Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of heat-oxidative aging-resistant natural rubber and its preparation method and natural rubber products

A natural rubber and natural latex technology, applied in the field of rubber, can solve the problems of long production cycle of natural rubber, waste of manpower and material resources, poor aging resistance of rubber materials, etc., to shorten the drying time, improve production efficiency, and high drying temperature Effect

Active Publication Date: 2022-04-26
万向新元科技股份有限公司 +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the flocculants used by traditional rubber factories in the flocculation treatment of latex are acid flocculants such as formic acid and acetic acid, and the rubber obtained by flocculation treatment has poor aging resistance.
Moreover, acid flocculation also has problems such as long coagulation time and the acid remaining in the rubber compound is not easy to clean, which leads to a long production cycle of natural rubber and wastes manpower and material resources.

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
  • A kind of heat-oxidative aging-resistant natural rubber and its preparation method and natural rubber products
  • A kind of heat-oxidative aging-resistant natural rubber and its preparation method and natural rubber products
  • A kind of heat-oxidative aging-resistant natural rubber and its preparation method and natural rubber products

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The present invention also provides a method for preparing the heat-oxidative aging-resistant natural rubber described in the technical solution, comprising the following steps:

[0031] a) mixing natural rubber latex and flocculant to obtain floc gel; said flocculant includes calcium chloride and organosilicon quaternary ammonium salt;

[0032] b) Dehydrating and drying the flocculated gel to obtain heat-resistant oxygen aging natural rubber.

[0033]In the preparation method provided by the invention, the natural rubber latex and the flocculant are firstly mixed. Wherein, the solid content of the natural rubber latex is preferably 20-25 wt%. In an embodiment provided by the present invention, the source of the natural latex is as follows: fresh natural latex or concentrated natural latex from the field is diluted to the required concentration to obtain the natural latex used in the present invention. In the present invention, the flocculant includes calcium chloride...

Embodiment 1

[0045] 1) Preparation of natural rubber resistant to heat and oxygen aging

[0046] Pretreatment of S1 natural rubber latex:

[0047] Concentrated natural latex is diluted to solid content and is 20wt%, with the dry weight of natural latex after dilution is 100phr meter, adds 0.2phr dimethyl octadecyl [3-(trimethoxysilyl) in the natural latex after dilution Propyl] ammonium chloride, stir evenly, let stand for half an hour.

[0048] S2 prepares calcium chloride solution:

[0049] The aqueous solution of calcium chloride is prepared, the concentration is 0.3wt%, standby; The dry weight of the natural rubber latex after diluting is 100phr, the consumption of calcium chloride in the follow-up flocculation process is 2phr.

[0050] S3 flocculation:

[0051] Under normal temperature and pressure, a vacuum flow pump is used to continuously convect and mix the pretreated natural rubber latex and calcium chloride solution according to the dosage ratio, and extrude with a screw to o...

Embodiment 2

[0063] 1) Preparation of natural rubber resistant to heat and oxygen aging

[0064] Pretreatment of S1 natural rubber latex:

[0065] The fresh natural latex in the field is diluted to solid content and is 22wt%, is 100phr meter with the dry weight of the natural latex after dilution, adds 0.25phr dimethyl octadecyl [3-(trimethoxysilyl) in the natural latex after dilution ) Propyl] ammonium chloride, after stirring evenly, then stir at low speed (20rpm) for 1 hour.

[0066] S2 prepares calcium chloride solution:

[0067] The aqueous solution of calcium chloride is prepared, the concentration is 0.5wt%, standby; Based on the dry weight of the diluted natural rubber latex as 100phr, the consumption of calcium chloride in the follow-up flocculation process is 3phr.

[0068] S3 flocculation:

[0069] Under normal temperature and pressure, a vacuum flow pump is used to continuously convect and mix the pretreated natural rubber latex and calcium chloride solution according to the...

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 strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of rubber, and in particular relates to a heat-oxidative aging-resistant natural rubber, a preparation method thereof and natural rubber products. The heat-oxidative aging-resistant natural rubber provided by the invention is made from natural rubber latex after flocculation, dehydration and drying; the flocculants used in the flocculation include calcium chloride and organosilicon quaternary ammonium salt. The present invention uses a compound flocculant including calcium chloride and organic silicon quaternary ammonium salt to carry out flocculation treatment on natural latex, which can make natural latex flocculate instantaneously, thereby greatly shortening the period of natural latex flocculation and coagulation, and improving the continuous degree of natural rubber production , improve the production efficiency of the natural rubber provided by the invention. At the same time, the residual flocculant in the coagulated rubber material is beneficial to the subsequent processing, so the rubber washing step can be omitted, and the production efficiency of the natural rubber provided by the invention can be further improved. Moreover, the use of the compound flocculant can also significantly improve the physical properties of the coagulated rubber, especially the improvement of the aging resistance is particularly significant.

Description

technical field [0001] The invention belongs to the field of rubber, and in particular relates to a heat-oxidative aging-resistant natural rubber, a preparation method thereof and natural rubber products. Background technique [0002] Rubber (Rubber) refers to a highly elastic polymer material with reversible deformation. It is elastic at room temperature, can produce large deformation under a small external force, and can return to its original shape after the external force is removed. Rubber is a completely amorphous polymer, its glass transition temperature (Tg) is low, and its molecular weight is often large, greater than hundreds of thousands. [0003] Rubber can be divided into two categories according to its source, natural rubber and synthetic rubber, among which natural rubber is the most widely used general-purpose rubber. Natural rubber is processed from natural latex collected from gum trees through flocculation, dehydration, and drying. At present, most of th...

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): C08C1/15
CPCC08C1/15
Inventor 朱业胜朱光苗李延珍
Owner 万向新元科技股份有限公司