Preparation method of milk down fibers

Abstract

A preparation method of milk down fibers is a textile material technology, solves the defects of the prior art, and adopts the technical scheme as follows: raw material preparation: mixing milk protein, polyvinyl alcohol and chitosan according to a certain proportion, adding deionized water, and uniformly stirring to prepare a spinning solution; spinning: filtering and defoaming the spinning solution, and spinning by adopting an electrostatic spinning technology to obtain nascent fibers; curing: immersing the nascent fiber into a curing liquid, and carrying out cross-linking curing treatment to obtain a cured fiber; washing: repeatedly washing the cured fiber with deionized water to remove the residual curing liquid; drying: drying the washed fibers to obtain milk down fibers; the preparation method has the beneficial effects that the electrostatic spinning technology is adopted, the process is simple, energy consumption is low, and environmental pollution is small; the chitosan is added, so that the antibacterial property and the biocompatibility of the fiber are improved; the prepared milk down fiber has excellent softness, skin-friendly property, air permeability and heat retention property, and can be widely applied to the fields of clothes, home textiles and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of textile materials, and particularly relates to a preparation method of milk velvet fiber. Background Art

[0002] With the improvement of people's living standards, higher requirements are put forward for the comfort, functionality and environmental protection of textiles. As a new type of environmental protection fiber, milk velvet fiber has received extensive attention in recent years due to its excellent properties such as softness, skin-friendly, breathability and warmth retention.

[0003] At present, the preparation methods of milk velvet fiber mainly include wet spinning and dry spinning. Wet spinning is to dissolve milk protein in an alkaline solution, then extrude it through a spinneret hole, solidify and form it in an acidic coagulation bath, and then make fibers through processes such as stretching and drying. The wet spinning process is complex, energy-consuming, has a large environmental pollution, and the fiber strength is relatively low. Dry spinning is to blend milk protein with a fiber-forming high polymer such as polyvinyl alcohol and make fibers through melt spinning or solution spinning. Although the dry spinning process is simple, the fiber strength is low, the hand feeling is poor, and it is difficult to achieve a high content addition of milk protein.

[0004] In order to overcome the deficiencies of the prior art, researchers have carried out a lot of explorations. For example, Chinese Patent CN102660800A discloses a preparation method of milk protein fiber, which adopts the wet spinning process and improves the fiber strength by adding a cross-linking agent. However, this method still has problems such as complex process, high energy consumption and large environmental pollution. Chinese Patent CN103205758A discloses a preparation method of milk protein / polyvinyl alcohol composite fiber, which adopts the dry spinning process and improves the fiber strength by adding nano materials. However, the fibers prepared by this method have a poor hand feeling and it is difficult to achieve a high content addition of milk protein.

[0005] In summary, it is of great significance to develop a method with simple process, low energy consumption, small environmental pollution and capable of preparing high-performance milk velvet fiber. Summary of the Invention

[0006] The present invention aims to provide a preparation method of milk velvet fiber to solve the above problems existing in the prior art.

[0007] The technical solution of the present invention is as follows: Raw material preparation: Mix milk protein, polyvinyl alcohol and chitosan in a certain proportion, add deionized water, and stir evenly to make a spinning dope.

[0008] Spinning: After filtering and degassing the spinning dope, use electrospinning technology for spinning to obtain primary fibers.

[0009] Curing: Immerse the primary fibers in a curing solution and carry out cross-linking curing treatment to obtain cured fibers.

[0010] Washing: Repeatedly wash the solidified fibers with deionized water to remove the residual solidifying solution.

[0011] Drying: Dry the washed fibers to obtain milk fluff fibers.

[0012] Advantages of the present invention: 1. The present invention adopts the electrospinning technology, with simple process, low energy consumption and little environmental pollution; 2. By adding chitosan, the antibacterial property and biocompatibility of the fibers are improved; 3. The milk fluff fibers prepared by the present invention have excellent softness, skin-friendly property, air permeability and warmth retention, and can be widely applied to the fields of clothing, home textiles, etc. Specific embodiments

[0013] The present invention will be further described in detail below with reference to the embodiments.

[0014] Embodiment 1: The production steps of the present invention are as follows: The first step is raw material preparation, mixing 10 - 20 wt% milk protein, 5 - 11 wt% polyvinyl alcohol, and 1 - 3 wt% chitosan, adding 75 - 93 wt% deionized water, and stirring evenly to prepare a spinning dope; The second step is spinning, after filtering and degassing the spinning dope, adopting the electrospinning technology for spinning, with a spinning voltage of 15 - 25 kV and a receiving distance of 10 - 20 cm to obtain primary fibers; The third step is solidification, immersing the primary fibers in a 3 - 7 wt% glutaraldehyde solution for crosslinking and solidification treatment for 30 - 90 minutes to obtain solidified fibers; The fourth step is washing, repeatedly washing the solidified fibers with deionized water 1 - 5 times to remove the residual glutaraldehyde solution; The fifth step is drying, drying the washed fibers at 50 - 70 °C for 1 - 3 hours to obtain milk fluff fibers.

[0015] Embodiment 2: The production steps of the present invention are as follows: The first step is raw material preparation, mixing 15 wt% milk protein, 8 wt% polyvinyl alcohol, and 2 wt% chitosan, adding 84 wt% deionized water, and stirring evenly to prepare a spinning dope; The second step is spinning, after filtering and degassing the spinning dope, adopting the electrospinning technology for spinning, with a spinning voltage of 20 kV and a receiving distance of 15 cm to obtain primary fibers; The third step is solidification, immersing the primary fibers in a 5 wt% glutaraldehyde solution for crosslinking and solidification treatment for 60 minutes to obtain solidified fibers; The fourth step is washing, repeatedly washing the solidified fibers with deionized water 3 times to remove the residual glutaraldehyde solution; The fifth step is drying, drying the washed fibers at 60 °C for 2 hours to obtain milk fluff fibers.

[0016] Comparative Example 1: Prepare milk fluff fibers according to the method of Embodiment 1, but without adding chitosan.

[0017] Comparative Example 2: Prepare milk fluff fibers according to the method of Embodiment 2, but without adding chitosan.

[0018] Performance test: The performance of the milk velvet fibers prepared in Example 1, Example 2, Comparative Example 1 and Comparative Example 2 was tested, and the results are shown in the following table: | Sample | Fiber diameter (μm) | Breaking strength (cN / dtex) | Antibacterial rate (%) | | Example 1 | 1.5 | 2.5 | 95 | | Example 2 | 2.0 | 3.0 | 98 | | Comparative Example 1 | 1.5 | 2.0 | 60 | | Comparative Example 2 | 2.0 | 2.5 | 65 | It can be seen from the table that the milk velvet fibers prepared in Example 1 and Example 2 of the present invention have finer fiber diameters, higher breaking strengths and antibacterial rates, indicating that the performance of the milk velvet fibers is effectively improved by adding chitosan in the present invention.

Claims

1. A preparation method of milk velvet fiber, characterized in that: The method comprises the following production steps: a first step of raw material preparation, wherein 10-20 wt% of milk protein, 5-11 wt% of polyvinyl alcohol, and 1-3 wt% of chitosan are mixed, 75-93 wt% of deionized water are added, and the mixture is stirred evenly to prepare a spinning solution; a second step of spinning, wherein the spinning solution is filtered and degassed, and then electrostatic spinning technology is used to spin the fibers at a spinning voltage of 15-25 kV and a receiving distance of 10-20 cm to obtain nascent fibers; and a third step of curing, wherein the nascent fibers are immersed in a 3-7 wt% glutaraldehyde solution and cross-linked and cured for 30-90 minutes to obtain cured fibers. The fourth step is washing, repeatedly washing the cured fiber with deionized water for 1-5 times to remove the residual glutaraldehyde solution; the fifth step is drying, drying the washed fiber at 50-70° C. for 1-3 hours to obtain milk cashmere fiber.

2. The method for preparing milk cashmere fiber according to claim 1, wherein: The method is completed by the following production steps: the first step is raw material preparation, which involves mixing 15wt% milk protein, 8wt% polyvinyl alcohol, and 2wt% chitosan, adding 84wt% deionized water, and stirring evenly to prepare a spinning solution; the second step is spinning, which involves filtering and degassing the spinning solution, and then spinning it using electrospinning technology at a spinning voltage of 20kV and a receiving distance of 15cm to obtain nascent fibers; The third step is curing, where the as-spun fibers are immersed in a 5 wt% glutaraldehyde solution and cross-linked for 60 minutes to obtain cured fibers. The fourth step is washing, repeatedly washing the cured fiber with deionized water for 3 times to remove the residual glutaraldehyde solution; the fifth step is drying, drying the washed fiber at 60° C. for 2 hours to obtain milk cashmere fiber.