Making method of hemp root bast filter paper for anti-fog and anti-haze mask

A technology for preventing haze and filtering paper, which is applied in pulp beating methods, pulping with inorganic alkalis, pulping with organic compounds, etc., can solve the problems of roughness, low application value, difficult processing, etc. The market application prospect is broad and the effect of good filtration efficiency

Inactive Publication Date: 2016-11-09
ZHEJIANG SCI-TECH UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The bast of hemp stalk can be directly used to make fibers, spin and prepare hemp yarn, but the bast of hemp root (from the soil surface to the near root bast on the ground, the length is about 0-20 cm) is relatively thick and hard. The fibers produced are relatively thick and hard, which are difficult to process in the spinning process and have little application value. They belong to waste textiles

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
  • Making method of hemp root bast filter paper for anti-fog and anti-haze mask
  • Making method of hemp root bast filter paper for anti-fog and anti-haze mask
  • Making method of hemp root bast filter paper for anti-fog and anti-haze mask

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) The bast of the hemp root was provided by Hanma Industry Investment Holding Co., Ltd. (Menghai County, Xishuangbanna Dai Autonomous Prefecture, Yunnan Province). The bast of the hemp root was cut into a length of 5 cm, and the concentration was 14% NaOH and 15% NaOH Anthraquinone is cooked in a 1:1 mixed solution by volume, cooking conditions: temperature 170°C, pressure 0.8 MPa, time 2.5h;

[0029] 2) Perform three bleaching processes: the first process uses 3% NaOH and 0.5% MgSO 4 Prepare a bleaching agent at a volume ratio of 1:1, place the cooked hemp root bast in the bleaching agent to form a slurry, the concentration of the slurry is 15%, the bleaching temperature is 110°C, the time is 1h, and the pressure is 0.7MPa; The second process uses a concentration of 2.5% ClO 2 The aqueous solution is used as the bleaching agent, the bleaching temperature is 70°C, and the time is 2.5h; the third process uses a 3% NaOH solution as the bleaching agent, and the bleaching t...

Embodiment 2

[0035] 1) The bast of the hemp root was provided by Hanma Industry Investment Holding Co., Ltd. (Menghai County, Xishuangbanna Dai Autonomous Prefecture, Yunnan Province). The bast of the hemp root was cut into a length of 5 cm, and the concentration was 14% NaOH and 15% NaOH Anthraquinone is cooked according to the mixed liquid with a volume ratio of 1:3, and the cooking conditions are: temperature 150°C, pressure 1 MPa, time 1.5h;

[0036] 2) Perform three bleaching processes: the first process uses 3% NaOH and 0.5% MgSO 4 Prepare a bleaching agent at a volume ratio of 1:2, place the cooked hemp root bast in the bleaching agent to form a slurry, the concentration of the slurry is 15%, the bleaching temperature is 100°C, the time is 1.5h, and the pressure is 0.7MPa ; The second process uses a concentration of 2.5% ClO 2 The aqueous solution is used as the bleaching agent, the bleaching temperature is 80°C, and the time is 1.5h; the third process uses a 3% NaOH solution as th...

Embodiment 3

[0042] 1) The bast of hemp root was provided by Hanma Industry Investment Holding Co., Ltd. (Menghai County, Dai Autonomous Prefecture, Xishuangbanna, Yunnan Province). Anthraquinone is cooked in a mixed solution with a volume ratio of 1:5. The cooking conditions are: temperature 190°C, pressure 0.6MPa, time 2h;

[0043] 2) Perform three bleaching processes: the first process uses 3% NaOH and 0.5% MgSO 4 Prepare a bleaching agent at a volume ratio of 1:5, place the cooked hemp root bast in the bleaching agent to form a slurry, the concentration of the slurry is 20%, the bleaching temperature is 90°C, the time is 3h, and the pressure is 1MPa; The second process uses a concentration of 2.5% ClO 2 The aqueous solution is used as the bleaching agent, the bleaching temperature is 50°C, and the time is 4h; the third process uses a 3% NaOH solution as the bleaching agent, and the bleaching temperature is 40°C, and the time is 4h;

[0044] 3) Use a ZQS2-45 beater to thaw the slurry ...

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

PropertyMeasurementUnit
tensile strength at breakaaaaaaaaaa
Login to view more

Abstract

The invention discloses a making method of hemp root bast filter paper for an anti-fog and anti-haze mask. The making method comprises the steps that hemp root bast is sequentially subjected to cutting, steaming, bleaching, defibering, pulping, papermaking, squeezing and drying. The thick and hard hemp root bast is made into the hemp root bast filter paper with large thickness, high quantitation, large hole diameter and high porosity, and reutilization of waste textiles is achieved. The filter efficiency of the made hemp root bast filter paper on NaCl aerosol particles with the size of 0.26 micrometer, the density of 15.6 mg/m<3> and the concentration of 2% reaches up to 99.94%-100%, and therefore the hemp root bast filter paper has the high air particle filter efficiency, can be applied to the anti-fog and anti-haze mask and has an efficient filter effect and a wide market application prospect.

Description

technical field [0001] The invention relates to a method for preparing filter paper, in particular to a method for preparing hemp root bast filter paper for anti-haze masks that can be applied in the field of air filtration. Background technique [0002] Haze refers to weather with atmospheric visibility less than 10 kilometers and relative humidity less than 80%, while fog is composed of fine water droplets and ice crystals near the surface, with visibility less than 10 kilometers but relative humidity greater than 95%. Since fog and haze sometimes appear simultaneously or alternately, we call this weather haze weather (Yuan Q, Li W, Zhou S, Yang L, Chi J, Sui X, et al. Integrated evaluation of aerosols during haze -fog episodes atone regional background site in North China Plain. Atmos Res. 2015;156:102-10.). Such smoggy weather will affect the climate, reduce visibility, endanger public health, and damage natural and agricultural environments (KimYJ, Kim KW, Kim SD, Le...

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
Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00D21C3/02D21C9/10D21D1/02D21F13/02D21H11/12
CPCD21C3/003D21C3/02D21C9/1057D21D1/02D21F13/02D21H11/12
Inventor 冯建永
Owner ZHEJIANG SCI-TECH UNIV
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