PU foam and manufacturing method thereof

Abstract

The invention discloses a PU foam. The PU foam comprises a PET bottom lining film layer, a PU foam layer and a transparent single-sided release film protective layer which are sequentially arranged from top to bottom; and the PU foam layer is formed by mixing 90-98 parts of a PU adhesive, 0.5-3.5 parts of foam glass bead fine powder, 0.1-1.5 parts of a curing agent and 0.1-1.0 part of an antioxidant. The PU foam has the following advantages: (1) air hole foaming is performed to achieve a closed hole state, the sizes of all holes are consistent, and the distances among the holes are very average, the waterproof and shockproof functions are achieved, and the hardness and the foaming ratio can be adjusted; (2) the production is very convenient, pre-foaming and additional processing are not needed, and the production can be completed by mixing and stirring the adhesive and the related resin and then coating; and (3) with the PU foam is cheaper and more environment-friendly than acrylic foam, PO foam and poron foam with the same functions.

Description

Technical field

[0001] The invention relates to the field of PU films, in particular to a PU foam and a manufacturing method thereof. Background technique

[0002] The technology is constantly updated and developed, especially in the IT industry, which requires miniaturization, ultra-thin, shock-proof and so on. PU foam double-sided tape not only has excellent sealing performance, good resilience, strong adhesion, good stickiness, and water resistance. , Good hardness, good toughness and strong weight resistance, and has the advantages of heat preservation, heat insulation, sound absorption, shock absorption, flame retardant, anti-static, and good air permeability. Therefore, it is used in household appliances, instrumentation, automobile industry, and battery industry. And other fields have good application prospects.

[0003] However, the current PU foam needs to be pre-foamed, which is complicated to process and high in cost, and the pre-foamed pores are uneven, shockproof and ...

Examples

Embodiment 1

[0025] The PU foam provided by the present invention comprises a PET backing film layer 1, a PU foam layer 2 and a transparent single-sided release film protective layer 3 arranged in sequence from top to bottom; the PU foam layer 2 is made of PU adhesive, foamed glass bead powder, curing agent and antioxidant are mixed, wherein the PU adhesive is 96 parts; the foamed glass bead powder is 3 parts; the curing agent is 0.5 part; the antioxidant is 0.5 part.

[0026] The preparation method of processed foam is as follows:

[0027] Add the foamed glass bead powder of the weighed material to the stirring PU binder and stir it evenly, and the time is 20-40min to obtain the first mixture;

[0028] Filter the first mixture material with a 250-350 mesh filter;

[0029] After weighing the filtered first mixture, add it to the weighed and stirred PU binder and at the same time add the antioxidant, and stir at 300-400r / min for 20-40min to obtain the second mixture;

[0030] Add the weighed materi...

Embodiment 2

[0035] The PU foam provided by the present invention comprises a PET backing film layer 1, a PU foam layer 2 and a transparent single-sided release film protective layer 3 arranged in sequence from top to bottom; the PU foam layer 2 is made of PU adhesive, foamed glass bead powder, curing agent and antioxidant are mixed, wherein the PU adhesive is 95 parts; the foamed glass bead powder is 3 parts; the curing agent is 1 part; the antioxidant is 1 part.

[0036] The preparation method of processed foam is as follows:

[0037] Add the foamed glass bead powder of the weighed material to the stirring PU binder and stir it evenly, and the time is 20-40min to obtain the first mixture;

[0038] Filter the first mixture material with a 250-350 mesh filter;

[0039] After weighing the filtered first mixture, add it to the weighed and stirred PU binder and at the same time add the antioxidant, and stir at 300-400r / min for 20-40min to obtain the second mixture;

[0040] Add the weighed material c...

Technical field

[0001] The invention relates to the field of PU films, in particular to a PU foam and a manufacturing method thereof. Background technique

[0002] The technology is constantly updated and developed, especially in the IT industry, which requires miniaturization, ultra-thin, shock-proof and so on. PU foam double-sided tape not only has excellent sealing performance, good resilience, strong adhesion, good stickiness, and water resistance. , Good hardness, good toughness and strong weight resistance, and has the advantages of heat preservation, heat insulation, sound absorption, shock absorption, flame retardant, anti-static, and good air permeability. Therefore, it is used in household appliances, instrumentation, automobile industry, and battery industry. And other fields have good application prospects.

[0003] However, the current PU foam needs to be pre-foamed, which is complicated to process and high in cost, and the pre-foamed pores are uneven, shockproof and ...

Examples

Embodiment 1

[0025] The PU foam provided by the present invention comprises a PET backing film layer 1, a PU foam layer 2 and a transparent single-sided release film protective layer 3 arranged in sequence from top to bottom; the PU foam layer 2 is made of PU adhesive, foamed glass bead powder, curing agent and antioxidant are mixed, wherein the PU adhesive is 96 parts; the foamed glass bead powder is 3 parts; the curing agent is 0.5 part; the antioxidant is 0.5 part.

[0026] The preparation method of processed foam is as follows:

[0027] Add the foamed glass bead powder of the weighed material to the stirring PU binder and stir it evenly, and the time is 20-40min to obtain the first mixture;

[0028] Filter the first mixture material with a 250-350 mesh filter;

[0029] After weighing the filtered first mixture, add it to the weighed and stirred PU binder and at the same time add the antioxidant, and stir at 300-400r / min for 20-40min to obtain the second mixture;

[0030] Add the weighed materi...

Embodiment 2

[0035] The PU foam provided by the present invention comprises a PET backing film layer 1, a PU foam layer 2 and a transparent single-sided release film protective layer 3 arranged in sequence from top to bottom; the PU foam layer 2 is made of PU adhesive, foamed glass bead powder, curing agent and antioxidant are mixed, wherein the PU adhesive is 95 parts; the foamed glass bead powder is 3 parts; the curing agent is 1 part; the antioxidant is 1 part.

[0036] The preparation method of processed foam is as follows:

[0037] Add the foamed glass bead powder of the weighed material to the stirring PU binder and stir it evenly, and the time is 20-40min to obtain the first mixture;

[0038] Filter the first mixture material with a 250-350 mesh filter;

[0039] After weighing the filtered first mixture, add it to the weighed and stirred PU binder and at the same time add the antioxidant, and stir at 300-400r / min for 20-40min to obtain the second mixture;

[0040] Add the weighed material c...

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