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Pultrusion PU (polyurethane) resin composite material and preparation method thereof

A polyurethane resin and composite material technology, which is applied in the field of polyurethane resin for pultrusion, can solve the problems of slow curing speed, poor mechanical properties of unsaturated polyester, and decreased strength, so as to improve wetting ability, strength and toughness, and prolong service life Effect

Inactive Publication Date: 2016-02-17
许劼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unsaturated polyester has poor mechanical properties and cannot be used in some occasions that require high mechanical properties, and the curing agent is peroxide, which is flammable and explosive, and processing has certain dangers
Epoxy resin is a high-performance resin, but its price is expensive, its curing speed is slow, and because of its high cross-linking, the material is hard and brittle, and its toughness is insufficient
In the traditional polyurethane resin system, under the influence of long-term ultraviolet light and high temperature, the benzene ring structure in a large number of aromatic isocyanates is prone to isomerization, and is further photooxidized, and the hard segment benzene ring structure is destroyed. , the strength of the entire molecule will be greatly reduced, thus affecting the mechanical strength of the entire composite material, which greatly limits the application of polyurethane composite materials in the field and in the open air (such as solar brackets, utility poles, door and window frames, cable brackets, etc.), and reduces the Service life of polyurethane composites

Method used

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  • Pultrusion PU (polyurethane) resin composite material and preparation method thereof

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preparation example Construction

[0066] The present invention also relates to the preparation method of the composite material of above-mentioned polyurethane resin for pultrusion, comprising the following steps:

[0067] The aliphatic isocyanate with a weight fraction of 60%-100% and the primary hydroxyl polyether or primary hydroxyl polyester with a weight fraction of 0%-40% that can improve the mechanical strength of aliphatic polyurethane and have end groups that can react with isocyanates Formation of isocyanate prepolymers;

[0068] Polymerization of isocyanate prepolymers to form composites of polyurethane resins for pultrusion.

[0069] Preferably, said polymerizing the isocyanate prepolymer to form a composite material of polyurethane resin for pultrusion includes:

[0070] Put the isocyanate prepolymer in the barrel of the injection machine A;

[0071] 80-100 parts by weight of polyols, 0-10 parts by weight of chain extenders, 0.1-1 parts by weight of catalysts, 0.1-2 parts by weight of hydroxyaci...

Embodiment 1

[0076]Black material: prepolymer formed by IPDI and PTMG1000 (PTMG1000, converted into liquid at 60°C, dehydrated under high temperature and reduced pressure at 110°C, cooled to 60°C, added IPDI, kept stirring at 75°C for 80 minutes), wherein the weight ratio of IPDI and PTMG1000 is 110:20, NCO% is about 30%, put the black material in the A barrel. White material: DMN-60050 parts, DMN-45048 parts, glycerin 2 parts, after high temperature 110 ℃ vacuum dehydration cooling treatment, add catalyst UL-290.3 parts, Bicat-80.05 parts, Bicatz0.1 parts, 1 part of lactic acid (Dehydration treatment at low temperature at 50°C), 2 parts of molecular sieve, 2 parts of internal release agent Q2-51862, 0.5 part of paraffin powder, 1.5 parts of nano-titanium dioxide, 3.5 parts of nano-calcium carbonate, put the white material in B barrel and mix well. Mix the components in the A barrel and the B barrel with a weight ratio of 150:100 and inject them into the injection box through the glue inje...

Embodiment 2

[0078] Black material: prepolymer formed by IPDI and 7201A (7201A is transformed into liquid at 60°C, dehydrated at 110°C, cooled to 75°C, added with IPDI, kept at 75°C and stirred for 2 hours), wherein the weight ratio of IPDI to 7201A is 110 : 40, NCO% is about 26%, and the black material is placed in the A barrel. White material: DMN-60050 parts, DMN-45048 parts, 2 parts of glycerin, after high temperature 110 ℃ vacuum dehydration cooling treatment, add catalyst UL-290.5 parts, Bicat-80.05 parts, Bicatz0.1 parts, 1 part of lactic acid (low temperature 50°C dehydration treatment), 2 parts of molecular sieve, 3 parts of internal release agent INT-1948MCH, 0.5 parts of paraffin powder, 1.5 parts of nano-titanium dioxide, 3.5 parts of nano-calcium carbonate, put the white material in the B barrel and mix well. Mix the components in the A barrel and the B barrel with a weight ratio of 170:100 through the glue injection machine and inject it into the glue injection box, and impre...

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Abstract

The invention relates to the technical field of pultrusion PU (polyurethane) resin, in particular to a pultrusion PU resin composite material and a preparation method thereof. According to the pultrusion PU resin composite material, reinforced fibers and PU resin in a proper ratio are adopted, wherein the PU resin adopts aliphatic isocyanates to replace conventional aromatic isocyanates, further, primary hydroxyl polyether or primary hydroxyl polyester capable of improving mechanical strength of aliphatic PU and having a terminal group capable of reacting with isocyanates is added to form prepolymers, primary hydroxyl polyether or primary hydroxyl polyester having the terminal group capable of reacting with the isocyanates can improve the mechanical strength of aliphatic PU, and the aliphatic isocyanates have low probability of photooxidation, so that the service life of the composite material in wild and outdoor application is prolonged.

Description

technical field [0001] The invention relates to the technical field of polyurethane resin for pultrusion, in particular to a composite material of polyurethane resin for pultrusion and a preparation method thereof. Background technique [0002] Pultrusion composite materials are composed of various resins and high-performance fibers. Existing resins for pultrusion include unsaturated polyester, epoxy resin, polyurethane, etc. Unsaturated polyester has poor mechanical properties and cannot be used in some occasions that require high mechanical properties, and the curing agent is peroxide, which is flammable and explosive, and processing has certain risks. Epoxy resin is a high-performance resin, but its price is expensive, its curing speed is slow, and because of its high cross-linking, the material is hard and brittle, and its toughness is insufficient. In the traditional polyurethane resin system, under the influence of long-term ultraviolet light and high temperature, the...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L75/08C08L75/06C08G18/75C08G18/73C08G18/66C08G18/48C08G18/42C08G18/10C08K7/14
Inventor 许劼
Owner 许劼
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