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A process for preparing environmentally friendly sound barrier sound absorbers by using plant fibers and foundry waste sand

A technology of plant fiber and foundry waste sand, which is applied in the direction of sound-generating devices, instruments, and layered products. It can solve problems such as poor low-frequency sound absorption performance, and achieve good corrosion resistance, relieve visual fatigue, and good mechanical properties.

Active Publication Date: 2020-05-08
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic products, the sound absorption coefficient is 0.1-0.3, the price is 220-500 yuan / m 2 , the cost is greatly reduced, but the low-frequency sound absorption performance is poor

Method used

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  • A process for preparing environmentally friendly sound barrier sound absorbers by using plant fibers and foundry waste sand
  • A process for preparing environmentally friendly sound barrier sound absorbers by using plant fibers and foundry waste sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific implementation is mainly two parts: (1) the making of plant fiber felt. Pretreatment and production of plant fibers: After collecting plant fibers, they are crushed and chopped into 6-12mm chopped fibers; soaked in alkaline solution for 2 hours; removed and dried; the surface layer is sprayed with coupling agent solution. Mix a certain proportion of water-based epoxy resin with curing agent and rutile titanium dioxide, spray it on the surface-treated plant fiber, and heat-press it. (2) Production of foundry waste sand particle board. For the pretreatment and production of foundry waste sand: sieve the collected foundry waste sand with a sieve size of 0.3 or 0.6mm. Mix a certain proportion of epoxy resin with pretreated foundry waste sand, stir evenly, and press to shape.

[0028] 1) The collected hemp fibers are crushed and chopped to form chopped fibers with a length of about 6-8 mm, which are soaked in 5% NaOH solution for 2 hours, and the soaking tempe...

Embodiment 2

[0036] The specific implementation is mainly two parts: (1) the making of plant fiber felt. Pretreatment and production of plant fibers: After collecting plant fibers, they are crushed and chopped into 6-12mm chopped fibers; soaked in alkaline solution for 2 hours; removed and dried; the surface layer is sprayed with coupling agent solution. Mix a certain proportion of water-based epoxy resin with curing agent and rutile titanium dioxide, spray it on the surface-treated plant fiber, and heat-press it. (2) Production of foundry waste sand particle board. For the pretreatment and production of foundry waste sand: sieve the collected foundry waste sand with a sieve size of 0.3 or 0.6mm. Mix a certain proportion of epoxy resin with pretreated foundry waste sand, stir evenly, and press to shape.

[0037] 1) The collected hemp fibers are crushed and chopped to form chopped fibers with a length of about 6-8 mm, soaked in 5% N1,N10-dimethylindolylethylamine solution for 2 hours, Th...

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Abstract

The invention belongs to the technical field of a sound barrier and particularly relates to a process for preparing an environment-friendly sound barrier sound-absorbing body by utilizing plant fiberand cast waste sand. The sound barrier sound-absorbing body comprises two layers of sound-absorbing bodies, namely a plant fibrofelt layer and a cast waste sand particle plate layer. Compared with theprior art, the process has the following advantages: the color of the cast waste sand can be effectively retained; the cast waste sand has small grain size, and grinding and pulverizing do not need to increase more processes and cost; the cast waste sand has high sand grain strength, forms fine grains and has high sound-absorbing plate mechanical property, the surface layer of the cast waste sandis coated with adhesive such as epoxy resin, and the corrosion resistance is high; and rutile type titanium dioxide is added in the manufacturing process of the plant fibrofelt, has most stable crystal form, a compact structure and high refractive index, so that the ultraviolet resistance of the epoxy resin can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of sound barriers, and in particular relates to an environment-friendly sound barrier sound-absorbing body prepared by using plant fibers and foundry waste sand. [0002] technical background [0003] my country's foundry industry is mainly based on sand casting, accounting for about 80-90%. According to statistics, 1.2 tons of foundry waste sand will be produced for every 1 ton of castings produced. Due to the difference in casting process, the additives added are also different, so that formaldehyde, sulfide, benzene, phenol and other substances remain on the surface of foundry waste sand. How to safely dispose and reuse such a large amount of foundry waste sand is a difficult problem in the foundry industry, and it is also a great harm and test to our living environment. At present, the main regeneration methods for foundry waste sand are concrete bricks, pavement bricks, refractory castables, waste sand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/02B32B9/04B32B5/16G10K11/16
CPCB32B5/02B32B5/16B32B9/048B32B2260/021B32B2262/06B32B2264/10B32B2307/10B32B2307/752G10K11/16
Inventor 崔东霞杨玉东常诚李登华舒兴旺林浩
Owner SHANXI PROVINCIAL RES INST OF COMM
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