JPS62177253A - Polyester filament canvas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a polyester filament canvas used as a base fabric for tents, flexible containers, vehicle bellows, marine seats, construction sheets, and the like.

(Prior art) Filament canvases used as base fabrics for tents, flexible containers, vehicle bellows, etc. are required to have mechanical dimensional stability, and vinylon fibers and nylon fibers have traditionally been used, but in recent years, Polyester fibers have come to be used because they have the characteristics of high model elasticity and low elongation, excellent dimensional stability, and low cost.

(Problems to be Solved by the Invention) However, tents made of filament canvas using high-mode elastic, low-elongation polyester fibers;
Flexible containers and vehicular Harona containers have a problem in that they have poor durability and cannot be used for long periods of time.

An object of the present invention is to solve the problems of the conventional polyester filament canvas and to provide a polyester filament canvas that has excellent dimensional stability and good durability.

(Means for Solving the Problems) The present invention is made of a polyester having an intrinsic viscosity of 0.9 or more and having ethylene terephthalate as a main unit, an initial modulus of 90 g/de or more, and a breaking elongation of 12 to 2.
0%, and a polyester filament canvas having a hysteresis loss of 0.04 inch-pound or less at 150°C.

The polymer constituting the polyester filament used in the present invention is a polyester containing 90 mol% or more, preferably 95 mol% or more of ethylene terephthalate repeating units in the molecular chain. Polyethylene terephthalate is suitable as the polyester to be bent, but 10 mol%
It is permissible to contain other copolymerizable components in a proportion of less than 5 mol %, preferably less than 5 mol %. Examples of such copolymerization components include isophthalic acid, naphthalene dicarboxylic acid, acihinic acid, oxybenzoic acid, diethylene glycol, propylene glycol, trimellitic acid, and pentaerythritol. These polyesters may also contain additives such as stabilizers and colorants.

The polyester filament used in the present invention is 25
℃0 - The intrinsic viscosity determined from the chlorophenol solution is 0.
It must be 90 or higher. Intrinsic viscosity is 0.90
If it is less than that, the strength of the filament campus will be insufficient and it will be inappropriate. The limiting viscosity is preferably 0.9 to 1.3.

In addition, the polyester filament used in the present invention has an initial modulus of 90 g/de or more and an elongation of 12 to 2.
It needs to be 0%. Outside this range, the mechanical dimensional stability of the filament campus will be poor.

Further, the polyester filament used in the present invention must have a hysteresis loss of 0.04 inch-pound or less at 150°C. If the hysteresis loss exceeds 0.04 inch-pounds, the filament campus becomes less durable and cannot be used for a long period of time. Here, hysteresis loss refers to the loss value obtained by drawing a hysteresis loop of a sample filament using an Instron tensile tester.
It is measured by the method described in page, lower left column, line 1 to page 10, lower left column, line 11.

The polyester filament used in the present invention can be obtained, for example, by the following method.

Polyester containing ethylene terephthalate as the main repeating unit and having an intrinsic viscosity of 0.95 to 1.5 or an intrinsic viscosity of 0
．． 7 to 0.9 polyester is reacted with a polymerization degree accelerator, melted and transported by a conventional method, spun from a spinneret into a cooling zone, and immediately quenched and solidified at a take-up speed of 800 to 5,000.
m/min, preferably from 1000 to 3500 m/min, with a birefringence of 900 x 10' to 700
0 x 10-', preferably Ha1200 x 10-'
It is produced by drawing an undrawn yarn of 10-6000 x 10-' to 80% or more, preferably 82% or more of its cutting elongation. This stretching may be carried out continuously following spinning, or it may be carried out once after spinning, and then stretched.
It may be stretched in one step by 80% or more of the cutting elongation, or it may be stretched in multiple stages of two or more stages. In this stretching, the heating means (in the first stage of stretching when performing multi-stage stretching) is a steam jet method in which superheated steam of 250 to 650°C, preferably 280 to 600°C is ejected,
A heating roller system at 120° C. can be adopted. Further, after stretching, heat treatment can be performed if necessary.

The polyester filament thus obtained is
Depending on its use, it is woven at a predetermined weaving density to form a filament canvas. For example, when using 1000 denier polyester filament, the warp density is 43 to 51 filaments/inch for a vehicle gasket, the warp density is 37 to 46 filaments/inch for a flexible container, and the warp density is 14 to 46 filaments/inch for a flexible container.
20 lines/inch, latitudinal density 15-22 lines/inch, for tents, longitudinal density 43-58 lines/inch, latitudinal density 37-5
It is common to use 4 lines/inch.

Next, the obtained filament campus is processed with a resin such as vinyl chloride resin to produce products such as tents, flexible containers, vehicle bellows, marine seats, and construction sheets.

(Example) Hereinafter, the present invention will be further explained with reference to Examples. In addition, all parts in the examples indicate parts by weight, and the dimensional stability of the filament campus and the durability of the product were measured by the following method.

(1) Dimensional stability A load of 2 g/de was applied to a 10 cm test piece in the warp and weft directions, and the dimensional changes in the warp and weft directions after being left for 24 hours were measured and indicated by the following symbols.

Dimensional change less than 3%: ◎ Dimensional change 3-5%: ○ Dimensional change more than 5%: × (2) A 10cm durability test piece was bent in the warp direction at an angle of 90” at a temperature of 5.
After flexural fatigue at 0° C. for 1000 minutes, the strength in the warp direction was measured, and the strength retention rate was calculated and expressed with the following code.

Strength retention rate of more than 80 parts: ◎ Strength retention rate of 60 to 80%: ○ Strength retention rate of less than 60%: × Examples 1 to 5, Comparative Examples 1 to 5 97 parts of dimethyl terephthalate, 6 parts of ethylene glycol
9 parts of calcium acetate monohydrate, 0.034 parts of calcium acetate monohydrate, and 0.025 parts of antimony trioxide were placed in an autoclave, and methanol produced as a result of transesterification was removed at 180 to 230°C while slowly passing nitrogen, and then H3P0
．． Add 0.05 part of a 50% aqueous solution of
The pressure was gradually reduced to 0.degree. C., and the polymerization reaction was continued for about 1 hour and 50 minutes to obtain a polymer having an intrinsic viscosity of 0.80 and a terminal carboxyl group weight of 28 equivalents ffi/106 grams polymer.

100 parts of this polymer chip was triblended with 2,2'-bis(2-oxazoline) (GE) in the amount shown in the following table, and then melted and transported at approximately 300°C.
Immediately after the yarn is discharged from the spinneret having 0 yarns, 2
Cool and solidify while blowing 5°C cooling air at 20 Nrd/'w, then apply oil with an oiling roller, guide it to a take-up roller, and immediately place 2.2 kg/c JIG between it and the stretching roller without rolling it up. A steam jet was sprayed onto the yarn at an angle of 45° and the yarn was drawn to obtain various drawn yarns. At this time, the speed of the take-up roller, the temperature of the steam jet, the stretching ratio, and the temperature of the stretching roller were variously changed as shown in the following table.

The stretching ratio is determined by injecting a steam jet interposed between the take-up roller and the stretching roller to guide the yarn to the stretching roller, and gradually increasing the speed of the stretching roller to determine the maximum stretching ratio when cutting. Shown as a percentage (%).

Furthermore, the temperature RT of the stretching roller is equal to the temperature in the air without actively heating the roller.

The intrinsic viscosity and birefringence of the undrawn yarn, which was taken off with a take-off roller at room temperature and wound up without being stretched, were measured, and are shown in the table below along with the physical properties of each drawn yarn.

Using each of the obtained drawn yarns, a plain weave fabric with a warp density of 46 fibers/inch and a weft density of 38 fibers/inch was woven into a filament canvas for use as a frame for vehicles.
The dimensional stability and durability were measured and shown in the table below.

(This page, blank space below) As is clear from the table, when a polyester filament with an intrinsic viscosity of less than 0.9 is used (Comparative Example 1), the tear strength of the filament canvas decreases, and the elongation of the filament decreases. is less than 12% (Comparative Example 2) and more than 20% (Comparative Example 3), and the initial modulus is 90%.
In the case where g/de was not grooved (Comparative Example 4), the dimensional stability of the filament campus was poor. Further, when the hysteresis loss of the filament exceeded 0.04 inch-pound (Comparative Example 5), the durability of the filament canvas deteriorated.

In contrast, when a polyester filament with an intrinsic viscosity of 0.9 or more, an initial modulus of 90 g/de or more, an elongation of 12 to 20%, and a hysteresis loss of 0.04 inch-pound or less (Example 1) -5) A filament canvas having sufficient tear strength and dimensional stability and excellent durability can be obtained.

(Effects of the Invention) According to the present invention, a polyester filament canvas having good strength and dimensional stability and excellent durability is provided.

Claims (1)

[Claims] Consisting of polyester with an intrinsic viscosity of 0.9 or more with ethylene terephthalate as the main repeating unit, initial modulus of 90 g/de or more, breaking elongation of 12 to 20%, 15
A polyester filament canvas comprising polyester filaments having a hysteresis loss of 0.04 inch-pound or less at 0°C.