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Formulation and precautions of wood - plastic production process.

Formulation and precautions of wood - plastic production process.
The production of wood and plastic in China is usually made by two techniques (one-step method, two-step method), which can affect the production capacity, quality, stability, cost and so on. The stand or fall of equipment and the speed reducer, the screw design and machining precision of the gun barrel, the accuracy of temperature control, motor power configuration, the size of the stand or fall of frequency converter, finalize the design of Taiwan, lead to machine the size of the traction and stability and so on, for wood plastic foam products is key to the screw compression ratio and the structure of the thread.
Due to the hot current wood plastic products market, new and old manufacturers to horse, for cost reasons, many manufacturers directly to the extrusion of polyvinyl chloride (PVC) profiles of extruder for extrusion instead wood plastic profiles, generally basically can run normally, but due to differences in extrusion materials, there are still some problems.
The transformation of old equipment. Usually when wood plastic profile extrusion granulation, and a lot of extruder is designed according to the feed powder, if add the grain of fault, the crash could occur in this kind of situation usually transform feeding system can solve the problem.
The loss of equipment. Because of the existence of plant fiber raw materials will exist in certain organic acid and water, at the same time in the purchase of raw materials and recycled wood plastic products is likely to be in foreign body, the corrosion and wear and tear of equipment are visible.
Water vapor problem. Due to the raw material of plant fiber absorbent, extrusion will generate a certain amount of water vapor, if too much moisture, physical properties and appearance quality of products will have influence, so steam discharge ability put forward higher requirements for the host.
The difference in the number of extrusions. Wood - plastic products are more thick - wall or solid products, which puts more stringent requirements on extruders.
The difference in shear force. Different from extruded PVC profiles, extruded wood and plastic profiles require low shear and high transportation, which requires the screw design of extruder.
All in all, extruded wood extruder must be used for special extruder or modification and improvement of existing extruder.
The design of the mold is as large as possible with a large compression ratio and a longer shaping section which is conducive to foaming and improving the surface of the product and the hardness.
1. Raw materials for PVC wood (resin, auxiliaries, fillers, fiber selection and addition quantity and raw material production process).
1. The resin is better to use SG-7 to facilitate the formation and stability of foaming.
2. Auxiliaries (stabilizers, lubricants, foaming agents, foaming regulators, coupling agents, toughening agents, processing AIDS.
1) stabilizer:
Compound lead salt stabilizer: the advantage is that the thermal stability is good, has the weathering function, the disadvantage is poisonous and not environmental protection, the dispersity is poor in the processing, it is difficult to maintain the excellent physical property of the product. The manufacturer will produce different kinds of stabilizers for different lead content in the production of PVC (PVC hard products, pipes, profiles, sheets). The lead content of compound lead salt stabilizer should not be less than 30%. In order to process the compound lead salt stabilizer, we need to add some lubricant (stearic acid, paraffin, PE wax). Pe wax, etc., is used for the production of wood plastic foaming. It is better to add oxidized Pe wax to adjust the formulation and not to affect the quality of the product (with good lubrication). Dosage according to the processing method and equipment of the old and new, the size of the screw, the stabilizer is determined, generally add 4-5%. Must not be used for transparent products, with sulphur pollution, do not mix with organic tin.
Organic tin stabilizer:
The advantage is that the thermal stability can be used in transparent products, with little addition, low toxicity, and disadvantage is high price, because it is liquid transportation and use a little inconvenient. Generally, it can be used to reduce the amount of organic tin and reduce the cost.
Calcium and zinc stabilizer:
Is a non - toxic environmental protection new heat stabilizer has liquid and powder two kinds, the disadvantage is that the thermal stability is poor adding quantity, good lubricity.
Domestic wood - plastic production is mostly used as a compound lead salt stabilizer due to the cheap. However, as wood plastic environmental protection material is a little deviation from the environmental protection purpose, and the adjustment of the formulation and the stability of product quality have certain influence. The more the stabilizer is not the better it has the best addition, less thermal stability, more impact plasticization and product physical properties.
2) lubricant:
The selection and combination of lubricants and their dosage, the balance of internal and external lubrication and sufficient lubrication in the middle and late stage are the key to ensure the normal production of wood plastic. There are many kinds of lubricant, such as stearic acid, paraffin, PE wax, oxidized PE wax, stearic acid salt, single lipid, PETS, EBS, etc., some of which are within the slip agent, lubricating agent, some is the early stage of the lubricant, some of them are late lubricant, but they are in different processing temperature can be mutual conversion. Different machines have different dosage of lubricant, single screw is more than double screw dosage and inside and outside the smooth side key is different also, device the size of the old and new, and the dosage is different also, the dosage of the products in the shape of a simple slip inside and outside is different, different dosage of stabilizers, slip agents are not the same as (some stabilizers have lubricity, some do not). The number of lubricants affects the production stability and continuous production cycle, product appearance, product foaming and mechanical indicators.
3) foaming agent:
Wood plastic products mold base design is adopted for luca type which is beneficial to improve the foaming ratio and hollow products production, so I suggest the MSV - 206 foaming agent, the thermal deformation, weather resistance, environmental protection, etc. To demand higher sheet, profiles, tubes and the development of a modified foaming agent, gas evolution slightly smaller than the AC, but break down completely, to improve the rigidity of products, d CARDS are helpful. It is slow to decompose and the surface of the extruder is quickly cooled, which helps to form the porous structure of the compacted surface, which is suitable for the seka and the froth.
4) foam regulator:
The density of wood plastic products according to different usage scenarios density size are not the same as those generally at about 0.7 to 0.8, so commonly used K125P can meet the requirements, its molecular weight is controlled in 5 million, such as with higher molecular weight regulator on the foaming is helpful but it will reduce the rigidity of the products. The usual dosage is 6-8 copies.
5) the use of coupling agent to improve the compatibility of fiber and inorganic filler in order to improve the mechanics index of the product and reduce the bibulous rate of products, I suggest using JR300 its usage is the sum of fiber and filler 1.5%, its price is moderate dosage and performance equivalent to that of silane coupling agent. And it is a solid powdery substance weighing and adding convenience.
6) toughening agent:
In the wood plastic products, I recommend not to add or reduce the elastomer toughening agent, because the elasticity will affect the related performance of the products.
7) processing AIDS: not added.
3. Filler and fiber.
The variety of fillers (light calcium carbonate, heavy calcium carbonate, active calcium carbonate), talcum powder, wollastonite, kaolin, etc. (500 eyes, 800 eyes, 1000 eyes, 1250 eyes, etc.). The choice of fibers (wood powder with hardwood lumber, coniferous wood powder, miscellaneous wood powder, pine powder, rice bran powder, straw, peanut shells, etc.), the selection of fiber mesh PVC wood-plastics fiber mesh generally use about 80-120 mesh, PP, PE in general use around 60-80 mesh. The combination of inorganic fillers with different appearance shapes can help improve the mechanical properties of the products. Filler and fiber content determines the quality of products and density, high density and poor quality not only increase the wear and tear of the screw and barrel shorten the service life of equipment, such as improper operation formula adjustment does not reach the designated position are more likely to make the screw fracture, but the cost will be low. I suggest that the production of PVC ecological wood 100 kg PVC plus quantity control at 40-70kg can be controlled at about 0.7-0.8.
3. Production process of raw materials:
Wood fiber is the strong water imbibition water content in 15% or more commonly, inorganic filler is around 5%, and the water content of high and low is especially wood plastic production stability and product quality of predators, such as impact foaming ratio, the bibulous rate of products, products, the deformation of the products of weather resistance and other physical properties. So water is best kept within 1%.
Reasonable control the moisture content of fiber and packing -- -- -- -- -- to join high mixing machine -- -- -- -- -- in the mixing to 100 degrees -- - to join the right amount of coupling agent, mixed to 110-110 degrees, turn off the motor motionless mixer big open 2-3 minutes -- -- -- -- -- add PVC, stabilizer - mix to 80 degrees -- -- -- -- -- add lubricant additives and other -- -- -- -- -- 100 degrees and processing AIDS, foaming agent -- -- -- -- -- - 120-125 discharge powder -- -- -- -- -- after unloading the motor stopped to open the big cover for 2-3 minutes and then mix the firsthand material (best mix five hand cleaning a mixer) -- -- -- -- -- powder in ling stir barrels made to 40 degrees to granulation or join a twin-screw production (ling ling mixing barrel must have a cycle is water). In mixing is must pay attention to observe temperature and time, such as general ling kettle mixed material in 20 to 25 minutes or so, hot pot in 12 to 15 minutes or so set temperature (125 degrees), if there is a difference time 3 minutes or more that could be the heat line or temperature control, or mixer horn knife badly worn. This will affect the stability and color of the foaming rate.
Granulation often pay attention to the temperature control is accurate temperature, fan is normal operation, the current size, particle size, surface, whether the length of the adhesive material, the cutting is stable, don't be expected to happen.
4) extrusion process:
Pay attention to the following aspects.
A, the setting of the temperature of the extruder, the key is compression section, metering section, mold. The accuracy of each temperature control should not affect the foaming ratio and color. Foaming is mainly the setting of the temperature of compression section and metering section, forming the mold temperature.
B. The normal operation of the fan.
C, the size and stability of host current. If the host current fluctuates a great deal, the lubricant is not very evenly distributed between the fiber and PVC components.
D, the main engine speed must be kept the same, because the speed of the speed will affect the foaming ratio and color.
E, the temperature of the dryer is generally set between 60 and 80 degrees, and it is often kept at about 80% of the volume of the barrel, which is conducive to the stability of production and color to improve the quality of products.
F, different color of the machine, the length of the gel storage time and other production temperature Settings are different. In addition, wood plastic foaming is affected by the external environment and other factors. Therefore, the operator should be able to adjust the industry properly when different products are abnormal.
Technical problems urgently needed to be solved in wood-plastic products:
Product shrinkage, deformation, surface hardness, weather resistance. I think it should be considered from the selection of raw materials (resin, fiber, inorganic filler, lubricant forming industry) and mold design. The weatherability can also be done after processing.
Basic formula of PVC profile:
The serial number
Commodity code
use
Recommended dosage KG
Price is RMB/KG
1
PVC
50
2
CACO3
25
3
Wood powder
10
4
YQ102
Mixure Stablizer lead stabilizer.
2
5
MSV - 513.
Yellow Blowing agent Yellow Blowing agent.
1.5
6
K - 268.
Processing Aid Processing Aid.
3.5
7
CP - 1
Processing Aid Processing Aid.
2
8
LH - 708.
Lubricant lubrication
1.2
9
CPE
Processing Aid Processing Aid.
1
10
PE idea
Lubricant lubrication
0.3
11
AC6A
Lubricant lubrication
0.2
The addition of wood powder and calcium powder is based on the quality of different products and products made by the customer. It is only the basic formula, which can also be added to the products and costs by adding some PVC hard materials or foaming materials.
Note: A. This formula is: 1, have coupling toughening function, can increase mechanical properties of the material, to improve the rigidity and thermal deformation of product specific help, can be used in the family the wood plastic products and higher requirements for the thermal deformation of products. 2, toughening agent CPE products good toughness. 3. Excellent thermal stability, weatherability and anti-ultraviolet function; 4. With the compatibility of resin and good dispersibility, it can improve the production speed and improve the surface gloss of products; 5. Anti-fog and anti-static function. 6. It is applicable to the production of wooden and plastic skirting line, door set line, windowsill line, ecological wood, hollow board, floor, stair armrest, breathable window, micro-foaming cabinet board, wave board and other products.
B. production of different products and different ways of production, such as gait and ldpe-g-nvp) and adopt different stabilizer, can according to the cost and quality of the products of different fillers and additives on the corresponding adjustment.
C. According to the product density in the production, some other modifiers can be appropriately added so that the surface hardness and rigidity of the products are better.
The basic formula of PVC sheet is as follows:
The serial number
Commodity code
Product use
Recommended dosage KG
Recommended dosage KG
Price is RMB/KG
1
PVC
PVC type 7
50
75
2
PVC
PVC type 5
25
0
3
CACO3
Light calcium carbonate.
45.00
30.00
4
Wood powder
WOOD,
15
0
5
K278P
Processing Aid Processing Aid.
8.00
7.00
6
MSV - 206.
Yellow Blowing agent Yellow Blowing agent.
0.60
0.50
7
3316 a
Lubricant lubrication
0.35
0.50
8
AC6A
Lubricant lubrication
0.40
0.40
9
YQ101A
Mixure Stablizer lead stabilizer.
3.5
2.8
10
1801
Lubricant lubrication
0.3
0
11
CP - 1
Processing Aid Processing Aid.
1.5
0
12
The G60 will be
Lubricant lubrication
1
0.7
13
R258
Titanium dioxide Titanium oxide (Ⅳ)
2
1.5
14
OB - 1
Fluorescent Whitening Agent, Whitening Agent
0.05
0
15
CPE
Processing Aid Processing Aid.
2.5
4.5
This recipe has the following characteristics:
 improve packing (wood powder, chaff powder, inorganic) dispersion. Small amount of added, used to extrude to about 2.0%, used for injection molding ratio increased by 10-30%.
 increase mechanical properties of the product, such as flexural strength, flexural modulus and impact strength, etc., to reduce the moisture content and water absorption, impact strength than lubrication system with stearic acid, paraffin, PE wax high 400-800 cows, bibulous rate is low 30%).
 improve the stability of production, reduce torque and plasticizing temperature.
PE basic formula is as follows:
The serial number
Commodity code
use
Recommended dosage KG
Recommended dosage KG
Price is RMB/KG
1
Back to the PE material
35
35
2
CACO3
10
5
3
Wood powder
60
70
4
LEPH
High efficiency compound adhesive.
4
5

LEPH high efficiency composite adhesive: for PE wood plastic material products for the development of a processing aid, the use of this product formula can greatly increase the production extrusion speed and increase the product compressive strength.
Application: applicable to all extruded PE wood molding process products.
The formula is simple and stable with smooth surface and hard.

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