CN105601769A - Graft latex coagulation method for improving primary color of ABS resin - Google Patents

Abstract

The invention discloses a graft latex coagulation method for improving the primary color of ABS resin, and relates to the field of polymer synthetic resin chemical technologies. The method includes the following steps of firstly, adding an SFS solution to HRG latex to be evenly stirred for standby application, adding a certain amount of deionized water and a certain amount of flocculating agent to a three-opening bottle, starting to conduct stirring, heating the mixture to 85 DEG C, adding HRG latex; secondly, conducting coagulation reaction for 10-15 min at a temperature of 85-90 DEG C, conducting curing reaction for 15-20 min at a temperature of 90-95 DEG C, adding a certain amount of deionized water to the three-opening bottle, and conducting cooling for 5-10 min; thirdly, conducting washing and dehydration on obtained sizing to obtain ABS graft wet powder, conducting drying through a constant-temperature oven, and mixing and extruding dried latex powder and SAN resin. Because SFS is added, the L value of ABS resin is increased, the yellow color index is decreased, and the primary color of ABS resin is improved to a certain degree.

Description

A kind of graft latex condensing method that improves ABS resin primary colours

Technical field

The present invention relates to high molecular synthetic resin technical field of chemistry, particularly relate to one and improve ABS (propyleneNitrile-butadiene-styrene terpolymer) the graft latex condensing method of resin primary colours, belong to emulsion coagulation skillArt field.

Background technology

ABS resin typically refers to polybutadiene graft phenylethene, acrylonitrile copolymer and styrene-acrylonitrile tripFrom the mixture of copolymer (SAN). ABS resin is a kind of plastic material of function admirable, and it not only has goodGood mechanical performance and moulding processability, and product surface good luster, be easy to dye and plating placeReason, has become widely used thermoplastic engineering plastic. But along with user increases day by day to product qualityThe aggravation year by year that requires and compete, the quality of product also more and more demonstrates the advantage in market competition.

When the apparent properties such as the jaundice of ABS resin product or product aberration are unstable are not ideal, can apply productHave a negative impact. The apparent property of ABS resin mainly comprises color and the brightness of resin, according to Lab aberrationTesting standard is exactly to solve the problem that ABS resin L value is low and yellow colour index is high, realizes and improves ABS resin baseLook, the object of raising naval stores apparent property.

The ABS resin production technology of main flow at present, for emulsion graft polymerization-body SAN blending method is prepared ABS resin lifeProduction. art, its main preparation methods is graft copolymerization styrene and acrylonitrile on polybutadiene emulsion particle, obtainsThe higher ABS graft latex (HRG) of rubber content, graft latex through condense dry after, the ABS obtaining connectsBranch powder carries out physical blending with SAN resin again, melt extrudes granulation and obtains through extruder. To ABSThe whole production technology of resin is progressively analyzed according to mode from back to front, is ensureing processing conditions, SANUnder the prerequisite of resin quality in more excellent state, graft latex cohesion process has larger shadow to product apparent propertyRing.

Summary of the invention

In view of above demand, the invention provides a kind of graft latex condensing method that improves ABS resin primary colours.In HRG latex, add sodium sulfoxylate formaldehyde (SFS), can effectively suppress the color producing species in following process processThe generation of matter, thus ABS resin primary colours improved.

For achieving the above object, the graft latex condensing method that improves ABS resin primary colours provided by the invention,Its technical recipe mainly comprises following component, is expressed as with parts by weight:

Wherein, described graft latex (HRG) is graft copolymerization styrene and acrylonitrile on polybutadiene emulsion particleThe ABS graft latex obtaining;

Wherein, described flocculant is sulfuric acid or phosphoric acid;

Wherein, described SFS is sodium sulfoxylate formaldehyde;

Described method is carried out in the steps below:

(1) SFS solution is added in HRG latex, stir stand-by, by a certain amount of deionized water and flocculantAdd in there-necked flask, open and stir, be heated to 85 DEG C, add HRG latex;

(2) aggregation 10～15min at 85～90 DEG C, slaking reaction 15～20min at 90～95 DEG C,In the most backward there-necked flask, add a certain amount of deionized water, cooling 5～10min;

(3) to gained slurry wash, processed, obtain ABS grafting wet mash, then use constant temperature ovenBe dried to moisture lower than 1%, the rubber powder after oven dry and SAN resin carry out according to a certain percentage blending and extrude.

The graft latex condensing method that improves ABS resin primary colours provided by the invention, due to adding of SFS,The L value that has improved ABS resin, has reduced yellow colour index, has improved to a certain extent ABS resin primary colours.

Detailed description of the invention

Embodiment 1

In HRG latex, add SFS, by following formula, latex condensed, be expressed as with parts by weight:

The ABS grafting powder that cohesion is obtained, melt extrudes according to resins for universal use formula and SAN resinous blending,And be injection molded into test sample, and exemplar and pellet to be tested, test result is as shown in table 1 below.

The ABS resin performance indications that table 1: embodiment 1 provides

Project	Test method	ABS resin (not adding SFS)	ABS resin (adding SFS)
				Yield stress MPa	ASTM D638	46	46.7
Fracture strength MPa	ASTM D638	36.2	35.7
				Impact strength J/m	ASTM D256	226	232
Flow coefficient g/10min	ASTM D1238	19.9	20.3
				Colour table L value	ASTM D1925	81.5	82.6
Colour table a value	ASTM D1925	0.15	-0.14
				Colour table b value	ASTM D1925	11.3	11.6
Yellow colour index	ASTM D1925	23.94	22.43

Embodiment 2

In HRG latex, add SFS, by following formula, latex condensed:

The ABS grafting powder that cohesion is obtained, melt extrudes according to resins for universal use formula and SAN resinous blending,And be injection molded into test sample, and exemplar and pellet to be tested, test result is as shown in table 2 below.

The ABS resin performance indications that table 2: embodiment 2 provides

Project	Test method	ABS resin (not adding SFS)	ABS resin (adding SFS)
				Yield stress MPa	ASTM D638	46	45.3
Fracture strength MPa	ASTM D638	36.2	33.2
				Impact strength J/m	ASTM D256	226	216
Flow coefficient g/10min	ASTM D1238	19.9	20.3
				Colour table L value	ASTM D1925	81.5	83.5
Colour table a value	ASTM D1925	0.15	-0.3
				Colour table b value	ASTM D1925	11.3	10.9
Yellow colour index	ASTM D1925	23.94	20.9

The above, be only better case study on implementation of the present invention, be not the present invention is done other forms ofRestriction, any those skilled in the art may utilize the technology contents of above-mentioned announcement changed or changeType is the equivalent case study on implementation of equivalent variations. But every invention technical scheme content that do not depart from, according to thisAny simple modification, equivalent variations and remodeling that bright technical spirit is done above case study on implementation, still belong toThe protection domain of technical solution of the present invention.

Claims (5)

1. a graft latex condensing method that improves ABS resin primary colours, its technical recipe mainly comprises followingComponent, is expressed as with parts by weight:

Wherein, described graft latex HRG is that on polybutadiene emulsion particle, graft copolymerization styrene and acrylonitrile obtainThe ABS graft latex arriving;

Described method is carried out in the steps below:

(1) SFS solution is added in HRG latex, stir stand-by, by a certain amount of deionized water and flocculantAdd in there-necked flask, open and stir, be heated to 85 DEG C, add HRG latex;

(2) aggregation 10～15min at 85～90 DEG C, slaking reaction 15～20min at 90～95 DEG C,In the most backward there-necked flask, add a certain amount of deionized water, cooling 5～10min;

(3) to gained slurry wash, processed, obtain ABS grafting wet mash, then use constant temperature ovenBe dried to moisture lower than 1%, the rubber powder after oven dry and SAN resin carry out according to a certain percentage blending and extrude.

2. a kind of graft latex condensing method that improves ABS resin primary colours according to claim 1, itsBe characterised in that, described flocculant is sulfuric acid or phosphoric acid.

3. a kind of graft latex condensing method that improves ABS resin primary colours according to claim 1, itsBe characterised in that, described SFS is sodium sulfoxylate formaldehyde.

4. a kind of graft latex condensing method that improves ABS resin primary colours according to claim 1, itsBe characterised in that, its technical recipe mainly comprises following component, is expressed as with parts by weight:

5. a kind of graft latex condensing method that improves ABS resin primary colours according to claim 1, itsBe characterised in that, its technical recipe mainly comprises following component, is expressed as with parts by weight: