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Acrylate rubber (ACM)-based cellulose whisker damping material and preparation method thereof

A technology of cellulose whiskers and damping materials, which is applied in the field of damping material preparation, can solve the problems of high damping performance, low application value, and deterioration of mechanical properties of materials, so as to achieve the effect of improving mechanical properties and improving damping performance

Active Publication Date: 2018-03-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the research field of viscoelastic damping materials, there are mainly the following problems: (1) The good damping performance of viscoelastic damping materials is mainly around the glass transition temperature, but the lower glass transition temperature (mostly at minus degrees Celsius ) For actual working conditions, the application value is not high; (2) Viscoelastic damping materials often cannot take into account high damping performance (loss factor tan δ ≥0.3) and a wide effective damping temperature range (tan δ ≥0.3 temperature range) two conditions
(3) Viscoelastic damping materials cannot take into account high damping performance and high mechanical properties. In the process of preparing damping materials, a large amount of small molecule damping agents are often added, which inevitably deteriorates the mechanical properties of the material and cannot meet the actual application requirements.

Method used

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  • Acrylate rubber (ACM)-based cellulose whisker damping material and preparation method thereof
  • Acrylate rubber (ACM)-based cellulose whisker damping material and preparation method thereof
  • Acrylate rubber (ACM)-based cellulose whisker damping material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1, put bacterial cellulose in 0.2M NaOH solution and heat at 80°C for 2h, then filter and wash until the pH is neutral to obtain purified cellulose. Then grind the purified cellulose, add 50% sulfuric acid, stir at 60°C for 48 hours, and hydrolyze to obtain cellulose whisker slurry. Finally, the cellulose whisker slurry is centrifuged and washed at 12000rpm until the pH is neutral, and the cellulose whisker aqueous solution is obtained, and the cellulose whisker is characterized. The AFM diagram and its corresponding height diagram are as follows figure 2 As shown, the XRD pattern and its crystallinity index are as image 3 As shown, it was found that the aspect ratio of cellulose whiskers was 80, and the crystallinity was 93.33%;

[0032] Step 2, freeze-drying the cellulose whiskers obtained in step 1. Then 20g of cellulose whiskers are added to ethanol for ultrasonic dissolution to obtain a dispersion of cellulose whiskers in ethanol;

[0033] Step 3, accordi...

Embodiment 2

[0037] Repeat Example 1 method, but in step 1, sulfuric acid concentration is 60%, and the aspect ratio of the prepared cellulose whisker is 90, and crystallinity is 92%; The consumption of cellulose whisker in step 2 is 15g ; The mixing formula in step 3 is 100 parts of ACM rubber, 50 parts of hindered phenol small molecule AO-80, 3 parts of stearic acid, 2 parts of vulcanization accelerator D, 4 parts of vulcanization accelerator DOTG, 2 parts of antioxidant 4010NA, 3 parts 1 part of anti-aging agent RD, 1 part of processing aid RL210, 3 parts of processing aid WS280, 4 parts of sulfur. The effective damping temperature range of the obtained damping material is -13.3°C to 26.2°C, and the width of the temperature range reaches 39.5°C. The tensile strength is 9.78MPa, and the tear strength is 25.72kN / m.

Embodiment 3

[0039] Repeat the method of Example 1, but in step 1, the hydrolysis temperature is 50°C, the aspect ratio of the prepared cellulose whiskers is 75, and the crystallinity is 93%; the consumption of cellulose whiskers in step 2 is 10g ; The mixing formula in step 3 is 100 parts of ACM rubber, 30 parts of hindered phenol small molecule AO-60, 2 parts of stearic acid, 2 parts of vulcanization accelerator DOTG, 3 parts of antioxidant RD, 2 parts of processing aid WB222, 1 part Processing aid WS280, 3 parts of sulfur. The effective damping temperature range of the obtained damping material is -12.6°C to 25.8°C, and the width of the temperature range reaches 38.4°C. The tensile strength is 9.34MPa, and the tear strength is 24.59kN / m.

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Abstract

The invention discloses an acrylate rubber (ACM)-based cellulose whisker damping material and a preparation method thereof. The method is characterized in that cellulose whiskers with certain sizes and crystallinity are prepared by adjusting acid consumption, temperature and time; ACM is mixed with various compounding ingredients such as hindered phenol micromolecules and a vulcanizing agent by using a mechanical blending method; then, the ACM damping rubber, which contains the cellulose whiskers and has a wide temperature range and higher mechanical strength, is obtained by using a solution blending process and mixing and vulcanizing the cellulose whiskers. Strong hydrogen bonds are formed among the cellulose whiskers, the hindered phenol micromolecules and the ACM by adding the cellulosewhiskers, which have a large length-diameter ratio and contain a large number of hydroxyl groups on the surfaces, into the ACM, so that the effective damping temperature range (tan delta is greater than or equal to 0.3) of the ACM-based cellulose whisker damping material is greatly enlarged, and the mechanical properties are also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of damping material preparation, and in particular relates to an acrylic ester rubber (ACM)-based cellulose whisker damping material with a wide temperature range and relatively high mechanical strength and a preparation method thereof. Background technique [0002] With the development of contemporary industrial technology, various fields have gradually realized the mechanization and automation of production. Although this has brought great convenience to our production and life, the accompanying vibration and noise have also brought great hidden dangers to our physical and mental health. At the same time, vibration will also seriously affect the mechanical equipment. service life and increase equipment maintenance costs. Therefore, shock and noise reduction has become an urgent problem to be solved. Using damping material is one of the main means to solve this problem. Viscoelastic damping material is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/04C08L1/04C08K13/02C08K5/09C08K3/06C08K5/31C08K5/134C08K5/1575C08B15/02
CPCC08B15/02C08L33/04C08L1/04C08K13/02C08K5/09C08K3/06C08K5/31C08K5/1575C08K5/1345
Inventor 贾红兵张旭敏王冬妮尹清王丽平李耕姜宽章琬琪徐赵东
Owner NANJING UNIV OF SCI & TECH