Method of obtaining compounded foam polyurethane

FIELD: chemistry.

SUBSTANCE: invention concerns method of obtaining compounded foam polyurethanes for operation as shock, heat and sound absorbing layers. Compounded foam polyurethanes are obtained by interaction of 100 weight parts of polyol component and 20 weight parts of polyisocyanate component, where polyol component is mixed preliminarily with 70-100 weight parts of rubber chips, and reaction mix is foamed and solidified at 160C or higher to component destruction temperature. Butadiene and piperylene copolymer with 1200-3200 molecular weight and 0.8-1.1% content of hydroxylic groups is used as polyol component, and polymethylenepolyphenylisocyanate with 29-31% content of isocyanate groups is used as polyisocyanate component.

EFFECT: simplified composition and technological process for mix processing in elastic foam material production, facilitated utilisation of rubber industry waste, particularly rubber chips, and higher compounding degree and tension at 40% compression of foam polyurethanes obtained by the claimed method.

2 ex, 3 tbl

 

The invention relates to a method for producing flexible foams, designed to work as a shock-absorbing, heat - and sound-insulating layer.

Known composition for the manufacture of shock-absorbing polyurethane foams and method of reception by mixing polyetherpolyols with a molecular weight in the range 100-20000 at a temperature of 20-25C With a catalyst, surface-active agent, the polymer increases the stickiness of the resin, foaming agent, and an aromatic polyisocyanate, followed by foaming in a mold at a temperature of 20-50C. (U.S. Pat. RF 2291170, MKI 7 C08L 75/08, C08G 18/48, C08J 9/00, 10.01.2007).

However, this method does not allow to produce filled with polyurethane foam.

Known composition and method (U.S. Pat. RF 2152960, MKI 7 C08G 18/69, C08L 75/12, C08G 18/69, C08G 101/00, 20.07.2000) to obtain a flexible polyurethane foam by mixing the hydroxyl-containing oligomer, isocyanate component, a catalyst, water, prestabilization and glycerine of the following composition, wt. including:

A copolymer of butadiene and piperylene
with a molecular mass of 1200-3200 and
the content of hydroxyl groups of 0.8 and 1.1%100
Polymethylenepolyphenylisocyanate
the content of isocyanate groups 29-31%23-46
ORGANOTIN and/or
amine catalyst0,085-3,000
Water1,0-2,5
Prestabilization - Etanol DC-10
the basis of the product gidroksietilirovaniya
higher fatty alcohols0,2-0,8
Glycerin0,5-4,0
2,6-Ditretbutyl-4-METHYLPHENOL or
1,4-benzenediol0.5 to 1.5

The disadvantage of this method is the relatively high viscosity of the composition is that it is not possible to produce filled with polyurethane foam.

Closest to the present invention is a method of producing elastic polyurethane foam by mixing polyol as one component, a polyisocyanate component, foaming substances, including liquid carbon dioxide, Katalizator, perhaps, auxiliary chemicals at a pressure sufficient to maintain the carbon dioxide in the liquid state, and the pressure decrease and the interaction of the mixture with an elastic penopoliuretana, in which the polyol as one component includes a polymer polyol comprising at least a simple polyetherpolyols, having an average nominal functionality of at least 2.5 and containing buried in it from 2 to 50 wt.% polymer particles based on the total weight of the polymer polyol, the amount of polymer particles does not exceed 50 microns (U.S. Pat. RF 2222552, MKI 7 C08J 9/12, C08G 18/48, C08G 18/46, 27.01.2004).

The disadvantage of this method is the complexity of instrumentation associated with the use of liquid carbon dioxide, and the restriction on the use of polymer fillers with larger particle size, such as rubber crumb, which in turn yields a foam with a low unit rate compression.

Thus, the known methods do not allow to obtain a polyurethane foam containing coarse polymeric fillers, which reduces their consumption and performance. In addition, known methods for producing foams require the use of foaming agents.

Cause that impede the achievement of the desired technical result ol the use of known methods for producing polyurethane foams, is the high viscosity of the filled compositions, which is 25-300 PAC. generally, the viscosity of the compositions for the preparation of polyurethane foams is 5-12 PAS.

In this regard, an important task is to develop a new way of getting filled with polyurethane foam, which would be recycled mixtures containing coarse polymeric fillers and allowed to refuse the use of foaming agents.

The technical result of the proposed method is the possibility of recycling of rubber crumb getting filled with polyurethane foam with the desired combination of properties, including composition of waste rubber industry, and the refusal of expensive foaming agents.

The technical result is achieved by conducting interaction polyol as one component with the polyisocyanate component, the polyol as one component used is a copolymer of butadiene and piperylene with a molecular mass of 1200-3200 and the content of hydroxyl groups of 0.8-1.1%, and as a polyisocyanate component polymethylenepolyphenylisocyanate with the content of isocyanate groups 29-31%, and polyol as one component pre-mixed with rubber crumb and the reaction mixture foamed and utverjdayut at a temperature of from 160C to the temperature of decomposition of the components in the composition, in the following ratio, wt. including:

A copolymer of butadiene and piperylene
with a molecular mass of 1200-3200 and
the content of hydroxyl groups of 0.8 and 1.1%100
Polymethylenepolyphenylisocyanate
the content of isocyanate groups 29 - 31%20
Crumb rubber70-100

The invention consists in that when heated the reaction mixture to 160C and above there is a substantial decrease in the viscosity of the mixture. In the reaction mixture intensive processes of desorption of the dissolved copolymer of butadiene and piperylene gas of low molecular weight impurities and the products formed during curing of the polyurethane foam that provides the foaming mixture. Formed cross-links during interaction polyol as one component with the polyisocyanate component is securely fixed to the porous structure of the material, providing filled with polyurethane foam, consisting of waste rubber industry, imenno rubber crumb.

In the proposed method uses the following components.

As gidroksilsodyerzhascimi component used rubber butadiene-piperylene low-molecular SKDP-N (TU 2294-076-05766741-97). The ratio of monomers to 50:50, molecular weight 1200-3200, the content of hydroxyl groups of 0.8-1.1%, with a dynamic viscosity at 20C 7-14 PAS.

As the isocyanate component is used polymethylenepolyphenylisocyanate received by postironium condensation products of aniline and formaldehyde (TU 113-03-38-106-90), the content of isocyanate groups 29-31%, the content of 4,4'-diphenylmethanediisocyanate 50-60%. Can be used with other brands of polyisocyanates based on 4,4'-diphenylmethanediisocyanate.

The filler - rubber crumb obtained by shredding used tires, sled cameras, rubber tread, tyre, vulcanized waste production (TU 38-00149438-48-92 "rubber crushed") with particle sizes of 0.5 to 2.0 mm Can be used and other crumb rubber obtained by grinding vulcanized rubber waste, in particular on THE 38-108015-87 "crushed rubber sports track or on THE 38-108035-97 "crushed rubber stamps RD, RDS, RJ".

Rubber crumb take in the amount of 70-100 wt. hours at 100 wt. including polyol as one component that is optimal for the development of elastic materials containing g is bidisperse polymer fillers.

The method of obtaining filled with polyurethane foam is as follows. In the mixer load polyol as one component and rubber crumb. The duration of mixing for 5-10 minutes. In the resulting suspension is injected polyisocyanate component and stirred until homogenization within 3-5 minutes. The mixture is then poured into the prepared pan and maintained at a temperature of 160C for 60 minutes.

The samples are tested according to GOST 409-77 "Plastic mesh and rubber sponge. The method of determining the apparent density", GOST 11721-78 "porous rubber. The method of determining uprugoopticheskii tensile property", GOST 27110-86 "rubber. The method of determining the elasticity to rebound on the device type Shoba," GOST 26605-93 "Polymer elastic porous materials. The definition according to the stress-strain behavior in compression and tension compression".

The invention is illustrated by the following examples.

Example 1. Prepare a mixture in accordance with table 1. The foaming and curing of the compositions is carried out at a temperature of 160C for 60 minutes. Physico-mechanical properties of the resulting filled elastic foams are given in table 2.

Example 2. Prepare a mixture of 1 (table 1), changing the temperature and duration of the foaming and curing of the composition. Physico-mechanical properties of the obtained foams Pref is found in table 3.

Table 1
The compositions
Examples
Name of the component
12345
Polyol as one component100100100100100
Polyisocyanate component2020202020
Crumb rubber70758090100

Table 2
Properties of compositions
The placeholderExamples
Indicators
(Path)12345
The content of polymer
filler
% (polyol)
10,541,242,944,447,450,0
Apparent density,
kg/m3
the 15.6600590560600700
Elongation
at break, %
1107570706570
The elastic rebound,
%
-142030 4035
Conditional strength
the tensile strength, kPa
92809010010080
The voltage at 40%
compression kPa
2,95,35,66,16,25,8

Table 3
Properties of the compositions according to example 2
Indicators12345678
The foaming temperature and
curing C
160160160160170170170155
The duration of the foaming and curing, minutes6050708040506080
Apparent density, kg/m3600_*6006105805905801180
Elongation
at break, %
75_*7570807580110
Ball rebound resilience, %14_*151514142035
Conditional strength
the tensile strength, kPa
80_* 7982758080100
The voltage at 40%
compression kPa
5,3_*5,3the 5.75,25,25,6_**
Notes:
* - the mixture cures,
**- the material is solid.

From the data of table 2 and 3 shows that the implementation of the proposed method is possible at temperatures of 160C and above. When carrying out the process at temperatures below 160C without special foaming agents derived monolithic materials.

Penopoliuretany obtained in example 1, have a higher 3.9-4.8 times the degree of filling compared with the known method, are elastic porous materials with higher (1.8-2.1 times) voltage at 40% compression compared with the known method. The upper temperature limit obtain foams of the proposed method is limited by the temperature of destruction of the ingredients included in the composition of the mixture.

In addition, using the proposed method allows to simplify the composition and techno is agicheskii the processing of the mixture in the manufacture of flexible foam, because of the prescription are excluded catalyst and a blowing agent, which reduces the requirements for a valid time intervals of mixing and molding a polyurethane composites by increasing the survivability of the prepared mixture.

Thus, the above data confirm that the implementation of the use of the claimed invention, the following cumulative conditions:

the method embodying the claimed invention in its implementation, allows to obtain porous materials based on full mixes;

the claimed invention allows to obtain an elastic shock-absorbing, heat - and sound-insulating coating;

for the claimed invention in the form as it is described in the independent clause following claims, confirmed the possibility of its implementation using the above described in the application or known before the priority date tools and methods;

the tool embodying the claimed invention in its implementation, is able to achieve perceived by the applicant of the technical result.

Therefore, the claimed invention meets the requirement of "industrial applicability" under the current law.

The method of obtaining filled with polyurethane foam by reacting polyol as one component with a polyisocyanate comp is the component, characterized in that as a polyol as one component used is a copolymer of butadiene and piperylene with a molecular mass of 1200-3200 and the content of hydroxyl groups of 0.8-1.1%, and as a polyisocyanate component polymethylenepolyphenylisocyanate with the content of isocyanate groups 29-31%, and polyol as one component pre-mixed with rubber crumb and the reaction mixture foamed and utverjdayut at a temperature of from 160C to the temperature of decomposition of the components that are included in the following ratio, parts by weight:

A copolymer of butadiene and piperylene
with a molecular mass of 1200-3200 and
the content of hydroxyl groups of 0.8 and 1.1%100
Polymethylenepolyphenylisocyanate
the content of isocyanate groups 29-31%20
Crumb rubber70-100



 

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