CN102382387A - Composition of halogen-free flame-retardant polystyrene plastic and preparation method thereof - Google Patents

Abstract

The invention discloses a formula and a preparation method of a halogen-free flame-retardant polystyrene plastic, which comprises 100 parts of polystyrene plastic, 15-30 parts of organic silicon rubber and its vulcanized crosslinking agent, and 0 parts of magnesium hydroxide. ~100 parts, red phosphorus 0~20 parts, toughening agent 5~15 parts, coupling agent 0.5 parts, processing aid 1~3 parts. The polystyrene plastic produced by the invention realizes non-halogenated flame retardancy, and can effectively reduce the addition of magnesium hydroxide under the condition of achieving the same flame retardancy effect, so as not to affect the mechanical properties and Processing performance. The halogen-free flame-retardant polystyrene plastic produced by the invention is used for the environment-friendly flame-retardant in the electric appliance field.

Description

Formula and preparation method of a kind of halogen-free flame-retardant polystyrene plastic

technical field

The invention relates to a flame-retardant plastic formulation and a preparation method thereof in the field of electrical appliances, more specifically, the invention relates to a formulation of a halogen-free flame-retardant polystyrene plastic and a preparation method thereof.

Background technique

Polystyrene plastics are widely used in the field of electrical appliances. It has good processing performance and electrical performance, and through certain coordination, it has excellent mechanical properties. However, polystyrene plastics without flame retardant treatment are very easy to catch fire. Its oxygen index is low, it is easy to catch fire, it has a large calorific value, and it emits dense black smoke when it burns. The requirements are very high, so polystyrene plastics without flame retardant treatment basically cannot be used in the field of electrical appliances.

In order to achieve the purpose of flame retardancy, polystyrene plastics generally adopt two methods. One is to add brominated flame retardants, which can improve the flame retardancy of polystyrene plastics without significantly reducing the physical properties of polystyrene plastics. and mechanical properties. However, studies have shown that the No. 1 killer of casualties at the fire scene is mainly the toxic gases released by combustion, one of which is the highly toxic hydrogen bromide gas released by brominated flame retardants at high temperatures, so brominated flame retardants At present, the brominated flame retardants are gradually being restricted, and brominated flame retardants can also generate highly toxic dioxins and other substances at high temperatures, which have a very serious impact on the environment. Strictly limit, on a global scale, the non-halogenation of flame retardant materials has become a consensus.

Another method is to add inorganic metal hydroxide to flame retardant, so as to achieve the purpose of halogen-free flame retardant. Using inorganic metal hydroxide as a flame retardant, when it is necessary to achieve a certain flame retardant effect, its dosage needs to reach more than 60% (weight percentage). If such a large amount of metal hydroxide is added to polystyrene plastics, it will seriously reduce The mechanical properties and processing properties of polystyrene plastics, studies have shown that the addition of 60% magnesium hydroxide will lead to a 30% decrease in the tensile strength of high-impact polystyrene (HIPS), and a 50% decrease in impact strength.

Contents of the invention

In view of the above problems, the present invention provides a formula and a preparation method of a halogen-free flame-retardant polystyrene plastic, and the flame-retardant polystyrene plastic produced by using it does not contain brominated flame retardants, and its metal hydrogen The addition of oxides is also low, which does not reduce the mechanical properties and processing properties of polystyrene plastics. Technical scheme of the present invention is:

A formulation of halogen-free flame-retardant polystyrene plastics, which comprises 100 parts of polystyrene plastics, 15-30 parts of silicone rubber and its vulcanized crosslinking agent, and 0-100 parts of magnesium hydroxide in parts by weight. 0-20 parts of red phosphorus, 5-15 parts of toughening agent, 0.5 parts of coupling agent, 1-3 parts of processing aid;

The processing aid, calculated in parts by weight, includes 1-2 parts of dispersant and 0.5-1 part of lubricant.

The polystyrene plastics are polystyrene (PS), high impact polystyrene (HIPS), block copolymer of styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene One or a mixture of any two or more of the block copolymers of ethylene-styrene (SBS).

Described toughening agent is the block copolymerization of high rubber powder, butadiene rubber, natural rubber, methyl methacrylate-butadiene-styrene terpolymer (MBS), styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene block copolymer (SEBS), acrylate series modifier (ACR) or a mixture of any two or more.

The coupling agent is one or a mixture of any two or more of silane coupling agent (KH550), titanate coupling agent, aluminate coupling agent and titanate coupling agent.

The dispersant is one of ethylene bis fatty acid amide (EBS), derivatives of ethylene bis fatty acid amide (EBS), and spreading oil, or a mixture of any two or more.

The lubricant is one or a mixture of any two or more of liquid paraffin, PE wax, oxidized PE wax, spermaceti, stearic acid, butyl stearate, zinc stearate, and calcium stearate.

Preferably, the coupling agent is a silane coupling agent (KH550), the dispersant is ethylene bis fatty acid amide (EBS), and the lubricant is liquid paraffin.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, magnesium hydroxide, red phosphorus, and a coupling agent are placed in a blender and stirred evenly to obtain a stirring material A; the stirring material A Mix and granulate with silicone rubber and its vulcanized crosslinking agent to obtain pellet B; extrude pellet B together with polystyrene plastic, toughener, dispersant, and lubricant through a twin-screw extruder Granulating to obtain halogen-free flame-retardant polystyrene plastics.

The mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an open mill or an internal mixer.

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising polystyrene plastics, silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus, and toughening agent in parts by weight of the above formula , coupling agent and processing aid are placed in a mixer and stirred evenly to obtain a stirring material; the stirring material is extruded and granulated through a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

The invention adopts the composite flame-retardant method of organic silicon rubber, magnesium hydroxide and red phosphorus, and can significantly reduce the amount of magnesium hydroxide when achieving the same flame-retardant effect, so as not to affect the mechanical properties of flame-retardant polystyrene plastics and processing performance, while realizing the non-halogenated flame retardancy of polystyrene plastics.

Description of drawings

No drawings.

Detailed ways

The present invention will be further described below in conjunction with specific examples, but the scope of protection claimed by the present invention is not limited to the scope expressed in the examples.

Embodiment 1 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 15 parts, 5 parts of toughening agent styrene-butadiene-styrene block copolymer (SBS), 0.5 part of silane coupling agent (KH550), 2 parts of ethylene bis fatty acid amide (EBS) and liquid paraffin 0.5 parts of processing aids composed of 2.5 parts.

A method for preparing halogen-free flame-retardant polystyrene plastics. According to the parts by weight of the above formula, the silane coupling agent (KH550), organic silicon rubber and its vulcanized crosslinking agent are mixed and granulated through an open mill , to obtain pellets B; pellets B and high impact polystyrene (HIPS), styrene-butadiene-styrene block copolymer (SBS), ethylene bis fatty acid amide (EBS), liquid paraffin Together, they are extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, styrene-butadiene - Styrene block copolymer (SBS), silane coupling agent (KH550), ethylene bisfatty acid amide (EBS), and liquid paraffin are placed in a mixer and stirred evenly to obtain a stirring material; the stirring material is extruded through a twin-screw Extrude and granulate to obtain halogen-free flame-retardant polystyrene plastics.

Embodiment 2 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 30 parts, 100 parts of magnesium hydroxide, 20 parts of red phosphorus, 15 parts of block copolymer (SBS) of toughening agent styrene-butadiene-styrene, 0.5 part of silane coupling agent (KH550), made of liquid paraffin 0.5 parts and 2.5 parts of processing aids composed of 2 parts of ethylene bis fatty acid amide (EBS).

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising placing magnesium hydroxide, red phosphorus, and a silane coupling agent (KH550) in a blender and stirring evenly according to the parts by weight of the above formula to obtain a stirring material A; Mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an internal mixer to obtain pellet B; pellet B is mixed with high impact polystyrene (HIPS), styrene-butadiene - Styrene block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus , the block copolymer (SBS) of styrene-butadiene-styrene, silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), liquid paraffin are placed in the stirrer and stir evenly, obtain stirring material; The mixing material is extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

Embodiment 3 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 22.5 parts, 70 parts of magnesium hydroxide, 8 parts of red phosphorus, 10 parts of block copolymer (SBS) of toughening agent styrene-butadiene-styrene, 0.5 part of silane coupling agent (KH550), made of liquid paraffin 0.5 parts and 2.5 parts of processing aids composed of 2 parts of ethylene bis fatty acid amide (EBS).

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising placing magnesium hydroxide, red phosphorus, and a silane coupling agent (KH550) in a blender and stirring evenly according to the parts by weight of the above formula to obtain a stirring material A; Mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an internal mixer to obtain pellet B; pellet B is mixed with high impact polystyrene (HIPS), styrene-butadiene - Styrene block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus , the block copolymer (SBS) of styrene-butadiene-styrene, silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), liquid paraffin are placed in the stirrer and stir evenly, obtain stirring material; The mixing material is extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

Embodiment 4 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 15 parts, 30 parts of magnesium hydroxide, 12 parts of red phosphorus, 10 parts of block copolymer (SBS) of toughening agent styrene-butadiene-styrene, 0.5 part of silane coupling agent (KH550), made of liquid paraffin 0.5 parts and 2.5 parts of processing aids composed of 2 parts of ethylene bis fatty acid amide (EBS).

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising placing magnesium hydroxide, red phosphorus, and a silane coupling agent (KH550) in a blender and stirring evenly according to the parts by weight of the above formula to obtain a stirring material A; Mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an internal mixer to obtain pellet B; pellet B is mixed with high impact polystyrene (HIPS), styrene-butadiene - Styrene block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus , the block copolymer (SBS) of styrene-butadiene-styrene, silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), liquid paraffin are placed in the stirrer and stir evenly, obtain stirring material; The mixing material is extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

Embodiment 5 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 15 parts, 40 parts of magnesium hydroxide, 10 parts of red phosphorus, 10 parts of block copolymer (SBS) of toughening agent styrene-butadiene-styrene, 0.5 part of silane coupling agent (KH550), made of liquid paraffin 0.5 parts and 2.5 parts of processing aids composed of 2 parts of ethylene bis fatty acid amide (EBS).

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising placing magnesium hydroxide, red phosphorus, and a silane coupling agent (KH550) in a blender and stirring evenly according to the parts by weight of the above formula to obtain a stirring material A; Mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an internal mixer to obtain pellet B; pellet B is mixed with high impact polystyrene (HIPS), styrene-butadiene - Styrene block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus , the block copolymer (SBS) of styrene-butadiene-styrene, silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), liquid paraffin are placed in the stirrer and stir evenly, obtain stirring material; The mixing material is extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

Embodiment 6 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 15 parts, 30 parts of magnesium hydroxide, 15 parts of red phosphorus, 10 parts of block copolymer (SBS) of toughening agent styrene-butadiene-styrene, 0.5 part of silane coupling agent (KH550), made of liquid paraffin 0.5 parts and 2.5 parts of processing aids composed of 2 parts of ethylene bis fatty acid amide (EBS).

A method for preparing halogen-free flame-retardant polystyrene plastics, comprising placing magnesium hydroxide, red phosphorus, and a silane coupling agent (KH550) in a blender and stirring evenly according to the parts by weight of the above formula to obtain a stirring material A; Mixing material A, silicone rubber and its vulcanized crosslinking agent are mixed and granulated by an internal mixer to obtain pellet B; pellet B is mixed with high impact polystyrene (HIPS), styrene-butadiene - Styrene block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, magnesium hydroxide, red phosphorus , the block copolymer (SBS) of styrene-butadiene-styrene, silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), liquid paraffin are placed in the stirrer and stir evenly, obtain stirring material; The mixing material is extruded and granulated by a twin-screw extruder to obtain a halogen-free flame-retardant polystyrene plastic.

Embodiment 7 of the present invention: a formula of halogen-free flame-retardant polystyrene plastics, which includes 100 parts of high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent in parts by weight 15 parts, 20 parts of red phosphorus, 10 parts of toughening agent styrene-butadiene-styrene block copolymer (SBS), 0.5 part of silane coupling agent (KH550), made of 0.5 part of liquid paraffin and ethylene bis 2.5 parts of processing aids composed of 2 parts of fatty acid amide (EBS).

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, red phosphorus and silane coupling agent (KH550) are placed in a blender and stirred evenly to obtain a stirring material A; the stirring material A Mix and granulate with silicone rubber and its vulcanized crosslinking agent through an open mill to obtain pellets B; mix pellets B with high-impact polystyrene (HIPS), styrene-butadiene-styrene Block copolymer (SBS), ethylene bisfatty acid amide (EBS), and liquid paraffin are extruded and granulated through a twin-screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

A preparation method of halogen-free flame-retardant polystyrene plastics, according to the parts by weight of the above formula, high-impact polystyrene (HIPS), silicone rubber and its vulcanized crosslinking agent, red phosphorus, styrene- Butadiene-styrene block copolymer (SBS), silane coupling agent (KH550), ethylene bis fatty acid amide (EBS), and liquid paraffin are placed in a mixer and stirred evenly to obtain a stirring material; the stirring material is passed through a double Extrude and granulate with a screw extruder to obtain halogen-free flame-retardant polystyrene plastics.

Each embodiment uses the above method to carry out mixing and granulation, and then prepare samples according to "GB/T 17037.1-1997 Preparation of Thermoplastic Material Injection Molding Samples Part 1 General Principles and Preparation of Multipurpose Samples and Strip Samples" , and then test the tensile strength of the sample according to "GB-T 1040-1992 Plastic Tensile Test Method", test the impact strength of the sample according to "GB/T 1843-1996 Plastic Izod Impact Test Method", according to "GB T 2408- 2008 Determination of Plastic Combustion Performance Horizontal and Vertical Method" Test the flame retardant performance of samples. The sample test results of each embodiment are shown in the table below.

Note: FH-4 means that the level of horizontal combustion is level 4, FV-0 means that the level of vertical burning test is level 0, and so on, if it can reach FV-0, it means that the flame retardant effect is very good.

Experimental results show that a kind of halogen-free flame-retardant polystyrene plastic of the present invention adopts the compound flame-retardant mode of silicone rubber, magnesium hydroxide and red phosphorus to have remarkable effect, and in the case of achieving the same flame-retardant effect, the formula of The addition amount of magnesium hydroxide can be significantly reduced, thereby not affecting the mechanical properties and processing properties of polystyrene plastics, and polystyrene plastics can also realize halogen-free flame retardancy.

Claims (10)

1. the prescription of halogen-free flameproof polystyrene type plastics calculates by weight, and it comprises 100 parts in polystyrene type plastics; 15～30 parts of organo-silicone rubber and vulcanization crosslinking agent thereof; 0～100 part of Marinco H, 0～20 part in red phosphorus, 5～15 parts of toughner; 0.5 part of coupling agent, 1～3 part of processing aid;

Said processing aid calculates by weight, comprises 1～2 part of dispersion agent, 0.5～1 part of lubricant.

2. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1; It is characterized in that a kind of or any two or more mixture in the segmented copolymer that said polystyrene type plastics are PS, high-impact polystyrene, styrene-ethylene-butadiene-styrene, the segmented copolymer of styrene-butadiene-styrene.

3. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1; It is characterized in that said toughner is a kind of in series modified dose of the high glue powder, cis-1,4-polybutadiene rubber, tree elastomer, TEB 3K-butadiene-styrene terpolymer, the segmented copolymer of styrene-butadiene-styrene, the segmented copolymer of styrene-ethylene-butadiene-styrene, esters of acrylic acid or two or more mixture arbitrarily.

4. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1 is characterized in that, said coupling agent is a kind of or any two or more mixture in silane coupling agent, titanate coupling agent, aluminate coupling agent, the titanium aluminic acid coupling agent.

5. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1 is characterized in that, said dispersion agent is the verivate of ethylene bis-fatty acid amides, ethylene bis-fatty acid amides, a kind of or any two or more mixture in the diffusion oil.

6. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1; It is characterized in that said lubricant is a kind of or any two or more mixture in whiteruss, PE wax, oxidation PE wax, spermaceti, Triple Pressed Stearic Acid, butyl stearate, Zinic stearas, the calcium stearate.

7. the prescription of halogen-free flameproof polystyrene type plastics as claimed in claim 1 is characterized in that, said coupling agent is a silane coupling agent, and dispersion agent is the ethylene bis-fatty acid amides, and lubricant is a whiteruss.

8. the preparation method of halogen-free flameproof polystyrene type plastics, the parts by weight according to the prescription of the described halogen-free flameproof polystyrene type of claim 1 plastics place stirrer to stir Marinco H, red phosphorus, coupling agent, obtain stirring material A; To stir material A and organo-silicone rubber and vulcanization crosslinking agent thereof and carry out mixing granulator, obtain pellet B; Pellet B is passed through the twin screw extruder extruding pelletization with polystyrene type plastics, toughner, dispersion agent, lubricant, obtain halogen-free flameproof polystyrene type plastics.

9. the preparation method of halogen-free flameproof polystyrene type plastics as claimed in claim 8 is characterized in that, stirs material A and organo-silicone rubber and vulcanization crosslinking agent thereof and carries out mixing granulator through mill or Banbury mixer.

10. the preparation method of halogen-free flameproof polystyrene type plastics; Parts by weight according to the prescription of the described halogen-free flameproof polystyrene type of claim 1 plastics; Place stirrer to stir polystyrene type plastics, organo-silicone rubber and vulcanization crosslinking agent thereof, Marinco H, red phosphorus, toughner, coupling agent, processing aid, obtain stirring material; To stir material through the twin screw extruder extruding pelletization, obtain halogen-free flameproof polystyrene type plastics.