Method for preparing regenerated cellulose short fiber by carbamate method

A technology of carbamate and regenerated cellulose, which is applied to artificial filaments made of cellulose derivatives, fiber chemical characteristics, spinning solution preparation, etc., which can solve complex process technology, increased manufacturing costs, and low fiber strength and other problems, to achieve the effect of reasonable process connection, high production rate and short production process

Active Publication Date: 2018-12-04
高密云鹰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Throughout the above patents, there are many processes in the preparation process that use alkali impregnation or liquid ammonia impregnation to remove impurities, clean the material to neutrality, heat and activate the material by microwave irradiation, and cellulose carbamate in the solution for multiple One or several of the above-mentioned processes such as primary dissolution, these result in complicated process technology, long process, low fiber strength, and difficulty in scale-up for industrial production. Large-scale transformation is required on the basis of existing traditional viscose fiber production, making The increase in manufacturing costs will also have a certain impact on the environment

Method used

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  • Method for preparing regenerated cellulose short fiber by carbamate method
  • Method for preparing regenerated cellulose short fiber by carbamate method
  • Method for preparing regenerated cellulose short fiber by carbamate method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] a. Put six batches of cotton pulp and bamboo pulp with an average degree of polymerization of 430 and a methylcellulose content of 98% in a ratio of 8:2 into the urea solution for impregnation. The urea concentration is 30.4g / L, the immersion time is 1.5h, the immersion temperature is 20°C, and the concentration of porridge is 4.5% during immersion. Squeeze and pulverize the soaked porridge solution to obtain cellulose powder with a urea content of 1.77%.

[0063] b. The pulverized cellulose is first pre-dried in a fluidized bed, and then transported and dried in a hot air pipeline to reduce the water content to about 5%, and then use an activation machine to circulate hot air at 190±2°C A rapid activation reaction of 50 min was carried out to obtain cellulose carbamate.

[0064] c. Stir and mix evenly the cellulose carbamate with a -5.2°C solvent compounded with 73.5g / L sodium hydroxide and 15.5g / L zinc oxide. Then, the mixture is placed in a low temperature environm...

Embodiment 2

[0069] a. The impregnation raw material is 7 batches of cotton pulp and wood pulp mixed in a ratio of 7:3. The average methylcellulose content of the pulp is 96%, and the average degree of polymerization is 380. The concentration of the impregnated urea solution is 15.2g / L, the impregnated time is 3h, the impregnated temperature is 24°C, and the urea content in the crushed material is 0.88%.

[0070] b. After the pulverized cellulose wet material goes through two steps of fluidized bed drying and hot air pipeline drying, the moisture content will be 3.51% from 51% after pressing, and then it will be dried under hot air circulation at 180±2℃ for a period of time. 60min high temperature rapid activation.

[0071] c. The activated cellulose carbamate is added to a mixed solvent with a certain concentration of sodium hydroxide and zinc oxide. The concentrations of sodium hydroxide and zinc oxide are 70.9g / L and 17.6g / L respectively, and the temperature is - 4.1°C. The solution w...

Embodiment 3

[0076] a. Put five batches of cotton pulp and hemp pulp with an average degree of polymerization of 660 and a methylcellulose content of 94% into the urea solution at a ratio of 9:1 for impregnation. The urea concentration is 50.1g / L, the immersion time is 2h, the immersion temperature is 22°C, and the concentration of porridge is 4.5% during immersion. Squeeze and pulverize the soaked porridge solution to obtain cellulose powder with a urea content of 2.91%.

[0077] b. The pulverized cellulose is first pre-dried in a fluidized bed, and then transported and dried in a hot air pipeline to reduce the water content to about 1%, and then use an activation machine to circulate hot air at 160±2°C A rapid activation reaction of 1.5h was carried out to obtain cellulose carbamate.

[0078] c. Stir and mix evenly the cellulose carbamate with a -6.8°C solvent compounded with 65.8g / L sodium hydroxide and 18.5g / L zinc oxide. Then the mixture is placed in a low-temperature environment of...

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Abstract

The invention provides a method for preparing a regenerated cellulose short fiber by a carbamate method. The method comprises: impregnation, activation, frozen glue block preparation, spinning solution preparation, spinning and post-treatment. Based on the existing viscose production line, through relatively continuous simple modification processes such as high temperature activation and two-stagethawing and melting, the existing viscose fiber production devices are fully used and 60% or more of the existing system is used in the method so that the equipment investment and the related expenseand time cost needed by the traditional capacity upgrading are saved, the production process is simple, production efficiency is high, the technique connection is reasonable and the operation practicability is strong. The method is suitable for industrial production, satisfies the urgent demands of industry upgrading and the transformation of new and old kinetic energy in the viscose fiber industry and acquires economic benefits, environmental benefits and social benefits.

Description

technical field [0001] The invention relates to a production process for preparing regenerated cellulose short fibers by a carbamate method, which belongs to the field of green processing and modification of polymer fiber materials, that is, a production technology for the industrial production of regenerated cellulose short fibers by carbamate method cellulose field. Background technique [0002] In today's world, making full use of renewable resources and taking the road of environmental friendliness and sustainable development has become the general trend of global science and technology and industrial development. Vigorously developing bio-based chemical fibers and their raw materials is an urgent need for the sustainable development of the chemical fiber industry and the realization of a low-carbon economy. According to expert predictions, the oil resources on the earth will be exhausted by the middle of this century. With the increasing shortage of oil resources, man-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/24D01F1/10D01D1/02D01D5/06C08B15/06
CPCD01D1/02D01D5/06D01F1/10D01F2/24C08B15/06
Inventor 徐元斌胡娜郭伟才马峰刚李道喜鹿泽波李娟李雅明徐导三
Owner 高密云鹰新材料科技有限公司
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