RU2339662C1 - Epoxy binding agent for fiberglass - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention concerns epoxy binding agent for obtaining fiberglass on the basis of reinforcing filler for glass fiber cloth, glass fiber blanket, glass fiber roving etc, applied mainly in construction reinforcement applied under effect of aggressive media, and in obtaining high-strength fiberglass for various engineering, shipbuilding industries etc. Binding agent includes the following components, wt %: 56.11-56.42 of ED-22 epoxy resin, 42.10-42.29 of isomethyltetrahydrophthalic anhydride, 0.79 of UP-606/2 2,4,6-tris(dimethyl)phenol, 0.50-1.00 of polytriphenyl ether of boric acid.

EFFECT: enhanced physical and mechanical properties of binding agent, chemical resistance to aggressive media, and obtaining homogeneous and pore-free monoliths after thermal hardening.

2 tbl, 3 ex

Description

The invention relates to the production of fiberglass, in which fiberglass, fiberglass, glass roving, etc. are used as reinforcing fillers, intended primarily for use as structural reinforcement operating in aggressive environments, and can also be used for the manufacture of high-strength fiberglass for various branches of engineering, shipbuilding, etc.

Structural fiberglass based on continuous glass fibers has a high level of physicomechanical characteristics along the direction of the reinforcement axis (exceeding the strength of most structural steels), low thermal conductivity, relatively high dielectric constant, very small (compared with steels and high-strength materials) specific gravity. But despite all this, industry requires fiberglass with even higher physical and mechanical characteristics, in particular fiberglass, capable of resisting aggressive environments for a long time.

The widespread use of epoxy resins in various industries is associated with a specific set of technological and operational properties. Epoxy oligomers can be obtained both in liquid and in solid state. They cure in a wide temperature range using various classes of hardeners. Cured epoxides have high values of adhesive and cohesive strength, chemical and weather resistance.

Known technical polymer binders for fiberglass [1, 2, 3, 4, 5], where the main component of the binder is an epoxy resin.

Significant disadvantages of these technical solutions are:

- low strength characteristics of fiberglass;

- the presence in the composition of the binder of acetone and alcohol, causing low adhesion of the binder to fiberglass;

- low manufacturability due to too short or long gelation time of the binder;

- low coefficient of chemical aging of fiberglass;

- low adaptability of the binder associated with the synthesis of chlorinated complex.

Closest to the claimed composition is a polymer composition [6], comprising the following components in their ratio, parts by weight: 100 epoxy resin ED-20, 80 isomethyl tetrahydrophthalic anhydride, 5 EDOS plasticizer and 1.5, 2.4.6 tris (dimethylaminomethyl ) phenol UP-606/2.

The disadvantage of this technical solution [6] is the presence of an EDOS plasticizer, which is part of the composition, leading to a decrease in the elastic modulus, strength and durability of the epoxy composition [7] and evaporates over time from the composition of the cured composition.

The proposed technical solution is aimed at creating an epoxy composition for fiberglass, with improved physical and mechanical characteristics, high resistance to aggressive media, uniformity and porelessness after hot curing.

The binder for fiberglass includes, wt.%: 56,11-56,42 epoxy resin ED-22, 42,10-42,29 isomethyl tetrahydrophthalic anhydride, 0.79 polymerization accelerator 2,4,6-tris (dimethylaminomethyl) phenol UP- 606/2 and 0.5-1.0 polymethylene-p-triphenyl ester of boric acid. The new composition differs from the known additional content of polymethylene-p-triphenyl ester of boric acid in an amount of 0.5-1.0 wt.%, Which gives the binder improved physical and mechanical properties, high ability to resist the effects of aggressive environments.

The proposed binder for fiberglass is an epoxy composition that contains polymethylene-p-triphenyl ether of boric acid.

The proposed binder for fiberglass is an epoxy composition that contains polymethylene-p-triphenyl ester of boric acid (or polytriphenyl ester of boric acid).

The manufacture of an epoxy binder for fiberglass with a modifying additive of polymethylene-p-triphenyl ether of boric acid is carried out as follows.

Example 1

At the first stage, a portion of isomethyltetrahydrophthalic anhydride and polymethylene-p-triphenyl ester of boric acid are prepared. 42.29 wt.% Of isomethyltetrahydrophthalic anhydride is poured into a heated reactor with a stirrer, 0.50 wt.% Of polymethylene-p-triphenyl ester of boric acid is added, then stirring is carried out at a temperature of 60-65 ° C for 160-180 min until complete dissolution . Next, 56.42 wt.% Epoxy resin ED-22 and 0.79 wt.% 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2, preheated to 45 ° C, are added to the reactor. Then the binder is mixed for 4-5 minutes.

The resulting binder is poured into an impregnation bath through which the roving RBN 17-4800-202 is pulled. The impregnated glass roving is dried, molded and cured by a broach with a heating temperature from 50 ° C to 160 ° C at a heating rate of 10 ° C / min and subsequent exposure to 160 ± 2 ° C until completely cured, followed by cooling in air.

Example 2 is carried out analogously to example 1 in the following ratio of components, wt.%: Epoxy resin ED-22 56.28; isomethyl tetrahydrophthalic anhydride 42.18; 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2 0.79; 0.75 polymethylene-p-triphenyl ester of boric acid (according to table 1).

Example 3 is carried out analogously to example 1 in the following ratio of components, wt.%: Epoxy resin ED-22 56.11; isomethyl tetrahydrophthalic anhydride 42.10; 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2 0.79; polymethylene p-triphenyl ester of boric acid 1.0 (according to table 1).

Table 1 The content of polymethylene-p-triphenyl ester of boric acid in an epoxy binder for fiberglass and its effect on the quality of curing. Epoxy Binder Components Example 1 Example 2 Example 3 Polymethylene-p-triphenyl ester of boric acid, wt.% 0.50 0.75 1.00 Epoxy resin ED-22, wt.% 56.42 56.28 56.11 Isomethyltetrahydrophthalic anhydride, wt.% 42.29 42.18 42.10 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2, wt.% 0.79 0.79 0.79 Visually cured product quality Homogeneous non-porous monoliths Homogeneous non-porous monoliths Homogeneous non-porous monoliths

table 2 Physico-mechanical characteristics of fiberglass based on an epoxy binder with the addition of polymethylene-p-triphenyl ester of boric acid. Strength characteristics of fiberglass Example 1 Example 2 Example 3 The limit of compressive strength, MPa 608 739 566 Tensile stress, MPa 24340 25490 24460 Tensile strength in transverse bending, MPa 1857 1980 1808 The tensile strength after transverse bending after exposure to Ca (OH) ₂ at a temperature of 150 ° C for 14 hours, MPa 1199 1254 1061 The gelation time at a temperature of 120 ° C, min 5′28 ′ ′ 7′19 ′ ′ 8′53 ′ ′

The manufacturability assessment of epoxy binder samples was carried out by determining the gelation time at a temperature of 120 ° C (steel disk with a hole diameter of 20 mm and a depth of 5 mm); physical and mechanical parameters of the obtained fiberglass samples were evaluated by determining the compressive strength, tensile stress, tensile strength in transverse bending; the influence of aggressive media on fiberglass samples was evaluated by chemical aging in Ca (OH) ₂ medium at a temperature of 150 ° C for 14 hours and determining the tensile strength in lateral bending.

The test results are shown in table 2. From the data of table 2 it is obvious that samples with the addition of polymethylene-p-triphenyl ester of boric acid in an amount of 0.75 wt.% Have higher physical and mechanical characteristics compared to other samples, where weighed the amount of 0.5 wt.% and 1.0 wt.%.

The proposed cured epoxy composition (example 1, 2, 3) is of high quality - a non-porous, uniform material after hot curing.

The obtained samples (example 1, 2, 3) have significantly high physical and mechanical characteristics of fiberglass in comparison with the known epoxy binders, and thus, the proposed technical solution allows us to recommend the obtained new epoxy binder for fiberglass as a new hot cure binder with high physical and mechanical properties, uniformity, porosity and chemical resistance to aggressive environments.

The obtained binder for fiberglass was tested in laboratory conditions of the department of HTVMS of Biysk Technological Institute, and in November 2006 it was put into production on the experimental line for the production of fiberglass reinforcement of Biysk Fiberglass Plant LLC.

Bibliography

1. Patent SU 1024479 from 06.23.1983.

2. Patent RU 2028334 dated 02/09/1995.

3. Patent SU 975749 from 11.23.1982.

4. Patent RU 2172328 of 08.20.2001.

5. Lensky M.A., Belousov A.M., Ananiev E.S., Ishkov A.V. Synthesis and study of heat-resistant boron-containing phenol-formaldehyde resin // Tomsk State University Bulletin. Bulletin of operational scientific information. "Composite materials for special purposes." Tomsk: Tomsk State University, 2006. No. 65. S.66-70.

6. Patent RU 2160291 dated 10.12.2000.

7. Encyclopedia of Polymers / Ed. V.A. Kabanova et al. - M.: Soviet Encyclopedia. - 1974.V.2. - 1032 s.

Claims (1)

An epoxy binder for fiberglass, including an epoxy resin, isomethyltetrahydrophthalic anhydride and 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2, characterized in that it contains an ED-22 epoxy resin, in addition polythenyl boric acid when the following ratio of components, wt.%: Epoxy resin ED-22 56.11-56.42 Isomethyltetrahydrophthalic anhydride 42.10-42.29 2,4,6-tris (dimethylaminomethyl) phenol UP-606/2 0.79 Polytriphenyl Boric Acid 0.50-1.00