Method for modifying polarity of elastomer resin

A technology of elastomer resin and modification method, which is applied in the field of polar graft modification of elastomer resin melt to achieve the effect of avoiding excessive crosslinking and high grafting rate

Inactive Publication Date: 2012-07-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing melt modification method to modify the elastomer resin, it is usually impossible to control the crosslinking of the elastomer resin, and it is easy to obtain over-crosslinked products with dark color and poor thermoplasticity
And over-crosslinked products are not suitable for the preparation of thermoplastic elastomers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 100 kg of natural rubber resin and 1 kg of sorbic acid into the internal mixer at one time, set the speed at 60 rpm, and mix the above-mentioned mixed raw materials evenly at 50°C to obtain a compound rubber material. The mixing time is 13 minutes to 14 minutes; Then the obtained composite rubber is sent to a flat vulcanizing machine, and the composite rubber is melted at 150° C., and the components inside the melt are kept to react for 30 minutes, discharged, and cooled to obtain a natural rubber resin grafted with sorbic acid.

[0015] After the resulting product was placed in vacuum at room temperature for 24 hours, a small amount of sample was extracted with dimethyl sulfoxide to remove the sorbic acid that did not participate in the grafting, and the extract was titrated with potassium hydroxide solution, and the grafting ratio of sorbic acid was measured and calculated. The branch rate is 100%; the polar modified natural rubber resin is heated and dissolved wit...

Embodiment 2

[0017] Put 75 kg of nitrile rubber containing 33% acrylonitrile and 1 kg of sorbic acid into the internal mixer at one time, set the speed at 60 rpm, and mix the above mixed raw materials evenly at 35°C to obtain a compound rubber. The time is 9 minutes to 10 minutes; then the obtained composite rubber is sent to a flat vulcanizer, and the composite rubber is formed into a melt at 195°C, and the components inside the melt are kept to react for 55 minutes, and the material is discharged and cooled to obtain sorbic acid grafting. Modified nitrile rubber resin.

[0018] After the resulting product was placed in vacuum at room temperature for 24 hours, a small amount of sample was extracted with dimethyl sulfoxide to remove the sorbic acid that did not participate in the grafting, and the extract was titrated with potassium hydroxide solution, and the grafting ratio of sorbic acid was measured and calculated. The branch rate is 98.76%; the polar modified nitrile rubber resin is he...

Embodiment 3

[0020] Put 100 kg of mixed resin mixed with natural rubber and styrene-butadiene rubber resin at a weight ratio of 1:9, 2.5 kg of sorbic acid, and set the rotor speed at 60 rpm to the internal mixer at 45 °C. Mix the above-mentioned mixed raw materials evenly to obtain a compound rubber material. The mixing time is 14 minutes to 15 minutes; then send the obtained compound rubber material into a twin-screw extruder, and set the temperature of each section of the extruder barrel: 135 in zone Ⅰ ℃±2, Zone Ⅱ 140℃±2, Zone Ⅲ 145℃±2, Zone Ⅳ 150℃±2, Zone Ⅴ 155℃±2, Zone Ⅵ 160℃, the die head temperature is 180℃±2, and the screw speed is controlled to Make the composite rubber material into a melt, keep the components in the melt to react for 14-15 minutes, and just extrude from the die head, and cool to obtain a natural rubber-styrene-butadiene rubber mixed resin grafted with sorbic acid.

[0021] After the resulting product was placed in vacuum at room temperature for 24 hours, a small ...

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PUM

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Abstract

The invention relates to a method for modifying the polarity of elastomer resin, which is characterized in that: the elastomer resin is subjected to melt grafting modification by using sorbic acid as a grafting agent on the premise that an initiator is not added. The method comprises the following steps of: putting the elastomer resin and the sorbic acid (2,4-hexadienoic acid) into processing equipment at one time, and uniformly mixing at the temperature of between 20 and 80 DEG C to obtain composite glue; and feeding the composite glue into reaction equipment, making the composite glue become a melt at the temperature of between 135 and 200 DEG C, maintaining reaction of various components in the melt for 5 to 60 minutes, discharging, and cooling to obtain the elastomer resin subjected to polarity grafting modification. The method effectively solves the problem that the elastomer resin is over-crosslinked easily by the conventional modification technology, and the obtained polarity grafting modification product has thermoplasticity and a bright application prospect in the field of thermoplastic elastomers.

Description

technical field [0001] The invention relates to a method for modifying the polarity of an elastomeric resin, in particular to a method for modifying the polarity of an elastomeric resin melt. Background technique: [0002] Elastomer resins are mostly non-polar or weakly polar polyolefins, which can be modified with polarity. While maintaining the original characteristics, introducing polar or functional side groups into the molecular chain can broaden its application field. For example, improving its compatibility with polar materials and inorganic fillers, improving its dyeability, adhesion, hydrophilicity and antistatic properties, and enabling it to be used to prepare ionomers and coordination crosslinked rubber materials etc. [0003] Graft modification is one of the important methods in the functional modification of elastomeric resins, and has become the focus of research for many years. The known graft modification methods mainly include: solution modification meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F253/00C08F279/02C08F291/02
Inventor 陈荣国钱庆荣陈庆华肖荔人刘欣萍
Owner FUJIAN NORMAL UNIV
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