SU732784A1 - Photopolymerizable composition - Google Patents

Description

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The invention relates to photopolymerizable compositions that can be used in the printing industry for the manufacture of photopolymer printed forms, as well as in the radio, electronic and paint industry for the manufacture of printed circuit boards, varnishes.

A photopolymerizable composition is known, including hydrolyzed polyvinyl acetate monomethacrylate, ethylene glycol monomethacrylate, benzoin methyl ester, hydroquinone and water 1,

A disadvantage of the known photopolymerizable composition is its brittleness after the manufacture of the plate; in addition, the plates of this composition require conditioning for hours. before use.

The purpose of the invention is to create a photopolymerizable composition allowing to produce photopolymerizable Lustins with increased flexibility.

The goal is achieved by the fact that a modified photo is additionally introduced into the composition of a known photo-polymerising composition.

urea-form for maldehyde resin of the general formula:

H-N-1CH-SI J.- PM-CH, „- M-CH, -OI,

s-0 s-was-0 C - 0

 (one)

MNNNHNWjNH

whereR

R — C — C.C (CH, V — CH2, —C — CH — CH — CH —C — CH CH — C H5

Ltd

in the following ratio of components, weight.h. :

Hydrolyzed polyvinyl acetate 20-50 ethylene glycol monomethacrylate 1-30 methyl benzoin ester1-5 Modified urea moldsdehyde resin 5-20 Hydroquinone 0.01-0.05 Water 50-80 Example 1. 6 g of urea formaldehyde resin are loaded into the three-neck reactor with mixing and M 19-62, GOST 14231-69), dissolved in 60 ml of distilled water, 0.6 g of methacryl chloride and 0.26 g of sodium hydroxide in the form of a 10% aqueous solution are carefully added dropwise. After 1 h the cooling is removed

and stir the reaction mixture for 2 hours at room temperature. After completing the synthesis, the reaction mixture is filtered, an aqueous solution of ammonia is completed before the neutral reaction of the medium and 0.1 g of hydroquinone. The synthesized oligomer is separated from the reaction medium by distilling water at 40-45 ° C and a vacuum of 20 mm Hg. The resulting product is colorless and viscous. The residual water content, as determined on the PVM-2 device according to the Fisher method, is 7.2%. The oligomer is soluble in water, aqueous alkaline solutions, methanol, ethanol, dimethylformamide. The molecular weight determined by the method of cryoscopy in water 400-500, Characteristic bands of absorption in the area of 1640 cm indicate the presence of C to C double bonds. This is also confirmed by the polarographic method. The potential of the half-wave of the reduction of the double bond in 80% ethanol against the background of 0.1 M LiCI 1.77 V. The resulting product is used in a photopolymerizable composition, which is prepared as follows, 4 g of hydrolyzed polyvinyl acetate (degree of saponification, 84-88 mol, %, degree of polymerization 300-500) is triturated in 10 ml of distilled water at room temperature to a homogeneous mass, which is heated in an oven to 85 EO C for 2 h. To a clear solution of hydrolyzed polyvinyl acetate is added 2.66 g of ethylene glycol monomethylether, 1.33 g moles, obtained according to the proposed method, as photoinitiator using 1 part by weight methyl ester benzoin per stitching agent. To inhibit the process of thermopolymerization and to obtain a clear profile of elements, 0.01-0.05 weight, h is used. hydroquinone in the calculation of cross-linking agents. After all the components have been introduced, the photopolymerizable composition is thoroughly mixed and deaerated at 40 ° C. After filtering, the composition is poured onto an activated aluminum substrate and air dried for 24 hours. The finished plates are exposed to full light of a LUE-BO lamp at a distance of 6 cm through a plastic film. The exposure time of the plate is 2-3 m. The resolution is 125 min / cm, the angle at the base of the printing elements is 60 °. The flexibility of the exposed film is determined on an SHG-1 device and is 5 mm. For comparison, the flexibility of the film is determined without the addition of urea formaldehyde resin. The bend on the SHG-1 in this beam is 20 mm, t, e. 4 times less; than for a film containing a plasticizer.

Example 2, Into the reactor with stirring and + 2-3 ° C load 9 g

urea-formaldehyde resin dissolved in 90 ml of distilled water, 1.8 g of methacrylic acid chloride (ratio of resin: acid chloride), parts by weight: L: 1 and 0.78 g of hydrochloric acid in 10% strength are added gradually. aqueous solution. After loading potassium hydroxide, the temperature of the reaction mixture was set to 1.0 C, After 1 h, the cooling was removed and the synthesis was continued at room temperature for 3 hours. The oligomer was isolated from the reaction mixture as in Example 1, Synthesized oligomer-transparent viscous liquid, water, 24.3%, half-wave potal recovery, 1.78, characteristic band at 1645 ° and 1200 cm indicates the presence of a C-O-C (O) -group, molecular weight (cryoscopy in water) 430-460. 0 To prepare a photopolymerizable composition, 1.33 g of the obtained product is used as a plasticizer and crosslinking agent. This way receive forms. Flexibility 5 films after exposure to 5 mm along the SHG-1.

Example Z. In the reactor with stirring and 3.5 ° C load 6.0 g of urea-formaldehyde resin.

dissolved in 60 ml of distilled water, 0.6 g of crotonic acid chloride and 0.36 g of potassium hydroxide are gradually added as a 10% aqueous solution. After upload

. potassium hydroxide, the temperature of the reaction mixture rises by 2 ° C. After 1 h, stop cooling the reaction mixture and continue the synthesis at room temperature and stirring for 2.5 h. Isolation

0 oligomers as in example 1. Synthesized oligomer viscous liquid. Water content is 29.5%. The half-wave potential in 80% ethanol against a background of 0.1 M of lithium chloride is 1.80 V. Diffuse Diots characteristic absorption bands in the 1640 and 1200 cm region The molecular weight determined by the cryoscopic method in water 460-480. To prepare the photopolymerizable composition, 1.33 g of the obtained product is used. Forms are obtained as in example 1, the Flexibility of the exposed films of 10 mm SHG-1,

Example 4. In the reactor at

. ne) mixing and 5 loading

6.0 g of urea-formaldehyde resin dissolved in 60 ml of distilled water, 1.8 g of crotonic acid chloride. Then 1.08 g of potassium hydroxide is added in the form of

0 10% aqueous solution. After loading the catalyst, the temperature of the reaction mixture was increased by 3.5 ° C. Stir for 1 hour in an ice bath and 4 hours at room temperature. Isolation of the oligomer is analogous to Example 1. The synthesized oligomer is a viscous liquid containing 36.8% water. The oligomer is used to obtain forms as in Example I. The flexibility of the films after irradiation of 10 mm according to SHG-1. Example 5. 6.0 g of urea-formahyde resin dissolved in 60 ml of distilled water, 0.6 g of cinnamic acid chloride dissolved in 20 ml of acetone are loaded into the reactor, then 0.22 g of potassium hydroxide in the form of 10% is added from a dropping Voronin. aqueous solution. After catalyst loading, the temperature of the reaction mixture rises by 0, 5 ° C. After 1 hour, the cooling is removed and the synthesis is continued with stirring at room temperature for 4-5 hours. A viscous yellowish product is obtained containing 25.7% water. The potential of a half-wave reduction in 80% alcohol per background is 0.1 M LiCI 1.83 V. Molecular weight (cryoscopy in water) 510-520. The characteristic bands of 1640 and 1210 cm confirm the presence of С С and С-О-С (О) -groups. Next, a composition is prepared as in Example 1. Flexibility of an exposed 5 mm film according to the lUT-l gear. The proposed photopolymerizing composition allows photopolymer printing plates to be obtained with a resolution of 120 min / cm, an angle at the base of the printing elements 60-70, an exposure time of 2-3 minutes. Forms of voduvatsiya vodayut, NOY VS1DOY The table shows the data on the assessment of the flexibility of photopolymerizable films, prepared in accordance with the known and proposed composition. In air saturated with water vapor, both films are equally flexible, which is explained by the plasticizing action of water. However, in a dry atmosphere, films based on the known composition become brittle even with small bending forces. At a relative humidity of 65% of the film of the proposed composition is more flexible. Thus, the proposed photopolymerizing composition makes it possible to manufacture flexible photopolymerizable plates that do not require moisture before use.

Claims (1)

Claim A photopolymerizable composition, including hydrolyzed polyvinyl acetate, ethylene glycol monomethacrylic ester, benzoin methyl ester, hydroquinone and water, and so on, in order to increase the flexibility of photopolymerizable plates, it additionally contains a modified urea-formaldehyde formula: '' _ - Λ - /> s * o s o with with h ΝΗ NH _a NH ₂ Where 45 I - s-s-sssn _ъ 1-sn ₂ ; -s-gn = sn-sch _e , -s-sn: sn-s _b n ₅ 0 o about in the following ratio tov, parts by weight: Hydrolyzed poly komponen- vinyl acetate monomethacrylic ester 20-50 fifty ethylene glycol methyl ether 1-30 benzoin modified urine 1-5 formaldehyde wine 5-20 55 resin Hydroquinone 0.01-0.05 Water 50-80