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Narrow distribution linear phenolic resins and preparation method thereof

A technology of novolak resin and phenols, which is applied in the field of narrow distribution novolac resin and its preparation, which can solve the problems of long reaction time, affecting resin performance, and difficulty in process control, and achieves low oligomer content and narrow molecular weight distribution Effect

Inactive Publication Date: 2007-11-28
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of NaOH, and the reaction time is too long, so it is difficult to realize industrial production
Chinese patent 00135829.4 introduces the improved process of the above process route. Although the reaction time is reduced, the process control of the process of alkali first and then acid is difficult, and it is difficult to realize industrial production
[0008] In Chinese patent 00131050.X, organophosphoric acid is used as catalyst to prepare phenolic resin with narrow molecular weight distribution. In the reaction, a large amount of catalyst needs to be added, and the catalyst needs to be washed with water to separate the catalyst from the resin. This will increase the manufacturing cost and increase the amount of waste water. Without water washing, a large amount of catalyst will remain in the resin, which will seriously affect the performance of the resin

Method used

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  • Narrow distribution linear phenolic resins and preparation method thereof
  • Narrow distribution linear phenolic resins and preparation method thereof
  • Narrow distribution linear phenolic resins and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Phenol 502g, cardanol 38g, 37% formaldehyde aqueous solution 371g and lithium-based bentonite 100g, oxalic acid 10g are dropped into in the reaction container that has thermometer, agitator, reflux condenser, heat up to 80 ℃ constant temperature reaction 1 hour, then in Raise the temperature to 90°C, react at a constant temperature for 1 hour, and finally raise the temperature to 100°C, react at a constant temperature for 3 hours, end the reaction and carry out atmospheric distillation, heat to 150°C, and then dehydrate and dephenolize by vacuum distillation at -0.092MPa to obtain 656g of phenolic resin A. The GPC spectrogram of gained phenolic resin is shown in Fig. 1.

Embodiment 2

[0027] Put 445g of phenol, 324g of 37% formaldehyde solution, 90g of lithium-based bentonite, and 9g of oxalic acid into a reaction vessel with a thermometer, a stirring device, and a reflux condenser, heat up to 80°C for constant temperature reaction for 1 hour, and then heat up to 90°C , react at constant temperature for 1 hour, finally raise the temperature to 100°C, react at constant temperature for 3 hours, end the reaction and carry out atmospheric distillation, heat to 150°C, and then dehydrate and dephenolize by vacuum distillation at -0.092MPa to obtain 540g of phenolic resin B . The GPC spectrogram of the obtained phenolic resin is shown in Figure 2.

Embodiment 3

[0029] Phenol 325g, cardanol 16g, 37% formaldehyde solution 248g and lithium-based bentonite 65g, oxalic acid 6.5g are dropped into in the reaction container that has thermometer, stirring device, reflux condenser, heat up to 80 ℃ constant temperature reaction 1 hour, then Raise the temperature to 90°C, react at a constant temperature for 1 hour, and finally raise the temperature to 100°C, react at a constant temperature for 3 hours, end the reaction and carry out atmospheric distillation, heat to 150°C, and then dehydrate and dephenolize by vacuum distillation at -0.092MPa. Obtain 422g of phenolic resin C. The GPC spectrogram of the obtained phenolic resin is shown in Figure 3.

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Abstract

The present invention discloses one kind of linear phenolic resin with narrow molecular weight distribution and its preparation process. The linear phenolic resin is prepared with phenols and aldehydes under the action of composite catalyst including acid and layer silicate. It has the features of low oligomer content and narrow molecular weight distribution, and may be applied as the adhesive for Bakelite, friction material, grinding tool, etc.

Description

technical field [0001] The invention relates to a high molecular polymer and its preparation method, in particular, the invention relates to a narrow distribution novolac resin and its preparation method. Background technique [0002] Novolac resins are generally obtained by reacting phenols and aldehydes in the presence of acidic catalysts, including inorganic acids and organic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, oxalic acid, p-toluenesulfonic acid, etc. Phenols and aldehydes react in a homogeneous phase at first, and then change to a heterogeneous reaction starting from emulsification, and the reaction is further advanced. After confirming the formation of an initial condensate with the expected degree of condensation, the condensation reaction is terminated, and then passed Concentrate under reduced pressure to reduce the content of low molecular weight components in the initial condensate, and dehydrate, then novolak resin can be made. Gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/24
Inventor 唐路林刘为刘翠花
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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