Section VI Corporate Standard for Cold High-strength and Quick-drying Starch Adhesives

1 Scope This standard specifies the technical requirements, test methods, inspection rules, markings, packaging, and storage of cold high-strength and quick-drying starch adhesives.
This standard is applicable to cold high-strength and quick-drying starch adhesives used for cartons bonding, which is prepared by oxidizing, gelatinizing and bringing together starch as a main ingredient. (hereinafter referred to as adhesive)
2 Citation Criteria The clauses contained in the following standards are quoted by this standard and constitute the provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.
GB84472-84 Determination of density and relative density of chemical products GB1723-79 Viscosity determination of coatings GB 6548 Method for determination of adhesive strength of corrugated cardboard GB6546 Method for determination of edge pressure strength of corrugated cardboard GB 650 5 Determination of burst strength of corrugated cardboard GB190-90 Packaging and transportation logo symbol GB3723-83 Safety standard for sampling of industrial chemical products GB6544 Corrugated cardboard GB601-88 Chemical reagent titration analysis (capacity analysis) standard solution preparation.
Preparation of preparations and products used in GB602-88 chemical reagent test methods 3 Technical requirements 3.1 Appearance properties White to brown translucent viscous liquid. No mechanical impurities.
3.2 physical and chemical indicators see Table 1
Table 1

project

index

Total alkali content, calculated as NaOH, %≤

1.8

Viscosity,S

40±10

Density g/nl

1.04-1.09

.3 Bonding Performance Table 2

Item Index Adhesion speed Initial viscosity, min ≤ 2.0 Full viscosity, min ≤ 15 Destruction of fiber, S ≤ 60 Adhesion strength, N/cm2 ≥ 6 Adhesion strength, N/m Conforms to the specified burst strength in Table 5 of GB6544, KPa compliance Table 5 of GB6544

Note: The raw materials used for corrugated paper should meet the requirements of GB6544 No. 1.3.1.
3.4 Adhesive used corrugated board The amount of adhesive used for the three-layer corrugated board is not more than 120g per square meter.
4 Test methods 4.1 Inspection of appearance with sensory test 4.2 Test of physical and chemical indicators 4.2.1 Determination of total alkali amount 4.2.1.1 Raw volume:
The binder was titrated with a hydrochloric acid standard solution using phenolphthalein as an indicator, and the solution changed from red to colorless as the end point.
4.2.1.2 Reagents and solutions a. Phenolphthalein indicator, 10g/L prepared according to GB603.
b. Hydrochloric acid standard solution, c(Hcl) = 0.5 moI/L.
4.2.1.3 Test procedure Take sample 10g, (accuracy 0.0002g) set 25ml flask, add 100ml distilled water, drop 5 drops of phenolphthalein indicator, shake, with hydrochloric acid standard solution to the end of the disappearance of red, with x% The total alkali amount is calculated according to Formula 1.
x%=cv0.0400/m×100......
Where c-salt ester standard solution concentration, moI/L.
The volume of hydrochloric acid standard solution was consumed in v-titration, ml.
M-sample quality, g.
0.0400 - The mass of sodium hydroxide per ml of hydrochloric acid, g.
4.2.2 Determination of density According to the provisions of GB4472 4.2.3 Determination of viscosity According to GB1723 Tu-4 viscometer law provisions.
4.2.4 Determination of bonding time 4.2.4.1 Glued cardboard Take over 250g/m2 of cardboard paper for veneer paper, cut into 50mm wide, 1000mm long paper, take high-strength corrugated cardboard 180g/m2 cut to a width of 50mm, A 1300 mm long paper strip was processed to a width of 50 mm long and 1000 mm wide corrugated cardboard at a carton production scale according to a 30% shrinkage rate. The adhesive was then applied at a dose of no more than 120 g per 1 m 2 , and then the adhesion speed was measured.
4.2.4.2 Determination of Time of Destruction of Fibers Cardboard coating adhesives are timed with a stopwatch. After 20 seconds, they are peeled off by hand. Each time 5S is peeled off, each peeling is performed one time, and each peeling length is 50mm. When it is time to destroy the fiber.
4.2.4.3 Determination of initial tack time After the fiber to be bonded is destroyed by the fiber, it is peeled once every 10 seconds and each time is stripped to a length of 50mm. The tackiness of the place to be bonded is all from the time required to bond the cardboard to the required time.
4.2.4.4 Determination of the total sticking time After the initial sticking, continue to peel, strip once every 1min, each time 50mm, until the adhesive is completely bonded, and do not open the adhesive from the adhesive cardboard to the time required at this time, that is, the whole Sticky time.
4.3 Adhesion performance test 4.3.1 Bond strength test According to GB6548 regulations 4.3.2 Side pressure strength test According to GB6546 regulations 4.3.3 Break strength test According to GB6545 regulations 4.4 The amount of adhesive used First Weigh the 2m2 corrugated paperboard on the scale with 5g weight, then adjust the time on the equipment, start weighing the glue immediately after glueing, calculate the usage (X), g/m2 Formula 2 calculation.
X=m2-m1/S
Where: m2-total mass after bonding, g;
M1 - mass before bonding, g;
S-corrugated board area, m2.
5 Inspection Rules 5.1 The adhesive must be inspected by the manufacturer's quality inspection department and attached with the certificate before leaving the factory.
5.2 factory inspection for appearance properties, viscosity.
5.3 type test is the entire content of this standard.
5.4 Type test should be carried out in one of the following situations:
a. timing of new product test development;
b. Normal production no less than once a year;
c. When production is suspended for one year and resumed production;
d. When there are major changes in the raw materials and processes of the products, which may affect the quality of the products;
e. When there is a significant difference between the factory inspection and the last type inspection result;
f. When the quality supervision department puts forward the type inspection requirements.
5.5 The same feed is a batch.
5.6 The sample is randomly sampled, the total sample size is not less than 1kg, and the average sample is tested after uniform mixing. Store in a jar with a ground cover.
5.7 Sampling quantity according to Table 3

Number of containers Sample number 10-30 3 31-64 4 65-125 5

5.8 sampling should be implemented according to the relevant provisions of GB3723.
5.9 Inspection results If one of the inspection results does not comply with the requirements of this standard, double sampling shall be performed from the product, and the re-inspection shall be conducted for the unqualified items. If there is still one unqualified item, the batch of adhesive shall be judged to be unqualified.
6 signs, packaging, transport and storage 6.1 logo adhesive packaging should be marked product name, factory name, site, net quality, implementation of standards, production date, shelf life, the main ingredients. And should have the provisions of GB190.
6.2 Transportation, storage Storage and transportation should be covered with canopy, rainproof, sunscreen, antifreeze, and the shelf life is half a month.