At present, on the one hand, the aggregate consumption of China's paper industry occupies the third place in the world, in paper-making process, produces a large amount of waste sludge from paper mill, and the environmental influence that these waste residues brought becomes increasingly conspicuous, and various ecological problems of the consequent and social concern also highlight gradually.On the other hand, along with the development of China Plastics Industry great-leap-forward, waste or used plastics is more and more serious to " white pollution " of environment, inevitably will be in the face of the recovery of waste or used plastics and the problem of comprehensive utilization.On the one hand, current again, timber resources is tired, and the building materials demand is huge, is the limited timber resources of protection China, must the suitable substitute of exploitation.
Wood plastic composite is meant that with biomass powder (wood powder, agricultural stalk powder etc.) be packing material; Use means such as filling remodeling or polymer chemistry; With thermoplastics fusion, kneading, mixing; Extrude through HTHP again, cool off and a kind of reversible quality matetrial that follows bad utilization of machine-shaping.The dual nature of these composite material concurrent plastics and timber has the advantage such as water-fast, anticorrosion, disease and insect resistance, easy coloring of plastics, and xyloid sense organ is more arranged, and can cut as timber, cuts, bores, follows closely, secondary processing such as plane.Be widely used in industries such as building, furniture, gardens, logistics, traffic and shipping vehicle.
Through retrieval to existing wooden molding technology; One of main raw material of wood plastic composite is biomass powder (wood powder, an agricultural stalk powder etc.); Along with wood is moulded the continuous development of industry, the biomass powder will be in great demand gradually, so production cost also will raise; In order to reduce production costs, can the papermaking solid waste to be applied to wood and to mould production.
Summary of the invention
The object of the invention is exactly to utilize problem again for what solve waste sludge from paper mill and waste or used plastics; The protection biomass resource; A kind of prescription and the method thereof that can utilize waste sludge from paper mill and waste or used plastics to produce wood plastic composite is provided, will through pulverizing with sorting after the papermaking solid waste as starting material, replacement biomass powder is used for the production of wood plastic composite; Papermaking solid waste and thermoplastics, coupling agent, lubricant etc. are mixed; Mixing, granulation and extrusion moulding obtain wood plastic composite, select nontoxic auxiliary agent for use in the preparation process, reach environmental requirement.
The object of the invention is realized through following proposal:
A kind of prescription that utilizes the papermaking solid waste to prepare wood plastic composite is characterized in that, comprises the raw material of following parts by weight:
Said papermaking solid waste is the commercial goods, on market, is easy to obtain.It generally includes get the raw materials ready white clay, wastewater treatment mud and secondary stock between waste residue, alkali recovery vehicle of raw material in the primary slurry production and utilizes the deinked sludge that produces in the process, screening waste residue etc.(" China's papermaking solid waste is handled present situation and trend " Tang Zhichao " Chinese paper industry " the 31st volume 6-10 page or leaf in September, 2010 the 18th phase has detailed description to this.)
Said recovery plastics refer in purposes such as civilian, industry, the plastics that used and finally eliminated or replace and made through the discarded goods that clean and pulverize.The recovery plastics that the present invention uses are the commercial goods.
Among the present invention, described papermaking solid waste is the 60-80 order through pulverized particles, and water cut is less than 2%; Polyolefins plastics such as described recovery plastics preferably polyethylene, Vestolen PP 7052; Described coupling agent is the EMA anhydride copolymer, proportion 0.940g/cm
3, melting index 25g/10min, 108 ℃ of fusing points; Described calcium-zinc composite stabilizing agent is calcium stearate and Zinic stearas one package stabilizer, and wherein the mol ratio of calcium stearate and Zinic stearas is 2: 1; Described lubricant is the fatty acid ester mixture, and outward appearance is a saccharoid, 67-77 ℃ of drippage point, proportion 1.005g/cm
The tinting material of technology amount can also be included in the present invention's prescription, chromatic wood-plastic products can be obtained like this.
A kind of method of utilizing the papermaking solid waste to prepare wood plastic composite is characterized in that, comprises the steps:
1) by weight proportion papermaking solid waste particle 40-70 part, recovery plastic grain 30-60 part, coupling agent 0.8-2 part, calcium-zinc composite stabilizing agent 3-5 part and lubricant 0.6-6 part are added high-speed mixer and mixing; Mixing temperature is 105 ℃-110 ℃, and mixing time is 15-20 minute;
2) raw materials mixed is added parallel double-screw extruder and carry out mixing granulator; Forcing machine main frame temperature is between 165 ℃-180 ℃, and rotating speed is 60-80 rev/min, and the feeding machine rotating speed is 8-10 rev/min; Extrusion machine fused mass pressure 3-8MPa; 180 ℃ of head temperatures, extruded velocity 300Kg/h extrudes the back pelletizing;
3) the Wood-plastic material particle after the granulation is joined the conical double screw extruder extrusion moulding; Extruder temperature is between 155 ℃-170 ℃; Rotating speed is 40-50 rev/min, and the feeding machine rotating speed is 4-5 rev/min, 155 ℃ of head temperatures; Extruded velocity 800mm/h extrudes back typing cooling and can obtain wood plastic composite.
The mould of installing on the conical double screw extruder is different, and the material section that obtains is just different, selects mould as required.
The wood plastic composite that present method is produced be with papermaking solid waste particle, to reclaim plastics (Vilaterm) be main raw material; Through adding various functional agents; Granulation in parallel double-screw extruder, extrusion moulding in conical double screw extruder then, it has following characteristics:
(1) one of product main raw material is the papermaking solid waste, wood fibre is required low, and what can fully solve the papermaking solid waste utilizes problem again.
(2) product is that smooth surface is smooth, can carry out processing such as wire drawing, sand milling, embossing.
(3) cross section structure of product is evenly fine and close, and the defective of no timber-work is like knot, diagonal lamination etc.
(4) product has good physical and mechanical property, water-fast, acid and alkali-resistance.
(5) product can add various tinting materials, processes colour according to demand.
(6) the product workability is good, can follow closely, bores, saws, digs, bonding etc.
(7) product can be recycled, and the life-span is long, and cost performance is high.
Said material and goods thereof have the advantage of timber and plastics concurrently, can be widely used in industries such as building, industry, gardens, transportation, packing.
One of raw material that present method adopted is that the papermaking solid waste is one of three wastes of domestic paper industry, and two of raw material is to reclaim plastics, and two big main raws all are waste and scraps; Account for 90% of starting material total amount; Cheap, and help protecting environment, practice thrift timber resources.The auxiliary agent that present method adopted is most of for nontoxic product, and is very little to human body and environmental hazard in material produce and use.
Embodiment 1-3: prescription (unit: weight part)
|Papermaking solid waste particle
|Calcium-zinc composite stabilizing agent
Wherein, reclaim plastics for reclaiming Vilaterm, papermaking solid waste grain graininess is the 60-80 order, and it is dried in drying baker earlier, and moisture content is below 2%.
Embodiment 4: method for making
1) prescription according to embodiment 1-3 adds the high mixer mixing with papermaking solid waste particle, plastic grain, coupling agent, calcium-zinc composite stabilizing agent and lubricant etc., and mixing temperature is 105 ℃, mixes 15 minutes.
2) raw materials mixed is added parallel double-screw extruder and carry out mixing granulator, forcing machine main frame temperature is at 165 ℃, 170 ℃, 170 ℃, 180 ℃, and rotating speed is 60 rev/mins; The feeding machine rotating speed is 8 rev/mins; Extrusion machine fused mass pressure 3-8MPa, 180 ℃ of head temperatures are extruded the back pelletizing.
3) the Wood-plastic material particle after the granulation is joined the conical double screw extruder extrusion moulding, extruder temperature is 40 rev/mins at 155 ℃, 160 ℃, 165 ℃, 155 ℃ rotating speeds, and the feeding machine rotating speed is 4 rev/mins, extrudes back typing cooling.
Change the papermaking solid waste in the proportioning into powdered rice hulls and compare test.
The flexural strength of implementing 1-3 is following:
Hence one can see that, the impurity component in the papermaking solid waste influenced itself and poly compound, but the amplitude that intensity reduces is little, explains that the papermaking solid waste can prepare wood plastic composite as filler as vegetable fibres such as rice husks.