CN-122011720-A - Halogen-free flame-retardant PC/ABS alloy and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant PC/ABS alloy and a preparation method thereof, belonging to the technical field of PC/ABS alloy, and comprising PC resin and ABS resin, a flame retardant synergist and a processing aid; the mass ratio of the total mass of the PC resin and the ABS resin to the total mass of the flame retardant and the flame retardant synergist is 70-80: 20-30; the flame retardant is app@melamine-tannic acid-Fe; the halogen-free flame-retardant PC/ABS alloy provided by the invention has high-efficiency flame-retardant characteristics and good mechanical properties, has important engineering value and practical significance, and contains a flame retardant and a flame-retardant synergist which are compounded for use, so that the flame-retardant efficiency is obviously improved under the premise of ensuring the good mechanical properties of the material.

Inventors

• WANG ZHENFEI
• WANG XIULEI

Assignees

• 太和县白云塑业有限公司

Dates

Publication Date

20260512

Application Date

20260325

Claims (10)

1. 1. The halogen-free flame-retardant PC/ABS alloy is characterized by comprising PC resin, ABS resin, flame retardant synergist and processing aid, wherein the mass ratio of the total mass of the PC resin to the total mass of the ABS resin to the total mass of the flame retardant to the flame retardant synergist is 70-80:20-30, the flame retardant is APP@melamine-tannic acid-Fe, and the flame retardant synergist is DOPO-polyborosiloxane.
2. 2. The halogen-free flame retardant PC/ABS alloy according to claim 1, wherein the addition amount of the flame retardant synergist is 8% -10% of the mass of the flame retardant.
3. 3. The halogen-free flame retardant PC/ABS alloy according to claim 1, wherein the mass ratio of the PC resin to the ABS resin is 65-75:25-35.
4. 4. The halogen-free flame retardant PC/ABS alloy according to claim 1 wherein the flame retardant is prepared by the steps of: S1, dissolving melamine and tannic acid in an absolute ethyl alcohol/water mixed solvent, stirring at 40 ℃ until the melamine and the tannic acid are completely dissolved, slowly dropwise adding a FeCl 3 solution, maintaining the pH value at 4.5+/-0.3 by using a 10% acetic acid solution in the dropwise adding process, and continuing stirring for reaction after the dropwise adding is finished to obtain a melamine-tannic acid-Fe pre-dispersion solution; s2, dispersing APP in an absolute ethyl alcohol/water mixed solvent, stirring, and then performing ultrasonic dispersion to obtain APP dispersion; And step S3, slowly dripping the melamine-tannic acid-Fe pre-dispersion solution in the step S1 into the APP dispersion liquid in the step S2, stirring for reaction, maintaining the pH value in the reaction process to be 4.5-5.0, and obtaining the flame retardant after the reaction is finished.
5. 5. The halogen-free flame retardant PC/ABS alloy according to claim 1, wherein the molar ratio of tannic acid to Fe3 + is 1:2.5-3; the dosage mass ratio of melamine, tannic acid and APP is 1.5:3-4:45; the mass fraction of APP in the APP dispersion is 30% -35%.
6. 6. The halogen-free flame retardant PC/ABS alloy according to claim 1 wherein the flame retardant synergist is prepared by the steps of: Mixing boric acid and toluene under the protection of nitrogen, stirring and dispersing at room temperature to obtain a dispersion liquid, dissolving DOPO silane coupling agent in toluene, adding the dispersion liquid, and carrying out reflux reaction for 10-12h to obtain the flame-retardant synergist.
7. 7. The halogen-free flame retardant PC/ABS alloy according to claim 1, wherein the mass ratio of boric acid to DOPO silane coupling agent is 0.6-0.7g:4.5g.
8. 8. A halogen-free flame retardant PC/ABS alloy according to claim 1, wherein, The auxiliary agent accounts for 1 to 1.5 percent of the total mass of the halogen-free flame-retardant PC/ABS alloy; the processing aid comprises a lubricant, a dispersing agent and an antioxidant, wherein the mass ratio of the lubricant to the dispersing agent to the antioxidant is 0.2:0.1:0.2.
9. 9. A method for preparing the halogen-free flame retardant PC/ABS alloy according to any one of claims 1 to 8, comprising the steps of: Uniformly mixing ABS resin, PC resin, a flame retardant synergist and an auxiliary agent, pouring into a double-screw extruder, extruding, molding, cooling and granulating to prepare the halogen-free flame retardant PAC/ABS alloy.
10. 10. The method for preparing a halogen-free flame retardant PC/ABS alloy according to claim 9, wherein the extrusion molding temperature is in the range of 180-240 ℃.

Description

Halogen-free flame-retardant PC/ABS alloy and preparation method thereof Technical Field The invention belongs to the technical field of PC/ABS alloy, and particularly relates to a halogen-free flame-retardant PC/ABS alloy and a preparation method thereof. Background Polycarbonate/(acrylonitrile-butadiene-styrene) copolymer (PC/ABS) alloys are an important thermoplastic engineering plastic whose combination of properties benefit from the excellent heat resistance, dimensional stability and impact toughness provided by the polycarbonate component, as well as the good processing flow and surface gloss imparted by the ABS resin component. Based on the performance advantages, the alloy material is widely applied in the fields of automobile manufacturing, electronic and electric appliances, building materials and the like. However, the inherent flammability characteristics of PC/ABS alloys are a critical obstacle to their use in higher safety requirements. Specifically, the material has a fast flame propagation rate in the combustion process, and is accompanied by release of a large amount of harmful gas and smoke, so that the fire safety hidden trouble caused by the release of the harmful gas and smoke seriously limits the further expansion of the application range of the material. Aiming at the inflammable defect of PC/ABS alloy, the prior art mainly adds flame retardant to endow the material with flame retardancy, self-extinguishing property and smoke abatement performance. The early widely adopted halogen flame retardant, such as decabromodiphenyl ether, tetrabromobisphenol A and the like, has higher flame retardant efficiency, but has increasingly obvious environmental and health hidden trouble, namely, the smoke generation amount in the combustion process is large, the released hydrogen halide gas is easy to absorb moisture to form strong corrosive halogen acid to cause secondary damage, and meanwhile, part of brominated flame retardant has the risk of degradation to generate polybrominated dibenzodioxane (PBDD), polybrominated dibenzofuran (PBDF) and other highly toxic byproducts in the hot working process. In view of the increasing severity of environmental regulations and the development trend of green manufacturing, halogen-free flame retardance has become the main stream direction of flame retardance modification of PC/ABS alloy. In the halogen-free flame retardant technology system, phosphate compounds are widely studied for their good flame retardant efficiency and relatively excellent environmental compatibility. The flame retarding mechanism mainly relates to promotion of char formation in the condensed phase and free radical capture in the gas phase. However, conventional phosphate flame retardants, including triphenyl phosphate (TPP), resorcinol bis (diphenyl phosphate) (RDP), bisphenol a bis (diphenyl phosphate) (BDP), and the like, have significant technical limitations when applied to PC/ABS alloys. In order to meet the requirement of UL94V-0 grade flame retardance, the addition amount of the phosphate flame retardant is generally more than 10-15 wt%. The compatibility problem between the flame retardant and the polycarbonate matrix is remarkably solved due to the high addition amount, namely, the damage of phosphate molecules to the action of hydrogen bonds and Van der Waals force among polycarbonate molecular chains is remarkably solved, the entanglement density of the molecular chains is reduced, the thermal deformation temperature of the material is remarkably reduced, the heat resistance is deteriorated, and meanwhile, the small molecular plasticizing effect of the phosphate and the phase interface defect caused by the small molecular plasticizing effect of the phosphate block an energy dissipation mechanism under the action of impact load, so that the notch impact strength of the material is remarkably reduced. In addition, the addition of high phosphate content may cause problems such as excessively low melt viscosity, reduced processing dimensional stability, surface precipitation, and degradation of hydrolysis resistance. In summary, the existing phosphate flame-retardant system is often required to sacrifice the inherent heat resistance and mechanical properties of the material while improving the flame retardant property of the PC/ABS alloy. How to maintain high-efficiency flame retardance and effectively inhibit the negative influence of the flame retardance on the comprehensive performance of a matrix material becomes a breakthrough problem in the technical field of flame retardance modification of the current PC/ABS alloy. Disclosure of Invention The invention aims to provide a halogen-free flame-retardant PC/ABS alloy and a preparation method thereof, so as to solve the problem of poor flame retardant property of the PC/ABS alloy. The aim of the invention can be achieved by the following technical scheme: the invention provides a halogen-free flame-retardant PC/ABS alloy, which