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Modified waste and old rubber, preparation method thereof and sound insulation mortar

A waste rubber and modification technology, applied in the field of building materials, can solve the problems of no sound insulation, easy to float, no mechanical properties, etc.

Inactive Publication Date: 2021-01-12
GUANGDONG BOZHILIN ROBOT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies, some waste rubber particles were directly mixed into the cementitious material, and some waste rubber particles were simply treated before being mixed into the cementitious material. However, due to the low density of rubber particles (about It is 1 / 3~1 / 2 of the cementitious material), and it is easy to float up in the sound insulation mortar, and once the rubber particles float up, it will form a stratification phenomenon that the upper layer is rubber and the lower layer is mortar. At this time, the rubber particles cannot be uniform Dispersed in mortar, not only has no sound insulation effect, but also has no mechanical properties
Moreover, the compatibility of rubber and cementitious materials is poor, resulting in poor integrity of the mortar, insufficient mechanical properties, and easy cracking in the later stage

Method used

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  • Modified waste and old rubber, preparation method thereof and sound insulation mortar
  • Modified waste and old rubber, preparation method thereof and sound insulation mortar

Examples

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preparation example Construction

[0030]A method for preparing modified waste rubber includes the following steps:

[0031]Take waste rubber particles with a particle size of 50 mesh to 100 mesh, soak in alkaline solution, take it out and dry, and then freeze at -20℃~-15℃ to prepare rubber particle intermediate;

[0032]The rubber particle intermediate and cement are mixed, and then water is added and placed for 10 to 24 hours to cause the cement to undergo a pre-hydration reaction.

[0033]Understandably, the main components of the waste rubber are natural rubber and synthetic rubber. It can be waste tires or other waste rubber products.

[0034]The mechanism of the present invention to modify waste rubber is as follows:

[0035](1) The particle size of rubber is inversely proportional to its surface area, and rubber is a natural water-repellent material, and the surface is easy to adsorb gas, so as the particle size decreases, the more gaps there are between it and cement hydration products, the The greater the gas effect, the g...

Embodiment 1

[0065]This embodiment provides a modified waste rubber and a preparation method thereof, the steps are as follows:

[0066]Take waste rubber particles with a particle size of 50 mesh to 100 mesh, soak them in NaOH solution for 20 minutes, take them out, dry at 45°C for 20 minutes, return to room temperature, and then freeze at -20°C for 20 minutes to prepare rubber particle intermediates;

[0067]Mix the rubber particle intermediate and cement at a volume ratio of 1:1, stir evenly, then spray water on the surface of the mixture of the two, and leave it for 1 day to pre-hydrate the cement wrapped on the surface of the rubber particle intermediate. Then it was placed in an oven at 60° C. to dry for 4 hours to obtain modified waste rubber.

Embodiment 2

[0069]This embodiment provides a modified waste rubber and a preparation method thereof, the steps are as follows:

[0070]Take waste rubber particles with a particle size of 50 mesh to 100 mesh, soak them in NaOH solution for 25 minutes, take them out, dry at 50°C for 25 minutes, return to room temperature, and freeze at -18°C for 20 minutes to prepare rubber particle intermediates;

[0071]Mix the rubber particle intermediate and cement at a volume ratio of 1.1:1, stir evenly, then spray water to the surface of the mixture of the two, and leave it for 1 day to pre-hydrate the cement wrapped on the surface of the rubber particle intermediate. Then it was placed in an oven at 60° C. to dry for 4 hours to obtain modified waste rubber.

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Abstract

The invention relates to modified waste and old rubber, a preparation method thereof and sound insulation mortar. The preparation method of the modified waste and old rubber comprises the following steps: taking 100-mesh waste rubber particles with the particle size of 50 meshes, soaking in an alkaline solution, taking out, drying, freezing at the temperature of -20 DEG C to 15 DEG C to prepare arubber particle intermediate, mixing the rubber particle intermediate and cement, adding water, and standing for 10 hours to enable the cement to be subjected to prehydration reaction. The waste and old rubber particles are physically and chemically modified in advance, so that the hydrophilicity of the waste rubber particles is improved, the air entraining effect of the waste rubber particles ina cement-based material is reduced, the waste rubber particles are more tightly combined with a hydration product of a gel material, the overall mechanical strength of the sound insulation mortar is kept, and the sound insulation mortar is not prone to cracking. Meanwhile, the density of the waste rubber particles is increased, the waste rubber particles are not prone to floating upwards after being added into cement mortar, and the sound insulation effect is good.

Description

Technical field[0001]The invention relates to the technical field of building materials, in particular to modified waste rubber, a preparation method thereof and sound insulation mortar.Background technique[0002]On the one hand, waste rubber is solid waste, including waste tires and other waste rubber products. With the rapid economic development, the number of vehicles has increased sharply, and the average life of automobile tires is about 2 years. Therefore, the pressure on disposal of waste tires is increasing. According to statistics, the stock of waste rubber tires in the world has reached more than 3 billion, and the number is increasing by 1 billion every year. Waste rubber tires (the main components are natural rubber and synthetic rubber) are called "black pollution", which not only deteriorates the natural environment and destroys plant growth, but also easily causes epidemic diseases. Therefore, how to dispose of waste rubber is an urgent problem to be solved. At present...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B18/22C04B28/16C04B111/52
CPCC04B18/22C04B20/1077C04B28/16C04B2111/52C04B2201/50C04B20/023C04B20/02C04B7/02C04B7/32C04B7/345C04B2103/0057C04B14/06C04B2103/302C04B2103/14C04B2103/50C04B2103/22C04B2103/465C04B16/06C04B14/28Y02W30/91
Inventor 于长涛唐振中张琴琴
Owner GUANGDONG BOZHILIN ROBOT CO LTD
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