CS219019B1 - Dipping compound for glove production - Google Patents

Abstract

The invention relates to a polyvinyl chloride-based mixture for the production of gloves, especially gloves with an inner textile lining, by dipping. So far, highly viscous polyvinyl chloride has been used as the basis of these pastes, optionally with a small amount of a low-viscosity polymer. Its solvation is so fast that it prevents unwanted penetration of the mixture through the textile. Achieving sufficiently fast solvation in low-viscosity polymers is possible by using larger amounts of rapidly solvating plasticizers, which, however, will be reflected in their increased migration in the product. These shortcomings are not exhibited by low-viscosity polyvinyl chloride-based dipping mixtures, the essence of which is that they contain, per 100 parts by weight of polymer, 100-130 parts by weight of plasticizers and 1-20, preferably 3-10 parts by weight of an effective solvating agent, which is a glycol ether of the general formula HO—(CH2)X—OR, where x is an integer from 2 to 6 and R is an alkyl group with 1-4 carbon atoms. Examples of usable solvating agents are ethylene glycol monoethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether.

Description

The present invention relates to a composition of a composition for the manufacture of polyvinyl chloride gloves by dipping.

Polyvinylchloride gloves made by dipping find their application mainly as working gloves for wet and chemical plants, where their excellent resistance to acid solutions and some types of organic solvents proves to be good. Because of long-term use, it is necessary for hygienic reasons to produce these gloves with a cotton-based textile backing. The glove technology is then adapted to the design of the gloves.

Warm dipping technology is known and used for the production of gloves, which consists in that a metal or other (porcelain, wood) mold with a textile lining is heated to 150-180 ° C and then immediately immersed in the prepared polyvinyl chloride mixture and slowly extends so that the excess paste flows down and drips). By immersing the heated mold with the textile lining, accelerated solvation of the paste occurs in the immediate vicinity of the mold, so that the paste does not penetrate through the lining and stick to the mold. After the excess paste has been dripped, the facing mold on the textile lining is exposed to gelatinizing temperatures of 180-200 degrees Celsius, then cooled and the gloves are separated from the mold.

The technology used is very sensitive to the composition of plastisol, but especially to the type of polymer used. At present, a highly viscous polymer with high sensitivity to solvation due to elevated temperature, or a combination thereof with a minimum amount of low viscosity, is used.

Practice has shown that for the purpose of soaking, low viscosity polymers can be considered to have viscosities below 10,000 mPa.s under the given conditions, while other polymers are considered high viscosity. This polymer yields high viscous pastes which exhibit low viscosity stability when high softened.

However, the plastisol prepared from this polymer complies with immersion technology without reservation. Solvation of the paste during immersion of the preheated mold and immediately thereafter is so rapid that there will be no penetration of the textile lining and there is no need to add fast-solvating plasticizers such as dibutyl phthalate or butylbenzyl phthalate. Other low viscosity emulsion or microsuspension polymers in combination with pure dioctyl phthalate give a suitable dipping viscosity, but the solvation of the paste after dipping the mold with the textile lining is slow, so that the paste penetrates through the lining and adheres to the mold.

By suitable composition of the plasticizer mixture, i.e. by using about 50% fast-solvating dibutyl phthalate in combination with dioctyl phthalate, the paste solvation rate can be adjusted so as not to penetrate the paste through the lining, but on the other hand high viscosity increases during paste storage. use in operating conditions. In addition, the use of an increased amount of more volatile dibutyl phthalate results in increased end product migration associated with solidification of the product.

It is therefore an object of the present invention to find a suitable composition of the polyvinyl chloride soak mixture using conventional low viscosity polymers so as to overcome the above disadvantages.

It has been found that this requirement fulfills a composition comprising, per 100 parts by weight of polyvinyl chloride having a viscosity of 500-1500 mPa · s and a value of 65-75, 100-130 parts by weight of a phthalate plasticizer, and 1-20, preferably 3-10 parts by weight of a solvating agent which is a glycol ether of the formula HO- (CH ₂ ) _x -OR, wherein x is an integer from 2 to 6 and R is an alkyl group of 1-4 carbon atoms.

The suitability of the laboratory-prepared polyvinyl chloride mixtures for dipping was verified by comparing the measurements of the viscosity time increase at 60 ° C and the shear rate of 24.3 s ^-1 . A high-viscosity polymer blend in combination with a low-viscosity polymer, which has been proven in a long-lasting rope, was used as a comparative standard. Viscosity measurements were taken at 1 minute intervals for 15 minutes.

Given the above-described warm soaking characteristics, it is critical to achieve the highest possible viscosity in the first minute of the measurement and then a further steep increase. When measuring the viscosity of the standard mixture, a viscosity value of 1100 mPa.s was obtained in the first minute and a further time increase, expressed by the slope of the line k = 0.7,

The initial viscosity value in the first minute and the slope of the viscosity increase line form the basic variables that determine the suitability of the mixture for warm soaking technology. When the same or higher values of both values are reached, it is highly probable that the mixture is suitable for soaking technology, ie the fact that the paste will not penetrate the textile lining.

By this method, it has been found that volatile organic compounds based on glycol ether, for example ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether, when mixed with primary plasticizers, dioctyl phthalate and dibutyl phthalate, have a synergistic effect in accelerating the solvation of polyvinyl chloride. The use of some of these glycol ethers, but preferably ethylene glycol monoethyl ether in pastes, makes it possible to prepare a suitable blend for low viscosity polyvinyl chloride polymers based technology with a minimum amount of dibutyl phthalate as a quick solvating softener.

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otherwise, it has an adverse effect on the viscosity stability in large quantities and is manifested in the final product by increased migration. Part of the low-viscosity polymer can also be replaced by a filler suspension polymer when the glycol ether materials are used.

To illustrate the invention, we present several examples of composition of the composition using low viscosity polyvinyl chloride and one of the glycol ethers and comparing it to a standard high viscosity polymer formulation. The viscosity reported as a characteristic of the individual polymers is always given as the viscosity of plastisol prepared from 100 parts by weight of polyvinyl chloride and 100 parts by weight of dioctyl phthalate measured immediately after mixing at 25 ° C and a shear rate of 24.3 s ^-1 .

Example 1

Ingredients of standard comparative recipe polyvinyl chloride high viscosity, K value 72, viscosity 35 300 mPa.s polyvinyl chloride low viscosity, K value

68, viscosity 680 mPa.s dioctyl phthalate epoxybutyl ester of fatty acids complex barnatocadium stabilizer titanium white viscosity 60/1 in mPa.s k

Example 2 polyvinyl chloride low viscosity, K value

70, viscosity 1313 mPa.s dioctyl phthalate dibutyl phthalate epoxybutyrate of fatty acids complex barnatocadium stabilizer titanium white ethylene glycol monoethyl ether viscosity 60/1 mPa.s k

The mixtures shown in the individual examples were prepared in the same manner by mixing all the components in a rapid mixer at 500 rpm. One hour after mixing the mixture, the viscosity of the mixture was measured at 60 ° C at a shear rate of 24.3 sec ¹ and the viscosity increase at minute intervals for 15 minutes as described above. The critical viscosity value in the first minute of measurement is hereinafter referred to as 60/1 viscosity and viscosity increase as the slope of the line to (values in column 2 in Examples 2-9). The viscosity values of the same mixtures without the glycol ether solvating agent (values in column 1 in Examples 2-9) are also shown for comparison. The amounts of the components are by weight.

100 ALIGN!

1100

0.7

100 <500 <0.3

100 ALIGN!

1450

1.0

Example 3 low viscosity polyvinyl chloride, K value

70, viscosity 1313 mPa.s dioctyl phthalate dibutyl phthalate epoxybutyrate of fatty acids complex barnatocadium stabilizer titanium white ethylene glycol monoethyl ether viscosity 60/1 in mPa.s k

100 ALIGN!

550

0.54

100 ALIGN!

1340

1.4

Example 4 low viscosity polyvinyl chloride, K value

70, viscosity 1313 mPa.s 100 dioctyl phthalate 80 dibutyl phthalate 30 epoxybutyrate of fatty acids 16 complex barnatocadium stabilizer 1 titanium white 1 ethylene glycol monoethyl ether - viscosity 60/1 in mPa.s 500 to 0,32

Example 5 low viscosity polyvinyl chloride, K value

70, viscosity 1313 mPa.s 100 dioctyliftalate 75 dibutyl phthalate 25 epoxybutyrate of fatty acids 16 complex barnatocadium stabilizer 1 titanium white 1 ethylene glycol monoethyl ether - viscosity 60/1 in mPa.s 700 to 0,44

Example 6 polyvinyl chloride low viscosity, K value

70, viscosity 1313 mPa.s 80 polyvinyl chloride suspension K value 65 20 dioctyl phthalate 70 dibutyl phthalate 30 epoxybutyrate of fatty acids 16 complex barnatocadium stabilizer 1 titanium white 1 ethylene glycol monoethyl ether - viscosity 60/1 in mPa.s <500 k <0,3

EXAMPLE 7 polyvinyl chloride low viscosity, K value

66, viscosity 1266 mPa.s 100 dioctyl phthalate 75 dibutyl phthalate 25 epoxybutyrate of fatty acids 16 complex barnatocadium stabilizer 1 titanium white 1 ethylene glycol monoethyl ether - viscosity 60/1 in mPa.s 750 to 0,45

100 ALIGN!

1450

1.0

100 ALIGN!

1500

2.00

1200

0.89

100 ALIGN!

2100

0.81

Example 8 polyvinyl chloride low viscosity, K value

71, viscosity 891 mPa.s 100 dioctyl phthalate 75 dibutyl phthalate 25 epoxybutyrate of fatty acids 16 complex barnatocadium stabilizer 1 titanium white 1 ethylene glycol monoethyl ether - viscosity 60/1 in mPa.s 800 to 0,48

100 ALIGN!

4150

0.67

Example 9 polyvinyl chloride of low viscosity, K value

71, viscosity 891 mPa.s diocityl phthalate dibutyl phthalate epoxybutyrate of fatty acids complex barnatocadium stabilizer titanium white ethylene glycol monobutyl ether viscosity 60/1 in mPa.s k

100 ALIGN! 100 ALIGN! 80 80 20 May 20 May 16 16 1 1 1 1 - 10 500 1500

<0.3 1.3

Claims (2)

1. A dip-coating composition comprising polyvinyl chloride, plasticizers, stabilizers, pigments and, optionally, other additives, characterized in that it contains, per 100 parts by weight, polyvinyl chloride having a viscosity of 500-1500 mPa.s and a value of 65-75, 100-130 parts by weight. plasticizers phthalate type and also 1-20, preferably 3-10 parts by weight of solvating činidvynalezu la, which is a glycol ether of the formula HO- (CH _{2) x} -OR, where x is an integer from 2 to 6 and R is -alkyl groups with 1-4 carbon atoms. 2. The composition of claim 1 wherein the solvating agent is a compound selected from the group consisting of ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, and ethylene glycol monobutyl ether.