PVC easy-to-process opaque high-impact MBS and preparation method thereof

Abstract

The invention discloses a PVC easy-to-process opaque high-impact MBS and a preparation method thereof, and relates to the technical field of PVC auxiliary agent production and preparation. The PVC easy-to-process opaque high impact MBS is a core-nuclear-shell three-layer structure, and the PVC easy-to-process opaque high impact MBS comprises the following components in percent by mass: 1-20% of acore layer structure, 70-85% of a nuclear layer structure, and 5-20% of a shell layer structure; the core layer structure is a semi-rigid light cross-linking copolymer of a styrene monomer and an acrylate monomer, and the ratio of the styrene monomer to the acrylate monomer is 95 / 5-5 / 95; the core layer structure is a relatively soft light cross-linking butadiene styrene polymer with relatively lowglass transition temperature, and the ratio of butadiene and styrene is 100 / 0-80 / 20; and the shell layer structure is a copolymer with relatively high glass transition temperature of styrene, butyl acrylate and methyl methacrylate, and the mass percentages of styrene, butyl acrylate and methyl methacrylate are respectively 0.2-5%, 0.2-2% and 13-20%. Problems of low impact strength, poor processing fluidity and the like of existing MBS products for opaque PVC products are solved.

Description

technical field

[0001] The invention relates to the technical field of production and preparation of PVC additives, in particular to a PVC easy-to-process opaque high-impact MBS and a preparation method thereof. Background technique

[0002] Among the toughening materials of PVC, methyl methacrylate-butadiene-styrene polymer (MBS) is a relatively important class, which is divided into transparent products and opaque products. MBS used for opaque PVC products mainly requires its impact resistance and fluidity during processing. Excellent impact resistance and processing fluidity are the goals that are currently being pursued.

[0003] MBS resin is a functional polymer material synthesized on the basis of the concept of particle design. It is a ternary polymer prepared by emulsion graft polymerization. It has a typical core-shell structure in submicroscopic form, and the core of the particle is lightly cross-linked. The styrene-butadiene rubber core with low shear modulus mai...

Examples

Embodiment 1

[0030] (1) Add the formula amount of water, emulsifier, inorganic salt, molecular weight regulator, styrene monomer and butyl acrylate monomer in a ratio of 95 / 5, crosslinking agent, initiator to the reactor, and then close Reactor cover, heat up to the reaction temperature to react until the reaction is complete; or use a reactor alone to react, take the reacted emulsion of the formula amount and add it to the MBS reactor as the core layer seed, and the core layer accounts for 10%;

[0031] (2) Add the prescribed amount of water, emulsifier, inorganic salt solution, 10% core layer seeds, molecular weight modifier, crosslinking agent, and initiator into the autoclave, then close the lid of the autoclave and tighten the bolts, Then put butadiene and styrene into the reactor, wherein the ratio of butadiene and styrene is 95 / 5, and the middle layer accounts for 75%;

[0032] (3) Heat up to 70°C and react until the reaction is complete;

[0033] (4) Then add emulsifier, the mixtu...

Embodiment 2

[0036] In the step (1) of Example 1, the ratio of styrene monomer and butyl acrylate monomer in the core layer was changed to 75 / 25, and the rest were the same as in Example 1.

Embodiment 3

[0038] In the step (1) of Example 1, the ratio of styrene monomer and butyl acrylate monomer in the core layer was changed to 50 / 50, and the rest were the same as in Example 1.

technical field

[0001] The invention relates to the technical field of production and preparation of PVC additives, in particular to a PVC easy-to-process opaque high-impact MBS and a preparation method thereof. Background technique

[0002] Among the toughening materials of PVC, methyl methacrylate-butadiene-styrene polymer (MBS) is a relatively important class, which is divided into transparent products and opaque products. MBS used for opaque PVC products mainly requires its impact resistance and fluidity during processing. Excellent impact resistance and processing fluidity are the goals that are currently being pursued.

[0003] MBS resin is a functional polymer material synthesized on the basis of the concept of particle design. It is a ternary polymer prepared by emulsion graft polymerization. It has a typical core-shell structure in submicroscopic form, and the core of the particle is lightly cross-linked. The styrene-butadiene rubber core with low shear modulus mai...

Examples

Embodiment 1

[0030] (1) Add the formula amount of water, emulsifier, inorganic salt, molecular weight regulator, styrene monomer and butyl acrylate monomer in a ratio of 95 / 5, crosslinking agent, initiator to the reactor, and then close Reactor cover, heat up to the reaction temperature to react until the reaction is complete; or use a reactor alone to react, take the reacted emulsion of the formula amount and add it to the MBS reactor as the core layer seed, and the core layer accounts for 10%;

[0031] (2) Add the prescribed amount of water, emulsifier, inorganic salt solution, 10% core layer seeds, molecular weight modifier, crosslinking agent, and initiator into the autoclave, then close the lid of the autoclave and tighten the bolts, Then put butadiene and styrene into the reactor, wherein the ratio of butadiene and styrene is 95 / 5, and the middle layer accounts for 75%;

[0032] (3) Heat up to 70°C and react until the reaction is complete;

[0033] (4) Then add emulsifier, the mixtu...

Embodiment 2

[0036] In the step (1) of Example 1, the ratio of styrene monomer and butyl acrylate monomer in the core layer was changed to 75 / 25, and the rest were the same as in Example 1.

Embodiment 3

[0038] In the step (1) of Example 1, the ratio of styrene monomer and butyl acrylate monomer in the core layer was changed to 50 / 50, and the rest were the same as in Example 1.

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