate can improve the compatibility of the components in the modified liquid.

[0040] S3. Composite parallel wire: With the core wire as the center, the main wire is twisted around the core wire in the forward direction, and the solid wire is twisted on the main wire in the reverse direction; the main wire is S twisted and has a count of 45, and the solid wire is Z twisted and has a count of 25.

[0041] The flame-retardant composite yarn produced by the method can be woven into a flame-retardant fabric with fluffy, soft, comfortable and warm properties.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Based on the present invention and the above description, relevant personnel can make various changes and modifications without departing from the technical idea of ​​the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0043] The performance tests of the products in the above embodiments are carried out according to the following standards:

[0044] With reference to the vertical method in GB / T 5455-1997, the afterflaming and smoldering duration of the sample were measured on a vertical combustion tester.

[0045] Referring to the oxygen index method in GB / T 5454-1997, the limiting oxygen index of the sample is determined using a limiting oxygen index measuring instrument.

[0046] The results are shown in Table 1 below, which are average values ​​of multiple samples.

[0047] Table 1:

[0048]

[0049] Example 1 is the best implementation scheme of the present application. As can be seen from the above table, the products of each example of the present application have excellent flame retardant effects.

Claims

1. A method for producing a flame retardant composite yarn, characterized in that: The following steps are involved: S1. Select para-aramid pre-oxidized polyacrylonitrile blended yarn as the core yarn, select wool acrylic blended yarn as the main yarn, and select PSA polyester blended filament as the solid yarn; S2. Flame retardant modification of the main line by dipping: 40-50 parts of PEPA, 90-100 parts of ammonium polyphosphate, 10-14 parts of dodecyl alcohol ester, 6-12 parts of glycerol stearate and 3-7 parts of titanate are mixed and dissolved in a 45-55wt% ethanol aqueous solution to prepare a 20-30wt% flame retardant modification liquid, and the main line is immersed in a 40-55℃ modification liquid for 2.5-4h, and the main line is dried by hot air after immersion; S3. Composite parallel wire: With the core wire as the center, the main wire is twisted around the core wire in the forward direction, and the solid wire is twisted on the main wire in the reverse direction.

2. The method for producing a flame-retardant composite yarn according to claim 1, characterized in that: The para-aramid preoxidized silk polyacrylonitrile blended yarn contains 30% para-aramid and 70% preoxidized silk polyacrylonitrile, the wool acrylic blended yarn contains 25% wool and 75% acrylic, and the PSA polyester blended filament contains 65% PSA and 35% polyester.

3. The method for producing a flame-retardant composite yarn according to claim 2, characterized in that: The PSA polyester blended filaments are modified by impregnation with a SEBS solution.

4. The method for producing a flame-retardant composite yarn according to claim 1, characterized in that: The main thread is S-twisted and has a count of 45-53, and the solid thread is Z-twisted and has a count of 25-33.

5. A flame retardant composite yarn, characterized in that: Prepared by the method according to any one of claims 1 to 4.

6. A fluffy and soft flame-retardant fabric, characterized in that: It is woven from the flame-retardant composite yarn described in claim 5.

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