WO2021037145A1 - 一种电子烟用过滤嘴的制备方法 - Google Patents

一种电子烟用过滤嘴的制备方法 Download PDF

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WO2021037145A1
WO2021037145A1 PCT/CN2020/111768 CN2020111768W WO2021037145A1 WO 2021037145 A1 WO2021037145 A1 WO 2021037145A1 CN 2020111768 W CN2020111768 W CN 2020111768W WO 2021037145 A1 WO2021037145 A1 WO 2021037145A1
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lactic acid
preparing
filter tip
filter
polylactic acid
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PCT/CN2020/111768
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English (en)
French (fr)
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卢集伟
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深圳市智叶科技有限公司
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Publication of WO2021037145A1 publication Critical patent/WO2021037145A1/zh

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0229—Filter rod forming processes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • This application relates to the field of electronic cigarette filtration, and in particular to a method for preparing a filter tip for electronic cigarettes.
  • E-cigarettes extract corresponding substances from tobacco, supplement them with other auxiliary materials to prepare e-liquid, and form smoke through rapid heating and atomization technology to satisfy consumers' experience.
  • polylactic acid fiber tow is significantly better than polypropylene fiber and slightly inferior to cellulose acetate fiber, but it has good adsorption and absorption capacity for aromatic and non-polar substances represented by toluene. Obviously better than cellulose acetate fiber.
  • the tow of polylactic acid fiber can be used as a filter material for tobacco, and polylactic acid is recognized as a green and environmentally friendly biodegradable material with higher safety.
  • the purpose of the present application is to provide a method for preparing a filter tip for electronic cigarettes, so as to solve the above-mentioned problems in the background art.
  • a method for preparing a filter tip for electronic cigarettes includes the following steps:
  • S1 Dry the polylactic acid raw material under vacuum at 60-80°C for 10-12h; prepare the first fiber web with a thickness of 0.5-1mm and a width of 50-200mm through a melt-blown process; and use a sniffer to remove the first fiber web Push the bell mouth of 120-150°C and wrap it with roll paper, and then cut it into solid mouth stick of corresponding size;
  • the preparation method of the polylactic acid raw material in the step S1 includes the following steps:
  • step S12 adding the oligomer obtained in step S11 to the depolymerization reactor, and adding a depolymerization catalyst to the inside to prepare a gas phase rich in lactic acid and a liquid phase rich in oligomer;
  • step S13 Condensate the gas phase obtained in step S12 to obtain liquid crude lactic acid;
  • step S14 extracting and crystallizing the liquid crude lactic acid obtained in step S13, separating and removing the crystals to obtain a mixture containing lactic acid crystals, drying the mixture to obtain pre-purified lactic acid, and crystallizing the pre-purified lactic acid to obtain purified lactic acid;
  • step S15 polymerizing the purified lactic acid in step S14 to obtain the polylactic acid raw material.
  • the acidity of the purified lactic acid is less than 20 meq/kg, the water content is less than 220 ppm, and the meso-lactic acid content is less than 1.5%.
  • the filter tip for electronic cigarettes includes tows assembled by polylactic acid fibers.
  • the shape of the filter tip for electronic cigarettes is a solid cylindrical shape and a hollow cylindrical shape.
  • the size of the solid cylindrical filter tip is D14-8mm in diameter and 41-45mm in length L1.
  • the size of the hollow cylindrical filter tip is an outer diameter D24-8mm, an inner diameter d1-4mm, and a length L2 41-45mm.
  • the weight of the filter rod is 0.45-1.5g/piece.
  • the monofilament specification of the first fiber web is 1-10 dtex
  • the monofilament specification of the second fiber web is 1-10 dtex
  • the melt index of the polylactic acid is 50 ⁇ 120g/10min (210°C, 2.16kg).
  • the present application also provides a filter for electronic cigarettes, wherein the filter for electronic cigarettes is manufactured by using the method for preparing a filter for electronic cigarettes as described above.
  • the technical solution of the present application uses a filter to completely isolate the oily substance from contacting the oral cavity, prevent the fried oil from entering the oral cavity, can intercept other harmful substances in the smoke, and can also restore the smoking sensation of smoking traditional cigarettes.
  • the filter adopts the completely biodegradable polylactic acid material to prepare the corresponding filter, which has excellent processing performance and can be fully adapted to the existing melt-blown spinning production process. The process is simple and is conducive to industrial production.
  • Figure 1 is a schematic diagram of a cylindrical filter tip
  • Figure 2 is a schematic diagram of a hollow cylindrical filter.
  • a method for preparing a filter tip for electronic cigarettes includes the following steps:
  • the preparation method of polylactic acid raw material includes the following steps:
  • step S12 adding the oligomer obtained in step S11 to the depolymerization reactor, and adding a depolymerization catalyst to the inside to prepare a gas phase rich in lactic acid and a liquid phase rich in oligomer;
  • step S13 Condensate the gas phase obtained in step S12 to obtain liquid crude lactic acid;
  • step S14 The liquid crude lactic acid obtained in step S13 is extracted and crystallized, separated and removed to obtain a mixture containing lactic acid crystals, the mixture is dried to obtain pre-purified lactic acid, and the pre-purified lactic acid is crystallized to obtain an acidity of 20 meq/kg, water Purified lactic acid with a content of 220 ppm and a meso-lactic acid content of 1.5%;
  • step S15 The purified lactic acid in step S14 is polymerized to obtain a polylactic acid raw material.
  • a method for preparing a filter tip for electronic cigarettes includes the following steps:
  • the preparation method of polylactic acid raw material includes the following steps:
  • step S12 adding the oligomer obtained in step S11 to the depolymerization reactor, and adding a depolymerization catalyst to the inside to prepare a gas phase rich in lactic acid and a liquid phase rich in oligomer;
  • step S13 Condensate the gas phase obtained in step S12 to obtain liquid crude lactic acid;
  • step S14 The liquid crude lactic acid obtained in step S13 is extracted and crystallized, separated and removed to obtain a mixture containing lactic acid crystals, the mixture is dried to obtain pre-purified lactic acid, and the pre-purified lactic acid is crystallized to obtain an acidity of 10 meq/kg, water Purified lactic acid with a content of 200 ppm and a meso-lactic acid content of 1%;
  • step S15 The purified lactic acid in step S14 is polymerized to obtain a polylactic acid raw material.
  • a method for preparing a filter tip for electronic cigarettes includes the following steps:
  • a second fiber web with a thickness of 0.8mm and a width of 130mm is prepared through a melt-blown process.
  • the second fiber web has a thickness of 0.8mm and a width of 130mm.
  • the specification of the fiber web is 6dtex; then the second fiber web is wound on a stainless steel rod with an outer diameter of D23mm and shaped by hot air. After wrapping the paper roll, remove and cut the hollow filter of the corresponding size.
  • the solid cylindrical filter has a size of Diameter D16mm, length L1 44mm; the size of the hollow cylindrical filter tip is outer diameter D27mm, inner diameter d3mm, and length L2 44mm.
  • the weight of the filter tip is 1.2g/piece.
  • the preparation method of polylactic acid raw material includes the following steps:
  • step S12 adding the oligomer obtained in step S11 to the depolymerization reactor, and adding a depolymerization catalyst to the inside to prepare a gas phase rich in lactic acid and a liquid phase rich in oligomer;
  • step S13 Condensate the gas phase obtained in step S12 to obtain liquid crude lactic acid;
  • step S14 The liquid crude lactic acid obtained in step S13 is extracted and crystallized, separated and removed to obtain a mixture containing lactic acid crystals, the mixture is dried to obtain pre-purified lactic acid, and the pre-purified lactic acid is crystallized to obtain an acidity of 10 meq/kg, water Purified lactic acid with a content of 200 ppm and a meso-lactic acid content of 0.8%;
  • step S15 The purified lactic acid in step S14 is polymerized to obtain a polylactic acid raw material.
  • a method for preparing a filter tip for electronic cigarettes includes the following steps:
  • the preparation method of polylactic acid raw material includes the following steps:
  • step S12 adding the oligomer obtained in step S11 to the depolymerization reactor, and adding a depolymerization catalyst to the inside to prepare a gas phase rich in lactic acid and a liquid phase rich in oligomer;
  • step S13 Condensate the gas phase obtained in step S12 to obtain liquid crude lactic acid;
  • step S14 The liquid crude lactic acid obtained in step S13 is extracted and crystallized, separated and removed to obtain a mixture containing lactic acid crystals, the mixture is dried to obtain pre-purified lactic acid, and the pre-purified lactic acid is crystallized to obtain an acidity of 5 meq/kg, water Purified lactic acid with a content of 180 ppm and a meso-lactic acid content of 0.5%;
  • step S15 The purified lactic acid in step S14 is polymerized to obtain a polylactic acid raw material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

一种电子烟用过滤嘴的制备方法，包括以下步骤：将聚乳酸原材料抽真空干燥，经过熔喷工艺制备出第一纤维网，利用吸枪将第一纤维网推送过喇叭口经卷纸包覆再切割成相应尺寸的实心嘴棒；将聚乳酸原材料抽真空干燥，经过熔喷工艺制备出第二纤维网，然后将第二纤维网卷绕于外径D2的不锈钢棒材上经热风定型，包覆卷纸后取下裁切成相应尺寸的过滤嘴。

Description

一种电子烟用过滤嘴的制备方法
相关申请的交叉引用
本申请要求于2019年8月28日提交中国专利局、申请号为201910801908.5、申请名称为“一种电子烟用过滤嘴及其制备方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电子烟过滤领域，具体是一种电子烟用过滤嘴的制备方法。
 背景技术
传统的烟草产品在烟草燃烧过程中产生大量的烟焦油、不充分燃烧物等几百种对人体有毒有害的物质，进一步加大了对人体健康的损害。
为了降低烟草对广大烟民消费者的健康损害，烟草行业也在不断的推陈出新，推出了各种香烟产品，如细支烟、超细支烟、传统电子烟、低温不燃烧烟等等，传统电子烟是从烟草中提取相应物质，辅助以其他的辅料配制成烟油，通过极速加热雾化技术形成烟雾来满足消费者的体验。
现有技术中，传统电子烟由于吸食导致烟气的移动速度极快，无法避免的导致微量油状微珠会随着烟气移动，随着吸食次数的增加吸食部位集聚油状物，极大地破坏了口感体验且增加了心理负担；同时少量水汽也会在气道壁上凝结成微珠，当温度高的油状微滴遇到微量的水，会有轻微的油炸声，严重时油滴会直接炸进口腔，带来安全隐患。
据研究表明，聚乳酸纤维丝束的过滤吸附效果明显优于聚丙烯纤维，略逊于醋酸纤维素纤维，但对以甲苯为代表的芳香和非极性物质具有很好的吸附吸收能力，而且明显优于醋酸纤维素纤维，理论上聚乳酸纤维丝束完全可作为烟草的过滤材料，而且聚乳酸是公认的绿色环保可生物降解材料，具有更高的安全性。
 技术解决方案
本申请的目的在于提供一种电子烟用过滤嘴的制备方法，以解决上述背景技术中提出的问题。
为实现上述目的，本申请提供如下技术方案：
一种电子烟用过滤嘴的制备方法，所述电子烟用过滤嘴的制备方法包括以下步骤：
S1：将聚乳酸原材料在60-80℃下用抽真空干燥10-12h；经过熔喷工艺制备出厚0.5-1mm、宽幅50-200mm第一纤维网；以及利用吸枪将第一纤维网推送过120-150℃的喇叭口经卷纸包覆，再切割成相应尺寸的实心嘴棒；
S2：将所述聚乳酸原材料在60-80℃下用抽真空干燥10-12h；经过熔喷工艺制备出厚0.5-1mm、宽幅125-183mm第二纤维网；以及将第二纤维网卷绕于外径D21-4mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的中空过滤嘴。
在一实施例中：所述步骤S1中所述聚乳酸原材料制备方法包括以下步骤：
S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为900-2000、总酸度等价酸度110%-140%、光学纯度相当于85%-120%L-聚乳酸的低聚体；
S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到纯化乳酸；
S15：对步骤S14中的纯化乳酸进行聚合，得到所述聚乳酸原材料。
在一实施例中：所述纯化乳酸的酸度低于20meq/kg、水含量低于220ppm，且meso-乳酸含量低于1.5%。
在一实施例中：所述电子烟用过滤嘴包括聚乳酸纤维集合而成的丝束。
在一实施例中：所述电子烟用过滤嘴的形状为实心圆柱形和中空圆柱形。
在一实施例中：所述实心圆柱形过滤嘴尺寸为直径D14-8mm、长度L1 41-45mm。
在一实施例中：所述中空圆柱形过滤嘴尺寸为外径D24-8mm、内径d1-4mm、长度L2 41-45mm。
在一实施例中：所述过滤嘴棒克重为0.45-1.5g/支。
在一实施例中：所述第一纤维网单丝规格为1-10dtex，所述第二纤维网的单丝规格为1-10dtex。
在一实施例中：所述聚乳酸的熔融指数为50~120g/10min（210℃、2.16kg）。
本申请还提供一种电子烟用过滤嘴，其中，所述电子烟用过滤是采用如上所述的电子烟用过滤嘴的制备方法制作的。
与现有技术相比，本申请的有益效果是：
本申请技术方案采用过滤嘴可以完全隔绝油状物与口腔的接触，阻挡炸油进入口腔，可截留烟气中其它的有害物质，还可还原吸食传统卷烟的吸食感觉。过滤嘴采用可完全生物降解的聚乳酸材料制备相应的过滤嘴，加工性能优异，完全可以适应现有的熔喷纺丝生产工艺生产，工艺简单，利于工业化生产。
 附图说明
图1为圆柱形过滤嘴的示意图；
图2为中空圆柱形过滤嘴的示意图。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
实施例一：
一种电子烟用过滤嘴的制备方法，电子烟用过滤嘴的制备方法包括以下步骤：
S1：将50g/10min（210℃、2.16kg）的聚乳酸原材料在60℃下用抽真空干燥10h；经过熔喷工艺制备出厚0.5mm、宽幅50mm第一纤维网，其中，第一纤维网规格为1dtex；利用吸枪快速将第一纤维网推送过120℃的喇叭口经卷纸包覆，再切割成相应尺寸的实心嘴棒；
S2：将50g/10min（210℃、2.16kg）的聚乳酸原材料在60℃下用抽真空干燥10h；经过熔喷工艺制备出厚0.5mm、宽幅125mm第二纤维网，其中，第二纤维网规格为1dtex；然后将纤维网卷绕于外径D21mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的中空过滤嘴，其中，实心圆柱形过滤嘴尺寸为直径D14mm、长度L1 41mm；中空圆柱形过滤嘴尺寸为外径D24mm、内径d1mm、长度L2 41mm，过滤嘴棒克重为0.45g/支。
聚乳酸原材料的制备方法包括以下步骤：
S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为900、总酸度等价酸度110%、光学纯度相当于85%L-聚乳酸的低聚体；
S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到酸度20meq/kg、水含量220ppm，且meso-乳酸含量1.5%的纯化乳酸；
S15：对步骤S14中的纯化乳酸进行聚合即可得聚乳酸原材料。
实施例二：
一种电子烟用过滤嘴的制备方法，电子烟用过滤嘴的制备方法包括以下步骤：
S1：将70g/10min（210℃、2.16kg）的聚乳酸原材料在70℃下用抽真空干燥11h；经过熔喷工艺制备出厚0.8mm、宽幅100mm第一纤维网，其中，第一纤维网规格为5dtex；利用吸枪快速将第一纤维网推送过130℃的喇叭口经卷纸包覆，再切割成相应尺寸的实心嘴棒；
S2：将70g/10min（210℃、2.16kg）的聚乳酸原材料在70℃下用抽真空干燥11h；经过熔喷工艺制备出厚0.8mm、宽幅140mm第二纤维网，其中，第二纤维网规格为5dtex；然后将第二纤维网卷绕于外径D22mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的中空过滤嘴，其中，实心圆柱形过滤嘴尺寸为直径D16mm、长度L1 43mm；中空圆柱形过滤嘴尺寸为外径D26mm、内径d3mm、长度L1 43mm，过滤嘴的棒克重为1g/支。
聚乳酸原材料制备方法包括以下步骤：
S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为1200、总酸度等价酸度120%、光学纯度相当于95%L-聚乳酸的低聚体；
S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到酸度10meq/kg、水含量200ppm，且meso-乳酸含量1%的纯化乳酸；
S15：对步骤S14中的纯化乳酸进行聚合即可得聚乳酸原材料。
实施例三：
一种电子烟用过滤嘴的制备方法，电子烟用过滤嘴的制备方法包括以下步骤：
S1：将100g/10min（210℃、2.16kg）的聚乳酸原材料在80℃下用抽真空干燥12h；经过熔喷工艺制备出厚0.8mm、宽幅150mm第一纤维网，其中，纤维网规格为6dtex；利用吸枪快速将第一纤维网推送过140℃的喇叭口经卷纸包覆再切割成相应尺寸的实心嘴棒；
S2：将将100g/10min（210℃、2.16kg）的聚乳酸原材料在80℃下用抽真空干燥12h；经过熔喷工艺制备出厚0.8mm、宽幅130mm第二纤维网，其中，第二纤维网规格为6dtex；然后将第二纤维网卷绕于外径D23mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的中空过滤嘴，其中，实心圆柱形过滤嘴尺寸为直径D16mm、长度L1 44mm；中空圆柱形过滤嘴尺寸为外径D27mm、内径d3mm，长度L2 44mm，过滤嘴的棒克重为1.2g/支。
聚乳酸原材料制备方法包括以下步骤：
S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为1500、总酸度等价酸度130%、光学纯度相当于110%L-聚乳酸的低聚体；
S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到酸度10meq/kg、水含量200ppm，且meso-乳酸含量0.8%的纯化乳酸；
S15：对步骤S14中的纯化乳酸进行聚合即可得聚乳酸原材料。
实施例四：
一种电子烟用过滤嘴的制备方法，电子烟用过滤嘴的制备方法包括以下步骤：
S1：将120g/10min（210℃、2.16kg）的聚乳酸原材料在80℃下用抽真空干燥12h；经过熔喷工艺制备出厚1mm、宽幅200mm第一纤维网，其中，第一纤维网规格为10dtex；利用吸枪快速将第一纤维网推送过150℃的喇叭口经卷纸包覆，再切割成相应尺寸的实心嘴棒；
S2：将120g/10min（210℃、2.16kg）的聚乳酸原材料在80℃下用抽真空干燥12h；经过熔喷工艺制备出厚1mm、宽幅183mm第二纤维网，其中，第二纤维网规格为10dtex；然后将第二纤维网卷绕于外径D24mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的中空过滤嘴，其中，实心圆柱形过滤嘴尺寸为直径D18mm、长度L1 45mm；中空圆柱形过滤嘴尺寸为外径D28mm、内径d4mm、长度L2 45mm，过滤嘴棒克重为1.5g/支。
聚乳酸原材料制备方法包括以下步骤：
S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为2000、总酸度等价酸度140%、光学纯度相当于120%L-聚乳酸的低聚体；
S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到酸度5meq/kg、水含量180ppm，且meso-乳酸含量0.5%的纯化乳酸；
S15：对步骤S14中的纯化乳酸进行聚合即可得聚乳酸原材料。
尽管参照前述实施例对本申请进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，和者对其中部分技术特征进行等同替换，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (9)

  1. 一种电子烟用过滤嘴的制备方法，其中：所述电子烟用过滤嘴的制备方法包括以下步骤：
    S1：将聚乳酸原材料在60-80℃下用抽真空干燥10-12h；经过熔喷工艺制备出厚0.5-1mm、宽幅50-200mm的第一纤维网；利用吸枪将所述第一纤维网推送过120-150℃的喇叭口经卷纸包覆，再切割成相应尺寸的实心嘴棒；
    S2：将所述聚乳酸原材料在60-80℃下用抽真空干燥10-12h；经过熔喷工艺制备出厚0.5-1mm、宽幅125-183mm第二纤维网；以及将所述第二纤维网卷绕于外径D21-4mm的不锈钢棒材上经热风定型，包覆卷纸后取下裁切相应尺寸的空心过滤嘴。
  2. 根据权利要求1所述的一种电子烟用过滤嘴的制备方法，其中：所述步骤S1中所述聚乳酸原材料制备方法包括以下步骤：
    S11：乳酸和乳酸衍生物溶液添加至容器内，对其进行蒸发制备成分子量为900-2000、总酸度等价酸度110%-140%、光学纯度相当于85%-120%L-聚乳酸的低聚体；
    S12：将步骤S11得到的低聚体加入到解聚反应器内，并向其内部添加解聚催化剂，制备得到富含乳酸的气相和富含低聚体的液相；
    S13：对步骤S12制得的气相进冷凝处理得到液态粗乳酸；
    S14：将步骤S13得到的液态粗乳酸进行抽取结晶、分离和排除晶体得到含乳酸晶体的混合物，对所述混合物进行干燥得到预纯化乳酸，将所述预纯化乳酸结晶得到纯化乳酸；
    S15：对步骤S14中的纯化乳酸进行聚合，得到所述聚乳酸原材料。
  3. 根据权利要求2所述的一种电子烟用过滤嘴的制备方法，其中：所述纯化乳酸的酸度低于20meq/kg、水含量低于220ppm，且meso-乳酸含量低于1.5%。
  4. 根据权利要求1所述的一种电子烟用过滤嘴的制备方法，其中：所述电子烟用过滤嘴包括聚乳酸纤维集合而成的丝束。
  5. 根据权利要求1所述的一种电子烟用过滤嘴的制备方法，其中：所述电子烟用过滤嘴的形状为实心圆柱形和中空圆柱形。
  6. 根据权利要5所述的一种电子烟用过滤嘴的制备方法，其中：所述实心圆柱形的过滤嘴尺寸为直径D14-8mm、长度L1 41-45mm；所述中空圆柱形的过滤嘴尺寸为外径D24-8mm、内径d1-4mm、长度L2 41-45mm。
  7. 根据权利要5所述的一种电子烟用过滤嘴的制备方法，其中：所述过滤嘴的棒克重为0.45-1.5g/支。
  8. 根据权利要求1所述的一种电子烟用过滤嘴的制备方法，其中：所述第一纤维网的单丝规格为1-10dtex，所述第二纤维网的单丝规格为1-10dtex。
  9. 根据权利要求1所述的一种电子烟用过滤嘴的制备方法，其中：所述聚乳酸的熔融指数为50~120g/10min。
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