SU378402A1 - METHOD OF GLUING AND SEALING - Google Patents

Description

one

The invention 1 involves gluing, sealing, sealing parts from various materials, such as metal, wood, silicate and organic glass, plastic and rubber.

A known method of sealing is that the sealing compound is applied to the surface and cured in the absence of oxygen. As a sealing agent, oligoester acrylates are the products of the interaction of dicarboxylic acids with glycols in the presence of acrylic or methacrylic acid, for example, dimethacrylate-bis (ethylene glycol) phthalate, α-pininate, α-sebacinate, and accelerators, and accelerators are tertiary. oligoether weight. An essential component in the composition of a joint is organic hydroperoxide.

To increase the viability, various glycols are added to the composition. Various thickening agents, naryider lolistirol, are used as thickeners in the known "omscitations".

Adding any compounds to the composition reduces the strength characteristics of the sealing or adhesive layer.

In order to increase the adhesiveness of the glue line under anaerobic conditions, it is recommended to apply COMBINATIONS, in which the curing base is oligoetriacrylates, the molecule of which contains one or several nitrogen atoms - oligoaminoetherylacryls of the general formula

С-СОО R-R OOCRaCOO ,,

-NR,

X

R-N-ROOCC-Cn ,,

II

R, X

where X is H, CH3 Cl, CN;

R is an aliphatic divalent radical; Ri - alkyl, alkanol or radical -

X

1 ROOGC CH2;

Ra - aliphatic or aromatic

a bivalent radical; 25p-1, 2,3,4 ...

The proposed compounds have the property to self-cure in the absence of air oxygen without the addition of any accelerators or initiators. Thus, with oligoamine 30 naufiracrylate a-then-di-1-methacryl-bis- (tr1-etaiolamine) phthalate is cured between steel plates in a few hours. After 24 hours, the shear strength () of the cured layer reaches 66 kgf / cm. When all hydroxyl groups are replaced by meta-acrylate groups, the shear strength decreases, so the shear strength of steel plates when otverhnen-; between them "," -dimethacryl-bis- (methacryltriethanolamine) phthalate within 24 hours reaches only 2 kgf / cm. Adding peroxide compounds to oligoamino ether acrylates speeds up the curing process, the results are shown in the table. (au-dimethacryl-bys (triethanolamine) phthalate containing 2 wt.% of hydroperoxide. the resin hardened between the steel plates. after 20 hours is equal to 120 kgf / cm.

In order to increase viability, inhibitors, for example hydroquinone, are added to oligoamine osefins. Adding 0.02 wt. The viability of hydroquinone increases from several hours to several months (see table).

Offered oligoamino ethers as the basis of the curing layer exclude Composition and properties of compositions

The use of additives such as polymerization accelerators, thickeners, and a significantly smaller amount of peroxide initiators is required in the volatilization site.

The best method for obtaining olito-amino esters is the joint transester- ization of alkyl dicarboxylic acids and α, / 3 - unsaturated monocarboxylic acids with alkanol mines in the presence of friable catalysts. As the ratio of the components, it is possible to obtain oligoaminosylase with various degrees of nicondensation and viscosity. The viscosity of oligoaminoether acrylates varies from several hundred to several tens of thousands of hours of siticase. Therefore, oligoamino ester acrylates as sealing compounds should exclude the use of thickeners. The ratio of reagents to the synthesis of oligoaminoesteric acrylates can be controlled by the number of remaining unsubstituted OH-groups, which makes it possible to obtain oligoaminoether acrylates with different strengths of the cured layer for shear or to break when they are used as adhesives and sealants.

Polyamino ether with a degree of polycondensacin n - 2.

Example 1. Determination of shear strength.

A cough of FG-2.46 composition is applied to the treated (processing precision V10) and cleaned steel plate 50x20x1.0 mm. Cough smear evenly on 1/2 of the surface of the plate, which impose another similar plate and in the same position they are kept at room temperature for 20 hours. Then, on the thinning machine Z MD-2.5, according to GOST 9438-60, the strength of the cured layer is determined. It is equal to 129 kgf. Similarly, other compositions are tested on steel or copper plates. The results are shown in the table.

Example 2. Determination of torque.

For the purpose of testing, steel bolts with a nut, non-oxidized, of normal production M 10x1 with a square or hexagon head are used. Paresis must be free from defects or chips. The bolts must remain until they are consumed with the nut screwed in such a way that the cut part of the bolt extends 13-15 mm. For testing impose PGP2,46, so as to cover the fully protruding part of bolt cutting. The nut is unscrewed until it is flush with the ends of the bolt and then re-screwed until the bolt cut protrudes 3-5 mm to ensure full coverage of the screwing zone with polyaminoether acrylate. Samples incubated at 18-21 ° C for 24 hours. After this period, the nut is unscrewed with a special torque wrench, determining the amount of unscrewing moment.

The cure time is the time during which the steel plates (used in example 1) are glued together so that they cannot be separated with a little effort by hand.

Subject invention

The method of pasting and sealing by applying oligoester acrylates to the bonding surfaces with addition of a polymerization initiator with subsequent contacting of surfaces, characterized in that oligoamino etryrilates are used to increase the strength of the adhesive joint under anaerobic conditions

CH2 C-COOrR-N-ROOCRaCOOJn: I

XR,

X I R-N-ROOCC CH2

Ri

where X is H, CH3, CN, Cl;

R is an aliphatic divalent radical;

Ri is alkyl, alkanol or radical X I ROOC: C CH2;

R2-aliphatic or aromatic

a bivalent radical; p 1,2,3,4.