Organopolysiloxane composition

 

(57) Abstract:

Organopolysiloxane composition contains, by weight.h.: polyorganosiloxane 100, polyorganosiloxane 0.2 to 3, oligodimetilsiloksana 0.2 to 1800, the platinum catalyst is from 0.01 to 1. The composition provides improved ability of the composition to cure in thick layers and in a confined space. 1 C.p. f-crystals, 2 tab.

The invention relates to the chemistry of polymers, and more specifically to organopolysiloxane compositions which can be used, in particular, to fill the electronic, optical fiber blocks, and also for filling shells of breast prostheses. This song relates to silicon-based gels (KG), which have recently found a wide application in various industries and science, for example, to protect various electronic assemblies and units from shock and vibration, as well as to create a dynamic optical models of solids. One of the first publications on the application KG in electronics made by PM Harper in the book "Fill electronic equipment synthetic resins, M. , S. 141-146, (1964) the Most complete in theory, the properties of the gels were investigated P. De amounts of frozen in the book "the Idea of scaling in visiva composition (Application N 63-35655 Japan, MCI C 08 L 83/05, declared 30.07.86,, RJ chemistry, abstract T, 1989), including polyorganosiloxane (PIC) with a viscosity 50-100000 JV, containing 0.1 to 0.8 of the vinyl groups associated with the Si atoms, and not containing other unsaturated aliphatic groups, polyorganosiloxane (PAGS) with a viscosity of 10-10000 JV, containing > 2 SiH groups, in a molar ratio of hydride and vinyl groups 0.7 to 2 : 1, and 10-6- 10-2% of the listed polymers catalyst (CT) reaction of the hydride connection (connection Pt, Pd, Rh).

However, when filling this song thick (more than 5-10 mm) layers in the volume of defects occur in the form of bubbles and cracks, and in the closed volume of the composition cures bad, which significantly limits its use.

An object of the invention is to improve the ability of the composition to cure in thick layers and in a confined space.

The technical result is achieved in that the organopolysiloxane composition comprising polyorganosiloxane with terminal vinyl groups, polyorganosiloxane and platinum catalyst additionally contains oligodimetilsiloksana (ODMS) in the following ratio, wt.h.:

Polyorganosiloxane - 1

In addition, the composition may further contain (to give the required color, conductivity, dielectric characteristics, etc.) fillers in an amount of from 0.1 to 150 wt. hours at 100 wt. including oligodimetilsiloksana (ODMS).

As polyorganosiloxane used as a compound of General formula R SiO[(CH3)2SiO]mSi-R, where m = 200-3000, R - triphenylsilane or dimethylphenylsilane; polyorganosiloxane General formula (CH3)3{[R'(H)SiO]for 0.4[SiO(CH3)2] for 0.6}xSi(CH3)3where x = 10 to 20, a R' is methyl, ethyl, phenyl, -cryptochromes; polyorganosiloxane General formula (CH3)3SiO[(CH3)2Si] nSi(CH3)3where n = 40 - 1000. As polyorganosiloxane use fluids PMS (TU 6-02-737-78).

As catalysts in the compositions using complex platinum compounds in which the ligands are organosilicon compounds of the General formula:

[(CH3)n(CH2=CH)3-nSi]2O

where n = 0 - 2.

In table 1 and 2 shows examples of the performance of the composition. The components of the compositions are mixed in required (see table 1 at the end of the description) ratios. After smesi erah 1 and 3 used the PIC with integral dimethylpolysiloxane, and in the other PIC with trivinylcyclohexane.

In examples 1 used ODMS, where R' is ethyl, in examples 2 and 4, R' is methyl, in example 5, R' is phenyl, in example 3, R' - -cryptochromes.

As filler in example 6 used the pigment cadmium yellow, in example 7, the titanium dioxide in example 8 - pigment cadmium red, in example 9 - white carbon black in example 10 to a mixture of the filler is titanium dioxide and cadmium red.

The compositions of examples 4 and 5 are not otvernylis, and the composition of the application 63-35655 in the volume of the bubbles have formed. In the compositions in examples 1-3 and 6-10 defects in the bulk and on the surface is not detected.

Values of modulus of elasticity E [kPa] of the obtained compositions are shown in table 2 (see end of description).

Line 1 corresponds to the samples, utverzhdennym in the open volume, line 2 is closed.

The modulus of elasticity was measured on test bench type Instron 1122. A spherical indenter of radius R immersed in the test material to a depth h. The elastic modulus E is calculated by the formula

< / BR>
where E is the modulus of elasticity and Poisson's ratios of the investigated material, F is the force acting on a spherical indenter of radius R when the immersion of the indenter in the investigated material is s, with the achievement of the technical result, which in this case should be at all surprising that, according to the authors, suggests the proposed solution meets the criterion of patentability "inventive step".

1. Organopolysiloxane composition comprising polyorganosiloxane with terminal vinyl groups, polyorganosiloxane and a platinum catalyst, characterized in that it further comprises the oligodimetilsiloksana in the following ratio, wt.h.:

Polyorganosiloxane - 100

Polyorganosiloxane - 0,2 - 3

The oligodimetilsiloksana - 0,2 - 1800

The platinum catalyst is 0.01 - 1

2. Organopolysiloxane composition under item 1, characterized in that it further contains an inorganic filler in an amount of from 0.1 to 150 wt.h. 100 hours oligodimetilsiloksana.

 

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