Polyurethane prepolymer for manufacturing printing cleaning scraper rubber sheet

A technology of polyurethane prepolymer and cleaning blade, applied in the field of polyurethane prepolymer, can solve the problems of high content of free polyisocyanate monomer, high viscosity at process temperature, monotonous segment structure, etc., and achieve low content of free isocyanate monomer , The effect of less edge defects and good wear resistance

Pending Publication Date: 2018-12-07
中山绿材新材料科技有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to solve the problems of existing polyurethane prepolymers such as relatively monotonous segment structure, high viscosity at process temperature and high content of free polyisocyanate monomers, etc.

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
  • Polyurethane prepolymer for manufacturing printing cleaning scraper rubber sheet
  • Polyurethane prepolymer for manufacturing printing cleaning scraper rubber sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The polyurethane prepolymer formula adopts oligomer diol combination and diisocyanate combination raw materials, and the oligomer diol combination includes polyether diol and polyester diol, and the oligomer diol The oligomer diols included in the combination are polyether diols PPG600, PPG2000 and polyester diols PBA2000, m PPG600 :m PPG2000 :m PBA2000 =3:2:1, the diisocyanate combination only includes diphenylmethane diisocyanate (MDI), and the ratio f=n of the oligomer diol combination and the diisocyanate combination -OH(低聚物二元醇组合的羟基摩尔总数) / n -NCO(二异氰酸组合的异氰酸基摩尔总数) = 0.60. The polyurethane prepolymer segment structure obtained by fully reacting the oligomer diol combination and the diisocyanate combination has the characteristics of complementary diversity, is liquid at normal temperature (25°C), and has a viscosity equal to 850mPa·s at 80°C. The free isocyanate monomer content is equal to 0.10%.

[0014] The polyurethane prepolymer process adopts the synthesis m...

Embodiment 2

[0019] The polyurethane prepolymer formula adopts oligomer diol combination and diisocyanate combination raw materials, and the oligomer diol combination includes polyether diol and polycaprolactone diol, and the oligomer diol The oligomer diols contained in the polyol combination are polyether diol PPG400, PPG1000 and polycaprolactone diol PCL2000, m PPG400 :m PPG1000 :m PCL2000 =1:1:2 said diisocyanate combination comprises two kinds of diphenylmethane diisocyanate (MDI) and dicyclohexylmethane diisocyanate (HMDI), and the proportioning ratio of said oligomer dibasic alcohol combination and diisocyanate combination f=n -OH(低聚物二元醇组合的羟基摩尔总数) / n -NCO(二异氰酸组合的异氰酸基摩尔总数) = 0.55. The polyurethane prepolymer segment structure obtained by fully reacting the oligomer diol combination and the diisocyanate combination has complementary and diverse characteristics, is liquid at normal temperature (25°C), and has a viscosity equal to 800mPa·s at 80°C. The free isocyanate monomer cont...

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
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a polyurethane prepolymer for manufacturing a printing cleaning scraper rubber sheet. The polyurethane prepolymer solves the problem that the existing polyurethane prepolymer has a single chain structure, large viscosity at the process temperature and high free isocyanate monomer content so that the castable printing cleaning scraper rubber sheet has poor elasticity, poor abrasion resistance, poor flatness caused by rubber sheet rolling and corrugation and edge defects caused by residual microbubbles. The polyurethane prepolymer provided by the invention utilizes oligomer diol composition and diisocyanate composition raw materials and a ratio f=n-OH (hydroxyl group mole total amount of the oligomer diol composition) / n-NCO (isocyanate mole total amount of the diisocyanate composition) is 0.5-0.7. The preparation method utilizes a dynamic reaction on-line detection synthesis method, the viscosity of the reaction materials is less than 1000mPa.s, the free isocyanate monomer content is less than 0.2% and the occupational health case of the production environment is improved.

Description

technical field [0001] The invention relates to the technical field of polyurethane prepolymers, in particular to polyurethane prepolymers used for manufacturing printing cleaning blade films. Background technique [0002] Polyurethane prepolymer refers to a prepolymer containing a urethane bond structure, which is widely used in coatings, adhesives, leather and other industries and in the manufacture of industrial parts. Polyurethane prepolymer is used in the printing consumables industry to make cleaning blade film, which is assembled in the toner drum assembly unit to clean the toner. At the process temperature, the polyurethane prepolymer and the curing agent are mixed and degassed according to a certain ratio, and poured into a mold for curing to form a cleaning blade film. The elasticity, wear resistance, flatness and non-damage of the film edge of the cleaning blade film are crucial to the toner cleaning effect of the cleaning blade, and the segment structure and pro...

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): C08G18/48C08G18/42C08L75/06C08L75/08
CPCC08G18/4018C08G18/42C08G18/4277C08G18/4825C08L75/06C08L75/08
Inventor洪河谋其他发明人请求不公开姓名
Owner中山绿材新材料科技有限公司