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CN-121976354-A - Super-soft high-fluffiness melt-blown thermal insulation flocculus and preparation method thereof

CN121976354ACN 121976354 ACN121976354 ACN 121976354ACN-121976354-A

Abstract

The invention discloses a super-soft and high-bulk melt-blown thermal insulation wadding which is prepared by carrying out air flow drafting, layering and low-temperature shaping on composite melt-blown fibers, wherein the raw material components of the composite melt-blown fibers comprise, by weight, 10% -15% of modified polylactic acid elastomer, 10% -20% of polyester staple fibers, 65% -75% of polypropylene melt-blown fibers, 1% -3% of antistatic modifier and 0.5% -2% of softener. The invention also discloses a preparation method of the melt-blown thermal insulation flocculus, which has the advantages of simple production process, easily obtained formula raw materials and high production efficiency, and the prepared thermal insulation flocculus has better thermal insulation performance, has low carbon, environment friendliness and excellent comprehensive performance such as good compression rebound resilience, water resistance, moisture absorption resistance, no agglomeration after washing, no reduction of thermal insulation effect after outdoor water spraying, and has very wide application prospect compared with the traditional thermal insulation materials such as down, cotton-like chemical fiber and the like.

Inventors

  • CHEN BINGSHAN
  • YUAN BAOZHONG

Assignees

  • 山东华诚高科材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (9)

  1. 1. A super-soft high-fluffiness melt-blown thermal insulation wadding is characterized by being prepared by air-flow drafting, layering and shaping of composite melt-blown fibers, wherein the raw material components of the composite melt-blown fibers comprise, by weight, 10% -15% of modified polylactic acid elastomer, 10% -20% of polyester staple fibers, 65% -75% of polypropylene melt-blown fibers, 1% -3% of antistatic modifier and 0.5% -2% of softener.
  2. 2. The ultra-soft high bulk melt blown thermal insulation batt of claim 1, wherein the fineness of the composite melt blown fiber is 0.8-2.5dtex and the fiber length is 25-45mm.
  3. 3. The super-soft high-bulk melt-blown thermal insulation flocculus according to claim 1, wherein the modified polylactic acid elastomer is prepared by blending and modifying polylactic acid, thermoplastic polyurethane elastomer and a compatilizer according to a weight ratio of 90:8:2, the elongation at break is more than or equal to 300%, the hollowness of the polyester staple fiber is 30% -45%, and the length range is 38-55mm.
  4. 4. The ultra-soft high-bulk melt-blown thermal insulation flocculus of claim 1, wherein the antistatic modifier is a composite system of a quaternary ammonium salt type cationic antistatic agent and nano tin antimony oxide, and the weight ratio of the quaternary ammonium salt type cationic antistatic agent to the nano tin antimony oxide is 7:3.
  5. 5. The super soft high bulk melt blown thermal insulation wadding according to claim 4, wherein the quaternary ammonium salt type cationic antistatic agent is cetyl trimethyl ammonium chloride, and the particle size of the nano tin antimony oxide is 50-100nm.
  6. 6. A method of making the ultra-soft high loft meltblown thermal batting according to any one of claims 1-5, comprising the steps of: (1) Mixing the modified polylactic acid elastomer, the low-melting point polypropylene, the superfine hollow polyester staple fibers, the antistatic modifier and the softening agent in proportion, putting into a high-speed mixer, and mixing for 15-20min at 80-90 ℃ and the rotating speed of 300-400r/min to obtain uniform mixed raw materials; (2) Feeding the mixed raw materials into a screw extruder, setting the temperature of each section of the screw to 160-170 ℃, 180-190 ℃ in a compression section and 200-210 ℃ in a metering section in sequence, filtering impurities through a melt filter after melt plasticization, and accurately metering and conveying the filtered impurities to a melt blowing die head through a metering pump; (3) Air flow drafting, namely forming superfine fibers by melt trickles extruded from spinneret orifices of a melt blowing die head under the drafting action of high-speed hot air at two sides, wherein the temperature of the hot air is 220-240 ℃ and the air speed is 350-450m/min; (4) Layering and forming a net, namely uniformly spreading the cooled and shaped fibers on a grounded conductive metal net curtain through an airflow net spreading device by adopting a multi-layer net spreading process, wherein the gram weight of a single-layer fiber net is controlled to be 10-15g/m 2 , and the number of superimposed layers is 4-6; (5) And (3) low-temperature shaping, namely feeding the multi-layer overlapped fiber web into a shaping machine, shaping for 3-5min at 145-155 ℃ and under the pressure of 0.1-0.3MPa, realizing light bonding among fibers, and naturally cooling to room temperature after shaping to obtain the ultra-soft high-fluffiness melt-blown thermal insulation flocculus.
  7. 7. The method according to claim 6, wherein the melt-blown receiving distance of the air-laying device in the step (4) is 25-35cm, and a negative pressure suction device is arranged below the conductive metal mesh curtain, and the negative pressure wind pressure is 0.8-1.2Pa.
  8. 8. The method according to claim 6, wherein the surface carding treatment is further carried out after the shaping in the step (5), and the surface of the flakes is lightly carded by a carding roller with the rotating speed of 50-80r/min.
  9. 9. The ultra-soft high-bulk melt-blown thermal insulation wadding prepared by the preparation method of any one of claims 6 to 8, wherein the gram weight is 50 to 150g/m 2 , the thickness is 5 to 15mm, the thermal insulation Crohn value is more than or equal to 2.5clo, the breaking stress is more than or equal to 1800Pa, and the thermal conductivity coefficient is less than or equal to 22.10 mW/m.K.

Description

Super-soft high-fluffiness melt-blown thermal insulation flocculus and preparation method thereof Technical Field The invention belongs to the technical field of novel thermal insulation materials, and relates to super-soft high-fluffiness melt-blown thermal insulation cotton and a preparation method thereof. Background Whether winter dress keeps warm in severe winter depends on the performance of inside filler. Winter clothing made of soft and fluffy materials can effectively prevent heat loss and effectively block cold winter wind. Down is soft and highly fleeting compared to other popular outdoor materials, however, it performs poorly in humid environments, and raw materials are costly to obtain and the way to obtain is not humane. Many companies are currently striving to design soft and fluffy thermal materials that replace down, which perform similar to warm down, but perform better than down in a wet environment, and with lower raw material costs. In addition, compared with the traditional thermal insulation materials, such as thermal insulation clothes made of cotton, wool, artificial cotton and other fabrics, the novel thermal insulation material is relatively low in price, water-repellent, moisture-proof, light and thermal, and is more suitable for outdoor activities. The winter is a good season in one year, and the clothes are light and flexible to wear, have better warm keeping performance, and can lead us to spend better time outdoors. The air isolation layer is formed by short fibers with different fineness, but most of fiber materials are not enough in strength and flexibility or are soft and insufficient in strength, so that the fluffiness is small, and the thermal insulation cotton has a certain thermal insulation function in a cold environment, but is poor in wearing comfort and hand feeling. Accordingly, in the art, it is desirable to develop a melt blown thermal cotton having ultra-soft, high bulk by melt blown fiber compounding. Disclosure of Invention Aiming at the problems existing in the prior art, the invention aims to provide an ultra-soft high-fluffiness melt-blown thermal insulation wadding and a preparation method thereof. The invention adopts the following technical scheme: The super soft high-fluffiness melt-blown thermal insulation wadding is prepared by air-flow drafting, layering and shaping composite melt-blown fibers, wherein the composite melt-blown fibers comprise, by weight, 10% -15% of modified polylactic acid elastomer, 10% -20% of polyester staple fiber, 68% -80% of polypropylene melt-blown fiber, 1% -3% of antistatic modifier and 0.5% -2% of softener. The fineness of the composite melt-blown fiber is 0.8-2.5dtex, and the fiber length is 25-45mm. In the invention, the polypropylene melt-blown fiber, the polyester staple fiber and the modified polylactic acid elastomer are mutually wound and combined in the melt-blown thermal insulation flocculus, the polypropylene melt-blown material provides a good thermal insulation effect, the polyester staple fiber provides a skeleton supporting effect in a three-dimensional structure, and the functional fiber greatly improves the flexibility of the material, so that the thermal insulation flocculus has good light flexibility, high degree of covering and thermal insulation effect, safety and environmental protection. In some embodiments, the modified polylactic acid elastomer content is 10% -15%, e.g., 10%, 11%, 12%, 13%, 14%, 15%, the polyester staple fiber content is 10% -20%, e.g., 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%, and the polyacrylic acid fiber content is 65% -79%, e.g., 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%. In some embodiments, the melt blown thermal batt has a grammage of 60-150g/m 2, such as 60g/m2、65g/m2、70g/m2、75g/m2、80g/m2、85g/m2、90g/m2、100g/m2、110g/m2、120g/m2、130g/m2、140g/m2 or 150g/m 2. In the invention, the content of the polypropylene material in the melt-blown thermal insulation flocculus is calculated by taking the total weight of the melt-blown thermal insulation flocculus as 100%, and the prepared base material is polypropylene melt-blown fiber. Further, the modified polylactic acid elastomer is prepared by blending and modifying polylactic acid, thermoplastic polyurethane elastomer and epoxidized soybean oil according to the weight ratio of 90:8:2, the elongation at break is more than or equal to 300 percent, and the softness and rebound resilience of the fiber are improved by introducing the elastomer, so that the collapse of the flocculus after long-term compression is avoided. The average molecular weight of the polylactic acid is 8-10 ten thousand. The antistatic modifier is a composite system of a quaternary ammonium salt type cationic antistatic agent and nano tin antimony oxide (ATO), the weight ratio of the quaternary ammonium salt type cationic antistatic agent to the nano tin antimony oxide (ATO) is 7:3, wherein the quaternary ammonium salt