Soft and hydrolysis-resistant PLA (polylactic acid) fiber and preparation method thereof

The technology of polylactic acid fiber and polylactic acid, which is applied in the field of sanitary product fiber and its preparation, can solve the problems such as the decrease of mechanical strength of polylactic acid, and achieve the effects of short drying time, improved hydrophilicity and hand feeling, and improved flexibility.

Active Publication Date: 2019-08-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of hygienic material soft, hydrolysis-resistant polylactic acid fiber and its preparation method, to overcome the defect that the mechanical strength of polylactic acid in the prior art decreases. The soft and hydrolysis-resistant PLA fiber of the present invention uses polylactic acid PLA, polyethylene glycol PEG, compatibilizer MDI, and polycarbodiimide PCDI are used as raw materials to modify their properties

Method used

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  • Soft and hydrolysis-resistant PLA (polylactic acid) fiber and preparation method thereof
  • Soft and hydrolysis-resistant PLA (polylactic acid) fiber and preparation method thereof
  • Soft and hydrolysis-resistant PLA (polylactic acid) fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Preparation of PLA / PEG / MDI Composite Masterbatch

[0038] 90 parts of polylactic acid were pre-vacuum-dried at 60°C for 24 hours, then 90 parts of polylactic acid, 7 parts of polyethylene glycol and 0.4 parts of compatibilizer MDI were uniformly mixed in proportion, and added to a twin-screw extruder to granulate to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 150°C.

[0039] Step 2: Preparation of PLA / PCDI composite masterbatch

[0040] 90 parts of polylactic acid were vacuum-dried at 70°C for 12 hours in advance, then 90 parts of PLA and 0.1 part of PCDI were pre-mixed in a high-speed mixer, and granulated by a twin-screw extruder to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 150° C., and the screw speed is 180 rpm.

[0041] Step 3: Preparation of soft, hydrolysis-resistant PLA fibers

[0042] After vacuum-drying the obtained two kinds of masterbatches at 80°C for 48...

Embodiment 2

[0075] Step 1: Preparation of PLA / PEG / MDI Composite Masterbatch

[0076] Parts of polylactic acid were vacuum-dried at 60°C for 24 hours in advance, and then 92 parts of polylactic acid, 8 parts of polyethylene glycol and 0.6 parts of compatibilizer MDI were uniformly mixed in proportion, and added to a twin-screw extruder to granulate to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 160°C.

[0077] Step 2: Preparation of PLA / PCDI composite masterbatch

[0078] 94 parts of polylactic acid were vacuum-dried at 70°C for 12 hours in advance, then 94 parts of PLA and 0.2 part of PCDI were premixed in a high-speed mixer, and granulated by a twin-screw extruder to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 160° C., and the screw speed is 220 rpm.

[0079] Step 3: Preparation of soft, hydrolysis-resistant PLA fibers

[0080] After vacuum-drying the obtained two kinds of masterbatches at 80°C...

Embodiment 3

[0082] Step 1: Preparation of PLA / PEG / MDI Composite Masterbatch

[0083] 96 parts of polylactic acid were pre-vacuum-dried at 60°C for 24 hours, then 96 parts of polylactic acid, 9 parts of polyethylene glycol and 0.8 parts of compatibilizer MDI were uniformly mixed in proportion, and added to a twin-screw extruder to granulate to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 170°C.

[0084] Step 2: Preparation of PLA / PCDI composite masterbatch

[0085] 98 parts of polylactic acid were vacuum-dried at 70°C for 12 hours in advance, then 98 parts of PLA and 0.4 parts of PCDI were premixed in a high-speed mixer, and granulated by a twin-screw extruder to obtain masterbatches. Wherein, the temperature of each zone of the twin-screw extruder is 170° C., and the screw speed is 250 rpm.

[0086] Step 3: Preparation of soft, hydrolysis-resistant PLA fibers

[0087] The obtained two kinds of masterbatches were vacuum-dried at 80°C for 48 h...

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Abstract

The invention relates to soft and hydrolysis-resistant PLA (polylactic acid) fiber and a preparation method thereof. PLA is taken as a raw material and modified with polyethylene glycol and polycarbodiimide. The raw materials are blended and subjected to melt blending by a double-screw extruder, a spinning slice is prepared, the blended slice is subjected to vacuum drying, and the soft and hydrolysis-resistant PLA fiber is prepared with a melt spinning-drafting two-step method. The prepared modified PLA fiber has better softness and hydrolysis resistance, has effectively improved hydrophilcityand hand feeling and can be widely applied to the field of health materials.

Description

technical field [0001] The invention belongs to the field of hygienic fiber and its preparation, and in particular relates to a hygienic soft and hydrolysis-resistant polylactic acid fiber and a preparation method thereof. Background technique [0002] With the recovery of the global economy, changes in population structure and the popularity of disposable sanitary products, the global market for disposable sanitary products has great room for development. According to statistics, in 2016, the global market size of disposable hygiene products was about 98.1 billion US dollars. In recent years, the average annual growth rate of the industry scale has exceeded 8%, showing good growth. The huge market space has prompted global brands to expand production capacity to increase market share, especially in emerging markets such as China, where market competition continues to intensify. In this case, product innovation, health concerns and environmental protection have become key f...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10
CPCD01F1/10D01F6/92
Inventor 余木火曹珊珊张辉韩克清杨赟凡凡王凯丽陆建晓张露莎刘勇
Owner DONGHUA UNIV
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