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US 2017/0305033 A1Published application
Method for scavenging free formaldehyde using multifunctional scavenger for wooden composite products with urea-formaldehyde resin
AssigneeFPInnovations
InventorsYaolin ZHANG, Xiang-Ming WANG, Zhenhua GAO
Life of this patent
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Abstract
The application describes a method of scavenging formaldehyde from a wooden composite comprising urea-formaldehyde or melamine urea-formaldehyde by providing a combination of formaldehyde scavengers in the face and core layers of the composite and further describes the composite produced with these scavengers.
Claims8
A method of scavenging formaldehyde from a wooden composite comprising urea-formaldehyde or melamine urea-formaldehyde, the method comprising:
- providing a furnish for at least one of a core layer and a face layer,
- providing at least one of a first formaldehyde scavenger (FS-C) and a second formaldehyde scavenger (FS-F);
- wherein the first formaldehyde scavenger (FS-C) is at least one group selected from the group consisting of K2S2O8, (NH4)2S2O8, and Na2S2O3, and optionally comprising ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2SOPO4, (NH4)2CO, (NH4)2SO4 and combinations thereof;
- wherein the second formaldehyde scavenger (FS-F) comprises at least (NH4)2CO and [(NH4)2OH.HCl] and optionally comprises K2S2O8, (NH4)2S2O8, Na2S2O8, ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2HPO4, (NH4)2SO4, and combinations thereof;
- providing an urea-formaldehyde uncured resin or a melamine urea-formaldehyde uncured resin, wherein each uncured resin comprises an adhesive and a catalyst;
- mixing at least one of the following combinations
- i) the first formaldehyde scavenger (FS C), the uncured resin and the furnish of the core layer;
- ii) the second formaldehyde scavenger (FS F), the uncured resin and the furnish of the face layer;
- iii) the first formaldehyde scavenger (FS-C), the uncured resin and the furnish of the face layer;
- and
- iv) the second formaldehyde scavenger (FS-F), the uncured resin and the furnish of the core layer,
- producing at least one core layer having two sides from any one of i), ii), iii) and iv) combinations;
- applying at least one face layer on each of the sides of the core layer from any one of i), ii), iii) and iv) combinations;
- curing the core layer and the two face layers,
- the solid weight of formaldehyde scavenger (FS F) is 15 to 20 wt % of he total weight solids of resin in the face layer,
- whereby scavenging formaldehyde from the wooden composite.
13 more elements
(canceled)
A method of scavenging formaldehyde from a wooden composite comprising urea-formaldehyde or melamine urea-formaldehyde resin,
- providing a furnish for at least one of a core layer and a face layer , the method comprising:
- providing at least one of a first formaldehyde scavenger (FS-C) and a second formaldehyde scavenger (FS-F);
- wherein the first formaldehyde scavenger (FS-C) is at least one group selected from the group consisting of K2S2O8, (NH4)2S2O8, and Na2S2O8, and optionally comprising ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2HPO4, (NH4)2CO, (NH4)2SO4 and combinations thereof;
- wherein the second formaldehyde scavenger (FS-F) comprises at least (NH4)2CO and [(NH4)2OH.HCl] and optionally comprises K2S2O8, (NH4)2SO8, Na2S2O8, ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2HPO4, (NH4)2SO4, and combinations thereof;
- providing an urea-formaldehyde uncured resin or a melamine urea-formaldehyde uncured resin;
- mixing at least one of the following
- i) the first formaldehyde scavenger (FS C), the uncured resin and the furnish of the core layer;
- and
- ii) the second formaldehyde scavenger (FS F), the uncured resin and the furnish of the face layer;
- producing at least one core layer from i) the core layer having two sides;
- applying a face layer on each of the sides of the core layer from ii);
- curing the core layer and the two face layers,
- whereby scavenging formaldehyde from the wooden composite.
10 more elements
A wooden composite comprising
- at least one of a core layer having two sides,
- at least one face layer on each of the sides of the core layer,
- wherein each of the core layer and the face layers comprise:
- a urea-formaldehyde or melamine urea-formaldehyde resin, the resin comprising an adhesive and catalyst,
- wherein the at least on core layer further comprises a core furnish and a first formaldehyde scavenger, and each face layer further comprising a face furnish and a second formaldehyde scavenger,
- wherein the first formaldehyde scavenger (FS-C) is at least one group selected from the group consisting of K2S2O8, (NH4)2S2O8, and Na2S2O8, and optionally comprising ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2HPO4, (NH4)2CO, (NH4)2SO4 and combinations thereof;
- wherein the second formaldehyde scavenger (FS-F) comprises at least (NH4)2CO and [(NH4)2OH HCl] and optionally comprises K2S2O8, (NH4)2S2O8, Na2S2O8, ammonium polyphosphate (NH4)3PO4, NH4H2PO4, (NH4)2HPO4, (NH4)2SO4, and combinations thereof.
4 more elements
Dependencies are inferred from the claim text.