阅读说明：本技术 热固性塑料废料的处理方法 (Method for treating thermosetting plastic waste ) 是由 顾爱飞 于 2019-02-18 设计创作，主要内容包括：本发明揭示了一种热固性塑料废料的处理方法包括如下步骤,将热固性塑料废料放入至慢速碾滚式粉碎机内粉碎,粉碎机转速150-200转/分钟,控制颗粒细度40-80目；将经过粉碎后的热固性塑料废料和复合材料按比例混合,形成混合料；将混合料放入绞龙式冷压机内,冷压搅拌后混炼造粒,过程中无需加热,没有废气污染。本发明中热固性塑料废料不参与化学变化,仅作为填充物,理论反应时间比普通材料的成型速度减少了40%,并且使原先无法再次利用的热固性塑料废料重新变为原料使用。(The invention discloses a method for treating thermosetting plastic waste, which comprises the following steps of putting the thermosetting plastic waste into a slow-speed rolling type crusher for crushing, controlling the particle fineness to be 40-80 meshes at the rotation speed of the crusher of 150-; mixing the crushed thermosetting plastic waste and the composite material in proportion to form a mixture; the mixture is put into an auger type cold press, and is mixed and granulated after cold pressing and stirring, heating is not needed in the process, and waste gas pollution is avoided. The thermosetting plastic waste material does not participate in chemical change and is only used as a filler, the theoretical reaction time is reduced by 40 percent compared with the forming speed of a common material, and the thermosetting plastic waste material which cannot be reused originally is changed into a raw material again for use.)

1. A method for treating thermosetting plastic waste, characterized by comprising the steps of,

s1, putting the thermosetting plastic waste into a slow-speed rolling type crusher for crushing, wherein the rotation speed of the crusher is 150-;

s2, mixing the crushed thermosetting plastic waste and the composite material in proportion to form a mixture;

and S3, putting the mixture into an auger type cold press, mixing and granulating after cold pressing and stirring, wherein heating is not required in the process, and no waste gas pollution is caused.

2. The method of claim 1, wherein the waste thermosetting plastic materials include, but are not limited to, phenolics, modified phenolics, dry unsaturated polyesters, melamines, urea formaldehyde.

3. The method for treating thermosetting plastic waste material according to claim 1, wherein the composite material is prepared from the following raw materials in percentage by weight:

50% -55% of phenolic resin;

10-40% of wood powder;

10-20% of mineral filler;

10-13% of urotropin;

0.5-2% of a coloring agent;

1-3% of zinc stearate;

1-3% of magnesium oxide;

uniformly mixing the raw materials and the purified wood powder, and plasticating, crushing and granulating.

4. The method for treating the thermosetting plastic waste material, according to claim 3, characterized in that the wood flour has a fineness of 80-100 mesh, a moisture content of 10% or less, an apparent density of 0.15-0.27 g/cm3, and an ash content of 3% or less.

5. The method of claim 3, wherein the mineral filler is toothpaste grade aluminum hydroxide.

6. The method for treating thermosetting plastic waste according to claim 3, wherein the particle size of urotropin is 200 to 300 mesh.

7. The method for treating thermosetting plastic waste according to claim 3, wherein the colorant is carbon black.

8. The method for treating thermosetting plastic waste material according to claim 3, wherein the wood flour is preferably 10 to 20%.

9. The method for processing thermosetting plastic waste according to claim 3, wherein the mixing ratio of the thermosetting plastic waste and the composite material is 4: 6.

Technical Field

The invention relates to a method for treating thermosetting plastic waste, belonging to the technical field of plastic granulation.

Background

Along with the rapid development of social economy and industry, considerable economic benefits are brought, and the living standard of common people is improved. The environmental protection problem is also increasingly paid attention to, and the plastic industry is an indispensable molecule in life and industrial production, as low as family kitchen, and as high as military industry and aerospace, the shadow can be seen everywhere. With the increasing of environmental protection investigation and treatment of government related departments in recent years, a plurality of industrial garbage disposal problems which have to be generated in the plastic industrial production are also deeply troubling a plurality of enterprises.

Plastics can be divided into two broad categories depending on their molding conditions: thermoplastic and thermoset. Thermoplastics have now been subjected to well-established recycling processes because of their relatively simple molding conditions (physical reaction, reversibility). The thermosetting plastic has the congenital advantages that the molding conditions are relatively complex (high temperature and high pressure are needed and chemical reaction is adopted, the molding is irreversible) and the finished product has higher high temperature resistance, aging resistance, strength and other properties than common thermoplastic plastics, so that the field of recycling of the thermosetting plastic is blank at home. The injection molding manufacturer inevitably produces material handles and defective products in the production process, and the total proportion of the material handles and the rejection rate is 15%, so that the amount of waste materials flowing into the society every year can be counted by thousands of tons. The general injection molding manufacturers do not have the capacity of treating the industrial garbage and can only carry out unified recovery, landfill and incineration treatment.

Only a few enterprises experimentally use the ground crop boiler fuel, but high-temperature incineration can generate a large amount of irritant gas, so that the environment pollution is serious. The economic value of the waste materials is far higher than that of common fuels, and the waste materials are wasted on social resources. And the enterprises process the waste materials by a high-speed centrifugation method, the method cannot effectively control the granularity during processing, more fine powder with the granularity larger than 1000 meshes is generated, and the fine powder can cause secondary pollution if not properly processed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for treating thermosetting plastic waste.

The technical problem to be solved by the invention can be realized by the following technical scheme:

a method for treating thermosetting plastic waste comprises the following steps:

s1, putting the thermosetting plastic waste into a slow-speed rolling type crusher for crushing, wherein the rotation speed of the crusher is 150-;

s2, mixing the crushed thermosetting plastic waste and the composite material in proportion to form a mixture;

and S3, putting the mixture into an auger type cold press, mixing and granulating after cold pressing and stirring, wherein heating is not required in the process, and no waste gas pollution is caused.

Preferably, the thermosetting plastic waste includes, but is not limited to, phenolics, modified phenolics, dry unsaturated polyesters, melamine, urea formaldehyde.

Preferably, the composite material is prepared from the following raw materials in percentage by weight:

50% -55% of phenolic resin;

10-40% of wood powder;

10-20% of mineral filler;

10-13% of urotropin;

0.5-2% of a coloring agent;

1-3% of zinc stearate;

1-3% of magnesium oxide;

uniformly mixing the raw materials and the purified wood powder, and plasticating, crushing and granulating.

Preferably, the fineness of the wood flour is 80-100 meshes, the water content is less than or equal to 10%, the apparent density is 0.15-0.27 g/cm3, and the ash content is less than 3%.

Preferably, the mineral filler is toothpaste grade aluminum hydroxide.

Preferably, the colorant is carbon black.

Preferably, the mixing ratio of the thermosetting plastic waste and the composite material is 4: 6.

The invention has the beneficial effects that: the proportion of the wood powder and the mineral filler in the composite material is lower than that of the conventional bakelite powder, and the proportion of the phenolic resin is higher than that of the conventional bakelite powder by about 10-15%, so that the composite material has higher fluidity and compatibility, more resin provides better adhesiveness and compatibility in the secondary reaction process with reacted thermosetting plastic waste (especially reacted bakelite powder particles), and the reacted bakelite powder particles with specific particle sizes provide better filling effect so as to improve the strength after reaction.

The above reactions are all chemical changes, the time consumption is long, and the proportion of the composite material and the reacted thermosetting plastic particles is as follows: 4 percent of reacted thermosetting plastic particles do not participate in chemical changes and only serve as fillers, and the theoretical reaction time is reduced by 40 percent compared with the forming speed of common materials.

Although the resin content of the formula is 10-15% higher than that of the common material, the addition proportion of the finished product material of the formula is only 60-70% in the actual mixing process with the reacted bakelite powder particles, the total consumption is reduced by 30-40%, the requirement on the consumption of raw materials is also reduced, and the formula is more environment-friendly.

Detailed Description

The invention discloses a method for treating thermosetting plastic waste, which comprises the following steps:

s1, putting the thermosetting plastic waste into a slow-speed rolling type crusher for crushing, wherein the rotation speed of the crusher is 150-;

s2, mixing the crushed thermosetting plastic waste and the composite material in proportion to form a mixture;

and S3, putting the mixture into an auger type cold press, mixing and granulating after cold pressing and stirring, wherein heating is not required in the process, and no waste gas pollution is caused.

Preferably, the thermosetting plastic waste includes, but is not limited to, phenolics, modified phenolics, dry unsaturated polyesters, melamine, urea formaldehyde.

The composite material is prepared from the following raw materials in percentage by weight:

50% -55% of phenolic resin;

10-40% of wood powder;

10-20% of mineral filler;

10-13% of urotropin;

0.5-2% of a coloring agent;

1-3% of zinc stearate;

1-3% of magnesium oxide;

the invention uses phenolic resin as adhesive, which can meet the requirements of the process on the indexes of resin softening point, viscosity, gel time, etc., and control the content of harmful substances such as free phenol, free formaldehyde, etc., so that the content of free phenol is less than 1 percent, and the invention can meet the indexes of phenol extract and aniline extract.

The invention uses wood flour as a reinforcing material, the fineness of the wood flour is 80-100 meshes, the water content is less than or equal to 10%, and the apparent density is 0.15-0.27 g/cm³Ash content is less than 3%. The wood powder is purified by citric acid, so that soluble impurities can be removed, and the index requirement of the total extract is met. The amount of the wood powder accounts for 10-40% of the weight of the phenolic molding compound which can effectively contain the reacted thermosetting plastic, but the mass ratio of 10-20% is relatively better.

The mineral filler used in the invention is toothpaste-grade aluminum hydroxide, which ensures good heat resistance, flame retardance and electrical insulation performance of the material, and the toothpaste-grade aluminum hydroxide raw material is treated at high temperature of 1200 ℃, so that the toothpaste-grade aluminum hydroxide has stable chemical properties.

The invention uses urotropine as a curing agent, and the particle size is 200-300 meshes. Urotropine itself belongs to a medium-toxicity chemical, ammonia is released in a curing reaction, so the dosage of the urotropine is strictly controlled to control the content of harmful substances such as free ammonia, and the excellent processing performance of the material is ensured to meet the requirements of an injection molding process.

The colorants of the present invention employ carbon black designated as manufactured by cabot corporation, usa. Carbon black produced by the company cabot, usa, has excellent blackness, strong tinting strength and excellent dispersibility and stability, and can meet the index requirements of total extracts.

The additive is lubricant zinc stearate and the curing accelerator is magnesium oxide, wherein the weight percentage of the addition amount of the zinc stearate is 1-3%, and the weight percentage of the addition amount of the magnesium oxide is 1-3%.

The preparation method of the composite material comprises the following steps:

s1, purifying the wood powder, immersing the wood powder into a citric acid solution with the weight percentage concentration of 3-4%, washing for 2-3 h, filtering, washing for 0.5-1 h with clear water, dewatering and drying;

s2, mixing the above raw materials with the wood powder purified by S1, plasticating, pulverizing and granulating.

The present invention is further illustrated by the following examples, but is not limited to the scope of the present invention.