CN102964860B - Halogen-free flame retardant wood-plastic composite material made by expansive type fire retardant and preparation method thereof - Google Patents

Abstract

A halogen-free flame-retardant wood-plastic composite material is prepared by using an intumescent flame retardant and a preparation method thereof. The invention relates to a halogen-free flame-retardant wood-plastic composite material and a preparation method thereof. The components and parts by weight of the composite material are: 20-30 parts of polyethylene resin, 50-70 parts of wood powder, and compounded expansion type halogen-free flame-retardant 20-30 parts of agent, 1-3 parts of compatibilizer PE-g-MAH, 0.5-1 part of antioxidant 1010, 1680.5-1 part of antioxidant, 2-5 parts of lubricant, 0.5-1 part of anti-ultraviolet agent. It is mixed with polyethylene resin, wood flour, grafts and other processing aids to obtain a non-toxic compound through the steps of high mixer mixing, twin-screw extruder extrusion granulation, and conical twin-screw extruder extrusion molding. Halogen flame retardant wood plastic composite. The product produced by the method of the invention has light color, good wood imitation effect, excellent flame retardant properties such as self-extinguishing after leaving the fire, and small smoke generation, and can reach the V-0 flame retardant level of the vertical combustion test.

Description

Preparation of halogen-free flame-retardant wood-plastic composite material by using intumescent flame retardant and its preparation method

technical field

The invention relates to a halogen-free flame-retardant wood-plastic composite material and a preparation method thereof, in particular to a halogen-free flame-retardant wood-plastic composite material prepared by utilizing an intumescent flame retardant and a preparation method thereof.

Background technique

Wood-plastic composite material is a kind of basic material that covers a wide range of products and has a variety of shapes and structures. It fully embodies the advanced concepts of sustainable economic development such as circular economy, resource utilization, health and environmental protection, and conservation and substitution. Most of its products have the function of comprehensive utilization of resources and the resulting protection of the environment, so it has gradually attracted the attention of the society in recent years. The current Chinese government's concept of "circular economy" and "building a conservation-oriented society" has added a powerful driving force to the development of my country's wood-plastic industry.

With the improvement of people's attention to environmental resources, the circular economic development model centered on the recycling of waste materials and comprehensive utilization of resources has become the trend of world economic development. Vigorously developing resource recycling technologies will have a profound impact on national economic development and sustainable environmental development. The use of waste plastics and wood fibers to produce wood-plastic composite products is a good project to meet this requirement. In China, a considerable amount of various waste plastics and wood fiber wastes are generated every year. However, because the domestic market is still in its infancy, wood-plastic products have not been widely promoted in the domestic market. Compared with the North American market in the Chinese market, there is still considerable room for growth of wood-plastic composite materials and finished products. the

At present, the domestically developed wood-plastic materials include structural, decorative, packaging and special types, including wires, profiles, plates and profiled materials, and their scope of application can cover almost all logs and plastics. , plastic steel, aluminum alloy and other similar composite materials are currently used. The application range of wood-plastic materials that has been involved includes: dado, window sill, door cover, floor, corridor, partition, ceiling, guardrail, edge wrapping, fence, trestle, bathroom, door and window cover, rest pavilion, garage, ship Deck, furniture trim, water passage, open-air seats, stair steps, open-air platforms, container decking, stadium seats, light rail sound insulation walls, multi-functional wall partitions, highway sound insulation walls, etc., and began to penetrate into construction, home improvement, and logistics , Packaging, gardening, municipal administration, environmental protection and other industries, the annual GDP is increasing year by year, and the market prospect is very broad.

However, since the main raw material plant fibers and plastics (especially polyolefin plastics) in wood-plastic composite materials are combustible and combustible materials, wood-plastic composite materials do not have flame retardancy and have fire safety hazards. To a certain extent, the application of this green environmental protection product is limited.

At present, the flame retardant of wood-plastic composite materials mostly adopts the traditional flame retardant technology of polymers, and basically does not pay attention to the characteristics of wood-plastic composite materials, so the flame retardant effect obtained is not good, or the cost performance is too low . How to develop a flame-retardant technology suitable for wood-plastic composites is an urgent problem to be solved. In addition, due to the high flame-retardant efficiency of red phosphorus, most flame-retardant wood-plastic products are added with red phosphorus. Although it can meet the flame-retardant requirements of composite materials, the color of the product is dyed dark red by red phosphorus, which limits the its scope of application.

Contents of the invention

The object of the present invention is to provide a halogen-free flame-retardant wood-plastic composite material prepared by using an intumescent flame retardant and a preparation method thereof. Ammonium polyphosphate and melamine phosphate are used as halogen-free intumescent flame retardants, which greatly reduce the generation of toxic and corrosive gases during combustion. The halogen-free flame-retardant wood-plastic composite material product produced by the method has light color, wood-like effect, self-extinguishing when away from fire, and small smoke generation, and can reach the V-0 flame-retardant level of the vertical combustion test.

The purpose of the present invention is achieved through the following technical solutions:

Utilize intumescent flame retardant to prepare halogen-free flame-retardant wood-plastic composite material, the components and parts by weight of the composite material are: 20-30 parts of polyethylene resin, 50-70 parts of wood flour, compounded intumescent halogen-free Flame retardant 20-30 parts, compatibilizer PE-g-MAH is polyethylene followed by maleic anhydride 1-3 parts, antioxidant 1010 is tetrakis[β-(3,5-di-tert-butyl-4-hydroxy 0.5-1 part of phenyl) propionic acid] pentaerythritol ester, 0.5-1 part of antioxidant 168, that is, 0.5-1 part of tris (2,4-di-tert-butylphenyl) phosphite, 2-5 parts of lubricant, 0.5 part of anti-ultraviolet agent -1 copy.

The method for preparing a halogen-free flame-retardant wood-plastic composite material using an intumescent flame retardant, wherein the compounded intumescent halogen-free flame retardant in the material is a mixture of ammonium polyphosphate and melamine phosphate, wherein the ammonium polyphosphate The parts by weight are 15-20 parts, and the parts by weight of melamine phosphate are 5-15 parts.

A method for preparing a halogen-free flame-retardant wood-plastic composite material using an intumescent flame retardant, the method comprising the following preparation process: mixing ammonium polyphosphate and melamine phosphate in proportion to obtain a compound intumescent halogen-free flame retardant, and then mixing it with Polyethylene resin, wood flour, grafts and additives can be mixed by a high-speed mixer, extruded and granulated by a twin-screw extruder, and extruded and formed by a conical twin-screw extruder.

Advantage and effect of the present invention are:

1. The ammonium polyphosphate and melamine phosphate used in the present invention belong to halogen-free intumescent flame retardants, which contain two flame-retardant elements, phosphorus and nitrogen, and have the characteristics of high flame-retardant efficiency, halogen-free, low smoke, and low toxicity. It meets the requirements of today's people to protect the ecological environment. Intumescent flame retardants form a dense porous carbon foam layer on the surface of the material through the synergistic effect of acid source, carbon source, and gas source when the polymer is burned. The release of gas to the surface, in turn, blocks the transfer of heat to the polymer and the source of oxygen, thereby preventing the spread and propagation of the flame. Compared with traditional halogen flame retardants, this flame retardant greatly reduces the generation of toxic and corrosive gases during combustion.

2. The halogen-free flame-retardant wood-plastic composite material product produced by the method of the present invention has light color, good imitation wood effect, excellent flame-retardant properties such as self-extinguishing after leaving the fire, and low smoke generation, and can reach V-0 in the vertical combustion test Class flame retardant grade.

3. The process route of the present invention is simple, the product quality is stable, and it is suitable for industrialized production.

Detailed ways

The present invention will be further described below in conjunction with specific examples, but the implementation of the present invention is not limited thereto.

Example 1:

Weigh 20 kilograms of high-density polyethylene resin, 50 kilograms of wood powder, 6 kilograms of processing aids, 20 kilograms of ammonium polyphosphate, and 8 kilograms of melamine phosphate, mix the materials in a high-mixer for 10 minutes, and pass through a twin-screw extruder under certain conditions. Bottom extrusion granulation, conical twin-screw extruder extrusion molding, the product is sampled and made into a standard sample for vertical combustion test, the sample is self-extinguishing after leaving the fire, all of which can reach the UL94 V-0 flame retardant level.

Example 2:

Weigh 25 kilograms of high-density polyethylene resin, 60 kilograms of wood powder, 8 kilograms of processing aids, 30 kilograms of ammonium polyphosphate, and 10 kilograms of melamine phosphate, mix the materials in the high-mixer for 10 minutes, and pass through the twin-screw extruder under certain conditions. Bottom extrusion granulation, conical twin-screw extruder extrusion molding, the product is sampled and made into a standard sample for vertical combustion test, the sample is self-extinguishing after leaving the fire, all of which can reach the UL94 V-0 flame retardant level.

Claims (2)

1. utilize expansion type flame retardant to prepare halogen-free flame-retardant wood-plastic composite material, it is characterized in that, the component of described matrix material and parts by weight are: polyvinyl resin 20-30 part, wood powder 50-70 part, composite expanding halide-free fire-retardant 20-30 part, compatilizer PE-g-MAH and polyethylene connect maleic anhydride 1-3 part, antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.5-1 part, irgasfos 168 that is three (2,4-di-tert-butyl-phenyl) phosphorous acid ester 0.5-1 part, lubricant 2-5 part, anti UV agent 0.5-1 part;

In described material, composite expanding halide-free fire-retardant is the mixture of ammonium polyphosphate and melamine phosphate, and wherein the parts by weight of ammonium polyphosphate are 15-20 part, and the parts by weight of melamine phosphate are 5-15 part.

2. utilize expansion type flame retardant to prepare the method for halogen-free flame-retardant wood-plastic composite material, it is characterized in that, described method comprises following preparation process: ammonium polyphosphate and melamine phosphate are proportionally mixed to get composite expanding halide-free fire-retardant, then with polyvinyl resin, wood powder, grafts and auxiliary agent through high mixer batch mixing, twin screw extruder extruding pelletization, conical double screw extruder extrusion moulding step;

In described material, composite expanding halide-free fire-retardant is the mixture of ammonium polyphosphate and melamine phosphate, and wherein the parts by weight of ammonium polyphosphate are 15-20 part, and the parts by weight of melamine phosphate are 5-15 part;

The component of described halogen-free flame-retardant wood-plastic composite material and parts by weight are: polyvinyl resin 20-30 part, wood powder 50-70 part, composite expanding halide-free fire-retardant 20-30 part, compatilizer PE-g-MAH and polyethylene connect maleic anhydride 1-3 part, antioxidant 1010 i.e. four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 0.5-1 part, irgasfos 168 that is three (2,4-di-tert-butyl-phenyl) phosphorous acid ester 0.5-1 part, lubricant 2-5 part, anti UV agent 0.5-1 part;

Described grafts is Research of Grafting Malaic Anhydride Onto Polyethylene, and auxiliary agent is antioxidant 1010, irgasfos 168, lubricant and anti UV agent.