Application of Chitosan and Its Derivatives in Chemical Industry

Applied Journal of Shandong Normal University (Natural Science Edition) Chitosan and Its Derivatives in Chemical Applications Liu Changzhen Cui Wenxin Li Chengbin (School of Life Sciences, Shandong Normal University, Jinan, Jinan 250014; first author 57 years old, female, senior engineer) in various fields There are more and more applications for further review.

As a natural polymer material with rich resources and excellent performance, chitosan has received extensive attention from scholars at home and abroad for its development and application. In the past ten years, more than one thousand published papers have been published. Its application scope involves Chemicals, pharmaceuticals, environmental protection, food care and various functional membrane materials and many other fields. This article only summarizes the application of chemicals, environmental protection and other aspects.

1 Environmental protection and water treatment Chitosan has made great progress in its use as a flocculant and adsorbent in water treatment processes. The amount of chitin used in this field accounts for the largest proportion of its total production. The reason for this is that conventionally used inorganic or organic flocculants, although effective, are often susceptible to secondary pollution due to their large conventional amounts, high processing costs, or the high toxicity of the residues. Therefore, the development of non-toxic, safe, cheap, no secondary pollution flocculant has become a world-wide topic. Chitosan has unique advantages in the above aspects and is biodegradable.

1.1 Purification of Drinking Water 111 Chitin, together with activated carbon and ion exchange resins, can remove or reduce (1) D, Cfc, Fe, and bacteria in tap water. Environmental protection agencies in developed countries such as the United States and Japan have approved the use of chitosan to purify drinking water, and the recommended maximum concentration is 10 mgL of commercially available US products.

1.2 Chitosan and chitosan on the coupling and adsorption of heavy metal ions Chitosan can form stable conjugates through amine groups, hydroxyl groups, and heavy metal ions in the molecule. Therefore, chitosan can be used for this combination. The performance removes Hg2+, Cu2+, Cd2+, Pb2+, and Co2+ ions in the sewage. For example, chitosan can remove all heavy metal ions from 30%CaCl2 and 60pmFe"+ solutions. In 0.02mol/L CuSO4 solution, 80% of Cu2+ chitosan and CS2 reacted with xanthogenate are removed. The 10% sodium salt solution 1.8 ml can reduce 100% of the 100/g Cd2+ solution or 100/Hg2+ solution at pH 3.5 for 30 min, reducing the Cd2+ and Hg2+ contents of the solution to 1.4 in the wastewater treatment industry. In the wastewater of the food industry, flocculants generally act in two ways: one is to improve the quality of the product, and the other is to treat the waste water, recover the materials, increase the yield and reduce the water pollution.

The protein is a zwitterion and is a negative ion at the pH above the isoelectric point|21. The isoelectric point of the protein in the food industry is mostly in the acidic range, and therefore can be agglutinated with a cationic flocculant in the neutral vicinity. Chitosan is Cationic flocculants are very suitable for this purpose. For example, in the production of fishmeal, the liquid extracted from the cooked fish contains suspended minced fish. Although it is centrifuged at high speed, it still contains a large amount of colloidal particles of suspended protein. If 1000 parts of this suspension are added, 35 parts of 0.5% shellfish are added. The sugar acetic acid solution and suspension can be agglutinated and separated. The fish meal yield is 11.8%, and the COD is removed by more than 50%. The solid content in the waste water is reduced by about 90%.

2 The mordant and fabric finishing agents used in the textile industry for chitosan have good affinity for fabrics, leathers, fibers, etc. It not only has strong absorption, but also has wrinkle and abrasion resistance. *Supported by the Natural Science Foundation of Shandong Province (109034) The Journal of Shandong Normal University (Natural Science) uses a mordant. When the fiber is treated with 0.5% chitosan, the color fastness of the fiber can be added. Therefore, the domestic printing The film forming agent Acraming and the paint printing adhesive 707 have been used in the printing and dyeing industry. The chitosan is treated with chitosan solution in acetic acid. Chitosan penetrates into the fiber and forms a layer of water-insoluble protective film after drying. It can make the fabric crisp and use this solution to treat the pulp. The tensile force of the silk can be increased by 20%. ~25% clothing made from such fabrics can improve the soaping fastness and perspiration fastness of direct dyes.

3 Excellent additives in the cosmetics industry Zeng Jia, Zheng Lianying, Yu Shiqing. New developments in the application of chitin and its derivatives in the food industry. Food Industry Technology, 2(1)2 Yan Rui. Water-soluble polymers Dong Xuechang, Yang Yanbing. New trends in the application of chitin and glycans. Journal of Yunnan University for Nationalities, 2002. New developments in chitin and its derivatives. Ningxia Petrochemical, 2000 Blue Phoenix. The application and preparation of chitosan. Chemical New Materials, 2002

Slewing Bearing

Swing bearing

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About our Slewing Rings

Name slewing ring bearing / Excavator SWING CIRCLE
Suitable Brand Excavator
Suitable Model Excavator
Original China
AplliCartion Excavator
Warranty

One year

Delivery time wihtin 3 days after payment confirmed
MOQ 1 set
Packing standard export carton & wooden case or as your require

Many types of excavator slewing bearing for your purchase.

Excavator Brand

Model No.

Excavator

PC30

PC40

PC60-6 (Z=76)

PC60-6 (Z=80)

PC60-7 (Z=76)

PC70-7

PC75U

PC90

PC90-6

PC100-5

PC120-5

PC120-6 (4D95)

PC120-6 (4D102)

PC130-7

PC128UU

PC150-5

PC20HT

PC200-1

PC200-2

PC200-3

PC220-3

PC220-5

PC200-6 (S6D95)

PC200-6P (S6D102)

PC200-7 (Z=92)

PC220-7

PC228UU

PC300-2

PC300-3

PC300-5

PC300-6

PC300-7

PC350-6

PC360-7

PC400-3

PC400-5

PC400-6

PC450

Excavator

HD450-7

HD512

HD100

HD700-1

HD700-2

HD700-5

HD700-7

HD770SE

HD770-1

HD770-2

HD800-7

HD820-1

HD900-7

HD1250-5

HD250-5

HD250-7

HD307

HD516

HD400-7

HD450-5

Excavator
Excavator

EX60-1

EX60-2

EX60-3

EX60-5

EX90

EX100-1

EX100-3

EX100-5

EX120-1

EX120-2

EX200-3

EX200-5

EX210-5

ZX120

ZX160

EX200-1

EX200-2

EX200-3

EX200-5

EX210-5

ZX200

ZX200-3

ZX225

EX220-5

ZX230

ZX240

ZX270

EX300-1

EX300-2

EX300-3

EX300-5

ZX330

EX450

ZX480

Excavator

DH55-5

DH60-7

DH150-7

DH200-3

DH220-3

DH102

DH225-7

DH258-7

DH280

DH290

DH300-5

DH320

DH330-3

DH360-5

DH500

Excavator

SK03

SK09

SK907B

SK100

SK120-5

SK200-1

SK200-2

SK200-5

SK200-6

SK200-8

SK230-6

SK300

SK350-8

Excavator

SH120A2

SH120A3

SH200A1

SH200A2

SH200A3

SH200G3

SH200C3

SH210A3

SH220A1

SH225

SH260

SH265

SH280

SH300/A2

SH340

SH350

SH430

SH40T

SH580

Excavator

R60-5

R60-7

R80-7

R130-5

R130-7

R140

R150W

R170

R200

R210-3

R220-5

R210-9

R215-7

R225-7

R245

R260-5

R280

R290

R300

R305-7

R320

R335-7

R360

R450

Excavator

EC55

EC210

EC240

EC290 EC360

Excavator swing bearing is divided into various specifiCartions:


1.single-row ball slewing bearings with outer teeth or inner teeth , or without teeth;

2.single-row cross roller slewing bearings;

3.double-row different diameter balls slewing bearings;

4.three-row roller slewing bearings and etc.


AppliCartion:


1.Construction Machinery : Cranes, Excavators

2.Mining/Heavy Equipments

3.Port/Marine/Offshore Machinery

4.Forest Industries Equipment


The single-row four points contact ball Slewing Bearing is composed of 2 seat-rings.It features compact in design,and light in weight.

The balls contact with the circular race at four points,via which the axial force,radial force and resultant moment may be born simultaneously.

It may be used for slewing conveyers,welding arms and positioners,light,medium duty cranes,excavators and other engineering machines.

Slewing Ring Bearing Features:

1.High load-carrying capability

2.Ability to accept the combined loads;axial ,radial and tilting moments

3.Flexibility with product design.

4.42CrMo/50Mn material be used to make slewing ring bearing


Product Catalog


1. Single row four point contact ball series.
2. Single-row crossed roller series.
3. Double row ball series.
4. Three-row roller series.
5. Roller and ball combination series.
6. Lightweight outline slewing ring.

Slew bearing for Single-row ball(HS Series)

1. Id:320-4500 Od:550-4500mm
2.material: 52Mn,42CrMo
3.OME service
4.ISO9001-2000 certifiCarte
5.R&D capacity

6.Tolerance:ABEC-1 standard

7.Basic loading rating:Dynamic & Static depend on different model

Dimensions

Mount dimensions

Number of holes

Gear parameters

Designation

mm

mm

m

mm

z

mm

D

d

T

H

h

D1

d1

dn

n

n1

Da

b

662

458

80

70

10

626

494

18

20

4

5

689

135

60

011.30.560

662

458

80

70

10

626

494

18

20

4

6

688.8

112

60

012.30.560

732

528

80

70

10

696

564

18

24

4

6

772.8

126

60

011.30.630

732

528

80

70

10

696

564

18

24

4

8

774.4

94

60

012.30.630

812

608

80

70

10

776

644

18

24

4

6

850.8

139

60

011.30.710

812

608

80

70

10

776

644

18

24

4

8

854.4

104

60

012.30.710

922

678

100

20

10

878

722

22

30

6

8

966.4

118

80

011.40.800

922

678

100

20

10

878

722

22

30

6

10

968

94

80

012.40.800

1022

778

100

90

10

978

822

22

30

6

8

1062.4

130

80

011.40.900

1022

778

100

90

10

978

822

22

30

6

10

1068

104

80

012.40.900

1122

878

100

90

10

1078

922

22

36

6

10

1188

116

80

011.40.1000

1122

878

100

90

10

1078

922

22

36

6

12

1185.6

96

80

012.40.1000


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