JPS5953546A - Vinyl chloride resin composition for synthetic wood - Google Patents

Abstract

PURPOSE:To obtain titled composition of good processability, free from and adherence to the inner surface of extruder and from heat decomposition due to the frictional heating in it, by incorporating a vinyl chloride resin by specific polymerization degree with woodmeal and a lubricant selected from higher fatty acids and polyethylene waxes. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100pts.wt. of a vinyl chloride resin with a polymerization degree of 500-1,300, with (B) 10-100 (pref. 15-85)pts.wt. of woodmeal and (C) 3-10 (pref. 4-8)pts. wt. of a lubricant selected from higher fatty acids (pref. stearic acid) and polyethylene waxes with a molecular weight <=7,000.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin composition,
Specifically, it is a mixture of vinyl chloride resin, wood flour, and at least one lubricant selected from the group consisting of (A) higher fatty acid-Kitasea = (B) polyethylene wax with a molecular weight of 7,000 or less, and has excellent moldability. The present invention relates to a vinyl chloride resin composition for synthetic wood.

When wood flour is mixed with vinyl chloride resin and extrusion molding or injection molding is performed, resin components such as rosin contained in the wood flour separate and precipitate, causing damage to the inner wall of the cylinder of the extruder, the surface of the screw, the inner wall of the die, etc. The phenomenon of deposits containing vinyl chloride resin and wood powder is often observed.

If this phenomenon progresses further, not only will the surface of the product become rough, but the deposits will thermally decompose, making it necessary to continue manufacturing for a long time.Q'! -It has become a disconnection.

A mixture of vinyl chloride resin and wood flour has a high viscosity, so it generates a lot of heat due to shearing force and friction heat. Prone to thermal decomposition.

As a result of intensive investigation with the aim of solving the peculiar phenomenon θ) during molding of the above-mentioned mixed composition of vinyl chloride resin and Kinuma, we determined that the degree of polymerization was as follows: We have discovered that this problem can be solved by using a lubricant, and have arrived at the present invention.

According to the present invention, the IF polymerization degree is 500 to 1300θ)
LM vinyl resin 100 parts by weight, wood flour 10-100 parts
Based on the weight part and the resin, (A) higher fatty acid, <:r
By mixing 3 to 10 parts by weight of at least one lubricant selected from the group consisting of polyethylene waxes with a molecular weight of 7,000 or less, the adhesion to the walls of cylinders, dies, etc. described above can be achieved. It is possible to prevent the heat content of vinyl acetate resin by roughly suppressing the heat caused by abrasion and wood powder.

The vinyl chloride resin referred to in the present invention refers to polyvinyl chloride and copolymers mainly composed of vinyl chloride, such as vinyl chloride-vinyl acetate copolymers, vinyl chloride-ethylene copolymers, etc. It is a graft copolymer of ethylene-vinyl acetate copolymer and vinyl chloride, etc., and its degree of polymerization is 500.
It is preferable to use water in the range of 1300 tons to 1300 tons. However, if the degree of polymerization of the vinyl chloride resin used is less than 500, the strength is weak and cannot be used in practical use.
If it is 0 or more, the melt viscosity is too high and molding becomes difficult.

The wood flour used in the present invention is not particularly limited depending on the type of the raw wood, but IuJ cutting sawdust, senma sawdust, etc. of water consumables, wooden boards, plywood, particle boards, etc. are used. Use of wood flour) j4 is vinyl chloride resin 10
In the 0-fold clear section: M'=J l, 1 (1 to 100
If the amount is less than 1 part by weight, the wood texture of the product obtained by mixing wood flour will not be sufficiently expressed, and if the amount is less than 100 parts by weight, the product will become brittle and cannot be used in practical use.
ii1 Enakupu 5C, Ru5. Rho, stearic acid, behenic acid, lauric acid, etc. are used as higher fatty acids, which are one of the lubricants used in the present invention, and among them, stearic acid is used. The polyethylene wax used in the present invention is, for example, Hoechst wax PΔ-1
90 (manufactured by Hoechst Jano-kun), ... Iwax 2
], 01 [manufactured by Mitsui Petrochemicals Co., Ltd.] AC-polyethylene-5
A (manufactured by Allied Cheminonol Co., Ltd.) J
'L.

General higher fatty acids such as 11-1 and tx-containing lubricants such as polyethylene wax can be used, for example, in hard vinyl chloride resin (2001). , J 1., +) , 1
It is added in the range of ~2.0 parts by weight, 1),
If it is added in excess, it will become too slippery, causing phenomena such as dripping (due to insufficient gelation of the fi1 fat) or the resin slipping inside the extruder, making extrusion impossible. However, according to the findings of the misfits, a unique phenomenon in compositions made by mixing wood flour and vinyl chloride resin is that even if a large amount of the lubricant is added, the lubricant does not become excessively smooth, and on the contrary, extrusion It has been found to be highly effective in preventing tar components in wood powder from adhering to the interior walls of the machine and suppressing heat generation in the resin, making it possible to obtain good products.

The amount of the above-mentioned lubricant used varies depending on its type, combination, and wood flour mixture, but usually vinyl chloride resin 1
．． 00 parts by weight: 10 parts by weight, preferably /
1 to 8 parts by weight is suitable. If the amount is less than 3 parts, either or both of the tar prevention effect in the wood flour and the heat generation prevention effect of the resin will be insufficient, and a method is generally adopted in which the amount of the lubricant increases as the l content of the wood flour increases. However, even in that case, the effect is already sufficient if 10 parts by weight is added.

In addition, in the resin composition of the present invention, stabilizers, fillers, processing aids, modifiers, coloring agents, lubricants other than the above lubricants, etc., which are usually added to vinyl chloride resins, may be added as necessary. Ru・−、
, 31- can be done.

11 [Method for producing acid and molded product from the composition of the present invention: ? The second method is the same as the conventional method for producing a composition of hard vinyl chloride resin and the method for obtaining a molded article, and for example, the composition of the present invention is produced by mixing the raw materials with a super mixer. Then, extrusion molding with a single or twin screw extruder using the blended powder,
The mixed powder is once made into pellets, and the pellets are extruded.7. ．． ) method etc. are used.

As explained below, according to the method of the present invention, resin components do not stick to the inner wall of the die, the sill, etc. (and the decomposition of wood powder and resin can also be prevented, so it is possible to easily form synthetic wood assemblies. It is possible to perform molding processing.

Next, the present invention will be further explained with reference to Examples.

Example 1 60 parts of wood flour, 2 parts of dibutyltin dimale-I, 1 part of dibutyltin mercaptide, 2 parts of epoxidized soybean oil and 6 parts of stearic acid were added to 100 parts of polyvinyl chloride (degree of polymerization 1(1)). The mixture was blended using a Henschel mixer. This blended powder was made into pellets using an extruder with a built-in full-flight screw of 40 mm in diameter and 93, and the pellets were made into pellets with a thickness of about 3 mm and RLJ of about 30 using the extruder described above.
It was molded into a mrn flat plate.

The obtained flat plate had a smooth surface with a woody feel. Furthermore, no deposits were observed on the inner wall of the die, screws, etc.

Example 2 For 100 parts of polyvinyl chloride (degree of polymerization 1050),
25 parts of wood flour, 4 parts of tribasic lead sulfate, 1 part of dibasic lead stearate, and 4 parts of polyethylene wax with a molecular weight of 1500.
The mixture was blended using a Henschel mixer, and pelletized and extruded into a flat plate using a 40 mm x 1 extruder in the same manner as in Example 11.

The obtained flat plate was a good plate with a smooth surface, and there was no adhesion of substances on the inner wall of the die or the surface of the screw.

Example 3 50 parts of wood flour, 4 parts of tribasic lead sulfate, 1 part of dibasic lead stearate, 1.5 parts of octyl alcohol and 4 parts of lead stearate to 100 parts of polyvinyl chloride (degree of polymerization 80n) were blended using a Henschel mixer, and pelletized and flat plate molded in the same manner as in Example 1. The obtained flat plate was a good plate with a smooth surface, and no deposits on the dice, scratches, etc. were observed.

Comparative Example: To 1.00 parts of polyvinyl chloride (degree of polymerization 800), 30 parts of wood flour, 4 parts of tribasic lead sulfate, 1 part of dibasic lead stearate, and 1.5 parts of lead stearate were added to Henschelmi.1.
When the mixture was blended in a thermal oven and converted into pellets in the same manner as in Example 1, gas was generated due to the decomposition of the wood flour, and only pellets containing a large amount of air bubbles were obtained. In addition, deposits were observed on the inner wall of the die and the tip of the screw. Using this pellet, a flat plate was molded in the same manner as in Example 1, but a plate with a smooth surface could not be obtained, and there were many needles (=J) of stuck substances on the tip of the screw and on the inner wall of the die.

The above results are summarized in Table 1.

-3 scarcity (3-

Claims (1)

[Claims] 100 parts by weight of vinyl chloride resin with a degree of polymerization of 500 to 1300, 10 to 100 parts by weight of wood flour, and A to the resin.
A vinyl chloride resin composition for synthetic wood having excellent moldability, comprising 3 to 10 parts by weight of at least one lubricant selected from the group consisting of (B) higher fatty acids and (B) polyethylene waxes having a molecular weight of 7,000 or less.