KR19990061565A - PVC composition with excellent vacuum molding and its manufacturing method - Google Patents

Abstract

The present invention relates to a PVC (POLYVINYLCHLORIDE) sheet composition, and more particularly, to a vacuum sheet PVC sheet composition excellent in vacuum molding, excellent in matting, embossed pattern retention and physical properties compared to the prior art.

Conventional PVC sheet is a plasticizer or MBS (methyl methacrylate butadiene styrene copolymer), CPVC (chrominated polyvinyl chloride), alpha-methyl styrene ABS (acrylonitrile) to improve the vacuum formability. Butadiene-styrene), a method of blending acrylic polymers is known, but this conventional technique did not significantly improve the vacuum forming of the PVC sheet, but only caused a decrease in mechanical properties and a price increase of the PVC sheet.

Therefore, the present invention is a PVC sheet manufacturing method and composition excellent in vacuum forming using a general impact-resistant ABS resin in order to greatly increase the vacuum forming and improve the physical properties, without a large increase in price, unlike the conventional vacuum forming PVC sheet It is about.

The PVC composition of the present invention is mixed with PVC resin having a polymerization degree of 700-1000 and ABS resin having 15-25% of acrylonitrile, 50-60% of styrene, and 25-35% of butadiene at a ratio of 7: 3 to 3: 7. 100 parts by weight of a mixture consists of 5-20% by weight of a lubricant coated calcium carbonate filler, 0.2-3.0% by weight polybutyltin maleate, 0.2-3.0 parts by weight butyltin mercaptide heat stabilizer, and other fatty acid ester lubricants.

The composition according to the present invention is a PVC composition not only excellent in vacuum forming, but also excellent in mattness, embossed pattern retention and physical properties.

Description

PVC composition excellent in vacuum forming and its manufacturing method.

In general, PVC sheet is cheaper than other materials, and has excellent chemical resistance, weather resistance, and flame retardancy, and good mechanical properties, so that it can be applied in various fields during vacuum forming. It can be widely used for building materials such as cover, lamp shade, etc., and products that give a matte or embossed pattern in terms of appearance tend to be preferred.

In general, rigid PVC film manufactured by the calendar method is applicable to food packaging materials and sundries packaging materials by vacuum molding, while PVC sheets having a thickness of 1 mm or more are difficult to manufacture and have insufficient vacuum forming, and thus, it is difficult to apply products to construction materials. .

Therefore, in order to improve the vacuum forming of the PVC sheet, conventionally, a plasticizer or MBS (methyl methacrylate butadiene styrene copolymer), CPVC (chrominated polyvinyl chloride), alpha-methyl styrene ABS (heat-resistant ABS) Acrylonitrile-butadiene-styrene) and a method for blending an acrylic polymer are known from Japanese Patent Application Laid-Open No. 48-80144, Japanese Patent Application No. 49-9556, and the like.

However, this prior art not only did not significantly improve vacuum formability, but also resulted in an increase in price.

The composition of the present invention is mixed with a relatively low-cost general-purpose shock-resistant ABS resin in an appropriate ratio in addition to the alpha-methyl styrene ABS resin, a conventional heat-resistant ABS that is expensive to the PVC resin, by adding a calcium carbonate-based filler and a tin-based heat stabilizer It is an object of the present invention to provide a PVC sheet for shortening the vacuum forming time, excellent vacuum forming state, and preserving the embossed pattern after vacuum forming as compared to the PVC sheet.

It is another object of the present invention to provide a PVC sheet which maintains the matteness of a product and suppresses deterioration of the product during molding at high temperature by adding a large amount of filler and tin-based heat stabilizer.

In order to achieve the above object, the composition of the present invention is a PVC resin having a polymerization degree of 700-1000, general-purpose impact resistant ABS resin, calcium carbonate filler, polybutyltin maleate thermal stabilizer, butyltin mercaptide thermal stabilizer and other fatty acid ester lubricants and pigments. Consists of

Hereinafter, the preparation method of the composition according to the present invention will be described in more detail.

1. 5-20 parts by weight of a lubricant coated calcium carbonate filler and polybutyltin based on 100 parts by weight of a mixture of a PVC resin having a polymerization degree of 700-1000 and a general impact-resistant ABS resin at a ratio of 7: 3 to 3: 7. 0.2-3.0 parts by weight of heat stabilizer 0.2-3.0 parts by weight of butyltin mercaptide and other fatty acid ester lubricants and pigments.

The lower the degree of polymerization, the lower the degree of polymerization, the more favorable the vacuum formability, while the lower the physical properties, and the higher the degree of polymerization is advantageous in terms of physical properties, but in terms of vacuum molding, it is disadvantageous in terms of vacuum forming and physical properties. It is most suitable that it is suitable and especially has a degree of polymerization of 800.

In order to improve the vacuum formability, the general impact resistant ABS resin is preferably composed of 15-25% of acrylonitrile, 50-60% of styrene, and 25-35% of butadiene. In particular, acrylonitrile 18- It is more preferable to consist of 20%, styrene 52-55%, and butadiene 25-28%.

The mixing ratio of PVC resin and ABS resin is 3: 7 to 7: 3, but the ratio of 6: 4 is most suitable in terms of formability and raw material cost reduction, and extrusion of the composition sheet by mixing ABS resin with high molding temperature Since the manufacturing temperature rises 20 ° C. or more above the conventional PVC sheet extrusion manufacturing temperature, the embossing process proceeds at a high temperature, thereby maintaining the original embossed pattern even after molding. The tensile strength and the heat resistance physical properties can be easily changed by the mixing ratio of ABS.

The lubricant coated calcium carbonate is added to maintain the matteness of the product when it is molded at a high temperature. When the content is increased, the smoothness of the product surface is reduced, but the gloss is reduced, but the tensile strength and impact strength are also lowered. 10 PHR is most suitable.

The heat stabilizer can prevent discoloration and deterioration of physical properties during heating during vacuum forming, and the tin-based stabilizer, which is less toxic to human contact, has the effect of lowering the heat stability and toxicity. .

2. The mixture of Paragraph 1 is stirred at high speed in a Henschel mixer so that the compound is heated to 130 ° C., and then transferred to a cooling mixer to a cabinet at room temperature to prepare a compound.

3. The above blend is kneaded for 10 minutes on a mixing roll at 170 ° C. and pressurized with a 180 ° C. press to prepare a sheet.

4. Alternatively, the compound of item 2 is extruded at a temperature of 170-200 ° C. in a T-Die front blower with an embossed roll.

The composition (example) of the present invention and a PVC resin (comparative example) prepared by a conventional technique were compared to measure vacuum forming property, glossiness, embossed pattern retention, and other physical property tests.

Table 1 shows the compositions of Comparative Examples and Examples.

Table 1 (Comparative Example and Example of the Invention)

Table 2 shows the results of comparing the physical properties of Comparative Examples and Examples.

The experimental method of each physical property is as follows.

1. Vacuum Forming Evaluation

The composition of Table 1 was made into a flat plate having a thickness of 2 mm (thickness) x 22 cm (width) x 22 cm (length) using a press, and then a small vacuum having a rectangular shape of 75 mm (width) x 65 mm (length) x 50 mm (height). Evaluate vacuum forming in the molding machine.

The sheet was heated until the heater temperature of the vacuum molding machine reached 190 ° C., and the surface temperature was confirmed by a laser thermometer.

The vacuum molded products were scored by observing the molding state, namely, the vacuum forming state of the corner portion and the sheet torn or burst while being stretched during vacuum forming. For example, 10 points are fully molded, 0 points are unformed, 10 points are no burst, and 0 points are severely burst.

2. Gloss Rating

The glossiness of the vacuum molded sheet is measured using GLOSSMETER.

3. Measurement of embossing pattern retention.

The compound prepared by Henschel Mixer was extruded into a sheet at a temperature of 170 ° C. to 200 ° C. in a T-die extruder equipped with an emboss roll, and then the embossed pattern disappeared and retained for the sheet and the molded article vacuum-molded. Observe.

4. Measurement of general physical properties

Measure and measure physical properties specimens in accordance with ASTM standards.

Tensile Strength Measurement: ASTM D638 Impact Strength Measurement: ASTM D 256

Vicat Softening Point: ASTM D 1525

Table 2

As can be seen from Table 2, in the case where the general impact resistant ABS resin of the present invention was added to the resin added to increase the vacuum forming property, the vacuum forming property was higher than that of the heat resistant ABS resin. It can be seen that the vacuum molding is high when the resin is blended.

In addition, when the lubricant-coated calcium carbonate filler was used, the matteness was greatly increased, and it was found that discoloration and physical property deterioration could be prevented by using a tin-based thermal stabilizer having excellent thermal stability.

Thus, plasticizer, MBS, CPVC, and heat-resistant ABS resin were used to improve vacuum formability in the conventional PVC resin, but in the present invention, general impact-resistant ABS resins are mixed at an appropriate ratio, and calcium carbonate-based fillers and tin-based heat By using a stabilizer, the vacuum molding time is shortened, the vacuum molding state is excellent, the matteness, the tensile strength, the heat resistance temperature is improved compared to the PVC sheet according to the prior art, and the embossed pattern is maintained even after vacuum molding. .

Claims (8)

In the PVC sheet composition, 5-20 parts by weight of a calcium carbonate filler with a lubricant coated with 100 parts by weight of a mixture of a PVC resin having a polymerization degree of 700 to 1000 and a general impact resistant ABS resin at a ratio of 7: 3 to 3: 7. A PVC sheet composition having excellent vacuum formability, comprising 0.2-3.0 parts by weight of butyltin maleate thermal stabilizer and 0.2-3.0 parts by weight of butyl tin mercaptide thermal stabilizer and other fatty acid ester lubricants and pigments. The ABS resin according to claim 1, wherein the ABS resin is acrylonitrile 15-25%, styrene 50-60%, butadiene 25-35%, in particular acrylonitrile 18-20%, styrene 52-55%, butadiene PVC sheet composition excellent in vacuum formability, characterized by being 25-28%. The PVC sheet composition having excellent vacuum formability according to claim 1 or 2, wherein the mixing ratio of the PVC resin and the ABS resin is 6: 4. The PVC composition with excellent vacuum formation according to claim 1 or 2, wherein the PVC resin has a degree of polymerization. 5-20 parts by weight of a lubricant coated calcium carbonate filler, polybutyltin maleate, in 100 parts by weight of a mixture of a PVC resin having a polymerization degree of 700 to 1000 and a general impact resistant ABS resin at a ratio of 7: 3 to 3: 7. 0.1-3.0 parts by weight of stabilizer and 0.2-3.0 parts by weight of butyltin mercaptide and other fatty acid ester lubricants and pigments were added to a Henschel mixer, followed by high-speed stirring to disperse the mixture sufficiently. After the transfer to a cooling mixer to cool to room temperature, a vacuum composition of the excellent PVC composition consisting of. The ABS resin according to claim 5, wherein the ABS resin is acrylonitrile 15-25%, styrene 50-60%, butadiene 25-35%, in particular acrylonitrile 18-20%, styrene 52-55%, butadiene 25-28% of the method for producing a PVC sheet composition excellent in vacuum formability. The method for producing a PVC sheet composition having excellent vacuum formability according to claim 5 to 6, wherein the mixing ratio of the PVC resin and the ABS resin is 6: 4. The method of producing a PVC composition with excellent vacuum forming according to claim 5, wherein the PVC resin has a degree of polymerization.