JP2587691B2 - Extrusion molding materials based on vinyl chloride resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application> The present invention relates to a material used for a non-rigid, extruded vinyl chloride resin having substantial spring-like elasticity, and in particular,
From the viewpoint of minimizing seasonal fluctuations in assembling workability such as flash mount molding, it is expected that the change in elastic modulus based on temperature difference is small, and the elastic recovery of deformation received during product assembly and transportation is good. It is a molding material suitable for a resin extruded product which is required.

In this specification, "parts" indicating a blending unit means "parts by weight" unless otherwise specified.

<Prior Art> Here, as shown in FIG. 1, a flash mount molding (hereinafter simply referred to as “mall”) is engaged with a fixed window plate 21, a sheet metal window frame 23, and outer side surfaces 21a, 23a of each vehicle. And a leg 3 extending in the orthogonal direction from the rear surface of the intermediate portion of the molding main body 1, and formed on both sides of the distal end of the leg 3, respectively. Window glass) engaged with the inside surface 21c of the vehicle 21 or the sheet metal window plate 2
A description will be given by taking an example of a configuration including two pieces of holding fins 5 and 6 that are pressed against the inner peripheral surface 23b of No. 3, but the present invention is not limited to this.

When the molding is made of a vinyl chloride resin, the molding material is extruded using, for example, a compounding formulation as shown in Comparative Example 1 in Table 1 and extruded to a predetermined length. After cutting, they were connected by molding or the like.

The manner of assembling the molding thus manufactured is as follows.

After the window glass 21 is disposed on the sheet metal window frame 23 in which the dam 30 and the sealant 25 are disposed on the bottom wall 23c, the molding body 1 is forcibly pressed into the gap between the window glass 21 and the sheet metal window frame 23. Assemble the mall.

<Problem to be solved by the invention> However, a molding (extruded product) extruded from the above molding material
Has the following problems.

(1) When assembling the molding, it is necessary to bend the molding body 1 and the holding fins 5 and 6, but the assembling workability is significantly different between summer and winter. The reason is that the rigidity (elastic modulus) of the molding material has high temperature dependency.

(2) For the same reason, a large difference is likely to occur in the main body / fin holding power of the mall between summer and winter.

(3) The elastic recovery was not good, that is, the deformation generated during the transport of the mall was poorly returned, and there was a possibility that the assembly workability was adversely affected.

An object of the present invention is to provide a vinyl chloride resin-based extruded material capable of solving the above problems.

<Means for Solving the Problems> The vinyl chloride resin composition for extrusion of the present invention solves the above problems by the following constitutions.

A material used for extruded vinyl chloride resin which has non-rigidity and substantial spring-like elasticity, and is a vinyl chloride resin-based extrusion formed by mixing a plasticizer, a stabilizer and other auxiliary materials with the vinyl chloride resin. In the material, the extruded material satisfies the following requirements.

(1) 20% of a crosslinked resin having an average degree of polymerization () = 1450 to 4000 and having a tetrahydrofuran (THF) insoluble content of 5 to 50%
100 parts of vinyl chloride resin contained above. (2) Plasticizer consisting of one or more of phthalic esters having 8 to 11 alkyl chain carbon atoms. 20 to 50 parts. (3) Amount of bound nitrile 30. ~ 40%, Mooney viscosity ML _{1 + 4} (1
00 ° C) Modifier consisting of 50 to 80 partially crosslinked nitrile rubber ...
10 to 50 parts.

<Detailed Description of Means> This is a material used for a non-hard, substantially spring-like vinyl chloride resin extruded product, in which a plasticizer, a stabilizer, and other auxiliary materials are compounded with the vinyl chloride resin. It is necessary that the following requirements be satisfied in the extruded vinyl chloride resin material.

(1) As the vinyl chloride resin, a resin containing 20% or more of a partially crosslinked resin having a content of 5 to 50% of a tetrahydrofuran (THF) -insoluble component and having an average degree of polymerization () = 1450 to 4000 is used.

Here, the partially crosslinked resin is obtained by copolymerizing vinyl chloride and a polyfunctional compound having two or more ethylenic double bonds in the molecule, and the degree of crosslinking is determined by a THF-insoluble component. .

By using this partially crosslinked resin, the elastic recovery of the molding is improved. The mixing ratio of the partially crosslinked resin is usually 20% or more.

On the other hand, if the value is smaller than the above value, it is difficult to obtain required physical properties in terms of the elastic modulus and the elastic recovery rate, and if the value exceeds the value, there is a problem in extrudability.

(2) As the plasticizer, use is made of one or more of phthalic acid esters having 8 to 11 carbon atoms in the alkyl chain, and the amount of the phthalic acid ester to be added to the vinyl chloride resin is 20%.
Up to 50 parts.

Here, as the phthalic acid esters, di (2-
Ethylhexyl) phthalate, diisodecyl phthalate, diundecyl phthalate, dinonyl phthalate, di (heptyl, nonyl, undecyl) phthalate (molecular weight
414), dinormal alkyl phthalate (molecular weight 391) and the like. When the number of carbon atoms in the alkyl chain is less than 8, it is difficult for the extrudate to have cold resistance, and when it exceeds 11, the compatibility with the vinyl chloride resin is poor. If the amount of the plasticizer is less than 20 parts, it is difficult to obtain the required elasticity in the extrudate, and
If the number exceeds the part, the shape retention is lost.

(3) As a modifier, 10 to 50 parts of partially cross-linked nitrile rubber having a bound nitrile content of 30 to 40% and a Mooney viscosity of ML _{1 + 4} (100 ° C) 50 to 80 is added to 100 parts of vinyl chloride resin. I do.

Here, the partially crosslinked nitrile rubber refers to a crosslinked nitrile rubber with divinylbenzene or the like. The degree of crosslinking is usually determined by the toluene insoluble content, and
Use the above. The reason for using the partially crosslinked nitrile rubber is from the viewpoint of improving elastic recovery and dispersibility in a vinyl chloride resin. Also, the amount of bound nitrile is 30
If the amount is less than 40%, the plasticizer tends to bleed, and if it exceeds 40%, the modifying effect tends to decrease. Further, if the nitrile rubber compounding amount does not reach the lower limit, the modifying effect is not sufficient,
Exceeding the upper limit results in poor extrudability.

Each material is blended and kneaded, and pelletized to form a molding material so as to satisfy the above-mentioned mixing requirements.

Here, examples of the stabilizer used include Ba-Zn type and the like.

Other auxiliary materials include inorganic fillers such as calcium carbonate, talc and clay, as well as pigments and processing aids.

<Operation and Effect of the Invention> The vinyl chloride resin-based extrusion molding material of the present invention is non-hard and has substantial spring-like elasticity, and a plasticizer, a stabilizer, and other auxiliary materials are added to the vinyl chloride resin. In the compounded vinyl chloride resin extrusion molding material, as the vinyl chloride resin, tetrohydrofuran (THF) with a high degree of polymerization
A resin containing 20% or more of a crosslinked resin having an insoluble content of 5 to 50% is used. As a plasticizer, phthalic acid esters having an alkyl chain carbon number of 8 to 11 are used. By using a partially cross-linked nitrile rubber having a Mooney viscosity of 40% and a Mooney viscosity of ML _{1 + 4} (100 ° C.) of 50 to 80, an extrudate formed using the material can be supported as described in Examples below. The following effects are obtained.

(1) Since the temperature dependency of the rigidity (spring-like elasticity) of the molding material is smaller than in the past, it is necessary to bend the molding body 1 and the fins when assembling the molding. As described above, there is no significant difference in workability between the summer and the winter.

(2) For the same reason, there is no great difference between the summer and winter seasons in the holding force of the main body portion and the fin portion of the mall as in the related art.

(3) The spring-like elastic recovery property is improved, and the elastic recovery property of the deformation generated during the transport of the mall is improved as compared with the conventional art, and from this point also, the assembling workability is improved.

<Example> Hereinafter, an example performed together with a comparative example to confirm the above effects will be described.

Materials of the compounding recipe shown in Table 1 are kneaded and pelletized to prepare a molding material.

Using the molding material of each example thus prepared,
Each extrudate was obtained.

 The following items were tested for each extrudate.

(1) Temperature dependence test of elastic modulus: Using a viscoelastic spectrometer (manufactured by Iwamoto Seisakusho, measurement frequency: 20 Hz), measurement was performed at -20 to 100 ° C at 2 ° C intervals. FIG. 2 shows the measurement results, and it can be seen that the examples of the present invention have lower temperature dependence of the elastic modulus than the comparative examples.

(2) Hysteresis loss measurement test: Using Tensilon, pulling / restoring speed 50 mm
/ Min. Each hysteresis loss is shown in Table 1. It can be seen that the hysteresis loss of each of the examples is smaller than that of the comparative example, and that the creep recovery is good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a mounting mode of a product (flash mount molding) to which the molding material of the present invention can be applied, and FIG. 2 is a graph showing a result of a temperature dependence test of an elastic modulus. 1. Mall body, 3. Legs, 5, 6, Holding fins, 21 ... Fixed window plate, 23 ... Sheet metal window frame, 25 ... Sealant, 30 ... Dam.

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-66732 (JP, A) JP-A-61-188440 (JP, A) JP-A-60-40145 (JP, A)

Claims (1)

(57) [Claims] Claims: 1. A material used for extruded vinyl chloride resin which is non-rigid and has substantial spring-like elasticity, comprising a plasticizer, a stabilizer and other auxiliary materials mixed with the vinyl chloride resin. In a vinyl resin-based extruded material, the extruded material satisfies the following requirements. (1) 20% of a crosslinked resin having an average degree of polymerization () = 1450 to 4000 and having a tetrahydrofuran (THF) insoluble content of 5 to 50%
100 parts by weight of vinyl chloride resin contained above; (2) plasticizer comprising one or more phthalic acid esters having 8 to 11 alkyl chain carbon atoms; 20 to 50 parts by weight; (3) binding nitrile Amount 30-40%, Mooney viscosity ML _{1 + 4} (1
00 ° C) Modifier consisting of 50 to 80 partially crosslinked nitrile rubber ...
10… 50 parts by weight,