CN102285022A - Regenerating method of waste plastic through resource modification - Google Patents

Abstract

The invention relates to a regenerating method of waste plastic through resource modification. The method comprises the following steps of: crushing and pre-treating the waste plastic, separating the waste plastic from metals, and cleaning and drying the waste plastic, wherein the step of cleaning the waste plastic mainly comprises a pre-cleaning step, a cleaning step and a bleaching step; modifying the waste plastic through colour mixture, namely adding 30 to 50 percent of TiO2 or CaCO3 to modify the waste plastic to regenerate a white master batch; modifying the waste plastic through blending, namely selecting styrene butadiene styrene (SBS) as an additive of polypropylene (PP), polystyrene (PS) and polyurethane (PE); and modifying the waste plastic through filling, namely reinforcing with glass fibres and carbon fibres. The regenerating method has the advantages of low carbon, no harm, reclamation and capability of reducing pollution.

Description

A kind of waste plastics resource modification regeneration processing method

Technical field

The present invention relates to the waste plastics recovery processing method, particularly waste plastics resource modification regeneration processing method.

Background technology

In current socio-economic development, plastics are because its unique character, penetrated in the national economy life various aspects, as a kind of material, shown its irreplaceable effect.From the sixties in last century, the emergence of modern petrochemical industry, it is rich and varied that the world has been stepped into, the prismy plastics epoch.Current, the activity in production of national chemical industry about 50% is carried out around the production of macromolecular compound.Synthetic material industry has become the main body of chemical industry, and plastics industry then is the core of this main body.The petroleum industry development of advancing by leaps and bounds has promoted the production of plastic product.Because plastics have premium properties such as light weight, intensity height, corrosion-resistant, easy processing, have obtained using widely in the national economy every field.But be accompanied by the expansion of plastics-production and application, the environmental pollution problem of waste plastics is also serious day by day, mainly shows the following aspects.

Though the shared ratio less than 2% of plastics in rubbish, but because its difficult decomposition and volume are big and irregular, be difficult to handle, thereby cause the social concern that ties up land and contaminated environment, many plastic products use once promptly discarded, can not make full use of, both pollute environment, also cause the significant wastage of social resources.

Because the hygienic habit that people's environmental consciousness is weak and good forms as yet for a long time, the environmental pollution of throwing out plastic refuse without care conveniently and being caused is startling.Can be broken after the employed plastic sheeting for farm use in wide farmland is aging, if cleaning is untimely, residual polyolefin plastic sheeting for farm use can make the arable land deterioration, makes cereal crops that the underproduction in various degree be arranged.

For this reason; to the processing of waste or used plastics with recycle the international social concern that has become aspects such as public health, environmental protection, the utilization of resources; oneself causes the extensive concern of national governments, scientific and technological circle and industrial quarters, and promotes to reclaim enforcement by means such as economy, legislations.

China's waste plastics recovery utilizes technology to pass through nearly 30 years exploration, and certain progress is arranged, and recycles enterprise and also begins to take shape.But the development limitation of technology is very big, and way of recycling is single, only possesses certain basis on fusion regeneration method at present, and at the thermal decomposition recovered oil, reclaim industrial chemicals, burn reclaim heat energy etc. utilize aspect progress slower.As for the sorting isolation technics of mixed waste plastic, fall behind especially, rely on the manual sorting basically.And, the processing enterprise that waste plastics recovery utilizes, the overwhelming majority is small business and township enterprise, even much is individual enterprise.Due to limited conditions, phenomenon such as the ubiquity technology falls behind, and production equipment is simple and crude, and quality of workers is poor, and product quality is low directly affects economic benefit of enterprises.China introduces the complexes of many fusion method regeneration processing and utilization waste plastics in succession from Japan, Germany in recent years, and Chinese waste plastics recovery utilization has been strengthened in the import of these equipment to a great extent.But from applicable cases, most of introducing equipment exists some problems, mainly shows: the apparatus value height, and generally there are problems in popularization; The energy consumption height has directly increased operating cost, and benefit is recycled in influence; Be not suitable for national conditions, because of domestic waste plastics kind, one-tenth grade with variant abroad, the utilization effect of equipment is affected.

The regeneration method and technology of waste plastics is less at present, and practicality is relatively poor.

Summary of the invention

Technical problem to be solved: the object of the invention has provided the modified waste plastics regeneration treating method of a kind of low-carbon (LC), harmless and resource.

Technical scheme: a kind of waste plastics resource modification regeneration processing method, method step comprises:

(1), waste plastics fragmentation and preliminary treatment: waste plastics and metal separation, waste plastics through clean, drying,

Wherein clean and mainly comprise: prewashing part, cleaning part, rinsing part;

(2), the resource modification regeneration to step (1) gained waste plastics utilizes: colour mixture modification, the TiO2 or the CaCO3 of interpolation 30%～50%, realization modified waste plastics regeneration white master material; Blending and modifying selects the additive of SBS as PP, PS, PE; Filling-modified, strengthen so that glass carbon is fine.

Effect of the present invention: efficient low-consume of the present invention can waste plastics resource modification regeneration technology, make waste plastics toughness, intensity after the modification all reach certain quality requirements, can be widely used in all trades and professions such as chemical industry, commodity, household electrical appliances.The regeneration rate of plastics is up to 95%.Technology is easy, simple to operate, collection cleaning, pulverizing, mixing, painted, modification is disposable carries out.Can reduce and pollute low-carbon (LC), harmless and resource.Improve value-added content of product.

The specific embodiment

Waste plastics fragmentation and resource isolation technics mainly are to carry out fragmentation at the electric appliance and electronic product casing after removing, and pulverize the sorting link for next step and lay the foundation.Main research and development content comprises: the influence that the waste plastics physical property is selected disintegrating machine; The waste plastics broken material of different classes of and different brackets is to the influence of accumulation sieving rate; Useless broken material granularity is to chemical composition analysis result's influence.The pretreating process of waste plastics: waste plastics, cleaning, drying, detection.Wherein purging system mainly comprises: prewashing part, cleaning part, rinsing part.This part mainly is the circulating and recovering technology in cleaning in the purging system, the control of separate impurities and plastics quality in the plastics, parameters Optimization.Product quality height after purging system cleans and scavenging period is short, efficient is high, energy consumption is low.

The resource modification regeneration technology of waste plastics: the modified waste plastics regeneration is the different modifier of characteristic adding according to different waste plastics, make it change into the useful materials of high added value, waste plastics is through after the modification, mechanical performance improves or improves, and can be used for making the higher plastic products of class.After modification technology is primarily aimed at different classes of waste plastics and detects by preliminary treatment character, carry out blending and modifying (inorganic filler blend, fiber reinforcement), toughening modifying or waste plastics is carried out modification according to its characteristic, make waste plastics be endowed higher shock resistance, good hear resistance, ageing resistance etc. by blowing agent.

Colour mixture modification: at engineering plastics such as PE, PP, PS,, add TiO2 or the CaCO3 of 30%-50%, add additive, realize modified waste plastics regeneration white or black masterbatch, thereby increase the added value of regenerated plastics by mixing, plasticizing, exhaust.Equipment is extruded unit, the soft water circulatory system, electrical system and interlocking joint control system by twin-screw metering feeding machine, twin-screw mixer and is formed.Granulate evenly, it is even to go out a color and luster.

Blending and modifying: by experiment, experiment radix etc. are added in screening, the modification of modifier, screening SBS is as the additive of PP, PS, PE, find through screening experiment, SBS has good solvability in varsol, dissolving is fast, good stability, cohesive force are strong, has avoided with the harm of aromatic hydrocarbon solvent to health.Add SBS adhesive better elastic, adhesive strength and cryogenic property.Select for use SBS as PP, PS, PE adhesive, can effectively improve the cryogenic property and the impact strength of goods.Belong to crystalline polymer at PP, and fusing point is close with NBR, therefore can strengthens its toughness by adding NBR.

Filling-modified, strengthen so that glass carbon is fine.

Claims (1)

1. waste plastics resource modification regeneration processing method, method step comprises:

(1), waste plastics fragmentation and preliminary treatment: waste plastics and metal separation, waste plastics are through cleaning, drying, and wherein cleaning mainly comprises: prewashing part, cleaning part, rinsing part;

(2), the resource modification regeneration to step (1) gained waste plastics utilizes: colour mixture modification, the TiO2 or the CaCO3 of interpolation 30%～50%, realization modified waste plastics regeneration white master material; Blending and modifying selects the additive of SBS as PP, PS, PE; Filling-modified, strengthen so that glass carbon is fine.