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Novel oil-resistant gutta-percha elastomer and preparation method thereof

A technology of eucommia gum and elastomer, applied in the field of rubber materials, can solve the problems of long reaction time, prone to side reactions, low grafting rate, etc., and achieve the effects of short reaction period, controllable reaction products and excellent mechanical properties

Active Publication Date: 2019-01-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free radical solution method uses thermal initiation, the reaction time is long (more than 5h), and the grafting rate is low; and due to free radical isomerization, side reactions are prone to occur during the reaction process

Method used

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  • Novel oil-resistant gutta-percha elastomer and preparation method thereof
  • Novel oil-resistant gutta-percha elastomer and preparation method thereof
  • Novel oil-resistant gutta-percha elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a Eucommia gum elastomer and its preparation method, using mercaptopropionic acid as a grafted small molecule, the specific steps are as follows:

[0032] Dissolving Eucommia gum in toluene to obtain a 3% Eucommia gum solution; feed nitrogen into the reaction flask, and add mercaptan (mercaptopropionic acid) equivalent to 3 times the molar mass of the Eucommia gum double bond , under photoinitiator DMPA (consumption is 2% of the dry glue quality of eucommia gum), ultraviolet light 365nm irradiation condition, react 5min, sink glue with ethanol after the end of reaction, dry 24 hours at 50 ℃, obtain modified Eucommia gum elastomer.

[0033] The grafted groups and grafting ratio were characterized by H NMR spectrum, the change of crystallization degree was characterized by XRD and polarizing microscope, the crystallization temperature and glass transition temperature were characterized by DSC, and the thermal stability was characterized by TGA.

...

Embodiment 2-6

[0036] Embodiments 2-6 respectively provide a kind of eucommia gum elastic body and its preparation method, using mercaptopropionic acid as the grafted small molecule, compared with Example 1, the difference is that the ultraviolet light irradiation time is different, and the irradiation time is 10-30min respectively , the specific conditions and the grafting ratio of the obtained Eucommia gum elastomer are shown in Table 1.

[0037] Table 1

[0038]

[0039]

[0040]by attaching figure 1 , figure 1 According to the H-NMR characterization, it can be seen that mercaptopropionic acid has successfully grafted on the double bond of the main chain of Eucommia gum.

[0041] by attaching figure 2 , figure 2 The comparison of the EUG-g-mercaptopropionic acid XRD spectra of different grafting rates shows that with the increase of the grafting rate, the crystalline structure in the molecular structure of Eucommia gum gradually decreases. When the ultraviolet light is illumin...

Embodiment 7-9

[0043] Embodiments 7-9 respectively provide a kind of Eucommia gum elastomer and preparation method thereof, using mercaptopropionic acid as the grafted small molecule. Compared with Example 1, the difference is that the amount of mercaptopropionic acid is different, and the amount of mercaptopropionic acid is different. The amount used was 2 times, 3 times, and 5 times the molar mass of the double bond in the molecular chain of eucommia gum; the photoinitiator DMPA was 2% of the mass of the dry glue of eucommia gum, and the irradiation time of the ultraviolet lamp was 10 min, as shown in Table 2.

[0044] Table 2

[0045]

[0046] by attaching image 3 , image 3 It can be seen from the DSC comparison chart that the glass transition temperature of the grafted eucommia gum has increased due to the introduction of a polar group, the carboxyl group, into the molecular chain of Eucommia gum.

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Abstract

The invention relates to the field of rubber materials, in particular to a novel oil-resistant gutta-percha elastomer and a preparation method thereof. According to the preparation method, gutta-percha serves as a raw material, and mercaptan serves as a graft micromolecule and is grafted onto original double bonds of the gutta-percha by using a click chemical method so as to obtain the novel oil-resistant gutta-percha elastomer. According to the novel oil-resistant gutta-percha elastomer and the preparation method thereof, a regular structure of trans-isoprene in a molecular chain of the gutta-percha is destroyed, so that the gutta-percha is in an elastomer form under the normal temperature condition, and the application field of the gutta-percha is expanded; and the grafting yield can becontrolled through the reaction time, when the grafting rate exceeds a critical value, a crystalline structure in the gutta-percha molecule can be destroyed, meanwhile, functional groups with different polarities are introduced, so that the physical properties of the gutta-percha are changed, and the gutta-percha is endowed with new chemical performance. Different from graft modification a traditional free radical method, the novel oil-resistant gutta-percha elastomer and the preparation method thereof have the advantages that the click chemical method is not liable to cause side reactions, inaddition, the reaction period is short, reaction products are controllable, and a process is simple.

Description

technical field [0001] The invention relates to the field of rubber materials, in particular to a novel oil-resistant Eucommia gum elastomer and a preparation method thereof. Background technique [0002] Natural rubber is a natural polymer with a molecular structure of cis-1,4-polyisoprene. This structural unit has no symmetry in the direction of the chain axis and has low crystallization ability. It only crystallizes under stretching and low temperature. It is a high-elastic general-purpose rubber with excellent comprehensive performance, and its elasticity is second only to general-purpose butadiene rubber. Since natural rubber is non-polar rubber, it has excellent insulation properties, low hysteresis loss, and good flex resistance. Natural rubber has excellent comprehensive properties and a wide range of applications. Tires in the field of transportation, conveyor belts, acid and alkali resistant gloves in the field of industry, tanks, aircraft, satellites in the fiel...

Claims

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Application Information

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IPC IPC(8): C08C19/20
CPCC08C19/20
Inventor 岳冬梅李娜张立群张继川
Owner BEIJING UNIV OF CHEM TECH
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