SU1454820A1 - Mouldable composition - Google Patents

Abstract

The invention relates to polyethylene terephthalate-based molding materials that are used to manufacture structural electrical products. The invention allows the temperature of the injection mold to be reduced (up to 75-80 ° C), eliminates burr during casting, increases the mechanical strength (toughness, stress stress during stretching and bending), and heat resistance (up to 240 ° C) of the material due to the fact that casting composition, incl. azop1; a, mac: polyethylene terephthalate 60-70j glass fiber copolyester and nucleating agent, contains co-polyester based on ethylene glycol, dimethyl terephthalate and sebacic acid (5-7) and additionally epoxidized phenol formaldehyde ny novolak 0.5-1.0. 2 tab. (L

Description

one

The invention relates to polyethylene terephthalate (PET) -based molding materials that are used to manufacture structural electrical products. five

The aim of the invention is to reduce the temperature of the casting mold, to eliminate shrinkage during casting, to increase the mechanical strength and heat resistance of the material.

The co-ester TF-60 used in the composition is the product of the interaction of ethylene glycol (12 mas, hours, sebacic acid (9.99 mas, parts) and dimethyl terephthalate (14.4 may. Hours). In 15 as epoxidized phenol form-aldehyde Novolak use 5H resin or UP-643 resin containing at least 18% epoxy groups.

The viscous resins of 5 N or UP-643 are introduced into the composition in the form of 8-10% concentrated, the waste in crushed PET to particles is 1 mm.

As the nucleating agent, sodium stearate or talc is used.

Example 1. Mixed in a paddle mixer 20 wt.h. PET with a characteristic viscosity of 0.58 dl / g (in a mixture of phenol tetrachloroethane 60:40) and a molecular weight of 17,000, 30 wt.h. fiberglass (chopped dosing type 4-88), 7.0 wt.h. e-polyester TF-60 (mp. 160 C) 110.5 mas. hours. emols 5 N (epoxy number 18.6%, viscosity 1.34 Pa), 0.3 mash. one; Fiberglass is predominantly dosed into the raplav. The mixture is extruded, put at 260-270 ° C, granulated and from 1454820

At 260–270 ° C (mold temperature 70–80 ° C), the specimens are tested.

Example 2. A casting composition is obtained as in Example 1, but instead of resin 5 N (viscous liquid) 0.5 m.ch. Resins UP-643.

Example 3. A casting composition is obtained as in Example 1, but 5 wt.h. TF-60.

Example 4. A casting composition is obtained as in Example 1, but 1.0 wt.h. resin 5 N.

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zpoxidated novolac is not administered.

The compositions and properties of glass-cast molding compositions are presented in Table. 1, their properties in table 2.

Claims (1)

Invention Formula A molding composition comprising poly (ethylene terephthalate), glass fiber, a copolymer and a nucleating agent, such that in order to reduce the casting temperature. Example fc J niA wi woj-iM ..., - 5. Get control of the 15th form, eliminating plume f,. GGLLPILG composition of 70 mac. PET, May 30, h. fiberglass and 0.5 mah.h. talcum powder The resulting mixture is extruded worse, the thread is constantly cut off, has a rough surface. 20 Granulation is difficult due to the brittleness of the thread (many extrudates are 5-10 cm long), the glass fiber is squeezed out during the casting of the samples, polymeric oil flows out, each 2-3 casting does not fill the whole network or has a large break. Recycling is almost impossible. 6. Get cast Example composition, as in example 1, but without TF-60. Etc thirty and measure 7. Get the cast the composition as in example 1, 1. but in it increases the mechanical strength and heat resistance of the material; it contains a copolymer based on ethylene glycol, dimethyl terephthalate and sebacic acid as a copolymer, and additionally - oxidized phenol formaldehyde novolac in the following ratio of components, ma.ch .: Polyethylene terephthalate Glass fiber Ethylene glycol, dimethyl terephthalate and its baccinic acid based copolymer 5-7 Epoxy phenol formaldehyde novolak 0.5-1.0 Forming agent 0.2-0.4 60-70 30-40 zpoxidated novolac is not administered. The compositions and properties of glass-cast molding compositions are presented in Table. 1, their properties in table 2. Invention Formula A casting composition comprising poly (ethylene terephthalate), glass fiber, a copolymer and a nucleating agent, such that, in order to reduce the casting temperature, 5 forms, elimination of obolo,. GGLPILG 0 25 thirty it increases the mechanical strength and heat resistance of the material; it contains a copolymer based on ethylene glycol, dimethyl terephthalate and sebacic acid as a copolymer, and additionally - oxidized phenol formaldehyde novolac in the following ratio of components, ma.ch .: Polyethylene terephthalate Glass fiber Ethylene glycol, dimethyl terephthalate and its baccinic acid based copolymer 5-7 Epoxy phenol formaldehyde novolak 0.5-1.0 Forming agent 0.2-0.4 60-70 30-40 Components Content-konjonentov, mac., By examples one . ZZrirJlLlLilfiniZI: 11ETF Fiberglass Sopolifir TF-60 Sopolifir Epoxidized phenol-novolk novolak: 5-H resin ta-643 resin. - 0.5 Sodium Stearate Talc 70 70 70 70 70 70 70 70 70 70 70 70 70 7065.8 30 30 30 30 30 30 30 AO 30 30 30 30 30 3030.0 5 7 - - 7 6 7 67 8 3 7 7 .-------- 4.0  o, 5 0.5 0.5 1.0 - 0.5 - 0.5 1.0 0.7 0.7 0.5 0.5 1.5 - 0,4 , 3 0.3 0.3 0.3 0.3 o, ... °: L.: L- °: - -0, .2 Table Famous composition - 0,4 .. °: L.: L- °: - -0, .2 le a s t; YU " H