Cellulose acetate made from raw material hemp dissolving pulp, preparation and use thereof

A technology of cellulose acetate and a manufacturing method, which is applied to artificial filaments made of cellulose derivatives, chemical instruments, methods, instruments, etc., can solve problems such as restricting the development of cellulose acetate, and achieve a simple manufacturing method and high product quality. Good and easy-to-operate effect

Inactive Publication Date: 2009-04-15
NANTONG CELLULOSE FIBERS CO LTD
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortage of wood pulp supply, the raw materials for the synthesis of cellulose acetate in my coun

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cellulose acetate made from raw material hemp dissolving pulp, preparation and use thereof
  • Cellulose acetate made from raw material hemp dissolving pulp, preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using hemp pulp with 87% R-10 and a viscosity of 4.2dl / g as raw material, cellulose acetate was prepared through the following process:

[0043] (1) Crushing of hemp pulp: crush the finished plate-shaped hemp pulp into a fluffy appearance through a grinder.

[0044] (2) Activation: Spray acetic acid on the pulverized hemp pulp. The consumption of acetic acid is 30% of hemp pulp weight, and the temperature of activation is 25 ℃, and activation time is 70 minutes.

[0045] (3) Acetylation: Based on the weight of hemp pulp, 200% acetic acid, 15% sulfuric acid, 200% acetic anhydride and hemp pulp are added to the acetylation reactor, and the initial temperature of the reaction starts from -10°C , the rate of temperature rise was controlled at 0.6° C. / min, and the time of the acetylation reaction was 30 minutes.

[0046] (4) Hydrolysis: a magnesium acetate aqueous solution with a mass concentration of 20% was used as a hydrolyzing agent, and was added in two portions 1 hou...

Embodiment 2

[0052] Using hemp pulp with 97% R-10 and a viscosity of 8.2dl / g as raw material, cellulose acetate was prepared through the following process:

[0053] (1) Crushing of hemp pulp: the finished flocculent hemp pulp is crushed into a velvet appearance through a grinder.

[0054] (2) Activation: Spray acetic acid on the pulverized hemp pulp. The consumption of acetic acid is 35% of hemp pulp weight, and the temperature of activation is 30 ℃, and activation time is 40 minutes.

[0055] (3) acetylation: take the hemp pulp weight as a basis, 300% acetic acid, 10% sulfuric acid, 220% acetic anhydride and hemp pulp are added in the acetic reaction reactor, and the initial temperature of reaction begins from 4 ℃, The rate of temperature rise was controlled at 0.8° C. / min, and the time of the acetylation reaction was 49 minutes.

[0056] (4) Hydrolysis: adopt the magnesium acetate aqueous solution that mass concentration is 20% as hydrolyzing agent, add in three times in 1 hour, 2.5 ho...

Embodiment 3

[0062] Using hemp pulp with 62% R-10 and a viscosity of 10dl / g as raw material, cellulose acetate was prepared through the following process:

[0063] (1) Crushing of hemp pulp: crush the finished plate-shaped hemp pulp into a fluffy appearance through a grinder.

[0064] (2) Activation: Spray acetic acid on the pulverized hemp pulp. The consumption of acetic acid is 200% of the hemp pulp weight, the temperature of activation is 40 ℃, and the activation time is 300 minutes.

[0065] (3) Acetylation: taking the hemp pulp weight as a basis, 800% acetic acid, 20% sulfuric acid, 400% acetic anhydride and hemp pulp are added in the esterification reactor, and the initial temperature of the reaction starts from 20°C. The rate of temperature rise was controlled at 0.5° C. / min, and the time of the acetylation reaction was 40 minutes.

[0066] (4) Hydrolysis: a magnesium acetate aqueous solution with a mass concentration of 10% was used as a hydrolyzing agent, and was added twice in ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses acetyl cellulose prepared by using hemp pulp as a raw material, a producing method and an application thereof, and products use the hemp pulp as the raw material and are obtained by steps of smashing, activating, acetylating, hydrolyzing, setting out, water washing and drying the hemp pulp and the like. The products are applied in materials of acetate fiber filaments, membranes, semi-permeable membranes, photosensitive films and the like for producing textile. The acetyl cellulose uses the hemp pulp as the raw material, and the invention is easily-obtained in raw material, simple in producing method, easy in operation and good in product quality.

Description

Technical field: [0001] The invention relates to cellulose acetate prepared by using hemp pulp as a raw material, its production method and application. Background technique: [0002] At present, the pulp raw material for synthesizing cellulose acetate generally comes from wood pulp. Due to the limitation of forestry resources, the processing cost of wood pulp is high, and the problem of environmental pollution is serious, many manufacturers in the world have closed down the factories of esterified wood pulp. Due to the shortage of wood pulp supply, the raw materials for the synthesis of cellulose acetate in my country mainly rely on imports, which largely limits the development of the domestic cellulose acetate industry. [0003] my country is rich in hemp resources with complete varieties, and has almost all the main hemp crops in the world. The main bast fiber crops cultivated are ramie, flax, hemp, kenaf (formerly known as kenaf), jute, and green hemp. At present, the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08B3/06D01F2/28B01D71/16G02B1/04
Inventor 马晓龙张杰曹建华陈昀郭叶书崔磊
Owner NANTONG CELLULOSE FIBERS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap