application

Raw material composition and properties of PVC wood plastic.

PVC tree powder and wood fiber and inorganic filling (calcium carbonate), lubricant, stabilizer, foaming agent, foaming regulator, toner and other related additives (plasticizer, toughening agent, coupling agent), etc.

1, resin domestic SG-7, SG-7 resin fluidity is good for foaming, but also to reduce the cost of mixed SG-5 type.

2. The filling is basically wood powder (generally about 80-120 mesh of wood powder and more poplar wood powder), and the calcium carbonate is more light calcium carbonate (800-1000-1200 mesh).

3, lubricants generally use stearic acid, paraffin, PE wax, calcium stearate and other combinations according to the required proportion to constitute the wood plastic lubricant system. Stearic acid, paraffin cheap good lubrication performance, its disadvantage is the low melting point (more than 50 degrees), low melting point of the lubricant in giving lubricity also have the effect of plasticizer, such influence the rigidity of the products, product d card and thermal deformation temperature low products along with the temperature, easy to deformation and easy to precipitate affect production. If PE wax is 100% pure, the melting point can reach more than 100 degrees will not reduce the vica of the product, and can form a layer of dense high temperature wax film on the surface of the product, so that the surface brightness of the product is more prominent. Calcium stearate can accelerate the plasticization of materials and has a certain stability effect.

4, stabilizer, used for PVC production of stabilizer compound lead salt stabilizer, organic tin, calcium zinc stabilizer, etc. The stabilizer commonly used in wood plastic in China is composite lead salt stabilizer, which has the advantages of cheap price and good thermal stability. The disadvantage is toxic and not environmentally friendly. However, the proportion of composite lead salt stabilizer lubricant is about 50%. The stability effect of calcium and zinc heat stabilizer is worse than that of lead salt stabilizer, but it is environmentally friendly and non-toxic. In order to improve the performance, calcium and zinc stabilizer is generally combined with antioxidant and high temperature wax, stearic acid, etc., which is made into a multi-functional, multi-purpose and high-efficiency PVC processing assistant by special process. It is suitable for the production of environmentally friendly PVC products and high-fill products. It is an excellent heat stabilizer and processing assistant for wood – plastic products. A:

1. Comply with EU ROHS directive and PAHS regulations;

2. In the same resin under the premise of comparable organic tin and lead salt stabilizer appropriate increase the amount of filler.

3. The initial tinting property is similar to organic tin, organic tin has peculiar smell, calcium and zinc stabilizer has no peculiar smell.

4. The processing performance is better than organotin and lead salt stabilizer, because it belongs to stearic acid soap, relatively fast plasticization.

5. The density of calcium and zinc stabilizer is comparable to that of PVC resin, so its dispersion is better than that of organotin and lead salt stabilizer, which is more conducive to its dispersion in resin;

6. Can improve the surface finish of products;

7. Good thermal stability and initial colouring.

8. Add slightly more than the same price lead stabilizer

5, the blowing agent is generally used with AC blowing agent and white blowing agent. Advantages of AC foaming agent is big hair volume, the amount is small, the disadvantage is that incomplete decomposition will remain a small part in the products, in use process will be apparent absence made to product, foaming agent to product surface spots and absence made products endure-climate property can accelerate ageing, release a large amount of heat decomposition, cause decomposition of products change color, white is endothermic foaming agent and foaming agent Appropriate addition can well neutralize the excess heat released by the decomposition of AC blowing agent, so that the product color is more pure.

6, foaming regulator is generally selected double class A high viscosity regulator, double class A regulator (such as HF-100/200/80, etc.) not only weather resistance is superior, but also has excellent plasticizing performance, make the product surface more compact, better gloss. The addition of foaming regulator can accelerate plasticization and save energy consumption at lower temperature. Foaming regulator can better adjust the uniformity and density of foam holes, effectively reduce the density of wood plastic foam products. Now, in order to reduce costs, many wood plastic manufacturers choose to use a lot of small pipe material, plastic materials such as waste production wallboard, the line that play a base, such as wood plastic products, secondary material plasticizing back faster than new material a lot, with a relatively low melt strength, in order to product performance better, can choose plasticizing slower melt strength of foam regulator (such as HF – 80/901) effect is better, Of course, the price will be higher than the HF-100 series.

7, suitable for ecological wood color powder yellow, red, black, titanium dioxide and so on. Yellow and red colorants are inorganic and organic. The advantage of inorganic toner is that it is better than organic toner in weather resistance and resistance to migration and high temperature. The disadvantage is that the amount of inorganic toner is large, which is not suitable for bright colors, but the price is cheap. Organic toner on the contrary. Ecological wood is generally used in combination with organic and inorganic toner. Titanium dioxide has rutile type and anatase type two. Rutile type covering power and weather resistance is better than anatase type, so ecological wood generally with rutile titanium dioxide.

8, CPE, generally choose 135A type, is currently the most cost-effective toughening modifier on the market, appropriate addition can make wood plastic products with better toughness, but the amount of soft products after more, pay attention to adjust the amount of use.

9. DOP and epoxy soybean oil are commonly used for PVC ecological wood plasticizer. DOP can reduce the intermolecular force of resin to improve fluidity, and has a certain lubricity conducive to production and processing. But it can reduce the vicar of the product. One kilogram of DOP can reduce vicar by 3 degrees. The plasticizing effect of soybean oil is not as good as that of DOP, but it has certain thermal stability, which will also reduce the vica of the product. Therefore to the use of plasticizer should be all the more cautious.